Trailing-Edge
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PDP-10 Archives
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BB-H311D-RM
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monitor-sources/sched.mac
There are 52 other files named sched.mac in the archive. Click here to see a list.
; UPD ID= 5072, SNARK:<6.MONITOR>SCHED.MAC.153, 7-Nov-84 18:44:38 by MOSER
;MORE 6.2245 - REARRANGE SKDSHK TABLE - SPEED UP APSKED
; UPD ID= 5016, SNARK:<6.MONITOR>SCHED.MAC.152, 26-Oct-84 10:58:51 by LEACHE
;Add code (under EHLJSB conditional) for extended JSB
; UPD ID= 5005, SNARK:<6.MONITOR>SCHED.MAC.151, 25-Oct-84 07:25:31 by GRANT
;In SWHLT, stop the KLIPA
; UPD ID= 4978, SNARK:<6.MONITOR>SCHED.MAC.150, 22-Oct-84 16:32:32 by GRANT
;Remove references to FTCI
; UPD ID= 4952, SNARK:<6.MONITOR>SCHED.MAC.149, 18-Oct-84 14:35:40 by MOSER
;TCO 6.2245 - MAKE SCHEDULER WASTE LESS TIME IN SKDJOB
;CORRECT ACCOUNTING OF LAST THROES AT HLTFK2
;REWRITE NEWST FOR BETTER RESPONSE
; UPD ID= 4910, SNARK:<6.MONITOR>SCHED.MAC.148, 10-Oct-84 15:50:18 by GLINDELL
;TCO 6.2241 - Call SETPSK before deleting user UPT in HLTFK2
; UPD ID= 4833, SNARK:<6.MONITOR>SCHED.MAC.147, 17-Sep-84 11:22:07 by PURRETTA
;Update copyright notice
; UPD ID= 4772, SNARK:<6.MONITOR>SCHED.MAC.146, 29-Aug-84 13:57:53 by TGRADY
;TCO 6.2202 (QAR 706091) Fix DEBRK code to ERJMP after UMOVE to prevent
; ILMNRF's from extended section user programs.
; UPD ID= 4619, SNARK:<6.MONITOR>SCHED.MAC.145, 28-Jul-84 15:54:17 by MOSER
;TCO 6.2083 - ENHANCE MONBK FACILITY
; UPD ID= 4508, SNARK:<6.MONITOR>SCHED.MAC.144, 12-Jul-84 21:56:44 by TGRADY
;TCO 6.2126 Use Global job number in GETOK% .GOCLS function
; UPD ID= 4336, SNARK:<6.MONITOR>SCHED.MAC.143, 13-Jun-84 21:42:16 by MOSER
;TCO 6.2037 - ADD BLOCKE - GO ECSKED AND BLOCK NOT IBS
; UPD ID= 4324, SNARK:<6.MONITOR>SCHED.MAC.142, 12-Jun-84 13:27:31 by MOSER
;TCO 6.2086 - FIX SHROFN UNMAP INDEX FILE
; UPD ID= 4147, SNARK:<6.MONITOR>SCHED.MAC.141, 26-Apr-84 14:00:47 by MCINTEE
;Change a CAMN to a CAME in SKDRTJ.
; UPD ID= 4091, SNARK:<6.MONITOR>SCHED.MAC.140, 17-Apr-84 16:07:14 by PAETZOLD
;More TCO 6.2032 - Change a TXZE to a TXNE in PIRQ to avoid reseting FKSTA2
; UPD ID= 4083, SNARK:<6.MONITOR>SCHED.MAC.139, 12-Apr-84 15:53:25 by TGRADY
;TCO 6.2032 - Set batch jobs in the dregs using global job number, not local.
; UPD ID= 4064, SNARK:<6.MONITOR>SCHED.MAC.138, 11-Apr-84 15:55:38 by PAETZOLD
;TCO 6.2020 - Save FKSTA2 in PIRQ and restore it in PIRQR.
; UPD ID= 3804, SNARK:<6.MONITOR>SCHED.MAC.137, 29-Feb-84 01:44:52 by TGRADY
;IMPLEMENT GLOBAL JOB NUMBERS
; -IN .TWAKE, CONVERT USER-SUPPLIED JOB NUMBER FROM GLOBAL TO LOCAL.
; -IN SKDRTJ (.SKED), CONVERT USER-SUPPLIED JOB NUMBER FROM GLOBAL TO LOCAL
; -SAME THING FOR SKDSJC...
; UPD ID= 3731, SNARK:<6.MONITOR>SCHED.MAC.136, 22-Feb-84 14:00:35 by MOSER
;TCO 6.1562 CALL SERVER IF REQUESTED IN SHORT CYCLE. REMEMBER IF WE ARE IN
; NULL JOB.
; UPD ID= 3731, SNARK:<6.MONITOR>SCHED.MAC.136, 22-Feb-84 14:00:35 by MOSER
;TCO 6.1562 CALL SERVER IF REQUESTED IN SHORT CYCLE. REMEMBER IF WE ARE IN
; NULL JOB.
; UPD ID= 3637, SNARK:<6.MONITOR>SCHED.MAC.135, 1-Feb-84 22:10:26 by MURPHY
;More 6.1525 - Make JSYSes from monitor sections .G. 1 work.
; UPD ID= 3587, SNARK:<6.MONITOR>SCHED.MAC.134, 29-Jan-84 12:11:16 by PAETZOLD
;More TCO 6.1954 - Fix day one J0NRUN and NODDMP bug.
; UPD ID= 3559, SNARK:<6.MONITOR>SCHED.MAC.133, 26-Jan-84 13:58:04 by PAETZOLD
;More TCO 6.1954 - Determine new CHKTIM and DDPTIM in NOCHKR and NODDMP code.
; UPD ID= 3540, SNARK:<6.MONITOR>SCHED.MAC.132, 25-Jan-84 15:15:28 by PAETZOLD
;TCO 6.1954 - Rework NODDMP and NOCHKR code. Add DDMPNR and CHKRNR BUGHLTs.
; UPD ID= 3514, SNARK:<6.MONITOR>SCHED.MAC.131, 23-Jan-84 15:16:22 by MOSER
;TCO 6.1910 - ALLOW -1 IN PATADR
; UPD ID= 3450, SNARK:<6.MONITOR>SCHED.MAC.130, 12-Jan-84 15:07:45 by PAETZOLD
;TCO 6.1927 - Zero out FKPGS in HLTFK1
; UPD ID= 3446, SNARK:<6.MONITOR>SCHED.MAC.129, 12-Jan-84 14:20:26 by PAETZOLD
;TCO 6.1929 - Change FKJOBN to FKJBN
; UPD ID= 3308, SNARK:<6.MONITOR>SCHED.MAC.128, 13-Dec-83 18:15:00 by PAETZOLD
;TCO 6.1906 - Change J0NRUN to NOCHKR and add NODDMP BUGHLT.
; UPD ID= 3297, SNARK:<6.MONITOR>SCHED.MAC.127, 12-Dec-83 15:58:13 by LOMARTIRE
;TCO 6.1860 - Clear all non-zero sections during logout to prevent hanging
; UPD ID= 3268, SNARK:<6.MONITOR>SCHED.MAC.126, 6-Dec-83 17:33:04 by MOSER
;TCO 6.1827 - PREVENT ILMNRF DURING FORK CREATION
; UPD ID= 3257, SNARK:<6.MONITOR>SCHED.MAC.125, 6-Dec-83 09:22:56 by MOSER
;TCO 6.1825 - MAKE JP%SYS FORKS IMUNE FROM WINDFALL WITHHELD
; UPD ID= 3056, SNARK:<6.MONITOR>SCHED.MAC.124, 21-Oct-83 19:30:51 by MURPHY
;Get JOBNO initialized in FKSET so UCLOCK not confused.
; UPD ID= 2987, SNARK:<6.MONITOR>SCHED.MAC.123, 5-Oct-83 14:08:04 by MURPHY
;TCO 6.1815 - Fix old bugs in .DISMS and SCHEDJ.
; UPD ID= 2864, SNARK:<6.MONITOR>SCHED.MAC.122, 23-Aug-83 15:42:50 by LOMARTIRE
;TCO 6.1767 - Fix .SKBCS function of SKED to loop through all batch jobs
; UPD ID= 2832, SNARK:<6.MONITOR>SCHED.MAC.121, 16-Aug-83 12:03:57 by TGRADY
;TCO 6.1689 - Put JTDEQ back the way it was until the fork tables are completed
; UPD ID= 2800, SNARK:<6.MONITOR>SCHED.MAC.120, 4-Aug-83 00:33:09 by LEACHE
;TCO 6.1737 Add crash-on-fork facility
; UPD ID= 2771, SNARK:<6.MONITOR>SCHED.MAC.119, 27-Jul-83 11:45:24 by MURPHY
;Ditto
; UPD ID= 2766, SNARK:<6.MONITOR>SCHED.MAC.118, 25-Jul-83 17:12:34 by MURPHY
;TCO 6.1751 - SKDJFC - Don't use FX as aobjn pointer.
; UPD ID= 2705, SNARK:<6.MONITOR>SCHED.MAC.117, 19-Jul-83 08:39:26 by MILLER
;TCO 6.1689. Fix JTDEQ not to cause ILMNRF
; UPD ID= 2685, SNARK:<6.MONITOR>SCHED.MAC.116, 7-Jul-83 06:38:03 by HALL
;TCO 6.1689 - Move fork tables to extended section
; Use DEFSTRs for fork tables
; UPD ID= 2650, SNARK:<6.MONITOR>SCHED.MAC.115, 1-Jul-83 15:22:16 by TAMBURRI
;TCO 6.1712 Remember and use the section number of the current PA1050
; UPD ID= 2638, SNARK:<6.MONITOR>SCHED.MAC.114, 27-Jun-83 16:17:30 by CHALL
;TCO 6.1673 Make FKTMI global
; UPD ID= 2623, SNARK:<6.MONITOR>SCHED.MAC.113, 21-Jun-83 19:38:06 by PAETZOLD
;TCO 6.1669 - Get rid of HPSCHKs for now.
; UPD ID= 2552, SNARK:<6.MONITOR>SCHED.MAC.112, 2-Jun-83 22:26:54 by MURPHY
;More - must have EA.ENTs in routines called from outside.
; UPD ID= 2547, SNARK:<6.MONITOR>SCHED.MAC.111, 31-May-83 16:46:14 by MURPHY
;More 6.1525 - Move class sched data to extended section.
; UPD ID= 2486, SNARK:<6.MONITOR>SCHED.MAC.110, 18-May-83 11:51:49 by MURPHY
;TCO 6.1660 - Remove RTMIN, RTMAX stuff in AJBALS.
; UPD ID= 2423, SNARK:<6.MONITOR>SCHED.MAC.108, 5-May-83 13:56:54 by RIZZOLO
; Change .DEBRK:+5/SETPCS [MSEC1,,0] to be an AC.
; UPD ID= 2422, SNARK:<6.MONITOR>SCHED.MAC.107, 5-May-83 11:16:04 by MURPHY
;More 6.1635 - Make sure environment right at PSII.
; UPD ID= 2410, SNARK:<6.MONITOR>SCHED.MAC.106, 3-May-83 16:11:51 by COBB
;TCO 6.1639 - ?s in PRINTX messages...
; UPD ID= 2386, SNARK:<6.MONITOR>SCHED.MAC.105, 29-Apr-83 15:18:13 by MCINTEE
;TCO 6.1630 - Change MONBK/PSIMB
; UPD ID= 2372, SNARK:<6.MONITOR>SCHED.MAC.104, 29-Apr-83 14:22:46 by MURPHY
;TCO 6.1635 -Use MONENV instead of MONFLG to include PCU and PCS values.
; UPD ID= 2370, SNARK:<6.MONITOR>SCHED.MAC.102, 28-Apr-83 17:12:34 by MURPHY
;Fix bug in UPD ID 1791 - PCS must be exactly 1 in DEBRK so BLT works.
; UPD ID= 2341, SNARK:<6.MONITOR>SCHED.MAC.101, 25-Apr-83 20:12:14 by MCLEAN
;TCO 6.1624. UU1050 HAS PCU IN PC WORD
; UPD ID= 2269, SNARK:<6.MONITOR>SCHED.MAC.100, 13-Apr-83 13:02:18 by MILLER
;Conce more on the previous edit
; UPD ID= 2268, SNARK:<6.MONITOR>SCHED.MAC.99, 13-Apr-83 12:49:06 by MILLER
;TCO 6.1610. Call CFONLT when requested
; UPD ID= 2259, SNARK:<6.MONITOR>SCHED.MAC.98, 13-Apr-83 08:43:50 by MCINTEE
;stray character
; UPD ID= 2257, SNARK:<6.MONITOR>SCHED.MAC.97, 13-Apr-83 08:31:13 by MCINTEE
;Remove the last occurrence of FTNSPSRV
; UPD ID= 2244, SNARK:<6.MONITOR>SCHED.MAC.96, 12-Apr-83 13:14:48 by MCINTEE
;Remove IFNDEF FTNSPSRV
; UPD ID= 2123, SNARK:<6.MONITOR>SCHED.MAC.95, 31-Mar-83 15:52:21 by HALL
;TCO 6.1502 - Allow free space in extended sections
; Added an EA.ENT to SAVRT to cover its call to UCLOCK
; UPD ID= 2105, SNARK:<6.MONITOR>SCHED.MAC.94, 28-Mar-83 17:46:51 by MURPHY
;Remove MONPC and MONFL no longer used.
; UPD ID= 2011, SNARK:<6.MONITOR>SCHED.MAC.93, 16-Mar-83 14:14:22 by MOSER
;TCO 6.1375 - PREVENT JOBS STUCK ON DREGS QUEUE AFTER REMOVAL
; UPD ID= 1962, SNARK:<6.MONITOR>SCHED.MAC.91, 10-Mar-83 15:07:10 by MURPHY
;Handle second PSB page consistently with first. Change name to FKPS2.
; UPD ID= 1936, SNARK:<6.MONITOR>SCHED.MAC.90, 7-Mar-83 23:19:49 by CDUNN
;MORE TCO 6.1127 - Make SCS% JSYS locs in PSB external (for now) to clean up
;compile and syms end up in GLOBS.
; UPD ID= 1933, SNARK:<6.MONITOR>SCHED.MAC.89, 7-Mar-83 22:40:50 by CDUNN
;More TCO 6.1127 - Make PSITR1 global such that SCSPSI: (in SCSJSY)
;can return there.
; UPD ID= 1925, SNARK:<6.MONITOR>SCHED.MAC.88, 7-Mar-83 20:44:07 by CDUNN
;Make default monitor load KLIPA code
; UPD ID= 1915, SNARK:<6.MONITOR>SCHED.MAC.87, 3-Mar-83 14:24:30 by CDUNN
;More TCO 6.1127 - Add code to PIRQ to take entries off SCS% work Q and place
;on fork and CB queues for user mode SYSAP.
; UPD ID= 1881, SNARK:<6.MONITOR>SCHED.MAC.86, 27-Feb-83 22:07:09 by MURPHY
;Revise 6.1514 - Add ERJMPS and ERCALS handling. ERJMPR and ERCALR too.
; UPD ID= 1851, SNARK:<6.MONITOR>SCHED.MAC.85, 22-Feb-83 08:47:17 by LEAPLINE
;Remove conditional for KLNI. Call has been added to LV8CHK.
; UPD ID= 1849, SNARK:<6.MONITOR>SCHED.MAC.84, 21-Feb-83 17:22:19 by MURPHY
;Refine previous edit a bit.
; UPD ID= 1846, SNARK:<6.MONITOR>SCHED.MAC.83, 21-Feb-83 00:45:14 by MURPHY
;TCO 6.1517 - ITRSIM handle interal call.
; UPD ID= 1837, SNARK:<6.MONITOR>SCHED.MAC.82, 20-Feb-83 20:25:08 by MURPHY
;TCO 6.1514 - Don't clobber user AC1 if taking ERJMP/ERCAL.
;More 6.1472 - Adjust mousetraps in MENTR, etc.
; UPD ID= 1791, SNARK:<6.MONITOR>SCHED.MAC.81, 11-Feb-83 16:45:52 by MURPHY
;TCO 6.1472 - Don't clear CRSKED in ITRAP.
; Revise BUGHLTs and BUGCHKs in ITRAP; require ERJMP after nested JSYS calls.
; UPD ID= 1639, SNARK:<6.MONITOR>SCHED.MAC.80, 11-Jan-83 15:19:27 by MCINTEE
;Remove edits 1609,1616,1620 - do it in SCJSYS
; UPD ID= 1631, SNARK:<6.MONITOR>SCHED.MAC.79, 7-Jan-83 15:53:25 by MURPHY
;TCO 6.1447 - More settable scheduler parameters
; UPD ID= 1620, SNARK:<6.MONITOR>SCHED.MAC.78, 5-Jan-83 20:20:31 by NICHOLS
;Typo in previous edit, again
; UPD ID= 1616, SNARK:<6.MONITOR>SCHED.MAC.77, 4-Jan-83 13:46:11 by MCINTEE
;Typo in previous edit.
; UPD ID= 1609, SNARK:<6.MONITOR>SCHED.MAC.76, 3-Jan-83 09:01:53 by MCINTEE
;Add code to PDBK1 to avoid losing SCJSYS wakeups. (under IFE FTNSPSRV)
; UPD ID= 1583, SNARK:<6.MONITOR>SCHED.MAC.75, 27-Dec-82 17:49:11 by LEAPLINE
;Add KLNI scheduler test.
; UPD ID= 1564, SNARK:<6.MONITOR>SCHED.MAC.74, 22-Dec-82 12:58:38 by MCINTEE
;Change PSIRQ's NOSKED to check for PI in progress.
; UPD ID= 1563, SNARK:<6.MONITOR>SCHED.MAC.73, 22-Dec-82 07:36:44 by MCINTEE
;MORE TCO 6.1391 - MAKE ILUUO1 A GLOBAL !! SINCE IT IS IN GLOBS
; UPD ID= 1560, SNARK:<6.MONITOR>SCHED.MAC.72, 21-Dec-82 15:39:22 by MOSER
;TCO 6.1391 - NEW ENTRY FOR ILUUO IF ALREADY IN JSYS CONTEXT
; UPD ID= 1542, SNARK:<6.MONITOR>SCHED.MAC.70, 20-Dec-82 19:26:03 by NICHOLS
;Move DECnet-36 scheduler calls from SCHED to STG
;Feature test some more NSPSRV code
; UPD ID= 1540, SNARK:<6.MONITOR>SCHED.MAC.69, 20-Dec-82 17:45:24 by NICHOLS
;Add FTNSPSRV to distinguish between release 6.0 and 6.1
;Change BITWAI to use FORKX instead of requiring caller to pass fork number
; UPD ID= 1532, SNARK:<6.MONITOR>SCHED.MAC.68, 11-Dec-82 17:15:15 by PAETZOLD
;Delete pre release 5 edit history. Update copyright.
; UPD ID= 1531, SNARK:<6.MONITOR>SCHED.MAC.67, 11-Dec-82 17:08:40 by PAETZOLD
;TCO 6.1413 - Add CSKBUG BUGHLT to detect excessive ECSKEDs
; UPD ID= 1346, SNARK:<6.MONITOR>SCHED.MAC.66, 18-Oct-82 12:38:54 by MOSER
;TCO 6.1310 - LOOK AT NBPROC INSTEAD OF NGOJOB WHEN DETERMINING IDLE
; UPD ID= 1337, SNARK:<6.MONITOR>SCHED.MAC.65, 13-Oct-82 18:10:52 by MILLER
;tco 6.1000. PSI code has new conventions for saving and changing PC variables
; UPD ID= 1302, SNARK:<6.MONITOR>SCHED.MAC.64, 8-Oct-82 15:13:19 by MURPHY
;MORE 5.1.1075 - Make bias 11 same as release 4.
; UPD ID= 1223, SNARK:<6.MONITOR>SCHED.MAC.63, 23-Sep-82 18:06:34 by MURPHY
;TCO 6.1280 - Revisions to NEWST.
; UPD ID= 1168, SNARK:<6.MONITOR>SCHED.MAC.62, 13-Sep-82 12:53:11 by MOSER
;TCO 6.1246 - PREVENT ILMNRF WHEN JSYS TRAPPING
; UPD ID= 1163, SNARK:<6.MONITOR>SCHED.MAC.61, 10-Sep-82 14:56:54 by MILLER
;One more time
; UPD ID= 1160, SNARK:<6.MONITOR>SCHED.MAC.60, 10-Sep-82 13:51:29 by MILLER
;TCO 6.1259. Make PIRLGO force reinit fo stack at FLOGO
; UPD ID= 1109, SNARK:<6.MONITOR>SCHED.MAC.59, 25-Aug-82 08:12:04 by MCINTEE
;TCO 6.1030 - Make BITCLR & BITSET global
; UPD ID= 1102, SNARK:<6.MONITOR>SCHED.MAC.58, 20-Aug-82 13:19:51 by MCINTEE
;TCO 6.1030 - Make SKDLCY & SKDSCY global
; UPD ID= 1099, SNARK:<6.MONITOR>SCHED.MAC.57, 19-Aug-82 14:34:46 by MCINTEE
;TCO 6.1030 - DAP% JSYS - Fix up FKDAP, and calls to it.
; dismiss routine (BITWAI) and scheduler test routines (BITCLR, BITSET)
; UPD ID= 1005, SNARK:<6.MONITOR>SCHED.MAC.56, 27-Jul-82 15:07:38 by COBB
;TCO 6.1193 - Put Call to NBNSB under SKEDSW conditional, make NSBTAB
;bigger (100 decimal words from 20)
; UPD ID= 996, SNARK:<6.MONITOR>SCHED.MAC.55, 19-Jul-82 13:26:33 by MCINTEE
;Typo in previous edit...
; UPD ID= 975, SNARK:<6.MONITOR>SCHED.MAC.54, 6-Jul-82 12:57:24 by MCINTEE
;More TCO 6.1030 - DAP% JSYS - Add routine for DAP action interrupt (FKDAP),
; dismiss routine (BITWAI) and scheduler test routines (BITCLR, BITSET)
; UPD ID= 960, SNARK:<6.MONITOR>SCHED.MAC.53, 24-Jun-82 13:40:24 by HALL
;TCO 6.1000 - Support the 2080
; Use new kind of LDPAC and STPAC in JSYS entry and exit for KC
; UPD ID= 955, SNARK:<6.MONITOR>SCHED.MAC.52, 22-Jun-82 15:55:18 by MURPHY
;More 6.1160 - Replace WATCH tag lost in previous edit.
; UPD ID= 938, SNARK:<6.MONITOR>SCHED.MAC.51, 16-Jun-82 14:14:32 by MURPHY
;More 6.1160 - Discount load average by holding forks.
; UPD ID= 889, SNARK:<6.MONITOR>SCHED.MAC.50, 9-Jun-82 18:27:04 by MURPHY
;More 6.1160
; UPD ID= 887, SNARK:<6.MONITOR>SCHED.MAC.49, 9-Jun-82 16:51:39 by MURPHY
;TCO 6.1147 - Move bugdefs from BUGS.MAC to here and put them in-line.
; UPD ID= 885, SNARK:<6.MONITOR>SCHED.MAC.48, 9-Jun-82 16:29:49 by MURPHY
;TCO 6.1160 - Account IDLE time correctly.
; UPD ID= 881, SNARK:<6.MONITOR>SCHED.MAC.47, 9-Jun-82 15:09:15 by MURPHY
;Fix bug introduced in 6.1125 - NBWT going negative.
; UPD ID= 822, SNARK:<6.MONITOR>SCHED.MAC.46, 3-Jun-82 13:24:05 by HALL
;A few comments in the software interrupt code
; UPD ID= 798, SNARK:<6.MONITOR>SCHED.MAC.45, 29-May-82 16:04:16 by HALL
;TCO 6.1000 - Support the 2080
; Use LDPAC. and STPAC. to save and restore user AC's
; At MENT1, get section number using defstr rather than half-word instruction
; Fix previous edit to ITRAP to diddle P correctly
; UPD ID= 761, SNARK:<6.MONITOR>SCHED.MAC.44, 18-May-82 14:59:45 by HALL
;TCO 6.1000 - Support the 2080
; In PSI code, clean up setting of user context in flags word
; UPD ID= 756, SNARK:<6.MONITOR>SCHED.MAC.43, 15-May-82 13:44:31 by HALL
;TCO 6.1000 - Support the 2080
; MENTU - Make TRAPSI run in section 1
; MENT1 - Set PCS in new flags word
; ITRAP - Save fixed-up stack pointer in MPP for MRETN
; PSIS5 - When returning flag word in LEVTAB, return only the flag bits
; SCDIN - Provide reasonable initial value for INSKED
; DEBRK JSYS - Preserve only flags when comparing new and old flags words,
; set previous context correctly on entry
; JTENQ - Save flags from ENSKR instead of left half of CX
; MRETN - Remove clearing of QUOTAB (appears never to be set)
; UPD ID= 744, SNARK:<6.MONITOR>SCHED.MAC.42, 13-May-82 13:52:03 by HALL
;TCO 6.1000 - Support the 2080
; Move IMCFLG to PROLOG with other bits
; UPD ID= 712, SNARK:<6.MONITOR>SCHED.MAC.41, 9-May-82 14:35:55 by HALL
;TCO 6.1000 - Support the 2080
; Make UUO and RMS entry get op code and AC from the right place
; UPD ID= 705, SNARK:<6.MONITOR>SCHED.MAC.40, 9-May-82 12:59:06 by HALL
;TCO 6.1000 - Support the 2080
; SCDIN - Initialize new flags word in RSKCHK block; Make RSCCHK point
; to section 1
; PISC7 - Set AC blocks only on KL. Check for GOUSR only on KL. Fix new
; flags word for XJEN
; SCHED0 - Change inline XJRSTF to use XJRST; add AC blocks to new
; flags word for starting at PIRQ
; FKSET - Initialize PIPC block new flags word to set AC blocks, do same
; for PIFL, make new flags word include user AC block
; PIRQR - Initialize PFL correctly if going to WFORKA
; PIRSFK - Set AC blocks in PIFL when fork is in JSYS trap queue wait
; PIRLGO - Set AC blocks in PIFL when sending fork to FLOGO
; PSII - At PSIS9, don't clear right half of flags for the KC; at PSIMB,
; set AC blocks in PIFL; at PSISM, set AC blocks in PIFL when
; forcing user mode; at PSIS4 preserve rest of flags word when
; setting PCU and PCS.
; PSISV1 AND PSISV0 - Put DATAO PAG under KL conditional
; DEBRK - Preserve right half of flags word from JSYS entry when returning
; control to the user. Clear right half of flags word when
; comparing with LEVTAB; preserve rest of flags word when setting
; PCU and PCS.
; Add KIMOAC to SAVCT table for the KC
; GOUSR - Put DATAO under KL conditional
; UPD ID= 691, SNARK:<6.MONITOR>SCHED.MAC.39, 5-May-82 00:09:54 by CDUNN
;TCO 6.1127 - Add CISRV asyncronous event simulation code to SKDLV8
; UPD ID= 688, SNARK:<6.MONITOR>SCHED.MAC.38, 4-May-82 18:01:52 by MURPHY
;TCO 6.1125 - Scheduler tests called with CALL instead of JSP.
; UPD ID= 671, SNARK:<6.MONITOR>SCHED.MAC.37, 29-Apr-82 12:31:15 by MURPHY
;Put HPSCHK back in.
; UPD ID= 511, SNARK:<6.MONITOR>SCHED.MAC.36, 16-Mar-82 20:06:34 by PAETZOLD
;TCO 6.1070 - Remove SCTLW definition
; UPD ID= 502, SNARK:<6.MONITOR>SCHED.MAC.35, 15-Mar-82 17:50:08 by COBB
;TCO 5.1754 - CHECK ARGS WHEN SETTING NEW CLASS FOR SKED JSYS
; UPD ID= 405, SNARK:<6.MONITOR>SCHED.MAC.34, 15-Feb-82 16:46:45 by MURPHY
;TCO 5.1730 - Restore lost flags, fix APSKED.
; UPD ID= 371, SNARK:<6.MONITOR>SCHED.MAC.33, 1-Feb-82 19:05:18 by MILLER
;TCO 6.1059. Treat BSCRSK and PIBMP the same as JP%SYS
; UPD ID= 370, SNARK:<6.MONITOR>SCHED.MAC.32, 1-Feb-82 16:02:33 by MILLER
; UPD ID= 368, SNARK:<6.MONITOR>SCHED.MAC.31, 1-Feb-82 13:42:25 by MILLER
;Fix missing ENDIF. in previous edit
; UPD ID= 366, SNARK:<6.MONITOR>SCHED.MAC.30, 1-Feb-82 12:56:38 by MILLER
;TCO 6.1059 AGAIN. Give JP%SYS forks a little less of a boost
; UPD ID= 364, SNARK:<6.MONITOR>SCHED.MAC.29, 30-Jan-82 16:09:41 by HALL
;More on TCO 6.1000 - removing PCU from JSTAB broke JSYS trapping
; UPD ID= 349, SNARK:<6.MONITOR>SCHED.MAC.28, 25-Jan-82 14:02:03 by MILLER
;TCO 6.1059 once more.
; UPD ID= 348, SNARK:<6.MONITOR>SCHED.MAC.27, 25-Jan-82 13:17:09 by MILLER
;TCO 6.1059. CORFCT fixes
; UPD ID= 346, SNARK:<6.MONITOR>SCHED.MAC.26, 24-Jan-82 23:49:52 by MURPHY
;TCO 5.1697 - XSSEV%, etc. Handle extended entry vectors in UU1050, DMSENT.
; UPD ID= 335, SNARK:<6.MONITOR>SCHED.MAC.25, 21-Jan-82 11:57:49 by LEACHE
;For now, turn off HPSCHK - It's polluting CTY and ERROR.SYS
; UPD ID= 326, SNARK:<6.MONITOR>SCHED.MAC.23, 19-Jan-82 15:14:43 by MILLER
;TCO 5.1689. Fix run time guarantee
; UPD ID= 306, SNARK:<6.MONITOR>SCHED.MAC.22, 16-Jan-82 13:52:13 by PAETZOLD
;TCO 5.1680 - fix TCO 5.1658
; UPD ID= 287, SNARK:<6.MONITOR>SCHED.MAC.21, 8-Jan-82 16:40:51 by MURPHY
;TCO 5.1660 - Tags in MENTR, MRETN for JSLOOK program.
; UPD ID= 281, SNARK:<6.MONITOR>SCHED.MAC.20, 7-Jan-82 21:46:22 by PAETZOLD
;TCO 5.1658 - preserve PIFL in carrier off interrupt requests in PIRCOF and PIRLG1
; UPD ID= 213, SNARK:<6.MONITOR>SCHED.MAC.19, 18-Nov-81 17:43:55 by MURPHY
;TCO 5.1615 - MAKE SETPCV INTERNAL
; UPD ID= 208, SNARK:<6.MONITOR>SCHED.MAC.18, 13-Nov-81 13:10:31 by HALL
;TCO 6.1000 - Load full word from JSTAB in IMCLL0 code.
; Clean up some comments
; UPD ID= 187, SNARK:<6.MONITOR>SCHED.MAC.17, 5-Nov-81 17:34:59 by HALL
;TCO 6.1000 - Clean up JSYS entry, necessary for 2080
; Assume JSTAB doesn't contain flags. Microcode sets PCU
; Save some code at MENTM
; UPD ID= 179, SNARK:<6.MONITOR>SCHED.MAC.16, 31-Oct-81 14:43:29 by PAETZOLD
;More TCO 6.1010 - Change CST3 references
; UPD ID= 175, SNARK:<6.MONITOR>SCHED.MAC.15, 30-Oct-81 14:59:36 by MURPHY
;Make HPSCHK less sensitive.
; UPD ID= 158, SNARK:<6.MONITOR>SCHED.MAC.14, 22-Oct-81 16:22:17 by MURPHY
;Ditto
; UPD ID= 157, SNARK:<6.MONITOR>SCHED.MAC.13, 22-Oct-81 11:37:49 by MURPHY
;Fix bug in 5.1428
; UPD ID= 108, SNARK:<6.MONITOR>SCHED.MAC.12, 15-Oct-81 13:29:37 by SCHMITT
;Reinsert TCO 5.1419 but check JOBRT instead of JOBDIR
; UPD ID= 103, SNARK:<6.MONITOR>SCHED.MAC.11, 13-Oct-81 16:19:41 by MURPHY
;Remove TCO 5.1419, ID 51 - it prevented class from being set during LOGIN
; UPD ID= 102, SNARK:<6.MONITOR>SCHED.MAC.10, 13-Oct-81 10:57:44 by MURPHY
;TCO 5.1570 - Fix bug in computation of utilization.
; UPD ID= 96, SNARK:<6.MONITOR>SCHED.MAC.9, 7-Oct-81 14:53:08 by PAETZOLD
;Remove TCO 5.1559 as it caused problems
; UPD ID= 86, SNARK:<6.MONITOR>SCHED.MAC.8, 4-Oct-81 20:23:56 by PAETZOLD
;TCO 5.1559 - Treat NVT's as real TTY's and not as PTY's in NEWST
; UPD ID= 82, SNARK:<6.MONITOR>SCHED.MAC.7, 23-Sep-81 16:25:01 by MURPHY
;TCO 5.1530 - reset local flags in AJBALS
; UPD ID= 72, SNARK:<6.MONITOR>SCHED.MAC.6, 15-Sep-81 16:02:59 by PAETZOLD
;TCO 6.1010 - Move CSTs to CSTSEC - Change CST1 non-mask references
; UPD ID= 63, SNARK:<6.MONITOR>SCHED.MAC.5, 9-Sep-81 17:27:12 by MURPHY
;Get rid of XCT of BUGHLT - make it CALL instead. (REEBUG)
;Revise previous - preserve T3 and T4 in CORFCT
; UPD ID= 55, SNARK:<6.MONITOR>SCHED.MAC.4, 25-Aug-81 09:29:51 by GRANT
;Preserve T3 and T4 over CALL CORFCT in ONGOL
; UPD ID= 50, SNARK:<6.MONITOR>SCHED.MAC.3, 11-Aug-81 14:49:11 by HALL
;Rearrange, comment
; UPD ID= 48, SNARK:<6.MONITOR>SCHED.MAC.2, 10-Aug-81 16:17:52 by HALL
;A little more cleanup
; UPD ID= 45, SNARK:<6.MONITOR>SCHED.MAC.1, 8-Aug-81 13:25:59 by HALL
;TCO 6.1000 - Remove XWD from PISC7
; UPD ID= 95, SNARK:<5.MONITOR>SCHED.MAC.58, 8-Aug-81 09:52:19 by HALL
;Add some comments
; UPD ID= 94, SNARK:<5.MONITOR>SCHED.MAC.57, 7-Aug-81 13:15:19 by SCHMITT
;TCO 5.1439 - Do not perform JSYS trapping on execute only process
; UPD ID= 93, SNARK:<5.MONITOR>SCHED.MAC.56, 7-Aug-81 13:09:43 by SCHMITT
;TCO 5.1440 - Load Job number before compare at HLTJOB
; UPD ID= 91, SNARK:<5.MONITOR>SCHED.MAC.55, 5-Aug-81 11:54:00 by MURPHY
;Ditto
; UPD ID= 64, SNARK:<5.MONITOR>SCHED.MAC.50, 22-Jul-81 17:28:19 by MURPHY
;TCO 5.1428 - Detect excessive time in CSKED, etc.
;Compute job utilization always.
; UPD ID= 52, SNARK:<5.MONITOR>SCHED.MAC.49, 20-Jul-81 15:51:58 by MOSER
;MORE OF TCO 5.1406 SAVE T REGS.
; UPD ID= 51, SNARK:<5.MONITOR>SCHED.MAC.48, 20-Jul-81 10:15:59 by SCHMITT
;Edit 1910 - TCO 5.1419 - Check if job is logged in at CHGCLS
; UPD ID= 48, SNARK:<5.MONITOR>SCHED.MAC.47, 17-Jul-81 16:20:22 by MURPHY
;TCO 5.1398 - HANDLE SKIP RETURN FROM MSETPT
; UPD ID= 16, SNARK:<5.MONITOR>SCHED.MAC.46, 10-Jul-81 09:20:55 by MOSER
;TCO 5.1406 - IF ILLEGAL MEMORY WRITE ON ERCAL RETURN THIS ERROR TO USER.
; UPD ID= 8, SNARK:<5.MONITOR>SCHED.MAC.45, 9-Jul-81 17:13:00 by MURPHY
; TCO 5.1396 - BIT IN JOBBIT TO INDICATE SYSTEM FORK - GETS HIGH PRIORITY
;<5.MONITOR>SCHED.MAC.44, 30-Jun-81 11:23:32, EDIT BY MURPHY
;<5.MONITOR>SCHED.MAC.43, 29-Jun-81 13:45:20, EDIT BY MURPHY
;<5.MONITOR>SCHED.MAC.42, 29-Jun-81 11:58:33, EDIT BY MURPHY
;<5.MONITOR>SCHED.MAC.41, 29-Jun-81 11:43:28, EDIT BY MURPHY
;<5.MONITOR>SCHED.MAC.40, 29-Jun-81 10:55:19, EDIT BY MURPHY
; UPD ID= 2263, SNARK:<5.MONITOR>SCHED.MAC.39, 26-Jun-81 18:06:51 by MURPHY
;MAKE NOSKED/OKSKED EQUIVALENT TO NOSKD1/OKSKD1, SAME FOR CSKED, ETC.
; TCO 5.1376 -
;BAD FLAGS WHEN DEBREAK TO JOBCOF OR FLOGO; NOTE ITRAP WHEN LOGIN/LOGOUT
; UPD ID= 2195, SNARK:<5.MONITOR>SCHED.MAC.38, 12-Jun-81 13:32:16 by MURPHY
;FIX 2168 - NOSKED SHOULD HAVE BEEN NOSKD1, ETC.
; UPD ID= 2188, SNARK:<5.MONITOR>SCHED.MAC.37, 11-Jun-81 15:57:40 by MURPHY
;CHANGE TQNx TO TMNx REFLECTING CHANGE IN MACSYM
; UPD ID= 2168, SNARK:<5.MONITOR>SCHED.MAC.36, 10-Jun-81 15:46:59 by MURPHY
;ELIMINATE SCHEDULER REQUEST QUEUE, CALL FUNCTION IMMEDIATELY
; UPD ID= 2057, SNARK:<5.MONITOR>SCHED.MAC.35, 21-May-81 11:04:35 by SCHMITT
;Tco 5.1339 - Change prioritys of currently active batch jobs at SKDRDQ
; UPD ID= 2045, SNARK:<5.MONITOR>SCHED.MAC.34, 20-May-81 11:51:55 by PAETZOLD
;FIX TYPO IN PREVIOUS
; UPD ID= 2037, SNARK:<5.MONITOR>SCHED.MAC.33, 19-May-81 17:04:10 by PAETZOLD
;TCO 5.1335 DETECT OKSKED'S AND OKSKD1'S WHEN NOT NOSKED
; UPD ID= 1898, SNARK:<5.MONITOR>SCHED.MAC.32, 29-Apr-81 06:29:16 by WACHS
; UPD ID= 1855, SNARK:<5.MONITOR>SCHED.MAC.31, 21-Apr-81 07:02:36 by WACHS
;TCO 5.1290 KEEP KEEP-ALIVE COUNTER GOING ID NOSKED FOR DIAG
; UPD ID= 1707, SNARK:<5.MONITOR>SCHED.MAC.30, 16-Mar-81 11:46:40 by MURPHY
;DITTO
; UPD ID= 1668, SNARK:<5.MONITOR>SCHED.MAC.29, 11-Mar-81 17:13:23 by MURPHY
;MODIFY ENTSKD TO CHECK FOR RECURSIVE ENTRY
; UPD ID= 1570, SNARK:<5.MONITOR>SCHED.MAC.28, 19-Feb-81 14:10:20 by HALL
;TRY AGAIN RUNNING EXEC0 IN SECTION 1
; UPD ID= 1565, SNARK:<5.MONITOR>SCHED.MAC.27, 16-Feb-81 20:11:29 by MURPHY
;BUT KEEP EXEC0 IN SECTION 0
; UPD ID= 1555, SNARK:<5.MONITOR>SCHED.MAC.26, 12-Feb-81 17:42:30 by MURPHY
;MAKE PSI CODE RUN IN SECTION 1
; UPD ID= 1516, SNARK:<5.MONITOR>SCHED.MAC.25, 4-Feb-81 15:38:04 by MURPHY
;MAKE SURE UMODF ON AT PSISM1 INTERRUPT START
; UPD ID= 1471, SNARK:<5.MONITOR>SCHED.MAC.24, 22-Jan-81 09:27:41 by GRANT
;MAKE SKEDSW CONDITIONALS CONFORM TO CODING STANDARD
; UPD ID= 1463, SNARK:<5.MONITOR>SCHED.MAC.23, 21-Jan-81 11:18:10 by GRANT
;TCO 5.1230 - CHANGE OLD DEBUG SWITCH TO SKEDSW
; UPD ID= 1349, SNARK:<5.MONITOR>SCHED.MAC.22, 12-Dec-80 14:38:16 by MURPHY
;GET JOBPT SETUP EARLIER
; UPD ID= 1279, SNARK:<5.MONITOR>SCHED.MAC.21, 17-Nov-80 12:31:41 by MURPHY
;TCO 5.1198 - NBSWP NOT DECREMENTED
; UPD ID= 1273, SNARK:<5.MONITOR>SCHED.MAC.20, 14-Nov-80 17:51:56 by MURPHY
;ENSURE FORKX IS -1 WHILE RUNNING BGND TASKS
; UPD ID= 1217, SNARK:<5.MONITOR>SCHED.MAC.19, 31-Oct-80 14:57:52 by HALL
;TCO 5.1180 - MOVE DST TO NON-ZERO SECTION
; MAKE SCHED0 RUN IN SECTION 1
; UPD ID= 1208, SNARK:<5.MONITOR>SCHED.MAC.17, 29-Oct-80 11:52:52 by MURPHY
;DITTO
; UPD ID= 1205, SNARK:<5.MONITOR>SCHED.MAC.16, 28-Oct-80 17:35:05 by MURPHY
;TCO 5.1182
;NEW BIAS FLAG SK%CL1 - MAKE CLASS SCHED USE NORMAL QUEUE PRIORITIES IF 1
; UPD ID= 1088, SNARK:<5.MONITOR>SCHED.MAC.15, 1-Oct-80 12:09:05 by MURPHY
;FIX ACVAR
; UPD ID= 968, SNARK:<5.MONITOR>SCHED.MAC.14, 25-Aug-80 16:29:08 by ENGEL
;TCO 5.1136 - ADD DEVLKK
; UPD ID= 792, SNARK:<5.MONITOR>SCHED.MAC.13, 23-Jul-80 20:54:21 by MURPHY
;Fix BUG call
; UPD ID= 782, SNARK:<5.MONITOR>SCHED.MAC.12, 23-Jul-80 11:24:43 by MURPHY
;Be sure JOBRT is 0 when job created
; UPD ID= 764, SNARK:<5.MONITOR>SCHED.MAC.11, 18-Jul-80 15:20:50 by MURPHY
;DETECT NEGATIVE JOBRT
; UPD ID= 596, SNARK:<5.MONITOR>SCHED.MAC.10, 3-Jun-80 17:44:31 by MURPHY
;INIT FACTSW WITH SF%MS1 ON
; UPD ID= 546, SNARK:<5.MONITOR>SCHED.MAC.9, 21-May-80 14:34:20 by MURPHY
;ALWAYS USE HIGHER INTQ IF CLASS SCHEDULING
; UPD ID= 508, SNARK:<5.MONITOR>SCHED.MAC.8, 5-May-80 15:56:19 by MILLER
;TCO 5.1033. GIVE PIBMP IN ASSFK
; UPD ID= 499, SNARK:<5.MONITOR>SCHED.MAC.7, 30-Apr-80 15:09:56 by GRANT
;TCO 5.1030 - Make ?FULL be more informative
; UPD ID= 485, SNARK:<5.MONITOR>SCHED.MAC.6, 28-Apr-80 09:35:13 by MURPHY
; UPD ID= 465, SNARK:<5.MONITOR>SCHED.MAC.5, 23-Apr-80 13:22:17 by MURPHY
;REMOVE WRITE PROTECT CHECKS
; UPD ID= 462, SNARK:<4.1.MONITOR>SCHED.MAC.349, 23-Apr-80 12:00:31 by MURPHY
;FIX STATISTICS
; UPD ID= 431, SNARK:<4.1.MONITOR>SCHED.MAC.348, 13-Apr-80 14:35:11 by OSMAN
;Use FRKTTY instead of FKCTYP
; UPD ID= 338, SNARK:<4.1.MONITOR>SCHED.MAC.347, 17-Mar-80 13:49:19 by MURPHY
;FIX SNOOP BUG, MOVE CALL RCVCH7
; UPD ID= 322, SNARK:<4.1.MONITOR>SCHED.MAC.346, 12-Mar-80 12:14:39 by MURPHY
;FIX JOBSRT
; UPD ID= 317, SNARK:<4.1.MONITOR>SCHED.MAC.345, 11-Mar-80 11:13:06 by ELFSTROM
; UPD ID= 314, SNARK:<4.1.MONITOR>SCHED.MAC.344, 10-Mar-80 18:22:05 by MURPHY
;FIX ASSFK, CHKBMP
; UPD ID= 285, SNARK:<4.1.MONITOR>SCHED.MAC.343, 20-Feb-80 17:56:18 by MURPHY
;REVISE QUEUE PARAMETERS, FLAGS
; UPD ID= 259, SNARK:<4.1.MONITOR>SCHED.MAC.342, 12-Feb-80 18:13:27 by MURPHY
;SKDLV8 AGAIN
; UPD ID= 196, SNARK:<4.1.MONITOR>SCHED.MAC.341, 9-Jan-80 14:45:47 by MURPHY
;FIX LOST FORK CONTEXT IN SKDLV8
; UPD ID= 78, SNARK:<4.1.MONITOR>SCHED.MAC.340, 1-Dec-79 16:00:57 by MILLER
;CHECK FOR SCHEDULER ALARM SPENT IN SCDR. NEEDED NOW BECAUSE
; OF MAIN PATH REORGANIZATION.
;<4.1.MONITOR>SCHED.MAC.339, 29-Nov-79 14:26:50, EDIT BY MILLER
;<4.1.MONITOR>SCHED.MAC.338, 29-Nov-79 14:20:14, EDIT BY MILLER
;FIX TYPEO
; UPD ID= 61, SNARK:<4.1.MONITOR>SCHED.MAC.337, 29-Nov-79 14:06:08 by MILLER
;TCO 4.1.1036 AGAIN
; UPD ID= 59, SNARK:<4.1.MONITOR>SCHED.MAC.336, 29-Nov-79 14:00:19 by MILLER
;TCO 4.1.1036. SAVE AND RESTORE FLKCNT AND FKLOCK OVER JSYSES
; UPD ID= 9, SNARK:<4.1.MONITOR>SCHED.MAC.335, 21-Nov-79 17:35:26 by MURPHY
;<4.1.MONITOR>SCHED.MAC.334, 19-Nov-79 16:35:59, EDIT BY MILLER
;<4.1.MONITOR>SCHED.MAC.333, 19-Nov-79 16:28:48, EDIT BY MILLER
;COMPUTE RT TIME-OUT IN AJBALS
;<4.1.MONITOR>SCHED.MAC.332, 19-Nov-79 15:31:04, EDIT BY MILLER
;<4.1.MONITOR>SCHED.MAC.331, 19-Nov-79 11:20:07, EDIT BY MILLER
;<4.1.MONITOR>SCHED.MAC.330, 19-Nov-79 11:05:32, EDIT BY MILLER
;APPLY RT TEST TO BS HOLD TIME IF MEMORY IS OVERLOADED
;<4.1.MONITOR>SCHED.MAC.329, 13-Nov-79 14:35:25, EDIT BY MURPHY
;<4.1.MONITOR>SCHED.MAC.327, 12-Nov-79 17:25:51, EDIT BY MURPHY
;CHANGE SWAP SPACE LEVEL FOR NEW JOB CUTOFF
;<MURPHY.MON>SCHED.MAC.2, 8-Nov-79 18:04:45, EDIT BY MURPHY
;REORG CODE FOR FASTER MAIN PATH
;<4.1.MONITOR>SCHED.MAC.325, 8-Nov-79 12:25:02, EDIT BY MURPHY
;FIX AC CLOBBERAGE ON ERJMP CERTAIN CASES
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED
;OR COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
;COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1976, 1984.
;ALL RIGHTS RESERVED.
SEARCH PROLOG
TTITLE SCHED
; SCHEDULER - D. MURPHY
IFNDEF FTKLIPA,<FTKLIPA==-1> ;Default is include KLIPA code
;SPECIAL AC DEFINITIONS USED HEREIN
DEFAC (FX,Q3) ;FORK INDEX
;LOCAL MACROS
;USED INTERNALLY BY SCHEDULER
;ENTER SCHEDULER CONTEXT
DEFINE ENTSKD<
SKIPE INSKED
CALL REEBUG ;;ALREADY IN SCHED, BUGHLT
AOS INSKED
XPCW ENSKR> ;GO TO ENSKED
;LOCAL ITEMS IN STG.MAC
EXTN <N2CLKS,CLK2TM,LV8CHK,CLK2CL,SCHPF0,NHOLDF>
EXTN <PAGDIF,ADJSWP,TSTFRP,HPSWRN>
;SCSJSY externals
EXTERN SCSTEQ,SCSBEQ,SCSTCQ,SCSBCQ,SCSTMQ,SCSBMQ,SCSTDQ,SCSBDQ,SCSTXQ,SCSBXQ
EXTERN SCSPSI,SCSPS0,SCSPS1
;CLASS SCHEDULER EXTERNALS
EXTN <CLSSHR,CLSCNT,JOBIRT,CLSUTL,CLSDST,CLSSUM,CLSRJA>
EXTN <MJBUSE,UTLTIM,UTLINT,OLDSLD,CLASSF>
EXTN <JOBDST,JOBCLS,JOBUTL,CLSSHI,MAXCLS,CLSCTL,CLSIRT,CLSSWA>
EDEFST (CLGLC,CLSCNT,17,18) ;COUNT OF PROCESSES ON GOLST FOR THIS CLASS
;LOWER CORE LOCATIONS FOR LITES DISPLAY
SHLTW==:30 ;SCHEDULER HALT REQUEST WORD
;MISC PARAMETERS
MINNR==:4 ;MIN SIZE OF RPLQ FOR LOADING FORK
TRMINT==^D19 ;FORK TERMINATION CHANNEL
DDPMAX==:^D15 ;DDMP OVERDUE MAXIMUM COUNT
CHKMAX==:^D15 ;CHKR OVERDUE MAXIMUM COUNT
;ASSUMED WORKING SET SIZE (MINIMUM) FOR FORK WAKING UP AFTER LONG
;BLOCK.
MINWSS::^D10
;VALUES FOR DISASTER AVOIDANCE - USED ONLY IF SK%HQR = 1
;THESE ARE THE VALUES OF THE HQ LDAV AT WHICH AJNNLF WILL GO OFF AND ON
;RESPECTIVELY. AJNNLF PREVENTS NEW LQ FORKS FROM COMING INTO THE BALSET
;WHEN ON. THE TWO VALUES ARE SEPARATED SLIGHTLY TO PREVENT INSTABILITY.
HQLEV1::4.0 ;'OFF' VALUE FOR AJNNLF
HQLEV2::6.0 ;'ON' VALUE FOR AJNNLF
;THESE ARE THE VALUES OF THE HQ LDAV AT WHICH AJHQOF WILL GO OFF AND ON
;RESPECTIVELY. AJHQOF FORCES LQ FORKS OUT OF THE BALSET. AGAIN, TWO
;VALUES PREVENT INSTABILITY.
HQLEV3::6.0 ;'OFF' VALUE FOR AJHQOF
HQLEV4::9.0 ;'ON' VALUE FOR AJHQOF
;BASIC PERIODS
SKDSCY::^D20 ;SHORT CYCLE
SKDLCY::^D100 ;LONG CYCLE
AJBLCY: ^D1000 ;AJBALS CYCLE
SKDBQT: ^D200*NTMS ;BALSET RUN QUANTUM
MINQNT==^D10*NTMS ;MINMUM TIME BEFORE CHANGING ALARM
SMLSTM==^D10 ;ALARM CYCLE TO CATCH SMALL QUANTA
UTLTMI==^D1000 ;TIME PERIOD
UTLINI==3 ;# OF PERIODS IN A COMPUTE CYCLE
UTLEXP: 0.983471454 ;e-(1/60)
0.9672161 ;e-(2/60)
0.951229424 ;e-(3/60)
0.935506985 ;e-(4/60)
DEFSTR (SKPCT,JOBNAM,2,2) ;SKIP COUNT FOR NEWUTL
MXSKPS==3 ;MAX VALUE OF SKIP COUNT
;THE FOLLOWING MACROS AND COMPUTATIONS ARE NECESSARY DUE
;TO MACROS INABILITY TO PERFORM FLOATING POINT
;COMPUTATIONS.
RADIX 10
MINSHR==5 ;MIN % A SHARE MAY HAVE
MAXVAL==1000/MINSHR ;MAX BIAS FOR CLASS PRIORITY
;NOW SOME MACROS TO DO THE FP CONSTRUCTIONS
DEFINE FLTMIN (A) <
SHRMIN==0.00'A
>
DEFINE FLTMAX (A) <
MXBIAS==A'.0>
;NOW PRODUCE THE VALUES
FLTMIN (\MINSHR) ;FP REPRESENTATION OF MINSHR
FLTMAX (\MAXVAL) ;FP REPRESENTATION OF MAXVAL
RADIX 8 ;RETURN TO DEFAULT RADIX
;Random constant that MACRO can't seem to get in a literal in certain places.
MSEC1A: MSEC1,,0
;STANDARD VALUES FOR SCHEDULER INTERACTIVE/COMPUTATIONAL FLAGS
; ON A SCALE OF 0 - 9
REPEAT 0,< ;FOR REFERENCE ONLY - DEFINITIONS IN MONSYM
SK%CYT==:1B18 ;CYCLE TIME
SK%IOC==:1B19 ;IO QUANTUM CHARGE
SK%HT1==:1B20 ;LIMIT HOLD TIME
SK%HT2==:1B21 ;NO HOLD TIME AFTER SKIPPED FORK
SK%HQR==:1B22 ;HIGH QUEUE FORK HAVE PRIORITY UNDER LOAD
SK%CL1==:1B23 ;CLASS SKED, USE NORMAL QUEUE PRIORITIES IF 1
;SK%BQE==:1B24 ;BALSET QUEUE ON ENTRY
SK%RSQ==:1B25 ;QUICK RESCHEDULE ON WAKEUPS
SK%RQ1==:1B26 ;REQUEUE TO QUEUE 1
SK%TTP==:1B27 ;TTY PREFERENCE
SK%WCF==:1B28 ;WAIT CREDIT PROPORTIONAL TO LOAD AV
SK%TOP==:1B29 ;TTY OUTPUT PREFERENCE
>
; C I H H H C B R R T W T
; Y O T T Q L Q S Q T C O
; T C 1 2 R 1 E Q 1 P F P
SKFLGV::BYTE (18) 0 (1) 1,0,1,1,1,1,1,1,1,1,1,1
BYTE (18) 0 (1) 1,0,1,1,1,1,1,1,1,1,1,1
BYTE (18) 0 (1) 1,0,1,1,1,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,1,1,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,0,1,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,0,1,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,0,0,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,0,0,1,1,0,1,1,1,1
BYTE (18) 0 (1) 1,0,1,0,0,1,1,0,1,1,0,1
BYTE (18) 0 (1) 1,0,1,0,0,1,1,0,1,1,0,1
SKFLDF: BYTE (18) 0 (1) 1,0,1,0,0,1,1,0,1,1,0,1 ;NORMAL DEFAULT
BYTE (18) 0 (1) 1,0,1,0,0,0,1,0,0,1,0,1
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,1,0,0
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,1,0,0
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,1,0,0
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,1,0,0
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,0,0,0
BYTE (18) 0 (1) 1,0,0,0,0,0,1,0,0,0,0,0
BYTE (18) 0 (1) 0,0,0,0,0,0,1,0,0,0,0,0
BYTE (18) 0 (1) 0,0,0,0,0,0,1,0,0,0,0,0
NSKFLV==:.-SKFLGV
;CLASS SCHEDULING STRUCTURE DEFS
DEFSTR (CLSBD,CLSCTL,0,1) ;BATCH JOBS TO DREGS QUEUE
DEFSTR (CLSDF,CLSCTL,9,9) ;DEFAULT CLASS
DEFSTR (CLSBT,CLSCTL,18,9) ;BATCH CLASS
DEFSTR (CLSAC,CLSCTL,19,1) ;IF ON, CLASS BY ACCOUNTS
DEFSTR (CLSKV,CLSCTL,25,6) ;CURRENT KNOB VALUE
DREGS==<LOWQ>B29+LOWQ+1 ;BATCH DREGS PRIORITY WORD
; Execute only information for JSYS trapping
SFEXO==1B1 ;EXECUTE ONLY BIT IN SYSFK
;Code for crash-on-fork facility
;Crash-on-fork code for SCHED4:
DEFINE $CRSF1<
IFN DEBUG,<
SKIPN CRSFRF ;;Are we trying to crash on a fork?
IFSKP. ;;Yes
EXCH T1,CRSFRN ;;Get fork number to crash on
CAME T1,FORKX ;;Is it the current fork?
IFSKP. ;;Yes
MOVE 0,[PAC+1,,1] ;;Restore AC's
BLT 0,17 ;;...
MOVE 0,PAC ;;...
BUG.(HLT,KRSFRK,SCHED,HARD,<Crash-on-fork invoked>,<<FORKX,CRFORK>,<CRSJBN,REQJOB>>,<
Cause: The crash-on-fork facility was invoked, scheduling the specfied
fork and then crashing the system. Console output includes the
crashed fork number and the job number that requested the crash.
>)
ENDIF.
EXCH T1,CRSFRN ;;No, restore T1
ENDIF.
>
>
;Crash-on-fork code for SKDLV8:
;States for CRSFRF:
; .EQL. ZERO No request made
; .EQL. -1 Request made, no PSI yet
; .GTR. ZERO Request made, PSI given
DEFINE $CRSF2 <
IFN DEBUG,<
SKIPL CRSFRF ;;PSI needed for crash-on-fork?
IFSKP. ;;Yes
PUSH P,T1 ;;Save AC's
PUSH P,T2 ;;...
SETZB T1,CRSFRF ;;Get a zero flag-word for PSI
;; and zero crash-on-fork flag
AOS CRSFRF ;;Keep crash-on-fork flag nonzero + positive
HRRZ T2,CRSFRN ;;Get number of fork to be crashed
CALL PSIGR ;;Give him a PSI
POP P,T2 ;;Restore Ac's
POP P,T1 ;;...
ENDIF.
>
>
;The routine for invoking crash-on-fork
;Args: T1/ fork to crash on
IFN DEBUG,<
EXTERN CRSFRN,CRSJBN,CRSFRF
CRSFRK: HRRZM T1,CRSFRN ;Save fork # to crash on
MOVE T1,FORKX ;Get our fork number
HLRZ T1,FKJOB(T1) ;Get our job number
HRRZM T1,CRSJBN ;Save it for attribution
SETOM CRSFRF ;Turn on the crash flag
RET ;Return and wait for the excitement
>
;SCHEDULER INITIALIZATION
SCDIN:: SETZM SYSIFG
SETZM PWRDWN
SETZM FACTSW ;INITIALIZE SYSTEM FLAGS WORD
MOVE F,SKFLDF ;SET DEFAULT CONTROL FLAGS
MOVEM F,SCHFLG
MOVE T1,[BUG.(HLT,SCDUUO,SCHED,HARD,<UUO IN SCHEDULER>,,<
Cause: An illegal instruction has been executed while in
the scheduler's context. Since the scheduler's PSB
is only a prototype PSB and UPT, allowing this MUUO
to behave like others results in bizarre errors
that mask the original problem. This BUGHLT should
be analyzed like an ILLUUO.
Action: Most likley a software bug. Analyze this like any other
ILLUUO.
>)]
MOVEM T1,MJRSTF ;INIT SCHEULER'S UUO DISPTACH TO BUGHLT
MOVEI T1,SKFLDF-SKFLGV+1 ;GET KNOB VALUE
STOR T1,CLSKV ;SAVE IT
MOVEI T1,0
DO.
SETOM @[EP. CLSSWA(T1)] ;INIT WINDFALL ALLOCATION
CAIGE T1,MAXCLS-1
AOJA T1,TOP.
ENDDO.
MOVEI T1,UTLTMI*UTLINI ;DEFAULT INTERVAL FOR UTIL
MOVEM T1,UTLINT ;SET UP INTERVAL
SETZM UTLTIM ;WHEN TO COMPUTE UTILIZATION
MOVX T1,MONENV ;INITIALIZE NEW FLAGS WORD FOR MONITOR MODE
MOVEM T1,RSKCHK+2 ; FOR XCT RSKED
MOVE T1,[MSEC1,,RSKCH1] ;INITIALIZE NEW PC
MOVEM T1,RSKCHK+3 ; FOR XCT RSKED
MOVEI T1,JTLST ; Set up JSYS trap queue
MOVEM T1,JTLSTL
MOVE T1,[1B0+FKPT]
MOVEI 2,NFKS
CALL ILIST ;INIT FREE FORK LIST
HRRZM 1,FREFK
MOVEI 1,JOBPT
MOVEI 2,NJOBS
CALL ILIST
MOVEM 1,FREJOB ;INIT FREE JOB LIST
SETOM JOBRT
MOVE 1,[XWD JOBRT,JOBRT+1]
BLT 1,JOBRT+NJOBS-1
SETZM SCTLW
SETZM SHLTW
SETOM SCDRN1
SETOM FORKX
SETOM TADIDT
SETOM SSKED
MOVEI T1,1 ;ANY POSITIVE VALUE WILL DO
MOVEM 1,INSKED ;INDICATE IN THE SCHEDULER
MOVX 1,SF%FAC!SF%CRD!SF%MS1
;INIT FACTSW TO FACT FILE ON
; AND ALLOW USERS TO CHANGE DIR PARAMETERS
; AND DO MESSAGE LEVEL 1 ONLY
IORM 1,FACTSW
MOVX T1,<1B1> ;GET A LARGE TIME VALUE
MOVEM 1,CHKTIM ;PREVENT CHKR ALARM UNTIL INITIALIZED
MOVEM 1,DDPTIM ;PREVENT DDMP ALARM UNTIL INITIALIZED
;GENERATE LQWBAS TABLE
MOVEI T2,INTQ1 ;FIRST QUEUE TO DO
SCDIN0: FLTR T1,T2 ;GET FLOAT OF QUEUE NUMBER
FDVR T1,FLOWQ ;DO DIVIDE
FSBRI T1,(1.0) ;DO -(1-Q/LOWQ)
FDVRI T1,(10.0) ;COMPLETE COMPUTATION
MOVNM T1,LQWBAS-INTQ1(T2) ;STASH IT
ADDI T2,1 ;NEXT Q
CAIG T2,LOWQ ;ALL DONE?
JRST SCDIN0 ;NO. MORE THEN
CALLRET QBIAS ;SET UP BAIS QUANTUM TABLE
ILIST:: ADDI 1,-1(2)
HLLZM T1,0(T1) ;CLEAR END OF LIST
SOJLE 2,ILIST1 ; SIZE OF BLOCK IN 2
MOVEM 1,-1(1)
SUBI 1,1
SOJG 2,.-2
ILIST1: RET
SUBTTL Channel 7 Interrupt Routines
;CLOCK, POSSIBLE RESCHEDULING, OR START PROCESS FROM SCHEDULER
PISC7:: CLSB SCDCHN ;ISB MUST BE EXPLICITLY CLEARED ON KI
SKIPN RSKCHK+1 ;CALL FROM RESKED CHECK?
IFSKP.
DMOVEM T1,PI7AC1 ;SAVE ACS
DMOVE T1,RSKCHK ;MOVE FLAGS AND PC TO USUAL PLACE
DMOVEM T1,PISC7R
SETZM RSKCHK+1 ;CLEAR INDICATOR
DMOVE T1,PI7AC1 ;RESTORE ACS
ENDIF.
SKIPN SRVSKD ;MSCP SERVER REQUEST OR
SKIPE CFSSKC ;Check on CFS interconnect?
AOS SKEDF3 ;Yes. Make the scheduler run
SKIPN SKEDFC ;FORCED MEMORY CLEAR?
SKIPG SCKATM ;ALARM CLOCK?
AOS SKEDF3 ;YES
SKIPE SKEDF1 ;INITIATED BY SCHEDULER?
JRST SCDR ;YES, GO START PROCESS
SKIPG INSKED ;IN SCHEDULER NOW, OR
SKIPG SKEDF3 ;NO SCHEDULING REQUESTS?
XJEN PISC7R ;IGNORE INTERRUPT
SKIPE NSKED ;OK TO RESCHEDULE?
JRST SCDW ;NO, GO SET TRAP
SKIPGE UTLOCK ;ANY UNIT TESTING BEING DONE?
SKIPE SNPCNT ;ANY SNOOP BREAK POINTS INSERTED?
JRST CHKSNP ;YES, GO SEE IF PC IS INSIDE A BP
;Here to stop the current process. On the KC, new flags word for interrupt
;set the AC blocks to make monitor be current and user be previous. On the
;KL, we have to set them here.
PISC7A:
IFN KLFLG,<
DATAO PAG,SETMON ;SET MON CONTEXT
> ;END OF IFN KLFLG
MOVEM 17,PAC+17 ;SAVE PROCESS AC'S
MOVEI 17,PAC
BLT 17,PAC+16
DMOVE T1,PISC7R ;GET FLAGS AND PC
;On the KL, the process could be at GOUSR, in which case it would have set
;the current AC block to be user, in preparation for returning to the user.
;If so, back up the PC so that the DATAO can be executed again when the
;process is resumed. This isn't necessary on the KC since XJRSTF sets the
;block
IFN KLFLG,<
TXNE T1,UMODF ;MONITOR PC?
IFSKP.
HRRZ T3,T2 ;YES, AT POINT OF RETURN TO USER?
CAIN T3,GOUSR+1
HRRI T2,GOUSR ;YES, RE-EXECUTE DATAO PAG WHEN RESUMED
ENDIF.
> ;END OF IFN KLFLG
DMOVEM T1,PFL
MOVE 1,RSKEDN ;RESET NOSKED TRAP
MOVEM 1,RSKED
AOS INSKED
JSP FX,KISSAV ;SAVE APR-DEPENDENT STUFF
XJEN [MONENV
MSEC1,,SCHED0] ;GO DO THE MAIN SCHEDULER LOOP
;SET TRAP TO CAUSE INTERRUPT ON OKSKED
;Here when process can't be unscheduled now because it is in critical code,
;is NOSKED, or is in a SNOOP breakpoint. Set up RSKED to cause another
;interrupt when the process does XCT RSKED.
SCDW: MOVEM 1,RSKED
SKIPN PNSKDC ;NOSKED DUE TO DIAG?
JRST SCDW1 ;NO
XCT KEPALV ;YES, UPDATE KEEP-ALIVE COUNTER
MOVE 1,SKDSCY ;SET TO COME BACK SHORTLY
MOVEM 1,SCKATM ;CAUSE CHANNEL 7 INTERRUPT IN THIS TIME
SCDW1: MOVE 1,RSKEDT ;GET THE XPCW
EXCH 1,RSKED ;PROCESS WILL EXECUTE XPCW EVENTUALLY
XJEN PISC7R
;Possible contents of RSKED. RSKCHK points to RSKCH1.
RSKEDN: JFCL ;NO-TRAP CONTENTS OF RSKED
RSKEDT: XPCW RSKCHK ;TRAP CONTENTS OF RSKED
;HERE WHEN RESKED REQUEST WAITING AND PROGRAM DOES XCT RSKED
RSKCH1: ISB SCDCHN ;ENTER VIA INTERRUPT
JRST . ;WAIT FOR INTERRUPT TO HAPPEN
;CHECK IF PROCESS IS IN A SNOOP BREAK POINT
; IF YES, THEN THE PROCESS CANNOT BE STOPPED IN CASE BP IS REMOVED
CHKSNP: MOVEM T1,SNPSV1 ;SAVE AN AC FOR TEST
MOVE T1,PISC7R ;GET PC OF PROCESS BEING STOPPED
TLNE T1,(UMODF) ;IN USER MODE?
JRST CHKSN1 ;YES, OK TO STOP HIM THEN
HRRZ T1,PISC7R+1 ;PICK UP PC
CAIL T1,UTREP ;IN THE CRITICAL UTEST ROUTINE?
CAILE T1,UTREPE ;...
SKIPA ;NO
JRST CHKSN0 ;YES, DO NOT RESCHEDULE NOW
CAIL T1,SNPBPP ;IN BREAK POINT PAGES?
CAILE T1,SNPBPP+SNPBPS+SNPDPS-1
JRST CHKSN1 ;NOT IN BP PAGES, OK TO RESKED
CHKSN0: SKIPG T1,SCKATM ;DID WE MISS AN ALARM?
MOVEI T1,2 ;YES. SET IT TO A SMALL VALUE THEN
MOVEM T1,SCKATM ;MAKE SURE ALARM VALUE IS GOOD
MOVE T1,SNPSV1 ;RESTORE AC
JRST SCDW ;SET TRAPS AND CONTINUE PROCESS
CHKSN1: MOVE T1,SNPSV1 ;RESTORE AC
JRST PISC7A ;SAVE CONTEXT, STOP PROCESS
;SETUP AND RESUME PROCESS
;Here when SKEDF1 is set. Main scheduler path does this around SCHED4.
SCDR:
SETZM SKEDF1 ;CLEAR LOCAL FLAG
SETZM INSKED ;NO LONGER IN SCHEDULER
SETOM SSKED
JSP FX,KISLOD ;LOAD APR-DEPENDENT STUFF
;Prepare to tell the hardware what AC blocks to use, based on the user
;mode flag in the new flags word. On the KC, the setting of the AC blocks
;will be done by the XJEN below. On the KL, we do it with a DATAO.
IFN KLFLG,<
MOVE 1,PFL ;GET FLAGS
TXNE 1,UMODF ;RETURNING TO USER OR MONITOR?
SKIPA 1,SETUSR ;USER, GET USER CONTEXT WORD
MOVE 1,SETMON ;GET MONITOR CONTEXT WORD
MOVEM 1,SETPAG ;SAVE FOR USE BELOW
> ;END OF IFN KLFLG
SKIPG T1,SCKATM ;DID WE MISS AN ALARM?
MOVEI T1,2 ;YES. SET IT TO A SMALL VALUE THEN
MOVEM T1,SCKATM ;MAKE SURE ALARM VALUE IS GOOD
MOVSI 17,PAC ;RESTORE PROCESS AC'S
BLT 17,17
IFN KLFLG,<
DATAO PAG,SETPAG ;SET AC BLOCKS
> ;END OF IFN KLFLG
;See whether process was NOSKED or running in critical code. If so, set
;up RSKED so that the scheduler will be run as soon as possible.
;In either case, dismiss the interrupt and run the process.
SKIPN NSKED ;RESUMING NOSKED PROCESS?
SKIPE CRSKED ;OR CSKED PROCESS?
SKIPA
XJEN PFL ;RUN PROCESS
AOS SKEDF3 ;YES, REMEMBER SCHEDULING NEEDED
MOVEM 1,RSKED ;SAVE THE AC
MOVE 1,RSKEDT ;GET THE XPCW TO FORCE SCHEDULER TO RUN
EXCH 1,RSKED ; WHEN THE PROCESS ALLOWS IT
XJEN PFL ;RUN PROCESS
SUBTTL Routines to Enter Scheduler
;VARIOUS WAYS OF ENTERING SCHEDULER
;JSYS HALTF - DISMISS FORK UNTIL INTERRUPT OR EXTERNALLY RESTARTED
.HALTF::MCENT
HALTF1:: ;FORK TERM
HALTX: CALL GETSFX ;GET SUPERIOR FORK INDEX
HRRI 1,HALTT
MOVSI T2,FHV1 ;SAY LOW PRIORITY WAIT
HDISMS
JRST MRETN ;IF CONTINUED
HALTT:: JRST 0(4) ;IDENTIFIABLE TEST FOR HALTED FORK
;SCHEDULING CONTROL MACROS
;NOSKED AND NOSKD1 EXECUTE A NOINT
;OKSKED AND OKSKD1 EXECUTE AN OKINT
;NOSKD1 - ENTERED VIA JSP CX,NOSK11
NOSKD0:: ;TAG FOR HISTORICAL REASONS
NOSK11::SKIPE INSKED
JRST 0(CX)
AOS INTDF
AOS NSKED
JRST 0(CX)
;OKSKD1 - ENTERED VIA JSP CX,OKSK11
OKSK11::
OKSKD0::SKIPE INSKED
JRST 0(CX)
SKIPG NSKED ; ARE WE REALLY NOSKED?
OKSKE1: BUG.(HLT,OKSKBG,SCHED,SOFT,<OKSKD0 - OKSKED WHEN NOT NOSKED>,<<CX,ADR>>,<
Cause: An OKSKED or OKSKD1 was done when the code was not NOSKED.
This is bad as sensitive code may be getting messed up due to
races etc... A NSKDIS would probably have resulted when a
DISMS was done later on.
>)
SOSG NSKED
XCT RSKED
XCT INTDFF
JRST 0(CX)
;CHECK FOR INTERRUPT PENDING ON THIS FORK
;MAY BE CALLED FROM SCHED CONTEXT
;PRESERVES ALL ACS
CKINT0::SAVEAC <FX>
SKIPL FX,FORKX ;GET CURRENT FORK
JE FKPS0,(FX),R ;RETURN IF NO INTERRUPT IS PENDING
AOS SKEDF3 ;REQUEST RESKED
ISB SCDCHN ;INTERRUPT ON SCHEDULER CHANNEL
RET
;CRITICAL SECTION, BGN AND END
;INVOKED BY CSKED AND ECSKED MACROS
CRSKD0::SKIPE INSKED
JRST 0(CX)
NOINT ;IMPLIES NOINT ALSO
AOS CRSKED
JRST 0(CX)
ECSKD0::SKIPE INSKED
JRST 0(CX)
SKIPG CRSKED ;REALLY CSKED?
BUG.(HLT,CSKBUG,SCHED,SOFT,<ECSKED WHEN NOT CSKED>,,<
Cause: An ECSKED was done when the code was not really CSKED. This is
bad as sensitive code may be getting messed up due to races
etc...
>)
SOSG CRSKED ;NOW OUT OF ALL CRITICAL SECTIONS?
XCT RSKED ;YES, CHECK FOR DEFERRED RESCHEDULE
OKINT
JRST 0(CX)
;DISMISS WITH HOLD TIME--KEEP IN BALSET FOR SPECIFIED TIME BECAUSE
;BLOCK EXPECTED TO BE SATISFIED IN THAT TIME.
; 1/ USUAL DISMISS TEST
; 2/ HOLD TIME IN MILLISECONDS
;NORMALLY INVOKED VIA HDISMS(HT) MACRO
EDMSH:: ENTSKD ;ENTER SCHED
TXZ CX,EXFLBT ;MASK OFF FLAGS BITS IF SEC 0
MOVEM CX,PPC ;SAVE PC
MOVE CX,ENSKR ;FIND FLAGS
MOVEM CX,PFL ;SET FLAGS
JRST DISMSH ;JOIN REGULAR DISMISS BUT KEEP 2
;EXEC DISMISS - AC1 CONTAINS XWD DATA,TEST ROUTINE ADR
EDMS0:: ENTSKD ;ENTER SCHEDULER
TXZ CX,EXFLBT ;MASK OFF FLAGS INCASE SECTION 0
MOVEM CX,PPC ;RETURN BECOMES PROCESS PC
MOVE CX,ENSKR ;FIND FLAGS ON THIS CALL
MOVEM CX,PFL ;SAVE FLAGS
DISMSE: MOVE P,PI7P ;INIT SCHED STACK
MOVEI 2,0 ;SAY 0 HOLD TIME
SKIPE CRSKED ;CRITICAL SECTION?
MOVEI T2,^D200 ;YES, STAY IN BALSET FOR A WHILE
DISMSH: PUSH P,2 ;SAVE HOLD TIME
HRRZ T2,T1 ;GET ADR OF ROUTINE
SKIPN NSKED ;CHECK FOR BUGGY DISMISS
CAILE T2,RSCODZ ;CHECK FOR A NON-RESIDENT TEST ROUTINE
BUG.(HLT,NSKDIS,SCHED,HARD,<DISMISS WHILE NOSKED OR WITH NON-RES TEST ADDRESS>,,<
Cause: A process has declared its intention to cease running (dismiss) until
a particular event occurs. The scheduler will test for the occurrence
of the event by calling a routine that the process has provided. The
BUGHLT occurs if one of the following happens:
1. The process has already declared itself to be
NOSKED, thereby preventing the running of other processes;
2. The test routine is in part of the monitor's swappable code
and could therefore cause an illegal page fault in the
scheduler.
>)
STOR T1,FKSTX,(FX) ;PUT IN TEST WORD
; ..
; ..
FRIBP2::! ;(WATCH BPT TAG)
CALL SAVRT ;
LOAD 1,FKSTR,(FX) ;GET SCHEDULER TEST
CAIE 1,HALTT ;FORK TERMINATING?
CAIN 1,FORCTM
CALL SUPUNB ;YES, UNBLOCK SUPERIOR IF NECESSARY
MOVE T3,JOBNO ;GET JOB NUMBER
MOVE T3,@[EP. JOBCLS(T3)] ;GET COUNT OF GOLST PROCESSES
TLNN T3,777776 ;IS THIS HE LAST ONE?
SETZM JOBCK0 ;INIT MEASURING INTERVAL
POP P,2 ;RECOVER HOLD TIME
HLRZ T3,T2 ;GET WAIT PRIORITY
CAIN T3,0 ;GIVEN?
MOVEI T3,FHV3 ;NO, DEFAULT TO MIDDLE VAL
STOR T3,FKGOLN ;SAVE IT
HRRZ T2,T2
IFE. T2 ;IF 0 HOLD TIME,
CALL REMBSJ ;IF 0 HOLD TIME, REMOVE IMMEDIATELY
CALL GLREM ;REMOVE FROM GOLST
CALL WTCONC
SETOB FX,FORKX
JRST SCHED0
ENDIF.
MOVE 1,TODCLK ;HOLD IN BALSET
ANDI 1,377777
ADDI 1,0(2) ;CONSTRUCT SPECIAL TEST FOR HOLD TIME
STOR T1,FKPTD,(FX) ;SAVE TEST DATA
MOVEI 1,DISMT
STOR 1,FKPTR,(FX) ;SAVE TEST ROUTINE
AOS NHOLDF ;COUNT HOLDING FORKS
JRST SCHP3
;RESCHEDULE ON PAGE WAIT
;CALLED VIA JSP CX,SCHEDP
; T1/ Scheduler test
SCHEDP::TXZ CX,EXFLBT ;MASK OFF FLAGS INCASE SECTION 0
XSFM SKDFL ;STORE FLAGS
MOVEM CX,SKDPC ;STORE PC
ENTSKD
SCHP1: PUSH P,1
CALL SAVRT
POP P,1
STOR 1,FKPTX,(FX) ;SAVE SCHEDULER TEST WORD
DMOVE 1,SKDFL ;GET FLAGS AND PC
DMOVEM 1,PFL ;SAVE THEM IN PSB
IFN SKEDSW,<
HRRZ T1,PPC ;Keep a record of PC's that call this routine
SKIPE NSKED ;BLOCK WHILE NOSKED?
CALL NBNSB ;YES, SAVE PC
> ;END IFN SKEDSW
;Here to complete the dismiss. FKPGST contains scheduler test word
SCHP3: MOVE 1,TODCLK ;REMEMBER TIME WAIT STARTED
STOR 1,FKNB%,(FX)
AOS NBWT ;COUNT WAITING BALSET PROCESS
LOAD T1,FKPTR,(FX) ;GET SCHEDULER TEST ROUTINE
CAIE T1,SWPINT ;SWAP WAIT?
CAIN T1,SWPRT
AOS NBSWP ;YES, COUNT
MOVX T1,BSWTB
CALL SCHP2
JRST SCHED0
;RETAIN FORK IN BALSET, SET FLAGS, ETC.
;ACCEPTS:
; T1/ Flags to store into FKSWP
; CALL SCHEDR
;Returns +1: always
SCHP2: OPSTRM <IORM T1,>,FKSWX,(FX)
SKIPE NSKED
MOVEM FX,SSKED ;REMEMBER FORK NUMBER OF NOSKED FORK
SETOB FX,FORKX
RET
;DO OKSKED AND RESCHEDULE
SCHEDR::TXZ CX,EXFLBT ;CLEAR FLAGS INCASE SECTION 0
XSFM SKDFL ;SET FLAGS
MOVEM CX,SKDPC
ENTSKD
SOSGE NSKED
BUG.(HLT,ILOKSK,SCHED,,<OKSKED EXECUTED WHEN NOT NOSKED>,,<
Cause: A process has declared itself to be OKSKED and ready to cease running
(dismiss) until some event occurs. This BUGHLT occurs because the
process is OKSKED, indicating a mismatch of NOSKED and OKSKED states.
>)
SOS INTDF ;FIX UP NOINT AS WELL
JRST SCHP1
;COMMON SCHEDULER ENTER ROUTINE, SAVE AC'S
; ** INSKED MUST BE NON-0 BEFORE THIS CALL **
;Here via ENTSKD macro, which executes XPCW ENSKR
ENSKED::MOVEM 17,PAC+17 ;SAVE PROCESS AC'S
MOVEI 17,PAC
BLT 17,PAC+16
JSP FX,KISSAV ;SAVE APR-DEPENDENT STUFF
MOVE FX,FORKX ;GET INDEX OF CURRENT FORK
MOVE P,PI7P ;GET PDL POINTER
CALL UPDTCK ;UPDATE TODCLK
MOVSI T1,MSEC1
HLLM T1,ENSKR+1 ;FORCE RETURN TO SECION 1
DMOVE T1,PAC+1 ;RESTORE T1 AND T2
XJRSTF ENSKR
;Enter here from APRSRV handling overflow traps
KITRP1::MOVEM 1,KIMUEF ;SAVE CHANNEL NUMBER
ENTSKD ;ENTER SCHEDULER CONTEXT
MOVE 1,KIMUEF ;CHANNEL NUMBER
MOVE 2,FORKX
IFN. T1 ;FOUND ANYTHING?
CALL PSIRQ ;YES, REQUEST INTERRUPT
ENDIF.
DMOVE 1,KIMUFL
DMOVEM 1,PFL ;MOVE PC TO PSB
JRST SCHED0 ;GO TO SCHEDULER
;Several cases come here via CALL - like Charlie on the MTA, it never returns...
REEBUG: BUG.(HLT,SKDCL1,SCHED,HARD,<CALL TO SCHEDULER WHEN ALREADY IN SCHEDULER>,,<
Cause: Code running in scheduler context has attempted to dismiss, block
or page fault thereby trying to enter scheduler context again.
This might result from an unexpected page fault or faulty logic,
i.e. the code doing the dismiss was not expected to be run
in scheduler context.
>) ;SOME SORT OF DISMISS IN SCHED
IFN SKEDSW,<
;ROUTINE TO SAVE PC'S WHICH CAUSE NOSKED BLOCKS
;CALLED FROM PGRTRP ALSO. ALL CALLS CURRENTLY UNDER SKEDSW CONDITIONAL
; T1/ PC TO SAVE
NBNSB:: HRLZ T4,NNSBE ;NEG NUMBER TABLE ENTRIES IN USE
JUMPGE T4,NBNS2 ;JUMP IF TABLE EMPTY
NBNS1: HLRZ T2,NSBTAB(T4)
CAMN T1,T2 ;ALREADY HAVE THIS PC?
JRST NBNS3 ;YES, JUST COUNT IT
AOBJN T4,NBNS1 ;CHECK ALL ENTRIES
NBNS2: CAIL T4,NNSBT ;TABLE FULL?
RET ;YES, CAN'T ADD NEW ENTRY
HRLZM T1,NSBTAB(T4) ;ADD NEW PC TO TABLE
MOVNI T2,1(T4) ;INCREMENT USE COUNT
MOVEM T2,NNSBE
NBNS3: AOS NSBTAB(T4) ;COUNT OCCURRANCES
RET
NNSBT==^D100 ;SIZE OF PC TABLE
RS NSBTAB,NNSBT ; PC,,COUNT
RS NNSBE,1 ;NUMBER OF ENTRIES IN USE
> ;END IFN SKEDSW
SUBTTL Instruction trapping (ITRAP)
;INSTRUCTION TRAP - TRAP PC IN FPC, ASSUMED TO BE I +1
;Called via JSP T2,ITRAP1 (or JRST ITRAP) in process context
ITRAP1::MOVEM 1,LSTERR ;SAVE ERROR CODE GIVEN IN 1
ITRAP:: MOVEM T2,LSTIPC ;SAVE LAST ITRAP PC
;Check for illegal conditions
SKIPE INSKED
BUG.(HLT,SKDTRP,SCHED,HARD,<INSTRUCTION TRAP WHILE IN SCHEDULER>,<<KIMUPC,PC>,<LSTERR,LSTERR>,<LSTIPC,ERRPC>>,<
Cause: An error occurred, resulting in an illegal instruction
trap. If a JSYS is being executed by the monitor, the
process normally receives an error return when this happens.
However, in this case the error occurred in the scheduler,
and there is no recovery.
Data: 1. PC of last MUUO. This may or may not be relevant.
2. Last error code. This may indicate where error was generated.
3. PC where ITRAP was called.
>)
SKIPL FORKX ;NO FORK RUNNING, OR
CONSZ PI,177B27 ;PI IN PROGRESS?
BUG.(HLT,PIITRP,SCHED,HARD,<INSTRUCTION TRAP WHILE PI IN PROGRESS OR IN SCHEDULER>,<<LSTERR,LSTERR>,<LSTIPC,ERRPC>>,<
Cause: An error occurred, resulting in an illegal instruction trap. If a JSYS
were being executed by the monitor, the process would receive an
error return. However, in this case the error occurred while a
hardware interrupt (PI) was being processed, or while the monitor was
executing code that starts the scheduler cycle.
Data: 1. Last error code. This may indicate where error was generated.
2. PC at which error was generated.
>)
SKIPL SLOWF ;NOW IN SLOW CODE?
IFSKP.
BUG.(HLT,ITNOJC,SCHED,HARD,<INSTRUCTION TRAP NOT IN JSYS CONTEXT>,<<LSTERR,LSTERR>,<LSTIPC,ERRPC>,<KIMUPC,MUUOPC>>,<
Cause: The illegal instruction trap handler has been entered, but the
process is not in JSYS context.
Data: 1. Last error code.
2. PC at which error was generated.
3. Last MUUO PC.
>)
ENDIF.
DMOVE 1,KIMUU1 ;GET LAST USER MUUO
DMOVEM 1,UMUUOW ;SAVE AS TRAPPED INSTRUCTION
MOVE P,MPP ;GET LAST STACK FRAME
SETZM INTDF ;NORMALIZE AND PREVENT INTERRUPTS
;See if previous context is monitor and ERJMP present.
DMOVE T1,-1(P) ;GET RETURN PC AND FLAGS
EXCH T1,T2 ;IN PROPER ORDER...
TXNE T1,UMODF ;FROM MONITOR?
IFSKP.
CALL ITRSIM
ANSKP.
MOVEM T3,-1(P) ;ERJMP BACK TO MONITOR, OK.
JRST MRETN ;DO IT
ENDIF.
;Here if the previous level was user or monitor without ERJMP.
;We should not be NOSKED or CSKED. I.e., the
;JSYS code at this level should have cleaned up before
;going to ITRAP. If it didn't, the trap is probably unexpected.
SKIPN CRSKED
SKIPE NSKED ;CHECK FOR PROPER STATE
BUG.(HLT,NOSKTR,SCHED,SOFT,<ITRAP FROM NOSKED OR CSKED CONTEXT>,<<KIMUPC,MUUOPC>,<LSTERR,LSTERR>,<LSTIPC,LSTIPC>>,<
Cause: An illegal instruction trap has occurred while the process
was NOSKED or CSKED. This suggests that important
resources may be left locked.
Action: See if this is reproducible, and if so, report the
sequence to Software Engineering.
Data: 1. PC of last MUUO.
2. Last error code.
3. PC from which ITRAP was called.
>)
;See if previous context was user
TXNN T1,UMODF
IFSKP.
CALL ITRSIM ;YES, CHECK FOR ERJMP
JRST ITR2 ;NONE, GO DO INTERRUPT
MOVEM T3,-1(P) ;YES, DO IT
JRST MRETN
ENDIF.
;Here only if previous context is monitor without ERJMP.
BUG.(CHK,MONNEJ,SCHED,SOFT,<NESTED JSYS WITHOUT ERJMP>,<<T1,FLAGS>,<T2,PC>>,<
Cause: An illegal instruction trap has occured and the previous context
is the monitor, but no ERJMP is present following the nested
JSYS call. This violates required coding practice because
the previous context may have locks that need to be released.
Action: If this is reproducible, report the circumstances to
Software Engineering.
Data: 1. Flags;
2. PC at which faulty nested JSYS was done.
>)
JRST MRETN ;RETURN +1 ANYHOW
;Got to top of stack without an ERJMP. Give an interrupt to the user.
ITR2: MOVE 1,CHNSON
ANDCAM 1,PSIBW ;FLUSH PREVIOUS PANIC BREAKS
MOVEI 1,.ICILI ;INITIATE CHANNEL 15 INTERRUPT
CALL PSIRQ0
CHKINT ;GET THE INTERRUPT "SEEN"
OKINT ;INTERRUPT SHOULD TAKE HERE
JRST MRETN
;BLOCK UNTIL CONDITION SATISFIED
;BLOCK0 - STAYS IN BALSET, BLOCK1 - LEAVES BALSET
;BLOCKE - LIKE BLOCK1 BUT GO ECSKED FIRST
BLOCK0::SUBI CX,2 ;MAKE RETURN TO CALL-1
TXZ CX,EXFLBT ;CLEAR FLAGS INCASE SECTION 0
XSFM SKDFL ;STORE FLAGS
MOVEM CX,SKDPC
ENTSKD
CALL BLOCKS
JRST SCHP1
BLOCKE::PUSH P,CX ;SAVE CX
ECSKED ;NOT CRITICAL NOW
POP P,CX ;RESTORE CX
BLOCK1::ENTSKD
CALL BLOCKS
SUBI CX,2 ;MAKE RETURN TO CALL-1
TXZ CX,EXFLBT ;CLEAR FLAGS INCASE SECTION0
MOVEM CX,PPC ;RETURN BECOMES PROCESS PC
MOVE CX,ENSKR ;PICK UP CALLERS FLAGS
MOVEM CX,PFL
JRST DISMSE
BLOCKS: MOVNI 1,^D100*NTMS
ADDM T1,BSQNT ;CHARGE QUANTUM
MOVE 1,TODCLK
ANDI 1,377777
ADDI 1,^D1000 ;ADD 1000 MILLISECS
MOVSI 1,0(1)
HRRI 1,BLOCKW
RET
;SHORT WAIT TEST. RETURNS NUMBER OF MS LEFT TO WAIT
BLOCKM::JFCL ;SCHED TEST FOR .5 TO 64 SEC.
BLOCKW::MOVE 2,TODCLK ;SCHEDULER TEST, GET TIME
ANDI 2,377777
SUB 1,2 ;DESIRED - NOW = WAIT LEFT
BLK2: JUMPLE 1,1(4) ;NO WAIT TIME LEFT
CAIGE 1,200000 ;BIG DIFFERENCE?
JRST 0(4) ;NO, KEEP WAITING
SUBI 1,400000 ;YES, COMPENSATE FOR WRAPAROUND
JRST BLK2
;DISMISS UNTIL WORD .GE. 0
DISGE:: PUSH P,1
HRLI 1,DISGET ;GIVEN MON ADDRESS IN 1
DISXE: MOVS 1,1
MDISMS
POP P,1
RET
DISGET::SKIPGE 0(1)
JRST 0(4)
JRST 1(4)
;DISMISS UNTIL WORD .L. 0
DISL:: PUSH P,1
HRLI 1,DISLT
JRST DISXE
DISLT:: SKIPL 0(1)
JRST 0(4)
JRST 1(4)
;DISMISS UNTIL WORD .G. 0
DISG:: PUSH P,1
HRLI 1,DISGT
JRST DISXE
DISGT:: SKIPG 0(1)
JRST 0(4)
JRST 1(4)
;DISMISS UNTIL WORD .LE. 0
DISLE:: PUSH P,1
HRLI 1,DISLET
JRST DISXE
DISLET::SKIPLE 0(1)
JRST 0(4)
JRST 1(4)
;DISMISS UNTIL WORD .E. 0
DISE:: PUSH P,1
HRLI 1,DISET
JRST DISXE
DISET:: SKIPE 0(1)
JRST 0(4)
JRST 1(4)
;DISMISS UNTIL WORD .N. 0
DISN:: PUSH P,1
HRLI 1,DISNT
JRST DISXE
DISNT:: SKIPN 0(1)
JRST 0(4)
JRST 1(4)
SUBTTL Sleep and Wakeup JSYS's
;DISMISS FOR SPECIFIED TIME JSYS
.DISMS::MCENT
JUMPLE 1,MRETN
CAIL 1,100000 ;LONG OR SHORT TIME?
JRST TDIS1 ;LONG
MOVE 2,TODCLK
ANDI 2,377777
ADDI 2,0(1) ;COMPUTE TIME TO RESTART
CAIGE T1,^D200 ;VERY SHORT WAIT?
JRST [ MOVEI T1,BLOCKW ;YES, USE BLOCKW AND HDISMS
HRL T1,T2
HDISMS (200) ;HOLD FOR ENOUGH TIME
JRST MRETN]
CAIGE 1,^D2000 ;USE BLOCKW FOR WAIT .L. 2000 MS
SKIPA T1,[FHV4,,BLOCKW] ;SHORT WAIT, USE BLOCKW AND HIGHER PRIORITY
MOVE T1,[FHV2,,BLOCKM] ;BLOCKM AND LOWER PRIORITY
HLL T2,T1 ;PASS BLOCK PRIORITY
HRL T1,T2 ;SETUP TIME
HRRI T2,0 ;NO HOLD TIME
TDIS2: HDISMS ;DISMISS WITH SPECIFIED TEST
JRST MRETN
TDIS1: CALL SETBKT ;COMPUTE TEST DATA
HRRI 1,BLOCKT
MOVSI T2,FHV1 ;VERY LOW PRIORITY
JRST TDIS2 ;GO COMPLETE DISMISSAL
;ROUTINE TO COMPUTE BLOCKT TEST DATA FROM GIVEN TIME IN MS
; 1/ TIME IN MS
; CALL SETBKT
; RETURN +1: ALWAYS, 1/ TEST ARG FOR BLOCKT ,, 0
SETBKT::CAML 1,[400,,0] ;BELOW MAX TIME?
MOVSI 1,400 ;NO, SET TO MAX
MOVE 2,TODCLK ;COMPUTE TIME AT WHICH WAKEUP DUE
TLZ 2,777000 ; IN FORM USED BY BLOCKT
ADD 2,1
LSH 2,-^D10 ;ROUND TO 18-BIT VALUE
MOVSI 1,0(2)
RET
;SCHEDULER WAIT TEST FOR LONG WAIT
;RETURNS NUMBER OF MS LEFT TO WAIT
BLOCKT::LSH 1,^D10 ;RESTORE WAKEUP TIME TO FULL SIZE
MOVE 2,TODCLK ;GET TIME NOW
TLZ 2,777000
SUB 1,2 ;DESIRED-NOW = TIME LEFT TO WAIT
BLKT1: JUMPLE 1,1(4) ;WAKEUP IF NEGATIVE
CAMG 1,[XWD 400,0] ;VERY LARGE DIFFERENCE?
JRST 0(4) ;NO, KEEP WAITING
SUB 1,[XWD 1000,0] ;COMPENSATE FOR WRAPAROUND
JRST BLKT1 ;CHECK AGAIN
;TEMPORARY JSYS'S FOR INTERJOB COMMUNICATION
;HIBERNATE - BLOCK UNTIL SIGNAL OR SPECIFIED ELAPSED TIME
; 1/ 0,,TIME MAXIMUM BLOCK TIME IN SECONDS
; THIBR
; RETURN +1: NEVER
; RETURN +2: SIGNAL RECEIVED OR TIME EXPIRED
.THIBR:: MCENT
IMULI 1,^D1000 ;CONVERT SECONDS TO MS
CALL SETBKT ;COMPUTE TEST DATA FOR TIME
HRRI 1,HIBERT ;CONSTRUCT TEST WORD
MOVSI T2,FHV2 ;LOWER PRIORITY BLOCK
HDISMS
MOVE 1,JOBNO ;DISMISS SATISFIED, CLEAR WAKE BIT
MOVSI 2,(JWAKEF)
ANDCAM 2,JOBNAM(1)
SMRETN
;SCHEDULER TEST FOR HIBERNATING FORK
HIBERT::LOAD 2,FKJBN ;GET JOB NUMBER FOR FORK
MOVSI 3,(JWAKEF)
TDNE 3,JOBNAM(2) ;SIGNAL RECEIVED?
JRST 1(4) ;YES, WAKEUP
JRST BLOCKT ;NO, GO TEST TIME
;WAKEUP - SEND SIGNAL TO JOB WHICH WILL BE SEEN BY THIBR
; 1/ 0,,JOB# NUMBER OF JOB TO BE AWAKENED
; TWAKE
; RETURN +1: BAD JOB NUMBER
; RETURN +2: SIGNAL SENT. DESTINATION JOB WILL BE AWAKENED
; IMMEDIATELY IF NOW IN THIBR OR AS SOON AS NEXT THIBR DONE
.TWAKE:: MCENT
MOVEI T1,0(T1)
CALL GL2LCL ;CONVERT GLOBAL JOB NUMBER TO LOCAL INDEX
RETERR() ;ILLEGAL JOB NUMBER
SKIPGE JOBRT(T1) ;AND JOB EXISTS?
TWAKER: RETERR ATACX1 ;NO
HRRZ T2,JOBDIR(T1) ;GET LOGIN DIRECTORY
JUMPE T2,TWAKER ;ERROR IF JOB NOT LOGGED IN
MOVSI T2,(JWAKEF)
IORM T2,JOBNAM(T1) ;SEND SIGNAL
SMRETN
SUBTTL Null Job
;SCHEDULER
;'NULL' JOB - WAITS WHEN NO FORKS RUNNABLE
SCDNUL: SETOM NULJBF ;TELL THE WORLD WE ARE IN THE NULL JOB
SCDNL2: SKIPE PSKD1 ;ANY BS (POSSIBLE) WAKEUPS
JRST SCDNL1 ;YES, CHECK BS
SKIPN PSKED ;OR DEFINITE CHANGES OF STATE?
SKIPE SKEDF3 ;SCHEDULING REQUESTS?
JRST SCDNL1 ;YES
JRST SCDNL2 ;NO
SCDNL1: SETZM NULJBF ;NO LONGER IN THE NULL JOB
CALL RDSIVL ;GET LAST INSKED INTERVAL
SKIPN NBSWP ;FORKS WAITING FOR SWAPPING?
IFSKP.
ADDM T1,SKDSWP ;YES, CHARGE SWAP-WAIT TIME
ELSE.
SKIPN T2,NBPROC ;ANY RUNNABLE FORKS?
IFSKP.
CAMG T2,NHOLDF ;THAT ARE NOT HOLDING?
ANSKP.
ADDM T1,SKDFIL ;YES, ACCUMULATE OTHER BS WAITS
ELSE.
ADDM 1,SKDIDL ;OTHERWISE CHARGE IDLE TIME
ENDIF.
ENDIF.
JRST SCH0 ;GO SCHEDULE
;READ LAST IN-SCHEDULER INTERVAL FOR STATISTICS
;RETURNS +1,
; T1/ TIME IN HP UNITS SINCE ROUTINE LAST CALLED
; SKDLST/ VALUE OF HP TIME NOW
RDSIVL: JSP 4,MTIME ;READ HP CLOCK
MOVE 2,SKDLST ;GET LAST PREVIOUS READING OF HP CLOCK
MOVEM 1,SKDLST ;SET NEW LAST READING
SUB 1,2 ;COMPUTE TIME SPEND IN NULL JOB
CAIGE T1,0 ;OVERFLOW?
ADD T1,BASOVV ;YES, ADD CORRECTION
RET
SUBTTL Main Scheduler Loop
SCHED0::CONSZ PI,177B27 ;ANY PI IN PROGRESS?
BUG.(HLT,PISKED,SCHED,HARD,<ENTERED SCHEDULER WITH PI IN PROGRESS>,,<
Cause: The monitor started to execute the main scheduler routine. The
hardware indicates that a hardware interrupt is being held. Since
hardware interrupts operate at a higher priority than the scheduler,
this should not happen.
>)
;ENTER SECTION 1, BECAUSE CODE IN PAGEM THAT IS CALLED FROM HERE
;MUST REFERENCE DATA IN NON-ZERO SECTIONS
XJRSTF [MONENV
MSEC1,,.+1] ;SECTION 1 DAMMIT
MOVE P,PI7P ;SETUP LOCAL PDL
SCH0: CALL UPDTCK ;UPDATE TODCLK
XCT KEPALV ;DO KEEP ALIVE
MOVE F,SCHFLG ;SETUP PERM FLAGS
SETZM SKEDF3 ;CLEAR SKED REQUEST
SKIPN CFSSKC ;Need to check on CFS?
IFSKP. ;If so
SETZM CFSSKC ;Clear this
CALL CFONLT ;And do the checking
ENDIF.
SKIPL FX,FORKX ;HAVE FORK SETUP?
CALL UCLOCK ;YES, UPDATE CLOCK
SKIPG SCKATM ;ALARM COUNTED DOWN TO 0?
CALL SCHUPC ;YES, UPDATE CLOCKS
SKIPGE FX,FORKX ;JOB TO CONTINUE?
CALL SKDJOB ;NO, GO SCHEDULE ONE
JUMPL FX,SCDNUL ;RUN 'NULL' JOB IF NO FORK TO CONTINUE
JN FKPS0,(FX),SCHED5 ;IF PSI REQUEST PENDING, GO CHECK IT
;Here when ready to start a process. Force a channel 7 interrupt, which will
;be processed at PISC7.
SCHED4: $CRSF1 ;Generate code for crash-on-fork facility
CALL UPDTCK ;UPDATE TODCLK
AOS SKEDF1 ;SET FLAG FOR CH7 ROUTINE
ISB SCDCHN ;LET IT START PROCESS
JRST . ;WAIT FOR PI TO START
;Fork had an interrupt pending. If possible, give it now.
SCHED5: TMNN FKPS1,(FX) ;PSI NOW BEING DEFERRED?
SKIPE NSKED ;NO. NOSKED FORK?
JRST SCHED4 ;YES, CONTINUE CURRENT SEQUENCE
MOVX T1,FKPSI1 ;CLEAR WORD EXCEPT FOR PI IN PROG
OPSTRM <EXCH 1,>,FKINX,(FX)
MOVEM 1,PIMSK ;PASS REQUEST WORD TO SERVICE ROUTINE
DMOVE T1,PFL ;SAVE PROCESS PC FOR PSI HANDLER
DMOVEM T1,PIFL
DMOVE T1,[MONENV ;SET PPC TO START PSI HANDLER
MSEC1,,PIRQ]
DMOVEM T1,PFL
JRST SCHED4 ;GO START PROCESS
;PERIODIC UPDATE AND CHECK CLOCKS
SCHUPC: SKIPGE FX,FORKX ;HAVE RUNNING FORK?
JRST SKDLV8 ;NO
SKIPG BSQNT ;QUANT EXPIRED?
CALL DISMSJ ;YES
; ..
;ACTIONS DONE 'FREQUENTLY' -- EVERY 20 MS
SKDLV8: $CRSF2 ;Generate code for crash-on-fork facility
CALL RDSIVL ;READ LAST INTERVAL
MOVEM T1,SKDTHS ;ACCUMULATE SCHED TIME
MOVE FX,FORKX
MOVEM FX,LFORKX ;SAVE FORKX, MAKE IT BE -1 DURING BGND STUFF
SETOB FX,FORKX
CALL LV8CHK ;DO DEVICE-DEPENDENT THINGS
CALL TTCH7 ;TTY BIG BUFFER
SKIPE SRVSKD ;NEED TO CHECK SERVER
CALL MSSCHK ;YES, DO IT.
MOVE F,SCHFLG ;RESTORE FLAGS (TTCH7 KNOWN TO CLOBBER)
CALL REMFPB ;CHECK DELETED PAGE QUEUE
MOVE FX,LFORKX ;RESTORE FORKX
MOVEM FX,FORKX
CALL RDSIVL ;READ LAST INTERVAL
ADDM T1,BGNDTM ;ACCUMULATE BACKGROUND OVERHEAD TIME
MOVN T1,SKDTHS ;RESET SCHED OVERHEAD TIME
ADDM T1,SKDLST
CALL CLKCHK ;CHECK FORKS WAITING FOR CLOCK
SKIPE TSKED ;TTY OUTPUT EVENTS?
CALL CHKTL ;YES, CHECK LIST
SKIPE PSKED ;WAKEUPS?
CALL DISMSJ ;YES
CALL SWTST ;CHECK POKE AND SWITCH REQUESTS
MOVE T1,TODCLK
CAML T1,TIM2 ;LONG CYCLE DUE?
CALL CLK2 ;YES
SKIPGE FX,FORKX
IFSKP.
CAME FX,LSTPFK ;SEE IF CONTEXT STILL SETUP
CALL SETPPG
MOVEM FX,LSTPFK
ENDIF.
;Set up to get next timer interrupt. Timer interrupts every millisecond.
;When SCKATM goes to zero, APRSRV generates a channel 7 interrupt. New
;value depends on setting of bias knob.
MOVE F,SCHFLG ;BE SURE WE HAVE FLAGS
MOVE T1,SKDSCY ;SET CLOCK TO SHORT CYCLE TIME
TXNN F,SK%CYT ;NORMAL CYCLE TIMES?
ASH T1,2 ;NO, USE TIMES 4
MOVEM 1,SCKATM
RET
;SECOND PROCESS CLOCK, LESS PRECISE, UPDATES EVERY 100 MS
CLK2: CALL DISMSJ ;DISMISS CURRENT FORK, FORCE SKDJOB
SKIPGE SCDRN1 ;RUNNING SPECIFIC JOB?
IFSKP.
MOVX T1,<1B1> ;GET MASK FOR A LONG TIME FROM NOW
MOVEM T1,CHKTIM ;YES, DISABLE CHKR CHECK
MOVEM T1,DDPTIM ;AND DISABLE DDMP CHECK
ENDIF.
MOVE T1,TODCLK ;GET THE CURRENT TIME
CAMGE T1,CHKTIM ;CHKR OVERDUE?
JRST CLK3 ;NOT OVERDUE
AOS T1,CHKDUE ;BUMP THE COUNT OF OVERDUES
CAIL T1,CHKMAX ;HAS IT BEEN OVERDUE TOO LONG?
BUG.(HLT,CHKRNR,SCHED,SOFT,<CHKR FORK NOT RUN FOR TOO LONG>,,<
Cause: The monitor creates a fork in job zero that exists for the life of
the system. This fork runs periodically to perform essential
functions. The BUGHLT occurs when the scheduler detects that the
CHKR fork has not run in too long a time.
Possible causes for CHKR not running include the following:
1. A disk failure that prevents fork 0 from updating the disk
2. Removal of a mounted structure
3. Logic errors in the monitor.
4. An HSC or MSCP server disk is hung.
>)
CAIE T1,1 ;IS THIS THE FIRST TIME?
BUG.(CHK,NOCHKR,SCHED,SOFT,<CHKR FORK BLOCKED>,<<T1,D>>,<
Cause: The CHKR fork has not run in a while. The monitor is getting
nervous. If the CHKR fork continues to not run for a long time
the a CHKRNR BUGHLT will result.
>)
AOS JB0FLG ;MAKE SURE CHKR WILL RUN
MOVE T1,TODCLK ;GET THE CURRENT TIME
ADD T1,CHKPER ;GET THE ALARM TIME
MOVEM T1,CHKTIM ;SET THE ALARM TIME
CLK3: ;HERE AFTER CHECKING UP ON CHKR
CAMGE T1,DDPTIM ;DDMP OVERDUE?
JRST CLK4 ;NOT OVERDUE
AOS T1,DDPDUE ;BUMP THE OVERDUE COUNT
CAIL T1,DDPMAX ;OVERDUE TOO LONG?
BUG.(HLT,DDMPNR,SCHED,SOFT,<DDMP FORK NOT RUN FOR TOO LONG>,,<
Cause: The monitor creates a fork in job zero that exists for the life of
the system. This fork runs periodically to perform essential
functions. The BUGHLT occurs when the scheduler detects that the
DDMP fork has not run in too long a time.
Possible causes for DDMP not running include the following:
1. A disk failure that prevents fork 0 from updating the disk
2. Removal of a mounted structure
3. Logic errors in the monitor.
>)
CAIE T1,1 ;IS THIS THE FIRST TIME?
BUG.(CHK,NODDMP,SCHED,SOFT,<DDMP FORK BLOCKED>,<<T1,D>>,<
Cause: The DDMP fork has not run in a while. The monitor is getting
nervous. If the DDMP fork continues to not run for a long time
the a DDMPNR BUGHLT will result.
>)
MOVE T1,TODCLK ;GET THE CURRENT TIME
ADD T1,DDPPER ;GET THE NEXT ALARM TIME
MOVEM T1,DDPTIM ;SETTHE NEXT ALARM
CLK4: ;HERE AFTER CHECKING UP ON DDMP
CALL BSBCK
CALL SCLDAV ;UPDATE LOAD AVERAGES, ETC.
CALL RDSIVL
MOVEM T1,SKDTHS ;SAVE SCHED OVERHEAD TIME
;VARIOUS TIMERS AND CHECKS CAN GO HERE
CALL RCVCH7 ;CHECK RCVOK TIMER
MOVE F,SCHFLG ;BE SURE WE HAVE FLAGS
MOVE P5,SKDLCY
TXNN F,SK%CYT ;NORMAL CYCLE TIMES?
ASH P5,2 ;NO, USE TIMES 4
ADD P5,TODCLK ;COMPUTE NEXT TIME DUE
EXCH P5,TIM2 ;SET IT, GET OLD
SUB P5,TIM2 ;COMPUTE INTERVAL SINCE LAST UPDATE
MOVSI P4,-N2CLKS ;SET TO SCAN SECOND LEVEL CLOCKS
CLK21: ADDM P5,CLK2TM(P4) ;UPDATE CLOCK
SKIPG CLK2TM(P4) ;COUNTED OUT?
XCT CLK2CL(P4) ;YES, DO WHATEVER
AOBJN P4,CLK21
CALL RDSIVL ;READ LAST INTERVAL
ADDM T1,BGNDTM ;ACCUMULATE BACKGROUND OVERHEAD TIME
MOVN T1,SKDTHS ;RESET SCHED OVERHEAD TIME
ADDM T1,SKDLST
RET
PI7P:: IOWD NSKDP,SKDPDL
;CHECK LOAD AVS AND LITES
SCLDAV: MOVE T2,TODCLK
SUB T2,RJTTIM
CAIGE T2,^D100 ;TIME FOR UPDATE?
RET ;NO
MOVE T1,TODCLK ;YES, RESET START OF INTERVAL
MOVEM T1,RJTTIM
MOVE T1,NGOJOB ;UPDATE NGOJOB INTEGRAL
SUB T1,NBWT ;DISCOUNT BY FORKS IN BS WAIT FORKS
IMUL T1,T2
ADDM T1,RJTSUM
MOVE T1,NBPROC
IMUL T1,T2
ADDM T1,BSTSUM ;UPDATE NBPROC INTEGRAL
MOVE T1,NWSMEM
IMUL T1,T2
ADDM T1,NWSSUM ;UPDATE NWSMEM INTEGRAL
MOVE T1,SUMNR ;INTEGRATE SUMNR
IMUL T1,T2
ADDM T1,SNRSUM
MOVE T1,NRPLQ ;INTEGRATE NRPLQ
IMUL T1,T2
ADDM T1,RPQSUM
MOVE T1,NHQFK ;UPDATE HIGH-QUEUE FORKS INTEGRAL
IMUL T1,T2
ADDM T1,HQFSUM
MOVE T1,NLQFK ;UPDATE LOW-QUEUE FORKS INTEGRAL
IMUL T1,T2
ADDM T1,LQFSUM
SKIPE CLASSF ;DOING CLASS SCHEDULING?
CALL CLSAVG ;YES. INTEGRATE NRUN FOR THE CLASSES
MOVE 2,TODCLK
CAML 2,RJATIM ;TIME FOR RJAV UPDATE?
CALL DORJAV ;YES
MOVE T1,TODCLK ;GET NOW AGAIN
CAML T1,UTLTIM ;TIME TO DO CLASS UTILIZATION UPDATES?
CALL NEWUTL ;YES. DO IT NOW
MOVE T1,SKDIDL ;UPDATE MS VERSIONS OF HP CLOCKS
IDIVI T1,NTMS
MOVEM T1,SKDTM0
MOVE T1,SKDSWP
IDIVI T1,NTMS
MOVEM T1,SKDTM1
MOVE T1,SKDOVH
IDIVI T1,NTMS
MOVEM T1,SKDTM2
RET
;UPDATE RUNNABLE JOB AVERAGES
DORJAV: MOVEI T1,^D1000 ;SET TIME FOR NEXT UPDATE
ADDM T1,RJATIM
MOVE T1,RJTSUM ;DO TOTAL AVERAGES
SUBM T1,RJAVS1
EXCH T1,RJAVS1
MOVEI T2,RJAV ;TABLE AT RJAV
CALL DORJ1
MOVE T1,HQFSUM ;DO HIGH-QUEUE AVERAGES
SUBM T1,RJAVS2
EXCH T1,RJAVS2
MOVEI T2,HQLAV ;TABLE AT HQLAV
CALL DORJ1
MOVE T1,LQFSUM ;DO LOW-QUEUE AVERAGES
SUBM T1,RJAVS3
EXCH T1,RJAVS3
MOVEI T2,LQLAV ;TABLE AT LQLAV
CALL DORJ1
SKIPE CLASSF ;DOING CLASS SCHEDULING?
CALL CLDRJ ;YES. COMPUTE LOAD AVGS FOR THE CLASSES
FIXR T1,RJAV ;GET INTEGER 1 MIN AVERAGE
MOVEM T1,IRJAV
RET
;RUN AVERAGE ROUTINES FOR THE CLASS SCHEDULER
;ROUTINE TO COMPUTE INTEGRALS FOR EACH OF THE CLASSES
; T2/ TIME INTERVAL
CLSAVG: MOVEI T3,MAXCLS-1 ;SCAN ALL CLASSES
CLSAV0: LOAD T1,CLGLC,(T3) ;GET GOLST POPULATION
IMUL T1,T2 ;COMPUTE N*dt
ADDM T1,@[EP. CLSSUM(T3)] ;ACCUMULATE INTEGRAL
CLSAV1: SOJGE T3,CLSAV0 ;DO ALL CLASSES
RET ;DONE
;ROUITNE TO COMPUTE RUN AVGS FOR THE CLASSES
CLDRJ: SAVEAC <Q1> ;GET A WORK REG
MOVEI Q1,MAXCLS-1 ;SCAN ALL CLASSES
JFOV .+1 ;CLEAR OVERFLOW FLAG
CLDRJ0: FLTR T1,@[EP. CLSSUM(Q1)] ;GET INTEGRAL
MOVE T2,@[EP. CLSSHR(Q1)] ;GET SHARE
CAMGE T2,@[EP. CLSUTL(Q1)] ;GOT ANY WINDFALL?
MOVE T2,@[EP. CLSUTL(Q1)] ;YES. USE UTIL THEN
FDVR T1,T2 ;SCALE
JFOV [ FLTR T1,@[EP. CLSSUM(Q1)] ;IF OVERFLOW, USE SUM AS INTEGRAL
JRST .+1] ;AND PROCEED
SETZM @[EP. CLSSUM(Q1)] ;NO SUM NOW
MOVEI T2,0(Q1) ;GET CLASS
IMULI T2,NRJAVS ;FIND N-WORD CHUNK FOR THIS CLASS
ADD T2,[CLSRJA] ;THE AREA
CALL DORJ2 ;COMPUTE AVERAGES
CLDRJ1: SOJGE Q1,CLDRJ0 ;DO ALL CLASSES
RET ;DONE
;COMPUTE ONE SET AVERAGES
; T1/ INTEGRAL OVER LAST ONE SECOND
; T2/ TABLE TO BE UPDATED - 30-BIT ADDRESS
DORJ1: FLTR T1,T1 ;FLOAT INTEGRAL
DORJ2: FDVRI T1,(1000.0) ;DIVIDE BY 1 SECOND
JFOV .+1 ;CLEAR OV FLAG
MOVEI T3,0
TDO T2,[EP. 0(T3)] ;MAKE EFIW INDEXED BY T3
SCHC1: MOVE T4,@T2 ;GET PRESENT SUM
FSBR T4,T1 ;COMPUTE SUM-TERM
FMPR T4,EXPFF(T3) ;COMPUTE (SUM-TERM)*e(-T/C)
JFOV [ SETZM T4 ;IF UNDERFLOW, ASSUME ZERO
JRST .+1]
FADR T4,T1 ;SUM=(SUM-TERM)e-(T/C)+TERM
MOVEM T4,@T2 ;NEW SUM
CAIGE T3,NRJAVS-1
AOJA T3,SCHC1
RET
;TABLE OF EXP(-T/C) FOR T = 1 SEC.
EXPFF: EXP 0.983471454 ;C = 1 MIN
EXP 0.996672216 ;C = 5 MIN
EXP 0.998889506 ;C = 15 MIN
;TABLE OF 1-EXP(-T/C) FOR T = 1 SEC
REPEAT 0,< ;DON'T NEED THIS NOW
EXPGF: EXP 0.0165285462 ;C = 1 MIN
EXP 0.00332778395 ;C = 5 MIN
EXP 0.00111049406 ;C = 15 MIN
> ;END OF REPEAT 0
;TEST WORD DEPOSITED BY SWITCHES IN 20 OR 30
;ACCEPTS:
;Location 20/
; Bit 0 - go to EDDT breakpoint
; Bit 3 - wait for DDMP to finish and shutdown system
; Bit 34 - reset the front end
; Bit 35 - same as bit 0
;Location 30/
; non-zero to request shutdown of system
; CALL SWTST
SWTST: SKIPE PWRDWN ;POWER DOWN?
JRST SCHPRF ;YES
SKIPE SHLTW ;HALT REQUEST?
JRST SWCRSH ;YES
SKIPN T1,SCTLW ;SWITCHES?
RET ;NO, NOTHING TO DO
SETZM SCTLW
JFFO 1,.+1
CAIGE 2,NSWTT
XCT SWTT(2)
TXNE T1,1B35 ;ALTERNATE MANUAL PAUSE?
JRST SWHLT ;YES
TXNE T1,1B34 ;RESET PROTOCOL?
JRST SWRS11 ;YES
SWTST1: RET
SWTT: JRST SWHLT ;HALT T.S.
JRST SWTST1 ;NOT USED
JRST SWTST1 ;NOT USED
JRST SCWAIT ;INTERNALLY GENERATED - WAIT FOR DOWN
NSWTT==.-SWTT
SWHLT: CALL DISMSJ ;DISMISS CURRENT FORK
CALL SETPSK ;SET SCHED CONTEXT
SKIPE DDTPRS ;DDT LOADED?
SWHLT4: XCT CHKADR ;YES, GET BREAKPOINT
JRST SCHED0 ;RESUME SCHEDULER WHEN PROCEEDED
;POWER FAIL DETECTED
SCHPRF: CALL DISMSJ ;FLUSH CURRENT FORK
CALL SETPSK ;SET SCHED CONTEXT
XCT PWRFLE ;DO ANY SPECIAL POWER FAIL CODE
CALL CASHOF ;MAKE SURE MEMORY IS CORRECT
JRST SCHPF0 ;FINISH IN APRSRV
;RESET FE PROTOCOL
SWRS11: PIOFF
JSR BUGMON ;ENTER SECONDARY
JSR BUGPRI ;ENTER PRIMARY, SHOULD BE IN SYNCH NOW
PION
JRST SCHED0 ;CONTINUE
;Here when 30 is non-zero. Set bit 3 in 20, and start DDMP.
;This will lead to shutdown of system, or breakpoint if set, at SCWAIT.
SWCRSH: SETZM SHLTW
MOVSI 1,(1B3) ;SETUP TO WAIT FOR DDMP COMPLETION
MOVEM 1,SCTLW
SETZM DDTIME ;POKE DDMP
AOS JB0FLG ;DO JOB 0
SETZ 1,
SWRUN2: MOVEM 1,SCDRN1 ;ALLOW ONLY THAT JOB TO RUN
CALL DISMSJ ;DISMISS CURRENT FORK
JRST SWTST1
;Here when bit 3 is set in 20. If DDMP is finished, proceed to hit breakpoint
;or halt processor
SCWAIT: SKIPN DDTIME ;DDMP FINISHED?
JRST [ MOVSI 1,(1B3) ;REISSUE REQUEST
MOVEM 1,SCTLW
JRST SWTST1]
CALL DISMSJ ;DISMISS CURRENT FORK IF ANY
CALL SETPSK ;SET SCHED CONTEXT
SKIPE IOIP ;WAIT FOR IO TO FINISH
JRST .-1
HRROI 1,[ASCIZ /**HALTED**
/]
MOVE 2,CTYLNO
CALL TTEMES ;ANNOUNCE HALT ON CTY
CALL STADYN ;POINT TO DYNAMIC DATA
JRST SWHLT5 ;NOT ACTIVE. SHOULDN'T HAPPEN
PUSH P,T2 ;SAVE DYNAMIC DATA ADDRESS
CALL TTCH7 ;MAKE SURE CTY OUPTUT IN PROGRESS
MOVE T2,0(P) ;GET DYNMAIC DATA ADDRESS
CALL TTSOBE ;SEE IF OUTPUT BUFFER IS EMPTY
JRST .-1 ;NOT YET. KEEP WAITING
POP P,T2 ;DON'T NEED THIS ANYMORE
SWHLT5: SKIPN DDTPRS ;DDT PRESENT?
JRST SWHLT2 ;NO, HALT PROCESSOR
SKIPN DBUGSW ;EXPECTING BREAKPOINTS?
SKIPE DCHKSW
JRST SWHLT4 ;YES, GET ONE
SWHLT2:
PIOFF ;STOP ALL INTERRUPTS
JSR BUGMON ;AND ENTER SECONDARY PROTOCOL
IFN FTKLIPA,<XCT XCKLP> ;STOP THE KLIPA
JRST 4,.+1 ;STOP HERE
JSR BUGPRI ;IF CONTINUES, RESTORE MACHINE
PION ;ALL OF IT
JRST SCHED0 ;AND RESUME SCHEDULER
;SCHEDULER REQUEST PROCESSOR
;MAY BE CALLED FROM SCHEDULER OR PROCESS CONTEXT
; T1/ DATA,,ADDRESS OF FUNCTION
; *MONUMENT*
;Once upon a time, this routine was called at interrupt level with
;several different arguments. At present, it is called only for
;JOBSRT and only in places where JOBSRT could be called directly.
;Therefore, this routine is now just a jacket for JOBSRT after
;verifying that the caller does indeed want JOBSRT.
SCDRQ7::SAVET
NOSKD1
HRRZ T2,T1 ;GET ROUTINE ADDRESS
CAIE T2,JOBSRT ;THE ONE LEGAL CASE?
BUG.(CHK,SRQBAD,SCHED,HARD,<SCDRQ-BAD CALL TO SCDRQ7>,,<
Cause: SCDRQ7 has been called with a function it does not know about.
Action: Fix the call or fix SCDRQ7 to know about this function.
>)
HLRZ T1,T1 ;GET DATA
CALL 0(T2) ;DO IT
OKSKD1
RET
;SCHEDULER REQUESTS
;CREATE A JOB
; T1/ TERMINAL LINE NUMBER OR 0,,-2 IF CRJOB
;Job creation effectively starts here. If called by TTYSRV, a terminal
;has been assigned (because CTRL/C was received on it). This routine picks
;a job number, allocates job storage, and creates the top fork. It then
;sets NEWJB% and NEWFK% in the top fork's FKINT word. Ultimately the fork
;gets to PIRQ with NEWFK% and NEWJB% set.
JOBSRT::SAVEQ
CAMN T1,CTYLNO ;CTY?
JRST JOBSR2 ;YES, ALLOW IF AT ALL POSSIBLE
MOVE 2,SPTC ;CURRENT SPT COUNT
CAML 2,SPC1 ;ABOVE LOGIN LIMIT?
JRST [MOVE T3,[POINT 7,[ASCIZ\?FULL - No more SPT slots
\]]
JRST JOBSR1]
MOVE 2,DRMFRE
CAMG 2,DRMIN1 ;ENOUGH DRUM SPACE?
JRST [MOVE T3,[POINT 7,[ASCIZ\?FULL - No more swapping space
\]]
JRST JOBSR1]
JOBSR2: SAVEAC <Q1,Q2>
SKIPN FREJOB ;ROOM FOR NEW JOB
JRST [MOVE T3,[POINT 7,[ASCIZ\?FULL - No more job slots
\]]
JRST JOBSR1]
SKIPN FREFK ;AND NEW FORK?
JRST [MOVE T3,[POINT 7,[ASCIZ\?FULL - No more forks
\]]
JRST JOBSR1]
MOVE 2,@FREJOB ;ASSIGN JOB NUMBER
EXCH 2,FREJOB
SUBI 2,JOBPT
SETZM JOBRT(T2) ;JOB RUNTIME
SETZRO JOBRTP,(T2) ; No job runtime limit
SETZRO TIMCNT,(T2) ; and no clocks in use yet
SETZM @[EP. JOBIRT(T2)] ;NO INCREMENTAL RUN TIME YET
CAMLE T2,MJBUSE ;HIGHER JOB NUMBER?
MOVEM T2,MJBUSE ;YES
LOAD T3,CLSDF ;GET DEFAULT CLASS
HRRM T3,@[EP. JOBCLS(T2)] ;INIT TO DEFAULT CLASS
AOS @[EP. CLSCNT(T3)] ;COUNT THIS NEW JOB
MOVEM T1,Q1 ;SAVE TTY NUMBER
MOVEM T2,Q2 ;SAVE JOB NUMBER
CALL ASSFK ;GET A FORK IN FX
STOR FX,JBTFK,(Q2) ;SETUP TOP FORK FOR JOB
STOR Q1,JBTTY,(Q2) ;SETUP TTY FOR JOB
STOR Q2,FKJBN ;LEAVE JOB NUMBER IN FORK
CALL ASFSB ;ASSIGN JSB
STOR 1,FKJSB
IFDEF EHLJSB,<
CALL ASSPT ;Assign SPT slot for extended JSB
STOR T1,FKJPT ;Save it
>
MOVE T1,Q1 ;TTY NUMBER
TXO T1,NEWJB%
OPSTRM <IORM 1,>,FKINX,(FX) ;LEAVE TTY NUMBER FOR STARTUP ROUTINE
CALLRET WTCONC ;PUT FORK ON WAIT LIST
;HERE WHEN CAN'T START THE JOB BECAUSE OF SOME SHORTAGE. SEND
;'FULL' TO THE LINE
JOBSR1: TXNE T1,1B18 ;NEGATIVE LINE NUMBER?
JRST JOBSRC ;YES, CRJOB
MOVE T2,T1
MOVE T1,T3 ;GET POINTER TO MESSAGE
PUSH P,2 ;SAVE
CALL TTABRT ;CONDITION LINE FOR TTEMES
CALL TTEMES ;GIVE USER BAD NEWS
POP P,1 ;GET LINE NUMBER
CALL CHKPTY ;IS THIS A PTY
SKIPA ;NO - DONE
CALL PTYFIN ;YES - MAKE IT HUNGRY
RET
JOBSRC: MOVEI T1,CRJBX6 ;SYSTEM FULL ERROR CODE
MOVEM T1,CRJANS ;ANSWER TO OTHER JOB
RET
;ASSIGN FORK SLOT
ASSFK:: MOVE F,SCHFLG
HRRZ FX,@FREFK
EXCH FX,FREFK ;GET FORK, UPDATE LIST
SUBI FX,FKPT
SETZRO FKQ2X,(FX) ;INIT FLAGS AND Q VALUES
MOVEI 1,JSKP
STOR 1,FKSTR,(FX) ;INIT STATUS
SETZRO FKSTD,(FX) ;CLEAR DATA FOR SCHEDULER TEST
CALL INIQ ;GET INITIAL QUEUE FOR FORK
STOR T1,FKQN
MOVE T1,QUANTT(T1) ;GET QUANTUM FOR IT
STOR 1,FKQTM ;ESTABLISH QUEUE
MOVE 1,TODCLK
STOR 1,FKTIM,(FX)
MOVX 1,FKPSI0+NEWFK%
STOR 1,FKINX,(FX) ;LEAVE INTERRUPT REQUEST
SETONE PIBMP ;BE SURE IT RUNS ASAP
SETZRO FKSWX,(FX)
SETZM FKPT(FX)
SETZRO FKIBX,(FX)
SETZRO FKPSB ;CLEAR SPT SLOT FOR PSB
SETZRO FKUPT ;CLEAR SPT SLOT FOR SECTION 0 MAP
SETZRO FKPS2 ;CLEAR SPT SLOT FOR SECOND PSB PAGE
SETZRO FKJSB ;CLEAR SPT SLOT FOR JSB
SETZRO FKJBN ;CLEAR JOB NUMBER
SETZRO FKNWCE ;CLEAR NUMBER ENTRIES IN WORKING SET CACHE
SETZRO FKCSIZ ;CLEAR CURRENT SIZE
MOVEI T1,100100 ;INIT CURRENT AGE TO 100
STOR T1,FKAGE
MOVEI T1,3 ;INIT WORKING SET TO 3
STOR T1,FKWSS
CALL ASFSB ;ASSIGN PSB
STOR 1,FKPSB
CALL ASFSB ;ASSIGN UPT
STOR 1,FKUPT
CALL ASFSB ;GET ONE FOR THE STACK PAGE
STOR T1,FKPS2 ;SAVE IT
RET
;PROCESSOR INTERRUPTS REFERRED FROM APR PI SERVICE
MPEINT: MOVEI 2,.ICDAE ;GIVES I/O ERROR INTERRUPT
EXCH 1,2 ;FORK NUMBER LEFT BY APR ROUTINE
CALL PSIRQ
RET
;BALANCE SET SCHEDULER
;CALLED TO SELECT JOB TO RUN
;RETURNS +1: ALWAYS,
; FX/ FORK HANDLE OF FORK TO RUN
; OR
; FX/ -1 IF NO FORK RUNNABLE
SKDJOB: SETZM PSKED ;CLEAR WAKEUP FLAG
SETZM PSKD1 ;AND POSSIBLE BS WAKEUP FLAG
SETZM SKDFST ;RUNNING FAST
SKIPGE FX,SSKED ;CURRENTLY A NOSKED FORK?
IFSKP.
LOAD T1,FKSWX,(FX) ;GET SWAP FLAGS
JXE T1,FKGL%,BKGND1
JXE T1,FKWSL,BKGND1
TXNN T1,BSWTB ;IN BS WAIT?
JRST SKDJ2 ;NO RUN IT
CALL SKDJ3 ;YES. STILL?
JRST BKGND1
JRST SKDJ2 ;NOW RUNNABLE
ENDIF.
HRRZ FX,GOLST ;SCAN GOLST FOR FORK TO RUN
SKCB5: JUMPE FX,BKGND1 ;NO RUNNABLE FORK
SUBI FX,FKPT ;GET FORK INDEX
HRRZ Q1,FKPT(FX) ;Q1 IS NEXT FORK TO SCAN
LOAD T1,FKSWX,(FX) ;GET SWAP FLAGS
JXE T1,FKWSL,SKCB2 ;IF NOT LOADED, SKIP IT
JXE T1,BSWTB,SKDJ2 ;JUMP IF RUNNABLE
CALL SKDJ3 ;NO, TEST IT
SKIPA
JRST SKDJ2 ;RUN IT
SKCB2: MOVE FX,Q1 ;GET NEXT FORK
JRST SKCB5
;HAVE RUNNABLE FORK - SET IT UP AND RUN IT
SKDJ2: AOS NCSWCH ;COUNT CONTEXT SWITCHES
MOVEM FX,FORKX
CAME FX,LSTPFK ;SAME AS LAST FORK LOADED?
CALL SETPPG ;SETUP PAGER FOR THIS PROCESS
MOVEM FX,LSTPFK ;REMEMBER LAST FORK LOADED
LOAD T3,FKQTM ;SETUP QUANTUM FOR THIS RUN
MOVEM T3,BSQNT
MOVEM T3,BSQNT0
SETZM FKT1 ;CLEAR INCREMENTAL TIME
CALL XGCCHK ;CHECK FOR XGC NEEDED
RET ;DONE
; CHECK WAITING BALANCE SET FORKS
BSBCK: SKIPL FORKX ;FORK CONTEXT SETUP
BUG.(HLT,SKDFKS,SCHED,HARD,<ILLEGAL SCHEDULER ACTION WHILE FORK CONTEXT SETUP>,,<
Cause: The scheduler was about to perform an action that requires that no fork
context is setup. The monitor found that FORKX was non-negative which
indicates that fork context was setup.
Cure: Change the monitor to call DISMSJ before callint the offending
routine or move the call to a more appropriate place. CLK2 always
forces DISMSJ and is usually a good place for periodic actions.
>)
SETOM SKDFST ;NOT RUNNING FAST
SKIPN SKEDFC ;FORCED CLEAR REQUESTED?
IFSKP.
SKIPGE SSKED ;YES, A NOSKED FORK?
JRST SKDJFC ;NO, OK TO DO
ENDIF. ;YES, CAN'T DO IT NOW
CALL TSTBAL ;TEST AND ADJUST BALSET IF NECESSARY
CALL WSMCHK ;DO PERIODIC WS MGT
HRRZ FX,GOLST
BSBCK1: JUMPE FX,R ;DONE
SUBI FX,FKPT
HRRZ Q1,FKPT(FX) ;Q1 IS NEXT FORK TO SCAN
LOAD T1,FKSWX,(FX)
JXE T1,BSWTB,BSBCK2 ;JUMP IF NOT BLOCKED
CALL SKDJ3 ;TEST IT - REMOVE FROM BS WAIT IF DONE
JFCL
BSBCK2: MOVE FX,Q1 ;STEP LIST
JRST BSBCK1
;FOUND NO FORK TO RUN
BKGND1: CALL UPDTCK ;UPDATE TODCLK
MOVSI P1,-NSHAKL ;TRY TO SHAKE LOOSE A JOB
MOVE P2,NGOJOB ;GET NUMBER OF JOBS ON GOLST
BKGND3: SKIPN PSKD1 ;ANY EVENTS?
SKIPE PSKED
JRST BKGND2 ;YES!
PUSH P,P2 ;*** P2 TRASHED BY SOME SCHED ROUTINES
XCT SKDSHK(P1) ;TRY THIS
POP P,P2 ;*** RESTORE P2
CAMN P2,NGOJOB
IFSKP.
AOS PSKD1 ;REQUEST SCHEDULER
JRST BKGNDT ;*****
ENDIF.
AOBJN P1,BKGND3 ;NO
JRST BKGND2
BKGNDT: ;***
CAML P2,NGOJOB ;***CHANGE FOR THE BETTER?
AOS SKDSHQ ;***QUESTION THIS
AOS SKDSHN(P1) ;***YES NOTE HOW WE GOT IT
BKGND2: AOS SKDSHS ;***COUNT TIMES THROUGH SHORT
SETO FX, ;NOTE NO FORK TO RUN
RET
; ROUTINES TO CALL TO TRY TO "SHAKE LOOSE" A RUNNABLE FORK
; ORDER MAY MAKE A DIFFERENCE
SKDSHK: CALL WTCHK ;CHECK WAITING FORKS
CALL SKDLV8 ;DO ALL BACKGROUND STUFF
CALL CLK2
CALL AJBALS ;CHECK BALSET
CALL WSMCHK ;CHECK WS
NSHAKL==.-SKDSHK ;NUMBER OF SHAKE LOOSE ROUTINES
RS PSKD1,1 ;BS EVENT FLAG BUT NO OVERIDE
RS SKDFST,1 ;FAST BS CHECK FLAG
;*** THE FOLLOWING LOCATIONS ARE TEMPORARY PERFORMANCE COUNTERS
RS GOLPWC,1 ;***number of pwc boosts given after bswt
RS SKDSHS,1 ;*** short background
RS SKDSHQ,1 ;***number of "bad" bkgnd decisions
RS SKDBRM,1 ;***number of bswt hold time exp removals
RS SKDBSK,1 ;***number of dismt successes
RS MXQNBO,1 ;***forks on MAXQ that got PWC but still MAXQ
RS MXQGBO,1 ;***SUBSET of above that got boost to MAXQ-1
RS SKDSHN,NSHAKL ;***count of times this routine changes NGOJOB
;HERE TO FORCE UNLOAD OF BALSET AND COLLECT ALL OF MEMORY THAT
;ISNT ACTUALLY LOCKED
SKDJFC: MOVSI P1,-NFKS
SKJFC1: HRRZ FX,P1 ;PLAIN FORK INDEX FOR CALLS
TMNE FKIBS ;IS THIS FORK IN THE BALANCE SET?
CALL CLRIBS ;YES. REMOVE IT
IFQN. FKWSL
CALL REMWS ;IF WS LOADED, REMOVE IT
ENDIF.
AOBJN P1,SKJFC1
;HERE WHEN BALSET UNLOADED, FORCE GCCOR TO FREE MEMORY. GCCOR TAKES
;NOTE OF SKEDFC
CALL GCCOR ;GETS PRIVATE PAGES AND SPT PAGES
SETOM LSTPFK ;NOTE PAGER CONTEXT INVALID
SETZM SKEDFC ;CLEAR BLUNDERBUSS FLAG
JRST SKDJOB ;AND TRY AGAIN.
;TEST WAITING BALSET FORK
; FX/ FORK
; CALL SKDJ3
; RETURN +1: STILL WAITING
; +2: NO LONGER WAITING
SKDJ3: LOAD T2,FKPTR,(FX) ;GET TEST ROUTINE
LOAD T1,FKPTD,(FX) ;SETUP TEST DATA
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX) DO TEST
RET ;STILL WAITING ** NOTE: DISMT BYPASSES THIS
; AND RETS DIRECTLY
FRIBP3::CALL DISACC ;ACCOUNT FOR WAIT (WATCH tag)
MOVE 1,TODCLK ;COMPUTE LENGTH OF TIME WAITED
OPSTR <SUB 1,>,FKNB%,(FX)
LSH T1,-1 ;PENALIZE FOR GOLST WAIT BY FACTOR OF 2
CAIGE T1,^D100 ;ABOVE MINIMUM TIME?
TAMWTC: IFSKP.
AOS GOLPWC ;***
PUSH P,T1 ;***
CALL GLREM ;YES, REMOVE FROM GOLST AND
POP P,T1 ;***
IMULI T1,NTMS ;CONVERT TO HIGH PRECISION UNITS
CALL NEWST2 ;GIVE WAIT CREDIT
CALL GOCONC ;AND REPLACE ON GOLST
ENDIF.
LOAD T1,FKPTR,(FX) ;GET TEST ROUTINE
CAIN T1,PRELWT ;PRELOAD WAIT?
IFSKP.
CAIE 1,SWPINT ;NO, WAS BEING LOADED?
RETSKP ;NO, RETURN RUNNABLE
TMNN PIBMP ;RETURNING TO NORMAL PROCESSING?
SKIPN PRELDF ;PRELOADING DESIRED?
JRST SKDJ3X ;NO
ENDIF.
;Preload wait or being loaded and preloading desired.
MOVE T1,NRPLQ ;SAVE NUMBER PAGES NOW AVAIL
ADD T1,IOIP
PUSH P,T1
CALL PRELD ;TRY TO PRELOAD
IFNSK.
SETONE BSWTB ;NOT COMPLETE, PUT FORK BACK INTO WAIT
STOR T1,FKPTX,(FX) ;WAIT TEST RETURNED BY PRELD
AOS NBWT ;COUNT IT
AOS NBSWP ; AS SWAP WAIT
MOVE 1,TODCLK ;RESET TIME OF START OF WAIT
STOR 1,FKNB%,(FX)
POP P,T1
SUB T1,NRPLQ ;COMPUTE NUMBER PAGES USED FOR LOAD
SUB T1,IOIP
LOAD T2,FKNWCE ;GET PRELOAD RESERVE
CAMGE T2,T1 ;GREATER THAN NUMBER LOADED?
MOVE T1,T2 ;NO, LIMIT
SUB T2,T1 ;REDUCE RESERVE BY AMT LOADED
STOR T2,FKNWCE
MOVN T1,T1 ;REDUCE TOTAL RESERVE
ADDM T1,NRPMIN
RET ;RETURN NOT RUNNABLE
ENDIF.
POP P,T1 ;FLUSH TEMP
SKDJ3X: CALL SOSNEB ;PROCESS FINISHED ENTERING BALSET
RETSKP ;RETURN RUNNABLE
;ACCOUNT FOR BALSET WAIT ON COMPLETION
DISACC: SETZRO BSWTB ;CLEAR WAIT
SOS NBWT ;NOW ONE LESS WAITING PROCESS
MOVE 1,TODCLK ;COMPUTE LENGTH OF TIME WAITED
OPSTR <SUB 1,>,FKNB%,(FX)
CAIGE T1,^D100 ;ABOVE MINIMUM TIME?
IFSKP.
SETZRO <BSNST,BSOVRD> ;YES, NOTE
ENDIF.
LOAD 2,FKPTR,(FX) ;WAIT TEST ADR
ADDM 1,BSWT ;ACCUMULATE TOTAL WAIT
CAIN T2,PRELWT ;PRELOAD WAIT?
IFSKP.
CAIE 2,SWPINT ;OR SWAPIN?
CAIN 2,SWPRT ;OR SWAP?
ANSKP.
ELSE.
ADDM T1,DRMWT ;YES, CHARGE TO DRUM
SOS NBSWP ;REDUCE COUNT OF SWAP WAITS
CAIN T2,SWPRT ;SWAP-IN?
CALL CHGHLS ;YES. DO CHARGING THEN
RET
ENDIF.
CAIE T2,DWRTST ;WRITE WAIT?
IFSKP.
ADDM T1,DWRWT ;YES, CHARGE IT
CALLRET DISMT5 ;DO IO CHARGE AND RETURN
ENDIF.
CAIE 2,UDWDON ;UTILITY DSK? OR
CAIN 2,DSKRT ;DSK?
IFNSK.
ADDM T1,DSKWT ;YES, CHARGE TO DSK
CALLRET DISMT5 ;DO IO CHARGE IF NECESSARY
ENDIF.
RET
;DO IO CHARGE IF NECESSARY
DISMT5: TXNE F,SK%IOC ;QUANTUM CHARGE FOR IO?
RET ;NO
MOVEI T1,^D10*NTMS ;YES, NOMINAL QUANTUM CHARGE
LOAD 3,FKQTM ;CHARGE AGAINST REGULAR QUANTUM
CAIG T3,0(T1) ;WILL RESULT BE POSITIVE?
MOVEI T3,1(T1) ;NO. FORCE IT TO BE SO
SUB 3,1
STOR 3,FKQTM
CALLRET CHGHLF ;CHARGE FOR FILE READ
;CHARGE HOLD TIME FOR FAULT
;ENTRY FOR SWAP READ
CHGHLS: MOVEI T1,2 ;ASSUME SMALL CHARGE
SKIPE PRELDF ;PRELOADING WS?
;ENTRY FOR FILE READ AND FOR SWAP READ IF PRELDF IS ON
CHGHLF: MOVEI T1,^D10 ;LARGE CHARGE
LOAD T3,FKBET ;GET HOLD TIME
JUMPE T3,R ;IF NONE, DONE
SUBI T3,0(T1) ;REDUCE BY QUANTUM CHARGE
STOR T3,FKBET
RET ;AND DONE
;UPDATE FOR PROCESS FINISHED ENTERING BALSET
SOSNEB: LOAD T1,FKNWCE ;WS SIZE RESERVED DURING SWAPIN
MOVN 1,1
ADDM 1,NRPMIN ;REMOVE FROM CORE RESERVE
SOS NEBAL
RET
;WAIT TEST FOR FORK HAVING DONE EDISMS, BEING HELD IN BALSET
; FX/ FORK
; CALL DISMT ;FROM SKDJ3 ONLY
; RETURN +1: CONTINUE SCAN, NO CHANGE TO FORK (OR CHANGED HEREIN)
; +2: UNBLOCK THE FORK
DISMT: LOAD T2,FKSTR,(FX) ;SEE IF EDISMS WAIT FINISHED
LOAD T1,FKSTD,(FX)
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX) WAIT COMPLETED?
IFSKP. <JRST FRIBP1> ;YES, LET FORK RUN
SKIPN SKDFST ;RUNNING FAST
RET ;YES, DON'T DO THIS ** RETURN TO SKDJ3 CALLER
LOAD T1,FKPTD,(FX) ;GET TIME PARAMETER FOR BLOCKW
CALL BLOCKW ;(T1,FX) HOLD TIME EXPIRED?
IFSKP.
AOS SKDBRM ;**** COUNT REMOVALS
SOS NHOLDF ;ONE LESS HOLDING FORK
CALL DISACC ;YES, ACCOUNT FOR WAIT
CALL DISMT2 ;PUT FORK INTO NORMAL BLOCK STATE
RET ;CONTINUE SCAN ** RETURN TO SKDJ3 CALLER
ENDIF.
JE FKPS0,(FX),R ;RETURN IF NO INTERRUPT PENDING **
JN FKPS1,(FX),R ;INTERRUPT PENDING. RETURN IF DEFERRED **
SETONE FKIWT,(FX) ;NOT DEFERRED. REMEMBER FORK WAS WAITING.
FRIBP1::SOS NHOLDF ;ONE LESS HOLDING FORK
AOS SKDBSK ;***
RETSKP
;MOVE FORK FROM HOLD WAIT TO REGULAR NON-BALSET WAIT
; FX/ FORK
DISMT2: ACVAR <W1>
LOAD W1,FKNB%,(FX) ;SAVE TIME THAT WAIT STARTED
CALL REMBSJ ;REMOVE JOB FROM BAL SET
CALL GLREM ;REMOVE FORK FROM GOLST
STOR W1,FKPTX,(FX) ;SAVE TOD OF DISMISS FOR NEWST
CALL WTCON2 ;PUT ON WAIT LIST
RET
ENDAV.
;CALL PERIODIC WS MGT ROUTINES
WSMPER==^D500 ;LENGTH OF PERIOD
WSMCHK: SETOM RWSOKF ;FLAG TO ALLOW REMWS IN WSMGR
CALL TSTGCC ;SEE IF GCCOR NEEDED
SKIPA ;NO
CALL DOGCC ;YES, DO IT AND ACCOUNT OVERHEAD
MOVE T1,SUMNR
ADD T1,NRPLQ
ADD T1,IOIP
CAMGE T1,MAXNR ;UNACCOUNTED PAGES?
CALL DOGCC ;YES, COLLECT
MOVE T1,NRPLQ
ADD T1,IOIP
CAIGE T1,^D32
SETZ T1,
SKIPE NRPLQ
CAMG T1,NRPMIN ;LOW ON MEM?
CALL WSMGR ;YES, FIX
MOVE T1,TODCLK
CAMGE T1,WSMTIM ;TIME FOR UPDATES?
JRST WSMCK1 ;NO
ADDI T1,WSMPER ;YES, SETUP NEXT TIME
MOVEM T1,WSMTIM
CALL STEPFH ;UPDATE HISTORY VALUES
CALL WSMGR ;CHECK FOR SWAP
WSMCK1: SETZM RWSOKF ;RESET FLAG
RET
;STEP FORK HISTORY VALUES - RUN PERIODICALLY
FHUNIT==1B<^L<FKHST>> ;UNIT VALUE IN HISTORY
STEPTC==^D8 ;TIME CONSTANT, LARGER FOR SLOWER CHANGE
STEPFH: MOVSI FX,-NFKS ;SCAN FORK TABLES
STEPH1: SKIPGE FKPT(FX) ;FORK EXISTS?
JRST STEPH2 ;NO
LOAD T3,FKHST
IMULI T3,STEPTC-1 ;COMPUTE H*(X-1)/X
IFQN. <FKIBH,FKIBS> ;WAS IN BALSET **ASSUMES FKIBH FULL DEFSTR**
SETZRO FKIBH
ADD T3,[FHUNIT]
ENDIF.
IDIVI T3,STEPTC
STOR T3,FKHST
STEPH2: AOBJN FX,STEPH1
RET
;GET FORK HISTORY VALUE
;VALUE USED TO RANK FORK WORKING SETS PRIORITY IN MEM
;GREATER NUMBER MEANS HIGHER PRIORITY
; FX/ FORK INDEX
;VALUES IN RESULT
FHMNSK==4000B17 ;NOSKED, TOP PRIORITY
FHMRUN==2000B17 ;RUNNABLE
FHMPQ== 400B17 ;PRIORITY QUEUE
FHMBS== 200B17 ;IN BALSET
FHMCSK== 100B17 ;CRITICAL SECTION
FHMBIP==40B17 ;PI BUMP
;FHMWTS== 70B17 ;WAIT STATE CODE
GFHST: LOAD T4,FKSWX,(FX) ;GET SWAP FLAGS
SETZ T1, ;START WITH 0
TMNE PIBMP ;FORK NEEDS BUMPING FOR PI?
ADD T1,[FHMBIP] ;YES. GIVE IT HELP THEN
TXNE T4,BSNSK ;NOSKED?
ADD T1,[FHMNSK] ;YES, PRIORITY
TXNE T4,BSCRSK ;CRITICAL SECTION?
ADD T1,[FHMCSK] ;YES
LOAD T2,FKQN
CAIG T2,HIGHQ ;ON PRIORITY QUEUE?
ADD T1,[FHMPQ] ;YES, BUMP
TXNN T4,FKBLK ;FORK RUNNABLE?
JRST GFHST1 ;YES
LOAD T2,FKGOLN ;NO, GET BLOCK WAIT PRIORITY
;STOR T2,FHMWTS,T1 ;INCLUDE IN HISTORY WORD
OPSTR <ADD T1,>,FKHST ;USE HISTORY VALUE
RET
GFHST1: ADD T1,[FHMRUN] ;YES, MAKE IT BETTER THAN ALL BLOCKED FORKS
TXNE T4,FKIBS ;IN BALSET?
ADD T1,[FHMBS] ;YES, BASIC UNIT VALUE
OPSTR <ADD T1,>,FKGOLN ;GOLST POSITION IS FINAL DETERMINANT
RET
;WORKING SET MANAGER
;SELECT WORKING SETS TO SWAP INTO OR OUT OF MEMORY
WSMGR: TRVAR <MAXWS,MAXWSF,MINWS,MINWSF,WSMSUP,WSMSNR>
MOVEI T4,NFKS ;ASSIGN GOLST POSITION TO ALL FORKS ON GOLST
HRRZ FX,GOLST
WSMGS1: JUMPE FX,WSMG0 ;JUMP IF END OF LIST
MOVEI FX,-FKPT(FX) ;GET FORK INDEX
STOR T4,FKGOLN ;STORE POSITION
HRRZ FX,FKPT(FX) ;STEP LIST
SOJA T4,WSMGS1 ;STEP POSITION NUMBER
WSMG0: MOVSI FX,-NFKS ;SCAN FORK TO SELECT WORST IN-MEMORY
SETZM WSMSUP ; FORK AND BEST NOT-IN-MEM FORK
SETZM WSMSNR ;INIT SUMNR COUNT
MOVX T1,1B1
MOVEM T1,MINWS
MOVNM T1,MAXWS
SETOM MINWSF
WSMG2: LOAD T1,FKSWX,(FX) ;GET SWAP FLAGS
TXNE T1,FKWSL ;WS IN MEM?
JRST [ LOAD T2,FKWSS ;YES, COMPUTE TOTAL
ADDM T2,WSMSNR
LOAD T2,FKCSIZ
ADDM T2,WSMSUP ;TOTAL USED PAGES
CALL GFHST ;GET HISTORY VALUE
CAML T1,MINWS ;HAVE NEW MINIMUM?
JRST WSMG1 ;NO
MOVEM T1,MINWS ;YES, SAVE VALUE AND FX
HRRZM FX,MINWSF
JRST WSMG1]
TXNN T1,FKIBS ;NOT IN MEM, WANTS TO BE?
JRST WSMG1 ;NO
CALL GFHST ;WS NOT IN MEM, GET HISTORY VAL
CAMG T1,MAXWS ;NEW MAX?
JRST WSMG1 ;NO
MOVEM T1,MAXWS ;YES, SAVE VALS
HRRZM FX,MAXWSF
WSMG1: AOBJN FX,WSMG2
; ..
; ..
MOVE T4,WSMSNR ;CHECK TOTAL
PIOFF ;PREVENT CHANGE AT INT LEVEL
MOVE T3,SUMNR
ADD T4,BALSHC
PION
CAMN T4,T3
IFSKP.
MOVE T3,SUMNR
BUG.(CHK,SUMNR2,SCHED,HARD,<WSMGR-SUMNR INCORRECT>,<<T3,D>,<T4,D>>,<
Cause: This BUG is not documented yet.
Action:
>)
MOVEM T4,SUMNR
ENDIF.
SKIPN RWSOKF ;REMWS OK HERE?
JRST WSMG6 ;NO, NO SWAPOUTS
WSMG8: MOVE T1,NRPLQ
ADD T1,IOIP ;CHECK AVAILABLE MEM
SKIPE NRPLQ
CAMG T1,NRPMIN ;LOW?
JRST WSMG4 ;YES, DO SOMETHING ABOUT IT
SKIPGE FX,MINWSF ;HAVE FORK WHICH COULD GO OUT?
JRST WSMG6 ;NO
JN FKIBS,,WSMG6 ;JUMP IF IT BELONGS IN BALSET
CAIGE T1,^D32 ;DOESN'T, MEM GETTING LOW?
JRST WSMG7 ;YES, FLUSH IT
WSMG6: SKIPGE MAXWS ;HAVE A FORK WAITING TO COME IN?
JRST WSMG3 ;NO
MOVE FX,MAXWSF ;YES, GET ITS FX
MOVE T1,MAXWS ;SEE IF BEST NOT-IN-MEM IS BETTER THAN
SKIPL MINWSF ; WORST IN-MEM (OR NONE IN MEM)
CAMLE T1,MINWS
JRST WSMG5 ;YES, LOAD
LOAD T1,FKWSS ;ELSE, SEE IF FORK WOULD FIT WITH OTHERS
ADD T1,SUMNR
CAML T1,MAXNR ;FITS?
JRST WSMG3 ;NO, DO NOTHING
WSMG5: CALL LOADWS ;LOAD FORK
JRST WSMG3 ;COULDN'T
JRST WSMG0 ;RECHECK
WSMG4: MOVE T2,SUMNR ;MEM DEFINITELY OVERLOADED?
CAML T2,MAXNR
IFSKP.
ADD T2,IOIP ;INCLUDE PAGES DUE
CAML T2,MAXNR ;STILL UNDER LIMIT?
JRST WSMG6 ;NO, DO NOTHING
CALL DOGCC ;COLLECT UNASSIGNED PAGES
MOVE T2,SUMNR ;RECHECK LIMIT
CAMGE T2,MAXNR
JRST WSMG6 ;UNDER, CONTINUE
ENDIF. ;OVER, REMOVE SOMETHING
MOVE T1,NWSMEM
CAILE T1,1 ;MORE THAN ONE FORK IN MEM?
IFSKP.
CALL DOGCC ;NO, CLEAR OUT SHARED PAGES
JRST WSMG6 ;AND LEAVE FORK AS IS
ENDIF.
WSMG7: SKIPGE FX,MINWSF ;HAVE A FORK TO REMOVE?
JRST WSMG3 ;NO, DO NOTHING NOW
TMNN FKBLK ;FORK BLOCKED?
AOS NREMR ;NO, COUNT SWAPOUT OF RUNNABLE FORK
CALL REMWS
SKIPN POSPGF ;POST PURGE DONE?
CALL FKGC ;NO, REMOVE FORK PAGES
JRST WSMG0 ;RECHECK
WSMG3: RET ;DONE
;DO GCCOR AND SWITCH OVERHEAD CHARGING
DOGCC: CALL RDSIVL ;YES, SWITCH OVERHEAD CHARGING
MOVEM T1,SKDTHS
CALL GCCOR
SETOM LSTPFK ;NOTE PAGER CONTEXT INVALID
CALL RDSIVL ;READ LAST INTERVAL
ADDM T1,GCCTIM ;ACCUMULATE GCCOR TIME
MOVN T1,SKDTHS ;RESET SCHED OVERHEAD TIME
ADDM T1,SKDLST
RET
;ADJUST CONTENTS OF BALANCE SET
;SCAN DOWN GOLIST, REMOVING OR ADDING PROCESSES TO BALSET
; AS APPROPRIATE
REPEAT 0,<
RTUNIT==^D10000 ;RT UNIT FOR FORCED REMOVAL
RTMIN==^D30000 ;MINIMUM TIME-OUT
RTMAX==^D120000 ;MAX TIME-OUT
>
AJBYPF==1B0 ;LOCAL FLAG - PASSED A NON-BALSET FK
AJNNLF==1B1 ;NO NEW LQ FORKS
AJHQOF==1B2 ;HQ FORKS ONLY
;AJRTRM==1B4 ;RT REMOVAL FLAG
;LOCAL VARS - PAIRS MUST BE IN ORDER
RS AJBNHQ,1 ;RUNNING NUMBER HQ FORKS
RS AJBNLQ,1 ;RUNNING NUMBER LQ FORKS
RS AJBHQP,1 ;RUNNING TOTAL HQ PAGES
RS AJBLQP,1 ;RUNNING TOTAL LQ PAGES
RS NXTAJB,1 ;TIME NEXT AJBALS DUE
RS AJBFLG,1 ;PERMANENT FLAGS
BSPAD==^D20 ;PAD FOR BALSET SUM
BSPADO==^D10 ;POS OR NEG OFFSET FOR REMOVING OR LOADING
;TEST FOR AJBALS NECESSARY BEFORE SELECTING FORK TO RUN
TSTBAL: MOVE T1,MAXNR
CAMGE T1,SUMBNR ;MEM OVERCOMMITTED?
JRST TSTBL1 ;YES, ADJUST
MOVE T1,TODCLK
CAMGE T1,NXTAJB ;TIME FOR PERIODIC CHECK?
RET ;NO, DO NOTHING
TSTBL1: AOS NAJBAL ;COUNT FORCED CALLS
CALLRET AJBALS ;DO IT
;ADJUST BALANCE SET
AJBALS: TRVAR <AJLODN,AJBLFK,AJBBSC,PRIPST,RTREM>
;ACS Q1,Q2,FX,P1,P2 SHOULD BE SAVED HERE
SKIPE PAGDIF ;NEW PAGES IN SYSTEM?
CALL ADJSWP ;YES. ADJUST PAGING TO MATCH NEW STATE
SETOM PRIPST ;NO SKIPPED PROCESS YET
SETZM AJLODN ;NUMBER FORKS LOADED ON THIS CALL
SETZM AJBNHQ ;INIT VARIABLES
SETZM AJBNLQ
SETZM AJBHQP
SETZM AJBLQP
SETOM AJBLFK
HLL F,AJBFLG ;GET PERM FLAGS
SKIPN CLASSF ;NON-CLASS SCHEDULER?
TXNN F,SK%HQR ;HQ DISASTER AVOIDANCE?
IFSKP.
MOVE T1,HQLAV ;YES, GET CURRENT HQ LDAV
CAMGE T1,HQLEV1 ;BELOW TURN OFF POINT?
TXZ F,AJNNLF ;YES
CAML T1,HQLEV2 ;ABOVE TURN ON POINT?
TXO F,AJNNLF ;YES
CAMGE T1,HQLEV3 ;BELOW TURN OFF POINT?
TXZ F,AJHQOF ;YES
CAML T1,HQLEV4 ;ABOVE TURN ON POINT?
TXO F,AJHQOF ;YES
ELSE.
TXZ F,AJNNLF!AJHQOF ;NO DISASTER AVOIDANCE, NORMALIZE FLAGS
ENDIF.
MOVE T1,MAXNR ;SET LIMIT FOR HOLDING FORKS
SUBI T1,100
MOVEM T1,MAXHNR ;HOLD LIMIT
SETZM BSKED
SETZ Q1, ;INIT NBP COUNT
MOVE 4,BALSHC ;INIT SUMNR COUNT
ADDI T4,BSPAD ;INCLUDE PAD
MOVEM T4,AJBBSC ;SAVE BASE
MOVEI Q2,BSLST ;SCAN LIST OF RECENT BALSET ENTRIES
REPEAT 0,<
TXZ F,AJRTRM ;ASSUME NOT DOING RT REMOVAL
MOVE T1,NBPROC ;GET # IN BS
CAMN T1,NGOJOB ;ALL IN?
JRST AJBS2 ;YES
MOVE T1,IRJAV ;GET CURRENT LOAD AVG
IMULI T1,RTUNIT ;COMPUTE TIME TO HOLD PROCESSES
CAIGE T1,RTMIN
MOVEI T1,RTMIN
CAILE T1,RTMAX
MOVEI T1,RTMAX ;MAKE SURE NUMBER IS GOOD
MOVEM T1,RTREM ;SAVE IT
TXO F,AJRTRM ;SAY DOING REMOVALS
> ;END REPEAT 0
AJBS2: HRRZ Q2,0(Q2) ;GET NEXT
JUMPE Q2,AJBAL4 ;JUMP IF END OF LIST
MOVEI FX,-FKBSPW(Q2)
SETZRO FKBSHF ;ASSUME NOT HOLDING
LOAD T1,FKBET ;GET HOLD EXPIRATION TIME
LOAD T2,FKJBN
SUB T1,JOBRT(T2) ;COMPUTE TIME REMAINING
REPEAT 0,<
TXNN F,AJRTRM ;ALL PROCESSES FIT?
JRST AJBS0 ;YES. SKIP RT TEST THEN
HLRZ CX,0(Q2) ;GET ENTRY TIME
HRRZ P2,TODCLK ;GET NOW
SUB P2,CX ;COMPUTE TIME SINCE ENTERED
SKIPGE P2 ;CHECK FOR OVERFLOW
ADD P2,[1B17] ;YES. FIX IT
CAMG P2,RTREM ;TOO LONG?
AJBS0: > ;END REPEAT 0
TXNE T1,FKBETH ;NEGATIVE NUMBER? (CHECK HIGH-ORDER BIT)
JRST [ SETZRO FKBET ;YES, SET TIME EXPIRED
CALL REMBSL ;REMOVE FROM PROTECT LIST
JRST AJBS2]
LOAD T1,FKWSS
ADD T1,T4
SUBI T1,BSPAD
CAMLE T1,MAXHNR ;ROOM TO HOLD FORK?
JUMPG Q1,AJBS2 ;NO (UNLESS FIRST FORK SEEN)
SETONE FKBSHF ;SET HOLD FLAG
CALL AJBUQS ;STILL HOLDING, COUNT PAGES
ADDM T1,T4
AOJA Q1,AJBS2
;SCAN GOLST CHECKING ALL FORKS, AND REMOVE, LOAD, OR
;LEAVE AS IS.
AJBAL4: TXZ F,AJBYPF ;INIT FLAG
MOVEI Q2,GOLST
AJBAL1: HRRZ Q2,0(Q2) ;GET NEXT
AJBL10: JUMPE Q2,AJBALX ;DONE IF REACHED END OF GOLST
MOVEI FX,-FKPT(Q2) ;GET FORK INDEX
LOAD P2,FKQN ;CHECK FORK QUEUE
CAIGE P2,MAXQ ;HIGH QUEUES?
TDZA P2,P2 ;YES, USE 0 INDEX
MOVEI P2,1 ;NO, USE 1 INDEX
JE FKIBS,,AJBAL5 ;JUMP IF NOT IN BALSET
FRIBP0: JN FKBSHF,,AJBAL1 ;IF HELD, ALREADY ACCOUNTED
JN <BSNSK,BSCRSK>,,AJBL77 ;IF NOSKED OR CRSKED, TRY TO KEEP IT
JN PIBMP,,AJBL77 ;KEEP IF PI'ING
SKIPG CLASSF ;WITHHOLDING WINDFALL?
IFSKP.
CALL CKAHED ;YES. IS THIS ONE AHEAD?
ANSKP.
JRST AJBL9 ;YES, REMOVE FROM BALSET AND MEM
ENDIF.
TXNE F,AJHQOF ;HQ FORKS ONLY?
JUMPN P2,AJBL9 ;YES, FLUSH IF LQ
JUMPE Q1,AJBAL7 ;NO FURTHER CHECKS IF FIRST FORK SEEN
AJBL77: LOAD 1,FKWSS
ADD 1,4
SUBI T1,BSPAD ;REDUCE BY PAD OFFSET
CAMG Q1,MAXBP ;FORK STILL FITS IN BALSET?
CAMLE 1,MAXNR
JRST AJBL12 ;NO
AJBAL7: LOAD T1,FKWSS ;GET SIZE
ADDM T1,4 ;UPDATE SUM
CALL AJBUQ0 ;UPDATE QUEUE SUMS
AOJA Q1,AJBAL1 ;COUNT FORK
;HERE IF FORK NOW IN BALSET DOESN'T APPEAR TO FIT.
AJBL12: HRRZ Q2,0(Q2) ;STEP LIST
CALL CLRIBS ;NOTE NOT IN BALSET
TXON F,AJBYPF ;NOTE PASSED A FORK NOT IN BALSET
CALL SETPRP ;IF FIRST ONE, DO PRIORITY STUFF
AOS NREMJ ;NOTE FORCED REMOVALS
JRST AJBL10
;HERE TO REMOVE FORK FROM BALSET AND SWAPOUT IMMEDIATELY
AJBL9: CALL CLRIBS
AJBAL2: JE FKWSL,,AJBAL1 ;JUMP IF WS NOT LOADED
HRRZ Q2,0(Q2) ;STEP LIST
PUSH P,T4 ;SAVE SUMBNR COMPUTATION
CALL REMWS ;SWAPOUT
POP P,T4 ;RESTORE LOCAL SUMBNR
JRST AJBL10
;FORK NOT NOW IN BALSET
AJBAL5: SKIPG CLASSF ;WITHHOLDING WINDFALL?
IFSKP.
CALL CKAHED ;YES. IS THIS FORK AHEAD?
ANSKP.
JRST AJBAL2
ENDIF.
SKIPGE SPMLCK ;SOMEONE TRYING TO GET A PAGE?
IFSKP.
CALL TSTFRP ;YES. IS THIS FORK HOARDING THE PAGE?
JRST AJBAL1 ;YES. DON'T LOAD IT
ENDIF.
JUMPE Q1,AJBAL6 ;NO FURTHER CHECKS IF FIRST FORK SEEN
LOAD T1,FKWSS ;CHECK SIZE
ADD T1,T4 ;BALSET SUM WHICH WOULD INCLUDE THIS FORK
ADDI T1,BSPADO ;INCREASE BY PAD OFFSET
CAMGE Q1,MAXBP ;ROOM IN BALSET FOR ANOTHER FORK?
CAMLE T1,MAXNR ;ROOM FOR THIS FORK'S PAGES?
JRST AJBL11 ;NO
TXNE F,AJNNLF ;ALLOW NEW LQ FORKS?
JUMPN P2,AJB666 ;NO. IF LQ CHECK FOR SPECIAL LOADING
SKIPE CLASSF ;CLASS SCHEDULING BEING USED?
TXNN F,AJBYPF ;YES. BYPASSED ANYBODY?
SKIPA ;NO
JRST [ CALL CORFCT ;YES. GET PRIORITY OF THIS PROCESS
CAMGE T1,PRIPST ;THIS ONE LOWER THAN ONE PASSED?
JRST AJB667 ;YES. CHECK FOR SPECIAL LOAD
CALL SETIBS ;NO. LOAD IT THEN
JRST AJBAL7] ;AND PROCEED
AJBAL6: CALL SETIBS ;NOTE IN BALSET
TXNE F,SK%HT2 ;NO HOLD TIME IF SKIPPED PROCESS?
TXNN F,AJBYPF ;YES, SKIPPED A PROCESS?
JRST AJBAL7 ;NO. ACCOUNT FOR IT
AJBL69: SETZRO FKBET ;YES. NO HOLD TIME NOW
CALL REMBSL ;REMOVE FROM PROTECTED LIST
JRST AJBAL7 ;AND PROCEED
AJBL11: TXON F,AJBYPF ;NOTE PASSED A FORK NOT IN BALSET
CALL SETPRP ;IF FIRST TIME, DO PRIROITY STUFF
JRST AJBAL1
;FORK CANNOT BE LOADED ACCORDING TO NORMAL RULES. CHECK FOR SPECIAL
;LOADING CRITERIA
AJB666: SKIPA T1,[AJBAL1] ;WHERE TO GO
AJB667: MOVEI T1,AJBL11 ;WHERE TO GO
JN BSCRSK,,AJB668 ;IF CRSKED, LOAD IT
JN PIBMP,,AJB668 ;OR IF PI ALSO
JRST 0(T1) ;CAN'T LOAD IT, GIVE UP
AJB668: CALL SETIBS ;PUT IN BALSET
JRST AJBL69 ;BUT NO HOLD TIME
;UPDATE RUNNING QUEUE SUMS
AJBUQS: LOAD P2,FKQN ;SET QUEUE SET INDEX
CAIGE P2,MAXQ
TDZA P2,P2 ;USE 0 FOR INTERACTIVE QUEUES
MOVEI P2,1 ;1 FOR COMPUTE QUEUE
AJBUQ0: LOAD T1,FKWSS ;UPDATE FOR CURRENT FORK
ADDM T1,AJBHQP(P2) ;COUNT PAGES
AOS AJBNHQ(P2) ;COUNT FORKS
RET
;ROUTINE OF AJBALS TO HANDLE FIRST INSTANCE OF A FORK THAT
;WON'T FIT
SETPRP: SKIPN CLASSF ;CLASS SCHEDULING?
RET ;NO. NOTHING TO DO HERE THEN
CALL CORFCT ;YES. GET PRIROITY OF THIS PROCESS
CAMLE T1,[1.0] ;ONE OF THE COMPUTING PROCESSES?
JRST [ TXZ F,AJBYPF ;NO. IGNORE THE SKIP THEN
RET] ;AND DONE
MOVEM T1,PRIPST ;SAVE PRIORITY OF THIS PROCESS
RET ;AND DONE
;EXIT FROM AJBALS
AJBALX: SUB T4,AJBBSC ;REMOVE PAD AND ORIG BALSHC
PIOFF ;PREVENT CHANGE AT INT LEVEL
MOVE T3,SUMBNR
ADD T4,BALSHC ;INCLUDE CURRENT BALSHC
PION
CAMN T4,T3 ;CHECK SUM
IFSKP.
MOVE T3,SUMBNR
BUG.(CHK,SUMNR1,SCHED,HARD,<AJBALX-SUMBNR INCORRECT>,<<T3,D>,<T4,D>>,<
Cause: This BUG is not documented yet.
Action:
>)
MOVEM T4,SUMBNR
ENDIF.
MOVE T1,TODCLK ;SET TIME FOR NEXT PERIODIC CALL
ADD T1,AJBLCY
MOVEM T1,NXTAJB
MOVEM F,AJBFLG ;SAVE NEW SETTINGS
MOVE T1,AJLODN ;RETURN COUNT OF FORKS LOADED THIS CALL
RET
;CHECK FOR POSSIBILITY OF LOADING FORK INTO BALSET
CHKTFK: SAVEQ
MOVEI Q2,GOLST
CHKTF1: HRRZ Q2,0(Q2) ;GET NEXT FORK ON GOLST
JUMPE Q2,R ;DONE WHEN LIST NULL
MOVEI FX,-FKPT(Q2) ;GET FORK INDEX
JN FKIBS,,CHKTF1 ;JUMP IF FORK IN BALSET
SKIPGE SPMLCK ;IS SOME FORK TRYING TO GET A PAGE?
IFSKP.
CALL TSTFRP ;YES. IS THIS FORK GUILTY OF HOLDING IT?
JRST CHKTF1 ;YES. SKIP IT THEN
ENDIF.
CALL TRYLDF ;SEE IF IT CAN BE LOADED
RET ;COULDN'T, TRY NO MORE
JRST CHKTF1 ;COULD, TRY AGAIN
;CHECK SPECIFIC FORK FOR LOADING INTO BALSET
;N.B. (THIS IS A MONUMENT). THIS CODE SHOULD NEVER BE
;CALLED TO LOAD A FORK OF LOWER PRIORITY THAN ONE NOT LOADED.
;THAT IS, IF A FORK HIGHER ON GOLST CAN NOT BE LOADED, THEN
;DON'T CALL TRYLDF TO LOAD THIS ONE. PRESENTLY, CHKTFK IS
;THE ONLY USER OF TRYLDF AND IT DOES THE RIGHT THING.
;WOE BE TO HE (OR HER) THAT VIOLATES THIS TRUST.
TRYLDF: MOVE T2,AJBFLG ;GET AJBALS PERMANENT FLAGS
JN BSCRSK,,TRYLD0 ;IF CSKED, ALWAYS TRY
JN PIBMP,,TRYLD0 ;IF PI'ING, ALSO LOAD
TXNN T2,AJNNLF ;LQ FORK ALLOWED?
IFSKP.
LOAD T1,FKQN ;NO
CAIL T1,MAXQ ;THIS FORK LQ?
RET ;YES, DON'T LOAD
ENDIF.
SKIPG CLASSF ;CLASS SCHED?
IFSKP.
CALL CKAHED ;WINDFALL?
ANSKP.
JRST TRYLD2 ;NO, DON'T LOAD
ENDIF.
TRYLD0: LOAD T1,FKWSS ;GET WS SIZE
ADDI T1,BSPAD ;INCREASE BY PAD AND OFFSET
ADD T1,SUMBNR ;COMPUTE BALSET SIZE WITH FORK
CAML T1,MAXNR ;FORK WS FITS?
JRST TRYLD2 ;NO, DON'T LOAD
CALL SETIBS ;NOTE FORK IN BALSET
TMNN FKWSL ;WS NOW LOADED?
SETZM WSMTIM ;NO, CHECK SOON
RETSKP ;DONE
TRYLD2: RET
;REMOVE FORK FROM BALSET WHEN BLOCKING
REMBSJ: JE FKIBS,,R ;RETURN IF ALREADY OUT
CALL CLRIBS
LOAD T1,FKWSS
LOAD T2,FKCSIZ
ADDI T2,4
CAMGE T2,T1 ;WS SMALLER NOW?
CALL [ MOVE T1,T2 ;YES, REDUCE RESERVE
CALLRET ADJWSS]
LOAD 2,FKJBN ;MAINTAIN SUBSYSTEM INFO...
HRRZ 2,JOBNAM(2)
LOAD 1,FKWSS
ADDM 1,@[EP. SSIZE(2)] ;INTEGRATE WS SIZE
AOS @[EP. SNBLKS(2)] ;AND COUNT NUMBER OF SAMPLES
RET
;NOTE FORK IN/OUT OF BALSET, MAINTAIN COUNT
; FX/ FORK INDEX
SETIBS: SETONE <FKIBS,FKIBH>
SETZRO FKBSHF ;INIT HOLD FLAG
JXE F,SK%HT1,SETIB2 ;ALWAYS DO HOLD IF SK%HT1 0
MOVE T1,NBSL ;NUMBER HOLDING FORKS
CAIL T1,2 ;ENOUGH NOW?
JRST SETIB1 ;YES, NO MORE
JUMPE T1,SETIB2 ;GIVE HOLD TIME IF NO OTHERS
MOVE T1,SUMBNR
ASH T1,1
CAML T1,MAXNR ;IF 1 OTHER, GIVE HOLD TIME IF
JRST SETIB1 ; BALSET LESS THAN HALF FULL
SETIB2: CALL APPBSL ;APPEND FORK TO BALSET LIST
MOVEI T2,^D10000 ;MAX HOLD TIME IF BIAS SCHEDULER
SKIPE CLASSF ;IS IT?
MOVEI T2,UTLINI*UTLTMI ;NO. SET TO NEWUTL CYCLE THEN
LOAD T1,FKWSS ;COMPUTE HOLD TIME AS SIZE * 20 MS
IMULI T1,^D20
CAIGE T1,^D1000 ;AT LEAST 1 SEC
MOVEI T1,^D1000
CAILE T1,0(T2) ;OVER MAX LIMIT?
MOVEI T1,0(T2) ;YES. APPLY LIMIT THEN
LOAD T2,FKJBN
ADD T1,JOBRT(T2) ;COMPUTE EXPIRATION TIME
STOR T1,FKBET
SETIB1: LOAD T1,FKWSS
ADDM T1,SUMBNR ;UPDATE BALSET SUM
AOS NBPROC
RET
CLRIBS: SETZRO <FKIBS,FKBET>
CALL REMBSL ;REMOVE FORK FROM LIST
LOAD T1,FKWSS
MOVN T1,T1
ADDM T1,SUMBNR ;UPDATE BALSET SUM
SOS NBPROC
RET
;APPEND FORK TO BALSET LIST
APPBSL: SAVEAC <Q1,Q2>
MOVEI Q1,BSLST
APPBS1: HRRZ Q2,0(Q1) ;GET NEXT, SAVE PREV PTR
JUMPN Q2,[MOVE Q1,Q2 ;STEP AGAIN IF NOT END OF LIST
JRST APPBS1]
MOVEI Q2,FKBSPW(FX) ;END OF LIST, MAKE PTR TO NEW FORK
HRRM Q2,0(Q1) ;APPEND
SETZRO FKBLP ;NEW END
AOS NBSL ;MAINTAIN COUNT
RET
;REMOVE FORK FROM BALSET LIST
REMBSL: MOVEI T1,BSLST
CLRIB1: HRRZ T2,0(T1) ;GET NEXT, SAVE PREV
JUMPE T2,R ;NOT ON LIST, IGNORE
CAIE T2,FKBSPW(FX) ;DESIRED ONE?
JRST [ MOVE T1,T2 ;NO, STEP
JRST CLRIB1]
HRRZ T2,0(T2) ;SPLICE LIST
HRRM T2,0(T1)
SOS NBSL ;MAINTAIN COUNT
RET
;CHANGE FKNR, UPDATE SUMNR IF NECESSARY
; T1/ NEW VALUE OF FKNR
; FX/ FORK INDEX
ADJWSS::JE FKWSL,,ADJWS1 ;JUMP IF FORK WS NOT LOADED
LOAD T2,FKWSS ;WS IN MEM, MUST UPDATE SUMNR
SUBM T1,T2 ;GET DIFFERENCE
ADDM T2,SUMNR ;ADJUST SUMNR
ADJWS1: STOR T1,FKWSS ;SET NEW VALUE
RET
;REMOVE FORK WORKING SET FROM MEMORY
;REMWSN - REMOVE WORKING SET WITHOUT POSTPURGING
REMWS: IFQN. BSWTB ;IF FORK IN BALSET WAIT,
CALL DISACC ;TERMINATE WAIT
LOAD T1,FKPTR,(FX)
CAIE T1,DISMT ;HDISMS?
IFSKP.
CALL DISMT2 ;YES, CLEAN UP
SOS NHOLDF ;ONE LESS HOLDING FORK
ELSE.
CAIE T1,PRELWT ;ENTERING?
CAIN T1,SWPINT
CALL SOSNEB ;YES, CLEAN UP
ENDIF.
ENDIF.
SKIPN POSPGF ;POSTPURGING?
IFSKP.
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL SWPINT ;(T1,FX) PSB AND UPT IN CORE?
ANSKP.
CALL WSSWPO ;YES, DO IT
SETOM LSTPFK ;NOTE PAGER CONTEXT INVALID
JRST REMBS7
ENDIF.
REMWSN: MOVSI 2,(-PLKV)
MOVSI T4,-NFKSPP ;UNLOCK ALL SPECIAL PAGES
REMBS6: XCT FKSPPT(T4) ;GET PAGE ID
HRRZ T1,SPT(T1) ;GET CORE ADDRESS
ADDM T2,@CST1X+T1 ;UNLOCK IT
AOBJN T4,REMBS6
REMBS7: LOAD T2,FKWSS ;GET CURRENT RESERVE
MOVN 1,2
ADDM 1,SUMNR ;REDUCE BALSET SIZE
SETZRO FKWSL ;WORKING SET NOT LOADED NOW
SOS NWSMEM
RET
;TABLE OF SPECIAL FORK PAGES
;EXECUTED BY LOADBS, REMBSJ, WSSWPO
FKSPPT::LOAD T1,FKPSB ;PSB
LOAD T1,FKUPT ;UPT
LOAD T1,FKJSB ;JSB
LOAD T1,FKPS2 ;SECOND PSB
IFDEF EHLJSB,<
LOAD T1,FKJPT ;PT of extended JSB
>
NFKSPP==:.-FKSPPT
;LOAD WORKING SET INTO MEMORY
LOADWS: MOVE T1,NRPLQ
CAIG T1,NFKSPP ;ENOUGH PAGES TO START LOAD?
RET ;NO
SAVEAC <P2>
LDJB3:: AOS NWSMEM ;COUNT NUMBER OF PROCESSES
SETONE <BSWTB,FKWSL> ;SET FLAGS, WS LOADED AND WAITING
SETZRO FKPTD,(FX) ;CLEAR TEST DATA
MOVEI 1,SWPINT
STOR 1,FKPTR,(FX) ;SET TEST TO WAIT FOR PSB AND PT
LOAD 1,FKWSS ;GET WORKING SET SIZE
LOAD 2,FKCSIZ ;PAGES NOW ASSIGNED
CAMGE 1,2 ;REASONABLE VALUES?
JRST FIXWSP ;NO
LDJB5: ADDM 1,SUMNR ;UPDATE SUM OF NR
SUB T1,T2 ;REDUCE RESERVE BY PAGES ALREADY ASSIGNED
SKIPN PRELDF ;PRELOADING?
MOVEI T1,NFKSPP ;NO, USE SMALL CONSTANT
STOR T1,FKNWCE ;SAVE PRELOAD RESERVE
ADDM T1,NRPMIN ;ADDITIONAL RESERVE FOR ENTERING FORKS
AOS NEBAL ;COUNT ENTERING PROCESSES
MOVSI P2,-NFKSPP ;SWAPIN ALL SPECIAL PAGES
LDJB1: XCT FKSPPT(P2)
CALL SWPIN0
AOBJN P2,LDJB1
AOS NWSLOD ;COUNT WS LOADS
AOS NBWT ;COUNT WAITING BALSET PROCESS
AOS NBSWP ;COUNT IS AS SWAP WAIT
MOVE T1,TODCLK ;SET START OF WAIT TIME
STOR T1,FKNB%,(FX)
SKIPN INSKED ;CHECK COMPLETION UNLESS NOT INSKED
SKIPN PRELDF ; AND PRELOADING
SKIPL FORKX ;CAN'T DO IT IF FORK CONTEXT SETUP
RETSKP
CALL SKDJ3
JFCL
RETSKP
;HANDLE BAD FKCSIZ - RECOMPUTE COUNT AND REPORT VALUES
FIXWSP: MOVE T4,MONCOR ;SETUP TO SCAN CST3
SETZ T2, ; TO COUNT ASSIGNED PAGES
FIXWS1: LOAD T1,CSTOFK,+T4 ;GET FORK ASSIGNMENT
CAMN T1,FX ;THIS FORK?
AOS T2 ;YES, COUNT
CAME T4,NHIPG ;SCANNED ALL PAGES
AOJA T4,FIXWS1 ;NO
LOAD T1,FKWSS ;GET EXISTING VALUES
LOAD T3,FKCSIZ
BUG.(CHK,FKWSP1,SCHED,HARD,<LOADBS-UNREASONABLE FKWSP>,<<T1,D>,<T2,D>,<T3,D>>,<
Cause: This BUG is not documented yet.
Action:
>)
STOR T2,FKCSIZ ;FIX COUNT
CAMGE T1,T2 ;NOW LOOKS OK?
MOVE T1,T2 ;NO, RESET FKWSS ALSO
STOR T1,FKWSS
JRST LDJB5 ;NOW...
;UPDATE QUEUE NUMBER AND TIME USED VALUE
SAVRT: EA.ENT ;RUN IN SECTION 1 BECAUSE OF TIMERS
CALL UCLOCK ;UPDATE CLOCKS
SETZ T1,
SKIPN T2,JOBBIT ;GET FORK PRIO IF ANY
MOVE T2,JOBSKD ;NONE GET JOB PRIO
TXNE T2,JP%SYS ;SYSTEM FORK?
TXO T1,BSSPQ ;YES
SKIPE NSKED ;NOSKED?
TXO T1,BSNSK ;YES
SKIPE CRSKED ;CSKED?
TXO T1,BSCRSK ;YES
OPSTR <XOR T1,>,FKSWX,(FX) ;COMPARE WITH LAST SETTING
TXNN T1,BSNSK!BSCRSK!BSSPQ ;CHANGED?
IFSKP.
ANDX T1,BSNSK!BSCRSK!BSSPQ
OPSTRM <XORM T1,>,FKSWX,(FX) ;YES, UPDATE VALUES
CALL GLREM ;CHANGE FORK POSITION ON GOLST
CALL GOCONC
ENDIF.
LOAD T1,FKSWX,(FX)
TMNN PIBMP ;ANY HIGH PRIORITY SCHED FLAGS?
TXNE T1,BSCRSK!BSSPQ
IFSKP.
TXZE T1,BSNST!BSOVRD ;NO, CLEAN UP IF NECESSARY
STOR T1,FKSWX,(FX)
ELSE.
MOVE T2,FACTSW ;YES, SYSTEM IN NORMAL OPERATION?
TXNN T2,SF%RMT!SF%LCL ;I.E. LOCAL OR REMOTE LOGINS ALLOWED?
TXZ T1,BSNST ;NO, DON'T START WATCHDOG
TXOE T1,BSNST ;YES, JUST HAPPENED?
IFSKP.
STOR T1,FKSWX,(FX) ;YES. UPDATE FLAG
MOVE T2,TODCLK ;INIT ALARM FOR 5 SECS
ADDI T2,^D5000
MOVEM T2,HPSWRN
ENDIF.
MOVE T2,TODCLK
CAMGE T2,HPSWRN ;TIME UP?
IFSKP.
ANDXE. T1,BSOVRD ;YES, NOT ALREADY NOTED?
MOVE T2,JOBNO ;YES, JOB PROBABLY STUCK
;This bugchk is intended to detect forks which are running with priority
;(e.g. JP%SYS, NOSKED, CRKSED, or even PIBUMP) and using too much time.
;This is useful to know because such cases impact response for all
;ordinary users. The bugchk reports
;the job and fork number of the offending fork. DLM 10/28/81
SKIPA
BUG.(CHK,HPSCHK,SCHED,SOFT,<SCHEDULER - EXCESSIVE TIME IN HIGH PRIORITY>,<<T2,JOBNO>,<FX,FRKNO>>,<
Cause: A fork has entered a high priority scheduling condition, i.e.
PIBMP, CSKED, or JP%SYS, and has remained compute-bound for more than
5 seconds. The fork has probably malfunctioned in some way, and
the high scheduling priority is affecting overall system response.
Action: The high priority status is disabled until the fork itself
clears the condition.
>)
SETONE BSOVRD ;OVERRIDE PRIORITY
CALL GLREM ;FIND NEW POSITION ON GOLST
CALL GOCONC
ENDIF.
ENDIF.
MOVE T1,FKT1 ;GET TIME USE SINCE SETRT
SETZM FKT1
LOAD T2,FKQN ;ACCUMULATE QUEUE DISTRIBUTION
ADDM T1,QSUM(T2) ; STATISTICS
MOVE T1,BSQNT ;GET REMAINING BALSET QUANTUM
SUB T1,BSQNT0 ;COMPUTE QUANTUM CHARGE THIS RUNNING
OPSTRM <ADDB T1,>,FKQTM ;UPDATE FORK QUANTUM
SKIPN T3,JOBBIT ;GET CONTROLLING WORD
MOVE T3,JOBSKD
LOAD T3,JP%MXQ,T3 ;CHECK MAXQ
CAIE T3,0 ;NON-0 AND EXCEEDED?
CAMGE T2,T3
JUMPG T1,[CAIG T2,MAXQ ;ON DREGS QUEUE
RET ;NO AND NOT EXHAUSTED, DONE
LOAD T3,FKMNQ ;DREGS, GET MIN QUEUE
CAMG T2,T3 ;SHOULD STILL BE DREGS?
RET ;YES AND NOT EXHAUSTED
JRST .+1] ;NO LONGER DREGS RECALC
AOS BSKED ;EXHAUSTED, REQUEST ADJUST OF BALSET
CALL GLREM ;REMOVE FROM GOLST WHILE CHANGING QUEUE
SAVR12: LOAD T2,FKQN ;GET Q NUMBER
SAVRT8: CAIGE 2,MAXQ ;NOW ON MAX Q?
AOSA T2 ;NO, GO TO NEXT ONE
MOVEI T2,MAXQ ;STAY ON MAXQ
SKIPN T4,JOBBIT ;SPECIAL PRIORITY?
SKIPE T4,JOBSKD ;ANY JOB-WIDE SCHEDULING CAPS?
IFNSK.
LOAD T3,JP%RTG,T4 ;GET RUNTIME GUARANTEE
SKIPN CLASSF ;IGNORE IF CLASS SCHEDULING
JUMPN T3,RTG1 ;CHECK IT IF SET
LOAD T3,JP%MNQ,T4 ;GET MIN QUEUE
CAMGE T2,T3 ;WITHIN RANGE?
MOVE T2,T3 ;NO, FIX
LOAD T3,JP%MXQ,T4 ;GET MAX QUEUE
ANDN. T3 ;IF SET...
CAML T2,T3 ;WITHIN RANGE?
MOVEI T2,-1(T3) ;NO, FIX
ENDIF.
SAVRT9: STOR 2,FKQN ;SET NEW QUEUE NUMBER
MOVE 1,QUANTT(2) ;GET QUANTUM FOR THIS QUEUE
RTG2: STOR 1,FKQTM ;SET NEW QUANTUM VALUE
MOVE 3,TODCLK
STOR 3,FKTIM,(FX) ;SET TIME ON QUEUE
CALLRET GOCONC ;NO. PUT FORK BACK ON GOLST
;DISMISS JOB FOR RESCHEDULING
DISMSJ: MOVE FX,FORKX
JUMPL FX,R ;NO JOB
CALL SAVRT ;UPDATE QUEUE AND QUANTUM
SETZ 1,
CALL SCHP2 ;SET BALSET WORD
RET
;ROUTINE USED BY LOADBS AND AJBALS TO CHECK IF A PROCESS SHOULD
;BE LOADED. IF A PRCESS IS "WAY AHEAD" OF ITS UTILIZATION,
;IT WILL NOT BE LOADED.
; FX/ FORK INDEX
;RETURNS: +1 NOT "WAY AHEAD"
; +2 "WAY AHEAD"
CKAHED: LOAD T1,FKQN ;GET QUEUE NUMBER OF PROCESS
JN <BSNSK,BSCRSK,BSSPQ>,,R ;IF CRITICAL OR SPECIAL PRIORITY DO IT
CAIG T1,INTQ1 ;NO, BUT INTERACTIVE OR SPECIAL?
RET ;NO. LOAD IT TO ALLOW AN INTERACTION
JN PIBMP,,R ;OR IF DOING PI, ALLOW IT
CALL DIST ;GET PROCESS'S DISTANCE
JUMPGE T1,R ;IF NOT AHEAD, LOAD IT
RETSKP ;IS AHEAD. DON'T LOAD IT
;RUNTIME GUARANTEE CONTROL - COMPUTE RUNTIME/ELAPSED, COMPARE WITH
;DESIGNATED CPU FRACTION. RAISE OR LOWER SCHEDULER PRIORITY AS
;NECESSARY.
; T4/ PRIORTY WORD
;LOWQT - CONTROLS INTERVAL OVER WHICH TIME IN GUARANTEED
LOWQT==^D10000
RTG1: LOAD T3,JP%RTG,T4 ;GET CPU RUN-TIME GUARANTEE
MOVE 1,JOBNO
SKIPN JOBCK0 ;GUARANTEE WORDS INIT'ED?
JRST [ MOVE 4,TODCLK ;INITIALIZE TIME QUARANTEE WORDS
MOVEM 4,JOBCK0
MOVE 4,JOBRT(1)
MOVEM 4,JOBCK1
JRST RTG3]
SAVRT7: JUMPE T3,SAVRT8 ;NOT SPECIAL
MOVE 4,JOBRT(1) ;COMPUTE RUNTIME DURING TEST INTERVAL
SUB 4,JOBCK1
MOVE 1,TODCLK ;COMPUTE REAL TIME OF TEST INTERVAL
SUB 1,JOBCK0
IMULI 4,^D100 ;COMPUTE RUNTM*100%/PCT TO GET
IDIV 4,T3 ;EXPECTED REAL TIME
SUB 4,1 ;EXCESS OR DEFICIT OF REAL TIME
CAIL 4,LOWQT/2 ;ACCUMULATED REASONABLE EXCESS?
JRST SAVRT5 ;YES, REDUCE PRIORITY
RTG3: IMUL T3,NBPROC ;GIVE BALSET QUANTUM PROPORTIONAL TO NBPROC
IMUL T3,SKDBQT ;AND DESIRED PERCENTAGE
IDIVI T3,^D100
MOVEI T2,INTQ0 ;KEEP ON A HIGH Q TO GET EXCLUSIVE TIME
JRST SAVRT9
;4 NOW CONTAINS TIME SUCH THAT AFTER THAT REAL-TIME INTERVAL,
;WITH NO RUNNING OF PROGRAM, ACTUAL PCT WILL EXACTLY EQUAL DESIRED PCT
SAVRT5: CAIGE 4,LOWQT ;ACCUMULATED EXCESS .GE. LOW-Q QUANT?
JRST [ CAIGE 2,MAXQ-1 ;NO, STILL ON HIGHER QUEUES?
JRST SAVRT8 ;YES, FOLLOW NORMAL ALGORITHM
MOVEI 2,MAXQ-1 ;STAY ON SECOND LOWEST QUEUE
JRST SAVRT9]
CAIGE 4,2*LOWQT ;ACCUMULATED LARGE EXCESS?
JRST SAVRT6 ;NO
SUBI 4,2*LOWQT ;YES, REMOVE EXCESS OVER 2*LOWQT
MOVN 4,4
ADDM 4,JOBCK0 ;FROM CONSIDERATION
MOVEI 4,2*LOWQT
SAVRT6: MOVEI 2,MAXQ ;PUT ON LOWEST QUEUE
STOR 2,FKQN ;SET QUEUE NUMBER
SAVR66: MOVE 1,QUANTT ;GIVE ONLY SHORT QUANTUM SO WILL RECHECK SOON
JRST RTG2
SUBTTL Miscellaneous global routines
;UPDATE USER CLOCKS ON REQUEST (MUST BE NOSKED OR INSKED)
UCLOCK::SKIPN INSKED ;NOW INSKED?
JRST [ PUSH P,T4 ;NO, READ CLOCK
JSP T4,MTIME
POP P,T4
JRST UCLOC3]
SKIPN FKT0 ;ALREADY DONE?
RET ;YES
MOVE T1,SKDLST ;TIME AT ENTRY TO SCHED
UCLOC3: SKIPN FKTOFF ;CLOCK NOW OFF?
IFSKP.
SUB T1,FKTOFF ;YES, COMPUTE TIME OFF
ADDM T1,FKTLST ;ACCUMULATE AS LOST
MOVE T1,FKTOFF ;USE TIME OFF AS END OF CHARGE INTERVAL
ENDIF.
SUBM T1,FKT0 ;COMPUTE INCREMENTAL RUNTIME
EXCH T1,FKT0 ;INIT NEW INTERVAL
SKIPE INSKED ;IF INSKED
SETZM FKT0 ;LEAVE FKT0 CLEAR
CAIGE T1,0 ;OVERFLOW?
ADD T1,BASOVV ;YES, CORRECT
MOVN 2,1
ADDM T2,BSQNT ;SUBTRACT TIME FROM QUANTUM
ADD 1,RUNT2 ;ACCUMULATE HIGH PRECISION TIME
IDIVI 1,NTMS ;CONVERT TO MS
MOVEM 2,RUNT2 ;RETAIN HIGH PRECISION UNITS
JUMPE 1,R ;RETURN IF NO CHANGE
ADDM T1,FKT1 ;ACCUMULATE RUNTIME SINCE SETRT
MOVE 2,JOBNO
SKIPGE JOBRT(T2) ;RUNTIME OK?
CALL [ BUG.(CHK,NEGJRT,SCHED,SOFT,<UCLOCK: NEGATIVE JOBRT DETECTED>,<<T2,JOBNO>>,<
Cause: The job runtime (JOBRT) is negative for an existing job. This
would cause the job to appear non-existant to most JSYSes.
Action: Use a reasonable value for JOBRT (0) and logout the job.
Data: T2/ Job number
>)
SETZM JOBRT(T2) ;QUICK FIX
SAVET
LOAD T2,JBTFK,(T2) ;NO, GET TOP FORK
MOVX T1,PSILO% ;FORCE LOGOUT ON IT
CALLRET PSIGR]
ADDM 1,JOBRT(T2) ;ACCOUNT FOR JOB
ADDM 1,FKRT ;ACCOUNT FOR FORK
ADDM T1,USRTIM ;ACCUMULATE TOTAL USER TIME
ADDM T1,@[EP. JOBIRT(T2)] ;ACCUMULATE JOB RUN-TIME AS WELL
HRRZ T3,@[EP. JOBCLS(T2)] ;GET CLASS OF THIS FORK
ADDM T1,@[EP. CLSIRT(T3)];AND ACCUMULATE HERE ALSO
JN JOBRTP,(2),UCLOC1 ; Do runtime limit exceeded check if one set
UCLOC2: HRRZ 2,JOBNAM(2) ;GET SUBSYSTEM INDEX
ADDM 1,@[EP. STIMES(2)] ;ACCUMULATE SUBSYSTEM TIME
RET
UCLOC1: LOAD 3,JOBRTP,(2) ; Get blk ptr
LOAD 3,TIMTIM,(3) ; Get limit
JUMPE 3,UCLOC2 ; Already done this stage?
CAML 3,JOBRT(2) ; Exceeded yet?
JRST UCLOC2 ; No, continue normally
LOAD 3,JOBRTP,(2) ; Once again retrieve blk ptr
SETZRO TIMTIM,(3) ; So we won't try to do it again
PUSH P,1 ; Save increment of time
MOVX 1,PSITL%
MOVE 2,FORKX
LOAD T2,FKJO%,(T2) ; First get job this fork belongs to
LOAD T2,JBTFK,(T2) ; then the top fork of the job
CALL PSIGR ; Start up the fork
POP P,1 ; Recover time increment
MOVE 2,JOBNO ; And job number
JRST UCLOC2 ; Done here, do the rest
;TURN FORK CPU TIME CLOCK OFF
FRTOFF::JSP T4,MTIME ;SAVE TIME AT WHICH CLOCK TURNED OFF
MOVEM T1,FKTOFF
RET
;TURN FORK CPU TIME CLOCK BACK ON
; RETURNS:
; 1/ CPU TIME THAT CLOCK WAS OFF IN HP UNITS
FRTON:: JSP T4,MTIME
SUB T1,FKTOFF ;COMPUTE TIME OFF
ADDM T1,FKTLST ;ACCUMULATE AS LOST TIME
ADDM T1,FKT0 ;ADJUST START OF PERIOD TO EXCLUDE LOST TIME
SETZB T1,FKTOFF ;NOTE CLOCK NOW ON
EXCH T1,FKTLST ;RETURN ACCUMULATED LOST TIME AND CLEAR
RET
;GET CURRENT FORK RUNTIME
GETFRT::NOSKED
;SKIPN T1,FKTOFF ;USE CLOCK OFF TIME IF PRESENT
JSP T4,MTIME ;READ CLOCK
SUB T1,FKT0 ;COMPUTE TIME SINCE LAST UPDATE
CAIGE T1,0 ;OVERFLOW?
ADD T1,BASOVV ;YES, CORRECT
ADD T1,RUNT2 ;ADD FRACTIONAL MS
IDIVI T1,NTMS ;CONVERT TO MS
ADD T1,FKRT ;ADD CURRENT TIME
OKSKED
RET
;GET CURRENT FORK RUNTIME IN HIGH PRECISION UNITS
GETHRT::NOSKED
;SKIPN T1,FKTOFF ;USE CLOCK OFF TIME IF PRESENT
JSP T4,MTIME ;READ CLOCK
SUB T1,FKT0 ;COMPUTE TIME SINCE LAST UPDATE
CAIGE T1,0 ;CHECK FOR OVERFLOW
ADD T1,BASOVV
ADD T1,RUNT2 ;ADD FRACTIONAL MS ACCUMULATED RUNTIME
MOVE T2,FKRT ;GET MS ACCUMULATED RUNTIME
IMULI T2,NTMS ;CONVERT TO HP UNITS
ADD T1,T2 ;COMPUTE SUM OF ACCUMULATED AND RECENT RUNTIME
OKSKED
RET
;PUT FORK ON WAIT LIST
WTCONC::MOVE 1,TODCLK ;SAVE TIME FORK WAS PUT INTO WAITING
STOR 1,FKPTX,(FX)
WTCON2: LOAD 1,FKSTR,(FX) ;CHECK FOR SPECIAL WAITS
CAIN 1,TCITST ;TTY INPUT?
JRST [ MOVEI 2,TTILST ;YES
JRST WTCON1]
CAIE T1,TCOTST ;TTY OUTPUT WAITS?
CAIN T1,TTOBET
SKIPA
CAIN T1,TTOAV
JRST [ MOVEI T2,TTOLST ;YES
JRST WTCON1]
CAIE T1,HALTT ;ANY OF VARIOUS HALTS?
CAIN T1,JRET
JRST WTCON3
CAIE T1,SUSWT
CAIN 1,FRZWT ;FREEZE?
WTCON3: JRST [ MOVEI T2,FHV1
STOR T2,FKGOLN ;SET WAIT PRIORITY
MOVEI 2,FRZLST
JRST WTCON1]
CAIE 1,TRMTS1
CAIN 1,TRMTST ;INFERIOR FORK WAIT?
JRST [ MOVEI 2,TRMLST
JRST WTCON1]
CAIE 1,BLOCKM
CAIN 1,BLOCKW ;CLOCKS?
SKIPA
CAIN 1,BLOCKT
JRST [ MOVEI 2,CLKLST
SETZM ALARMT ;FORCE RECHECK OF CLOCKS TO INCLUDE THIS
JRST WTCON1]
CAIN 1,PIDWAT ;IPCF?
JRST [ MOVEI 2,WT2LST ;YES, USE GENERAL PURPOSE LIST
JRST WTCON1]
MOVEI 2,WTLST ;ALL OTHER WAITS
WTCON1: STOR 2,FKWTL ;REMEMBER WHICH LIST
MOVEI 1,FKPT(FX) ;PUT FORK ON PROPER LIST
EXCH 1,0(2)
HRRM 1,FKPT(FX)
SETONE FKBLK ;NOTE BLOCKED
LOAD T2,FKSTR,(FX) ;NOW TRY TEST ONCE
LOAD T1,FKSTD,(FX)
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX)
IFSKP.
CALL UNBLK1 ;CONDITION ALREADY SATISFIED
ELSE.
TMNN FKPS0,(FX) ;TEST FAILED. IS INTERRUPT REQUESTED?
IFSKP.
TMNE FKPS1,(FX) ;YES. ARE INTERRUPTS DEFFERED?
ANSKP.
SETONE FKIWT,(FX) ;NO. FLAG INTERRUPT FROM WAIT STATE
CALL UNBLK1 ;AND WAKEUP FORK
ENDIF.
ENDIF.
RET
;MOVE FORK FROM ONE WAIT LIST TO ANOTHER. USED WHEN WAIT STATE
; CHANGES (E.G. FREEZE)
; FX/ FORK
RECONC::SAVEAC <Q2>
JE FKBLK,,UNBLK3 ;JUMP IF NOT BLOCKED
LOAD 1,FKWTL ;GET POINTER TO SPECIFIC LIST
RECON1: HRRZ Q2,0(1) ;SCAN FOR FORK
JUMPE Q2,UBBAD ;COULDN'T FIND IT
MOVEI 2,-FKPT(Q2) ;GET FOR INDEX
CAIE 2,0(FX) ;DESIRED FORK
JRST [ MOVEI 1,0(Q2) ;NO
JRST RECON1]
HRRZ 2,0(Q2) ;YES, REMOVE FROM CURRENT LIST
HRRM 2,0(1)
CALL WTCON2 ;PUT ON NEW LIST
JRST UNBLK3 ;RETURN
; CHKWT - Check if fork in FX is on wait list
CHKWT:: JE FKBLK,,R ;JUMP AND RETURN IF NOT BLOCKED
RETSKP ;SKIP IF BLOCKED
;CHKTOT - CALLED BY TTYSRV WHEN A TTY OUTPUT EVENT HAS OCCURED WHICH
;WILL LIKELY ALLOW A FORK TO WAKEUP
CHKTOT::AOS TSKED ;JUST FLAG FOR NEXT TCLKS
AOS PSKD1 ;WAKEUP FAST IF NULL JOB
RET
;UNBLOCK SPECIFIC FORK - MAY BE CALLED FROM OUTSIDE SCHEDULER
; 1/ FORK INDEX
; CALL UNBLKF
; RETURN +1 ALWAYS
UNBLKF::SAVEAC <FX>
EA.ENT
MOVEM 1,FX ;SETUP ARG
NOSKD1 ;NOSKED WHILE DIDDLING LISTS
JE FKBLK,,UNBF1 ;JUMP IF NOT BLOCKED
UNBF2: LOAD T2,FKSTR,(FX) ;GET TEST ROUTINE
LOAD T1,FKSTD,(FX) ;GET DATA FOR TEST ROUTINE
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX)
JRST UNBF1 ;NO, IGNORE CALL
CALL UNBLK1 ;DO THE WORK
UNBF1: OKSKD1
RET
;ROUTINE TO UNBLOCK SPECIFIC FORK
; FX/ FORK
UNBLK1::SAVEAC <Q2,F>
MOVE F,SCHFLG ;SETUP PERMANENT FLAGS
JE FKBLK,,UBBAD ;JUMP IF NOT BLOCKED
LOAD 1,FKWTL ;YES, GET POINTER TO IT
UNBLK2: HRRZ Q2,0(1) ;GET NEXT FORK ON LIST
JUMPE Q2,UBBAD ;COULDN'T FIND IT
MOVEI 2,-FKPT(Q2) ;GET INDEX FOR FORK
CAIE 2,0(FX) ;REQUESTED ONE?
JRST [ MOVEI 1,0(Q2) ;NO
JRST UNBLK2]
HRRZ 2,0(Q2) ;REMOVE FORK FROM LIST
HRRM 2,0(1)
CALL SCHEDJ ;ADJUST QUEUE AND PUT ON GOLST
UNBLK3: RET
UBBAD: BUG.(CHK,UNBFNF,SCHED,HARD,<UNBLK1 - FORK NOT FOUND>,,<
Cause: This BUG is not documented yet.
Action:
>)
JRST UNBLK3
;WAKEUP SUPERIOR, E.G. ON FORK SUSPENSION
; T1/ TEST ADR - WAKEUP ONLY IF THIS TEST
; CALL WAKSUP
WAKSUP: SAVEAC <FX>
MOVE T2,T1
HRRZ T1,FORKN ;GET SUPERIOR
JUMPE T1,R ;RETURN IF TOP FORK
ADD T1,SUPERP
LDB T1,T1
HRRZ FX,SYSFK(T1)
JE FKBLK,,R ;RETURN IF NOT BLOCKED
OPSTR <CAME T2,>,FKSTR,(FX) ;IS SCHEDULER TEST THE ONE WE WANT?
RET ;NO, DON'T WAKE
CALLRET UNBLK1 ;WAKE IT
;SPECIAL ROUTINE CALLED FROM NSPSRV TO UNBLOCK A PROCESS IF
;NECESSARY. ACCEPTS:
; T1/ FORK INDEX
; T2/ LOW ADDRESS FOR SCHEDULER TESTS
; T3/ HIGH ADDRESS
;THIS ROUTINE CHECKS IF PROCESS IS ON WAIT LIST AND IS WAITING
;ON ONE OF THE SPECIFIED ROUTINES
NETWKF::MOVE T3,T2 ;SET UP RANGE TEST
NETWK1::SAVEAC <FX>
MOVE FX,T1 ;GET FORK # INTO FX
NOSKD1 ;PREVENT STATE CHANGES
JE FKBLK,,UNBF1 ;JUMP IF NOT BLOCKED
LOAD T1,FKSTR,(FX) ;YES. GET WAIT ROUTINE
CAML T1,T2 ;WITHIN RANGE?
CAMLE T1,T3 ;STILL?
JRST UNBF1 ;NO. DON'T WAKE IT
JRST UNBF2 ;YES. WAKE IT
;CHECK CLOCK LIST. WAKEUP ANY FORKS HAVING EXPIRED TIMES AND
; COMPUTE TIME FOR NEXT CHECK
CLKCHK: SAVEQ
MOVE 1,TODCLK
CAMGE 1,ALARMT ;TIME FOR CHECK NOW?
RET ;NO
MOVSI 1,(1B1) ;YES, INIT TO FIND MIN VALUE
MOVEM 1,ALARMT
MOVEI 5,CLKLST
CLKCH1: HRRZ Q2,0(Q1) ;GET NEXT FORK
JUMPE Q2,R
MOVEI FX,-FKPT(Q2) ;GET FORK INDEX
LOAD T2,FKSTR,(FX) ;GET SCHEDULER TEST ROUTINE
LOAD T1,FKSTD,(FX) ;GET TEST ROUTINE DATA
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX)
JRST [ ADD 1,TODCLK ;FAILS, RETURNS NUMBER OF MS REMAINING
CAMGE 1,ALARMT ;THIS SOONER THAN SOONEST SO FAR?
MOVEM 1,ALARMT ;YES
MOVEI Q1,0(Q2)
JRST CLKCH1]
HRRZ 2,0(Q2) ;REMOVE FORK FROM LIST
HRRM 2,0(Q1)
CALL SCHEDJ ;WAKEUP THE FORK
JRST CLKCH1
;CHECK SUPERIOR ON FORK TERMINATION
;SUPERIOR FORK INDEX LEFT IN LH OF DISMISS TEST WORD
;OR ENTER AT SUPUB0 WITH FORKX INDEX IN 1
SUPUNB: STKVAR <SUPFX>
MOVEM FX,SUPFX ;SAVE CURRENT
LOAD FX,FKSTD,(FX) ;GET SUPERIOR FORK INDEX
JE FKBLK,,SUPUX ;JUMP IF SUPERIOR NOT BLOCKED
LOAD 1,FKWTL ;SEE WHERE IT IS
CAIE 1,TRMLST ;WAITING FOR TERMINATION?
JRST SUPUX ;NO
LOAD T2,FKSTR,(FX) ;YES. GET SCHEDULER TEST
CAIN 2,TRMTS1 ;WAITING FOR ANY FORK?
JRST SUPU1 ;YES, WAKE IT
LOAD T2,FKSTD,(FX) ;NO, SPECIFIC FORK.
CAMN 2,SUPFX ;WAITING FOR THIS ONE?
SUPU1: CALL UNBLK1 ;YES, WAKE IT
SUPUX: MOVE FX,SUPFX ;RESTORE SELF
SKIPE PRIMRY ;IS THIS IN FORK INIT?
CALL FKTMI ;NO. GENERATE INTERRUPT THEN
RET
SUPUB0::MOVEI T1,TRMINT ;GET CHANNEL FOR FORK TERMINATION
MOVE T2,FORKX ;TO SELF
CALL PSIRQ ;GO REQUEST INTERRUPT
CHKINT ;AND MAKE IT HAPPEN
RET ;AND DONE
;WTCHK - TEST ALL NON-SPECIAL WAITING FORKS
;CHKTL - TEST TTY OUTPUT FORKS
WTCHK:: MOVEI T1,^D300 ;SET TIME FOR NEXT CHECK
MOVEM T1,WTTIM
MOVEI Q2,WTLST ;HEAD OF WAITING LIST
CALL SCHEDA
CHKTL: MOVEI Q2,TTOLST ;TTY OUTPUT LIST
SETZM TSKED
SCHEDA: MOVEI Q1,0(Q2) ;KEEP POINTER TO LAST ONE IN Q1,
SCHEDB: HRRZ Q2,0(Q1) ;POINTER TO CURRENT ONE IN Q2
JUMPE Q2,R ;DONE
MOVEI FX,-FKPT(Q2) ;FORK INDEX
LOAD T2,FKSTR,(FX) ;GET TEST ROUTINE
LOAD T1,FKSTD,(FX) ;GET DATA FOR TEST ROUTINE
XMOVEI T4,JSPRET ;DUMMY FOR OLD JSP TESTS
CALL 0(T2) ;(T1,FX)
JRST SCHEDA ;NO SKIP = STILL NOT RUNNABLE
HRRZ 2,0(Q2) ;REMOVE FROM WAIT LIST
HRRM 2,0(Q1)
CALL SCHEDJ ;SETUP QUEUE AND GOLST
JRST SCHEDB
;DO WAKEUP ON FORK - SET NEW STATUS AND PUT ON GOLST
SCHEDJ: AOS TTYBKS ;NOW RUNNABLE, COUNT UNBLOCKS
SETZRO FKBLK
CALL NEWST ;ESTABLISH NEW QUEUE STATUS
CALL GOCONC ;PUT ON READY LIST
CALL APSKED ;SEE IF RESCHEDULE NEEDED
CALLRET CHKTFK ;PUT FORK INTO BALSET IF POSSIBLE
;UPON RECEIPT OF WAKEUP EVENT FOR FORK, SEE IF RESCHEDULING SHOULD
;OCCUR TO RUN UNBLOCKED FORK RATHER THAN CURRENT FORK
; FX/ FORK INDEX
; CALL APSKED
; RETURN +1 ALWAYS, ALL ACS PRESERVED
APSKED::JE SK%RSQ,SCHFLG,APSK1 ;SYSTEM MGR WANTS THIS?
SKIPL FORKX ;HAVE A CURRENT FORK?
SKIPE INSKED ;ALREADY IN SCHEDULER?
JRST APSK1 ;NO OR YES - NO NEED TO INTERRUPT
CAIL FX,NFKS
JRST APSK1 ;NOT A VALID FORK
SAVEAC <T1,T2,FX> ;SAVE SOME ACS
;*** THIS CHECK IS SLIGHTLY BOGUS SINCE QUEUE NUMBER DOES NOT ALWAYS
;*** INDICATE CORRECT PRIORITY!
LOAD T1,FKQN ;GET QUEUE NUMBER OF NEW FORK
MOVE FX,FORKX
LOAD T2,FKQN ;GET QUEUE NUMBER OF CURRENT FORK
CAMLE T1,T2 ;NEW BETTER THAN CURRENT?
JRST APSK1 ;NO, DO NOTHING
AOS SKEDF3 ;YES, REQUEST RESCHED
AOS PSKED
ISB SCDCHN ;RIGHT NOW
RET
APSK1: AOS PSKD1 ;FLAG POSSIBLE SCHEDULING EVENT
RET
;PUT FORK ON GO LIST. LIST IS KEPT IN PRIORITY ORDER; SEARCH
; DOWN LIST UNTIL FORK OF LOWER PRIORITY IF FOUND. PUT NEW FORK
; JUST AHEAD OF THAT ONE.
GOCONC: SAVEAC <Q2>
CALL ONGOL ;PUT ON GO LIST
AOS NGOJOB ;KEEP COUNT OF READY JOBS
LOAD T3,FKJBN ;GET JOB #
MOVSI CX,1 ;GET AN INCREMENTOR
ADDB CX,@[EP. JOBCLS(T3)] ;ONE MORE ON GOLST
TLNE CX,777776 ;FIRST ONE ON?
JRST GOCNC0 ;NO.
HRRZ T3,@[EP. JOBCLS(T3)] ;GET CLASS
INCR CLGLC,(T3) ;ONE MORE ON GOLST
GOCNC0: LOAD T3,FKQN ;UPDATE QUEUE COUNTS
CAIGE T3,MAXQ
AOSA NHQFK
AOS NLQFK
RET
;ROUTINE TO DO THE WORK.
ONGOL: STKVAR <SFX,SP1,SP2>
MOVEM FX,SFX ;SAVE FORK INDEX
CALL CORFCT ;COMPUTE PRIORITY
MOVEM T1,SP1
MOVEM T2,SP2 ;SAVE PRIORITIES
MOVEI T3,GOLST
GOC1: HRRZ T4,0(T3) ;GET NEXT FORK ON LIST
JUMPE T4,ONGOL0 ;END OF LIST?
MOVEI FX,-FKPT(T4) ;GET FORK INDEX (.. -FKPT(T4) )
CALL CORFCT ;GET PRIORITY OF THIS FORK
CAMG T1,SP1 ;BETTER THAN CLASS TO BE ADDED?
JRST GOC2 ;NO. TEST FOR INSET HERE
ONGOL1: MOVEI T3,0(T4) ;YES. KEEP SCANNING
JRST GOC1
;FOUND BEGINNING OF CLASS STUFF. NOW FIND PROPER PLACE
GOC2: CAMN T1,SP1 ;SAME CLASS?
CAMGE T2,SP2 ;YES. BELONG HERE?
JRST ONGOL0 ;YES. DO IT
JRST ONGOL1 ;NO. KEEP GOING THEN
ONGOL0: MOVE FX,SFX ;GET ORIGINAL INDEX
MOVEI T1,FKPT(FX) ;PUT FORK INTO LIST
HRRM T1,0(T3) ;LINK TO PREVIOUS
HRRM T4,FKPT(FX)
SETONE FKOGL ;MARK ON GOLST
RET ;DONE
;REMOVE SELECTED FORK FROM GOLST
; FX/ fork index
GLREM: SAVEQ
JE FKOGL,,GLREM2 ;IF NOT MARKED ON GOLST DIE
HRRZ Q1,FX ;GET FORK INDEX FOR COMPARING
MOVEI 1,GOLST
GLREM1: HRRZ Q2,0(1)
JUMPE Q2,GLREM2
MOVEI FX,-FKPT(Q2) ;GET FORK INDEX
CAME FX,Q1 ;DESIRED ONE?
JRST [ MOVEI 1,0(Q2) ;NO
JRST GLREM1]
HRRZ Q2,FKPT(FX) ;YES, REMOVE FROM LIST
HRRM Q2,0(1)
SOS NGOJOB
LOAD Q1,FKJBN ;GET JOB NUMBER
MOVSI CX,-1 ;GET A DECREMNTOR
ADDB CX,@[EP. JOBCLS(Q1)] ;DO IT
TLNE CX,-1 ;LAST ONE OFF?
JRST GLREM0 ;NO
HRRZ Q1,@[EP. JOBCLS(Q1)] ;GET CLASS NUMBER
DECR CLGLC,(Q1) ;ONE LESS ON GOLST
GLREM0: LOAD Q1,FKQN ;UPDATE QUEUE COUNTS
CAIGE Q1,MAXQ
SOSA NHQFK
SOS NLQFK
SETZRO FKOGL ;NO LONGER ON GOLST
RET
GLREM2: BUG.(HLT,GLFNF,SCHED,HARD,< GLREM - FORK NOT FOUND>,,<
Cause: The scheduler is trying to remove a process from its linked list of
runnable processes (the GOLIST). The BUGHLT occurs because the
scheduler does not find the process in the GOLIST. This indicates an
inconsistency in the scheduler's data base.
>)
;DUMMY RETURNS FOR ROUTINES CALLED WITH 'CALL' BUT ACT AS IF THEY
;WERE CALLED WITH JSP T4,. T4 IS SETUP TO CONTAIN JSPRET.
JRET::
JSPRET::RET ;THROUGH HERE ON JRST 0(T4)
JSKP:: AOS 0(P) ;THROUGH HERE ON JRST 1(T4)
RET
;wait bit routine - dismiss until bit becomes 0 or 1
;CALL BITWAI
;T1/ test bit set
;T2/ address of test word
;T3/ test value
; 0 means dismiss until bit becomes 0
; nonzero means dismiss until bit becomes 1
;returns +1 eventually, uses T1-T3, preserves all others
;returns +1 immediately if T1=0
BITWAI::SAVEAC <T4>
MOVE T4,FORKX ;get fork index
STOR T2,FKST2,(T4) ;additional datum - address of word to test
JFFO T1,BITWA1 ;get bit number
RET ;no bit to test, return
BITWA1: HRL T1,T2 ;bit number in LH (data)
SKIPN T3 ;waiting for bit to be set ?
IFSKP.
HRRI T1,BITSET ;yes. address of test routine
ELSE.
HRRI T1,BITCLR ;no. address of test routine
ENDIF.
MDISMS
RET
;Test routine - waiting for a bit to be cleared
;FX/ fork index
;preserves all ACs
BITCLR::SAVEAC <T1,T2>
LOAD T1,FKSTD,(FX) ;get bit number
LOAD T2,FK2DT ;get test word
TDNN T2,BITS(T1) ;is that bit of that word set ?
RETSKP ;no. wait no more.
RET ;yes. wait some more
;Test routine - waiting for a bit to be set
;FX/ fork index
;preserves all ACs
BITSET::SAVEAC <T1,T2>
LOAD T1,FKSTD,(FX) ;get bit number
LOAD T2,FK2DT ;get test word
TDNN T2,BITS(T1) ;is that bit of that word set ?
RET ;no. wait some more.
RETSKP ;yes. wait no more.
;COMPUTE PRIORITY NUMBER FOR FORK
; FX/ FORK INDEX
; CALL CORFCT
; RETURNS +1, T1/ FIRST SORT KEY
; T2/ SECOND SORT KEY
CORFCT: LOAD T2,FKQN ;GET QUEUE NUMBER
SKIPE CLASSF ;CLASS SCHEDULING?
JRST CORFC1 ;YES
CORFCO: MOVE T1,TODCLK ;NO, ORDER FORKS BY QUEUE NUMBER
OPSTR <SUB T1,>,FKTIM,(FX) ; AND THEN ELAPSED TIME ON QUEUE
JUMPL T1,CORFC2 ;RETURN NEG IF NOT DUE TO RUN YET
ADD T1,TBASE(T2) ;ADD QUEUE OFFSET
CORFC2: LOAD T2,FKSWX,(FX) ;CHECK FLAGS
TXNE T2,BSNSK ;NOSKED?
ADD T1,NSKBAS ;YES, PRIORITY
TXNE T2,BSOVRD ;PRIORITY OVERRIDE?
IFSKP.
TMNN PIBMP ;IF PI'ING, GIVE PRIORITY
TXNE T2,BSCRSK ;CRITICAL SECTION?
SKIPA
TXNE T2,BSSPQ ;OR SPECIAL SYSTEM FORK?
ADD T1,CSKBAS ;YES, SECOND PRIORITY
ENDIF.
MOVEI T2,0 ;NO SECOND KEY HERE
RET
;THE CLASS SCHEDULER IS ON. THE COMPUTED PRIORITY IS AS FOLLOWS:
; T1/ CLASS DISTANCE+MODIFIER
; OR T1/ SPECIAL VALUE
;WHERE THE SPECIALS ARE:
; 6.0 IF NOSKED
; 4.0 IF Q 0
; IF Q1 OR PI BOOST OR CRSKED OR SPECIAL SYSTEM FORK,
; 3.0 + VALUE (0 TO 1) FOR LENGTH OF TIME ON PRESENT QUEUE
;HOWEVER, IF THE CLASS IS PRESENTLY USING WINDFALL, Q1 PROCESSES
;RECEIVE CSLDST+.05 AS THE PRIORITY
;MODIFIERS IF NON-SPECIAL
; 0.5 IF ON INTQ1 AND CLASS NOT USING WINDFALL
; T2/ JOB DISTANCE + MODIFIER
;WHERE THESE MODIFERS ARE:
; 0.1(1-Q/LOWQ)
;OR T2/ Q NUMBER
; IF PROCESS IS SPECIAL
CORFC1: SAVEAC<T3,T4>
JN BSNSK,,CORFC4 ;NOSKED?
JUMPE T2,[MOVX T1,<4.0> ;NO. IF QUEUE 0, DO IT
JRST CORFC7]
CAIG T2,INTQ0 ;INTERACTIVE PROCESS?
JRST CORFC5 ;YES. GO HANDLE IT
CALL DIST ;GET DISTANCES
CORFC3: TMNN SK%CL1,SCHFLG ;USING QUEUES OR DISTANCES?
IFNSK. ;IF QUEUES
PUSH P,T1 ;SAVE CURRENT CLASS DIST
LOAD T2,FKQN ;GET QUEUE
CALL CORFCO ;DO OTHER COMPUTATION
MOVE T2,T1 ;RETURN RESULT AS JOB DISTANCE
POP P,T1 ;RECOVER CALL DIST
LOAD CX,FKQN
ELSE. ;IF DISTANCES
LOAD CX,FKQN ;GET Q VALUE AGAIN
FADR T2,LQWBAS-INTQ1(CX) ;ATTENUATE JOB DISTANCE
ENDIF.
IFGE. T1
CAIG CX,INTQ1 ;INTERACTIVE QUEUES?
FADRI T1,(EXP 0.5) ;YES. ATTENUATE CLASS DISTANCE SUCH
; THAT A WELL-BEHAVED CLASS WILL
; ACHIEVE PRIORITY ON THIS QUEUE
ENDIF.
LOAD T3,FKSWX,(FX) ; GET FLAGS AGAIN
TXNE T3,BSOVRD ;OVERRIDDEN?
IFSKP.
TMNN PIBMP
TXNE T3,BSSPQ!BSCRSK ;NO SPECIAL?
IFNSK.
CAMGE T1,[0.5] ;MAKE SURE ADEQUATELY BOOSTED
MOVX T1,<0.5> ;IF NOT, HELP IT OUT SOME, BUT NOT TO
; THE DETRIMENT OF WELL-BEHAVED QUEUE 2
; PROCESSES
ENDIF.
ENDIF.
RET ;AND DONE
;NEED SPECIAL PRIORITY
CORFC8: SKIPA T1,[3.0] ;AHEAD OF ALL COMPUTE BOUND FORKS
CORFC4: MOVX T1,<6.0> ;FOR NOSKED
;The following computes a value which increases from 0 to 1 as
;the length of time on the present queue. This provides a
;round-robin among forks with otherwise equal high priority.
;The computation is N/(N+C) where N is the length of time
;on the queue and C is a constant.
CORFC7: MOVE T2,TODCLK
OPSTR <SUB T2,>,FKTIM,(FX) ;TIME ON QUEUE
FLTR T2,T2
MOVE T4,T2
FADRI T4,(4096.0) ;AN ARBITRARY CONSTANT
FDVR T2,T4
RET ;AND DONE
;GET JOB DIST ONLY, PRESERVE CLASS DIST IN T1
CORFC6: SAVEAC <T1> ;KEEP THE CLASS DIST WE HAVE
CALL DIST ;GET THE JOB DIST
RET ;RETURN THOSE TWO
;PROCESS IS ON QUEUE 1 AND CLASS SCHEDULER IS ON
CORFC5: CALL DIST
SKIPL CLASSF ;WITHHOLDING?
SKIPL T1 ;IN WINDFALL?
JRST CORFC8 ;WITHHOLDING OFF OR NOT IN WINDFALL, BOOST
FADRI T1,(0.5) ;IN WINDFALL AND WITHHOLDING, SMALL BOOST
RET ; AND USE PRESENT VALUES
;COMPUTE NEW UTILIZATION FOR ALL CLASSES.
;COMPUTATION PERFORMED IS:
; U(I+1)=U(I)*e^-(T/C)+F(1-e^(T/C))
;WHERE:
; U(I)=PREVIOUS UTILIZATION
; U(I+1)= NEWLY COMPUTED UTILIZATION
; T/C= 1/20 (TIME CONSTANT OF 60 SEC, COMPUTED EVERY 3 SEC)
; F= FRACTIONAL UTILIZTION IN INTERVAL. COMPUTE AS:
; CLSIRT/TIME WHERE:
; TIME = SELLABLE TIME = (SOLD TIME + IDLE TIME)
NEWUTL: ACVAR <W1,W2,W3> ;GET A WORK REG
MOVE W2,USRTIM ;GET CURRENT USER TIME
SUBM W2,OLDSLD ;COMPUTE TIME SOLD IN INTERVAL
EXCH W2,OLDSLD ;START NEW INTERVAL
MOVE T1,SKDIDL ;GET IDLE TIME (HP UNITS)
SUBM T1,OLDIDL ;COMPUTE IDLE TIME USED IN INTERVAL
EXCH T1,OLDIDL ;AND START NEW INTERVAL
IDIVI T1,NTMS ;CONVERT TO MILLISECONDS
ADD W2,T1 ;TIME = SOLD + IDLE
FLTR W2,W2 ;GET FLOAT OF INTERVAL
JFOV .+1 ;INIT OVERFLOW FLAG
SKIPN CLASSF ;CLASS SCHEDULING ON?
JRST NEWUTJ ;NO, ONLY DO JOB UTILS
MOVEI W1,MAXCLS-1 ;SET UP TO COMPUTE CLASS UTILS
NEWUT0: SKIPN T3,@[EP. CLSIRT(W1)];ANY TIME IN THIS INTERVAL?
JRST NEWUT1 ;NO. PROCEED
SETZM @[EP. CLSIRT(W1)] ;CLEAR COUNTER
FLTR T3,T3 ;FLOAT THE VALUE
FDVR T3,W2 ;COMPUTE FRACTIONAL USE
NEWUT1: MOVE T1,@[EP. CLSUTL(W1)] ;GET CLASS UTIL
FSBR T1,T3
FMPR T1,UTLEXP+UTLINI-1 ;DECAY IT
JFOV [ SETZM T1 ;YES. ASSUME UNDERFLOW THEN
JRST .+1]
FADR T1,T3 ;NEW UTIL
MOVEM T1,@[EP. CLSUTL(W1)]
FSBR T1,@[EP. CLSSHR(W1)] ;COMPUTE LINEAR DISTANCE
SKIPL T1 ;WINDFALL?
SKIPGE T3,@[EP. CLSSWA(W1)] ;YES. ANY WINDFALL ALLOCATION?
MOVE T3,@[EP. CLSSHR(W1)] ;NO. USE NORMAL SHARE THEN
FDVR T1,T3 ;COMPUTE DISTANCE
JFOV [ SKIPE T3 ;ANY SHARE?
TDZA T1,T1 ;YES. ASSUME ON TARGET THEN
FADRI T1,(MXBIAS) ;NO. MAKE SURE IS RUN LAST THEN
JRST .+1] ;PROCEED
MOVNM T1,@[EP. CLSDST(W1)] ;SAVE DISTANCE
SOJGE W1,NEWUT0 ;DO ALL CLASSES
; ..
;NEWUTL CONTINUED...
;COMPUTE JOB UTILS AND DISTANCES
NEWUTJ: MOVE W1,MJBUSE ;GET HIGHEST JOB IN USE
NEWU00: SKIPGE JOBRT(W1) ;THIS JOB IN USE?
JRST NEWU02 ;NO. SKIP IT THEN
SKIPN T3,@[EP. JOBIRT(W1)] ;THIS JOB HAVE SOME RUN-TIME?
JRST NEWU01 ;NO
SETZM @[EP. JOBIRT(W1)] ;YES. CLEAR COUNTER
FLTR T3,T3 ;GET FLOAT OF TIME
FDVR T3,W2 ;GET FRACTION
NEWU01: MOVE T1,@[EP. JOBUTL(W1)] ;GET CURRENT JOB UTILIZATON
FSBR T1,T3
FMPR T1,UTLEXP+UTLINI-1 ;DECAY IT
JFOV [ SETZM T1
JRST .+1]
FADR T1,T3 ;NEW UTIL
MOVEM T1,@[EP. JOBUTL(W1)] ;SAVE IT
HRRZ T2,@[EP. JOBCLS(W1)] ;GET CLASS
MOVE T3,@[EP. CLSSHI(T2)] ;GET JOB'S SHARE
FSBR T3,T1 ;COMPUTE LINEAR DIFFERENCE
FDVR T3,@[EP. CLSSHI(T2)] ;COMPUTE "EXPONENTIAL DIFFERENCE
JFOV [ SKIPE @[EP. CLSSHI(T2)] ;ANY SHARE?
SETZM T3 ;NO. ASSUME ON TARGET THEN
JRST .+1]
MOVEM T3,@[EP. JOBDST(W1)] ;SAVE JOB DISTANCE
NEWU02: SOJGE W1,NEWU00 ;DO ALL JOBS
MOVE T1,TODCLK ;GET NOW
ADD T1,UTLINT ;WHEN TO DO IT NEXT
MOVEM T1,UTLTIM ;""
;REORDER GOLST
MOVE W1,GOLST ;GET GOLST
SETZM GOLST ;INIT IT TO EMPTY
REORDR: JUMPE W1,R ;IF EMPTY NOW, ALL DONE
MOVEI FX,-FKPT(W1) ;GET FORK INDEX
HRRZ W1,FKPT(FX) ;GET NEXT ITEM
CALL ONGOL ;INSERT IN NEW GOLST
JRST REORDR ;AND PROCEED
ENDAV. ;END ACVAR
;COMPUTE CURRENT DISTANCE FROM TARGET UTIL FOR PROCESS
;FX/ FORK HANDLE
;RETURNS: T1/ DISTANCE FROM CLASS TARGET UTILIZATION (IN %)
; T2/ DISTNCE FROM JOB TARGET UTIL (IN %)
;CLOBBERS ONLY T1 AND T2
DIST: LOAD T2,FKJBN ;GET JOB NUMBER
HRRZ T1,@[EP. JOBCLS(T2)] ;GET JOB CLASS
MOVE T1,@[EP. CLSDST(T1)] ;GET CLASS DISTANCE
MOVE T2,@[EP. JOBDST(T2)] ;GET JOB DISTANCE
RET ;DONE
;MORE CLASS SCHEDULING PARAMETERS.
;ROUTINES TO MAINTAIN SHARE COUNTS
;ADD A MEMBER TO A CLASS
; T1/ CLASS
REPEAT 0,< ;NOT BEING USED NOW
DECSHR: SOSA @[EP. CLSCNT(T1)] ;ONE LESS ITEM
INCSHR: AOS @[EP. CLSCNT(T1)] ;ONE MORE ITEM
SKIPE CLASSF ;DOING CLASS SCHEDULING?
CALL ADJCLS ;YES. ADJUST CLASS PARAMETERS
RET ;ALL DONE THEN
> ;END OF REPEAT 0
;ROUTINE TO START UP CLASS SCHEDULING
STRCLS: SKIPE CLASSF ;NOW ON?
RET ;YES. NO NEED THEN
ACVAR <W1>
SETOM CLASSF ;START IT UP
REPEAT 0,< ;DON'T NEED THIS BECAUSE NEWUTL ALWAYS ON
MOVEI W1,NJOBS-1 ;SCAN JOBS
STRCL0: SETZM @[EP. JOBIRT(W1)] ;NO INCREMENTAL RUN-TIME YET
SETZM @[EP. JOBUTL(W1)] ;NO UTIL
SOJGE W1,STRCL0 ;DO ALL JOBS
MOVE T1,USRTIM ;GET CURRENT "SOLD" TIME
MOVEM T1,OLDSLD ;INIT INTERVAL
>
MOVEI T1,0
DO.
SETZM @[EP. CLSIRT(T1)]
SETZM @[EP. CLSSUM(T1)]
SETZM @[EP. CLSCNT(T1)] ;CLEAR COUNTS AS WELL
CAIGE T1,MAXCLS-1
AOJA T1,TOP.
ENDDO.
MOVEI T1,0
DO.
SETZM @[EP. CLSRJA(T1)]
CAIGE T1,MAXCLS*NRJAVS-1
AOJA T1,TOP.
ENDDO.
CALL COUNT ;GET CORRECT CLASS COUNTS
RET
ENDAV. ;END ACVAR
;ROUTINES TO COMPUTE CLASS PARAMETERS
;FIRST. COMPUTE ALL CLSCNT VALUES BY SCANNING GOLST
COUNT: SAVEAC <FX> ;SAVE REG
MOVEI T4,NJOBS-1 ;SCAN ALL JOBS
COUNT0: SKIPGE JOBRT(T4) ;THIS JOB ACTIVE?
JRST COUNT4 ;NO
HRRZS T2,@[EP. JOBCLS(T4)] ;YES. GET CLASS
AOS @[EP. CLSCNT(T2)] ;INCREMENT COUNT
COUNT4: SOJGE T4,COUNT0 ;DO ALL JOBS
COUNT1: MOVEI T1,MAXCLS-1
COUNT2: SKIPE @[EP. CLSCNT(T1)] ;ANYBODY IN THIS CLASS?
CALL ADJCLS ;YES. DO COMPUTING THEN
SOJGE T1,COUNT2
;NOW COMPUTE ON GOLST COUNT
HRRZ T1,GOLST ;GET TOP ENTRY OF GOLST
COUNT5: JUMPE T1,R ;IF AT THE END, DONE
MOVEI FX,-FKPT(T1) ;GET FORK INDEX
LOAD T2,FKJBN ;GET JOB NUMBER
MOVSI CX,1 ;AN INCREMENTOR
ADDB CX,@[EP. JOBCLS(T2)] ;ONE MORE ON GOLST
TLNE CX,777776 ;FIRST ONE?
JRST COUNT6 ;NO
HRRZ T2,@[EP. JOBCLS(T2)] ;GET CLASS
INCR CLGLC,(T2) ;INCREMENT COUNT
COUNT6: HRRZ T1,FKPT(FX) ;GET NEXT FORK
JRST COUNT5 ;AND STEP
;ADJUST GOLST COUNTS WHEN A JOB CHANGES CLASSES
; T1/ OLD CLASS
; T2/ JOB #
CHGCNT: SAVEAC <FX> ;SAVE A REG
HRRZ T4,@[EP. JOBCLS(T2)] ;GET NEW CLASS
SKIPN FX,GOLST ;ANYTHING ON GOLST?
RET ;NO
CHGCN0: SUBI FX,FKPT ;GET FORK #
LOAD T3,FKJBN ;GET JOB #
CAIE T3,0(T2) ;SAME AS TARGET?
JRST CHGCNX ;NO
DECR CLGLC,(T1) ;YES. ONE LESS IN OLD CLASS
INCR CLGLC,(T4) ;AND ONE MORE IN NEW CLASS
RET
CHGCNX: HRRZ FX,FKPT(FX) ;GET NEXT ITEM
JUMPN FX,CHGCN0 ;DO IT
RET ;ALL DONE
;ROUTINE TO CHANGE CLASS FOR A JOB.
; T1/ NEW CLASS
; T2/ JOB NUMBER
;MUST BE IN THE SCHEDULER
CHGCLS: SASUBR <NCLASS,JOBNOM>
CAMN T2,JOBNO ;THIS JOB?
CALL [ SAVET ;YES
CALLRET UCLOCK] ;UPDATE CLOCKS
SKIPGE JOBRT(T2) ;HAS JOB LOGGED OUT
RET ;YES, DON'T CHANGE ITS CLASS
HRRZ T3,@[EP. JOBCLS(T2)] ;GET CURRENT CLASS VALUE
SOS @[EP. CLSCNT(T3)] ;ONE LESS IN THIS CLASS
AOS @[EP. CLSCNT(T1)] ;ONE MORE IN THIS CLASS
HRRM T1,@[EP. JOBCLS(T2)] ;SET NEW CLASS
SKIPN CLASSF ;DOING CLASS SCHEDULING?
RET ;NO .DONE THEN
MOVEM T3,NCLASS ;SAVE OLD CLASS IN NEW CLASS PLACE
CALL ADJCLS ;ADJUST CLASS PARAMETERS
MOVE T1,NCLASS ;GET BACK OLD CLASS
CALL ADJCLS ;AND ADJUST THIS AS WELL
MOVE T2,JOBNOM ;RECOVER JOB NUMBER
CALLRET CHGCNT ;AND ADJUST GOLST COUNTS
;ROUTINE TO SET CLASS PARAMETERS
; T1/ SHARE OF MACHINE TO GET
; T2/ CLASS #
CRTSHR: MOVEM T1,@[EP. CLSSHR(T2)] ;SET CLASSES SHARE
MOVE T1,T2 ;GET CLASS I.D.
CALLRET ADJCLS ;GO ADJUST CLASS PARAMETERS
;ROUTINE TO ADJUST CLSSHI AND CLSQ WHEN SOMETHING CHANGES
; T1/ CLASS
ADJCLS: SKIPN T2,@[EP. CLSCNT(T1)] ;ANY MEMBERS OF THIS CLASS?
MOVEI T2,1 ;NO. ASSUME ONE FOR CONVENIENCE
HRRZS T2 ;GET POPULATION COUNT ONLY
FLTR T2,T2 ;GET FLOAT OF POPULATION
MOVE T3,@[EP. CLSSHR(T1)] ;GET CLASS'S SHARE
FDVR T3,T2 ;GET EACH MEMBER'S FAIR SHARE
MOVEM T3,@[EP. CLSSHI(T1)] ;SAVE IT
RET ;DONE
;ROUTINE USED BY CACCT AND LOGIN TO SET CLASS OF JOB.
; T1/ CLASS TO SET
SETCLS::ASUBR <CLSNUM> ;SAVE INCOMING ARG
SKIPL T1,CTRLTT ;ATTACHED?
CALL CHKBCH ;SEE IF A BATCH JOB
JRST SETCL0 ;NO. PROCEED
IFQN. CLSBD,
SKIPE JOBSKD ;ALREADY PRIORITZED?
ANSKP.
MOVE T1,GBLJNO ;NO. GET JOB NUMBER
MOVX T2,DREGS ;GET DREGS PRIORITY WORD
SJPRI ;SET PRIORITY WORD
ERJMP .+1 ;IF FAILED, PROCEED ANYWAY
ENDIF.
LOAD T1,CLSBT ;GET BATCH CLASS
SOSGE T1 ;IF A BATCH CLASS, USE IT
SETCL0: MOVE T1,CLSNUM ;GET CLASS
JE CLSAC,,R ;IF NOT USING ACCOUNTS, RETURN NOW
NOSKED ;OWN MACHINE
SKIPL T1 ;VALID CLASS?
CAIL T1,MAXCLS ;""
SETZM T1 ;NO. USE ZERO THEN
MOVE T2,JOBNO ;GET JOB NUMBER
HRRZ T3,@[EP. JOBCLS(T2)] ;GET PRESENT CLASS
CAIE T3,0(T1) ;CHANGING?
CALL CHGCLS ;YES
OKSKED ;ALL DONE
RET ;""
;ROUTINE CALLED WHEN LOGIN WILL SUCCEED.
SKDLOG::TMNN CLSAC ;CLASS BY ACCOUNT?
SKIPN CLASSF ;NO. CLASS SCHEDULING OFF THEN?
RET ;YES. NOTHING TO DO
GTOKM (.GOCL0,,R) ;IF FAILURE, USE DEFAULT
RET ;AND DONE
;QUEUE PARAMETER TABLES
RADIX 10
;QUANTA FOR EACH QUEUE (IN HIGH PRECISION UNITS)
;HEURISTIC: A JOB SHOULD GET AT LEAST A FULL LOWEST QUEUE QUANTUM
;BEFORE FALLING TO LOW QUEUE AND THEREBY YEILDING TO ALL THE COMPUTE
;BOUND JOBS. HENCE, THE SUM OF QUANTA FOR QUEUES 0 TO MAXQ-1
;SHOULD BE .GE. THE QUANTUM FOR MAXQ
;DEFINE PROTO TABLE FOR BIAS CONTROL
QUANTB: 300*NTMS ;0 - SPECIAL HIGH PRIO QUEUE *
200*NTMS ;1 - QUICK INTERACTIVE QUEUE
400*NTMS ;2 - REGULAR INTERACTIVE
1500*NTMS ;3 - LOW PRIO INTERACTIVE OR HIGH PRIO COMPUTE
; TRANSITIONAL QUEUE
3000*NTMS ;4 - MIDDLE QUEUE (HIGH PRIO COMPUTE QUEUE)
5000*NTMS ;5 - COMPUTE QUEUE
10000*NTMS ;6 - "DREGS" QUEUE *
NQUEUE==:.-QUANTB ;NUMBER OF QUEUES
RS QUANTT,NQUEUE ;ACTIVE QUANTA TABLE
;DEFINE PROTO TABLE FOR CLASS SCHEDULER
QUANTC: 300*NTMS
INTQ0==.-QUANTC ;HIGHEST INTERACTIVE QUEUE
100*NTMS
400*NTMS
INTQ1==.-QUANTC ;LOWEST INTERACTIVE QUEUE
1000*NTMS
2000*NTMS
3000*NTMS
10000*NTMS
IFN .-QUANTC-NQUEUE,<PRINTX ?QUANTA TABLE LENGTHS DIFFER>
HIGHQ==0 ;SPECIAL HI PRI QUEUE
;INTQ0==1 ;QUICK INTERACTIVE QUEUE
;INTQ1==INTQ0+2 ;REGULAR INTERACTIVE QUEUE
LOWQ==:NQUEUE-1 ;SPECIAL LOW-PRIORITY QUEUE
MAXQ==:LOWQ-1 ;NORMAL LOW QUEUE
BQUANT: 100*NTMS ;QUANTUM GIVEN FOR PSI 'BUMP'
DEFINE GETFLQ(N)<
EXP N'.0
>
FLOWQ: GETFLQ(\LOWQ)
MFRKWD==:JP%SYS ;PRIORITY WORD FOR JOB 0
RADIX 8
RS QSUM,NQUEUE ;ACCUMULATED RUNTIMES OF QUEUES
RS LQWBAS,<LOWQ-INTQ0> ;# OF WORDS IN TABLE
;NON-CLASS BIASES
NSKBAS: 1B4 ;BASE FOR NOSKED FORK
CSKBAS: 1B5 ;BASE FOR CRSKED FORK
TBASE: XX==NQUEUE-1
REPEAT NQUEUE,<
<XX+1>B8-1
XX==XX-1>
;ROUTINE TO INIT QUANTT TABLE
;FIRST, TO INIT TO BIAS CONTROL SETTINGS
QBIAS: SKIPA T1,[QUANTB,,QUANTT]
;NOW FOR CLASS SCHEDULER
QCLASS: MOVE T1,[QUANTC,,QUANTT]
BLT T1,QUANTT+NQUEUE-1 ;DO TABLE
RET ;AND DONE
;HEURISTIC FOR ADJUSTING QUEUE LEVEL AFTER I/O WAIT
;THIS ROUTINE IS THE PRINCIPLE CONTROL OVER THE EXTENT TO WHICH
;'INTERACTIVE' OR 'COMPUTE-BOUND' JOBS ARE FAVORED. IT GIVES
;PRIORITY 'CREDIT' TO A FORK AS A RESULT OF WAITING. THE MORE
;CREDIT GIVEN FOR A CERTAIN LENGTH WAIT (OR THE SHORTER THE WAIT
;REQUIRED TO BECOME HIGH-Q), THE MORE THE SYSTEM WILL FAVOR
;INTERACTIVE FORKS, AND THE GREATER THE CHANCE THAT FREQUENT OR
;WELL-TIMED INTERACTIONS WILL GIVE A PROCESS AN EXCESSIVELY LARGE
;SHARE OF COMPUTE TIME. IT HAS BEEN DEMONSTRATED HOWEVER, THAT
;A COMPLETELY 'FAIR' ALGORITHM HERE, I.E. ONE WHICH PREVENTS AN
;INTERACTIVE FORK FROM GETTING ANY GREATER SHARE OF THE MACHINE
;THAN A COMPUTE-BOUND FORK, IS HIGHLY UNSATISFACTORY TO INTERACTIVE
;USERS UNDER MEDIUM AND HEAVY LOADS (AND ALL USERS ARE INTERACTIVE
;SOMETIMES), AND RESULTS IN EXPONENTIALLY INCREASING LEVELS OF
;FRUSTRATION, CURSING AND BEATING OF TERMINALS, ETC. THEREFORE
;THIS ROUTINE IS GENUINELY A HEURISTIC, MODIFIED AS A RESULT OF
;PRESSURES BROUGHT TO BEAR ON SYSTEM PROGRAMMERS.
;THE FOLLOWING DESCRIBES THE CURRENT PRACTICE:
; 1. TTY INPUT WAITS OF .GE. 1 SEC GIVE HIGH-Q. GREATLY REDUCES
; USER FRUSTRATION LEVEL.
; 2. WAITS BY FORKS ON QUEUE 0 RESULT IN NO CHANGE TO Q VALUE
; 3. FORKS ON QUEUES 1 TO MAXQ-1 WILL BE HIGH-Q IF WAITING TIME IS
; LONGER THAN LAST RUNTIME AS IMPLIED BY Q LEVEL.
; 4. FORKS ON MAXQ WILL BE HIGH-Q IF WAITING TIME IS LONGER THAN
; THE MAXQ QUANTUM, AND WILL BE MOVED UP TO MAXQ-1 IF WAITING
; TIME IS LONGER THAN SOME 'MINIMAL' TIME (500 MS)
;'WAITING TIME' ABOVE MEANS ACTUAL ELAPSED WAITING TIME
;DIVIDED BY THE 1-MINUTE LOAD AVERAGE. THIS KEEPS 'WELL-TIMED'
;INTERACTIONS FROM USING MORE THAN ABOUT 1/LDAV OF THE CPU.
;COMPUTE NEW Q VALUE
NEWST: MOVE T1,TODCLK ;CALCULATE ACTUAL WAITING TIME
OPSTR <SUB T1,>,FKPTX,(FX)
OPSTRM <ADDM T1,>,FKTIM,(FX) ;DON'T COUNT WAIT TIME
CAIGE T1,^D100 ;ABOVE MIN WAIT TIME?
JRST [ LOAD T1,FKQN ;NO, NO CHANGE
JRST NEWSTX]
SETZRO <BSNST,BSOVRD> ;YES, NOTE
CAIGE T1,^D2000 ;ABOVE THRESHOLD?
IFSKP.
CALL NEWWSS ;RESET WS SIZE
ENDIF.
IMULI 1,NTMS ;CONVERT TO HIGH PRECISION UNITS
TXNE F,SK%TTP ;CONSIDER INTERACTIONS?
CAMGE 1,[^D1000*NTMS] ;YES, ABOVE MIN WAIT TIME?
JRST NEWST2 ;NO FOLLOW REGULAR ALGORITHM
LOAD 2,FKSTR,(FX) ;GET SCHEDULER TEST
CAIE T2,TCOTST ;TTY OUTPUT?
CAIN T2,TTOBET
TXNN F,SK%TOP ;YES, SKIP IF WANT TTY OUTPUT PRIORITY
CAIN T2,TCITST ;TTY INPUT?
JRST [ LOAD T2,FKSTD,(FX) ;YES. GET LINE NUMBER
CALL CKPHYT ;IS IT A PSEUDO TTY?
JRST NEWST2 ;FOR PTY, FOLLOW NORMAL ALGORITHM
JRST NEWST1] ;NO, BE MORE GENEROUS
NEWST2: TXNE F,SK%WCF ;CONSIDER LOAD AVG?
JRST NEWST5 ;NO
MOVE 2,IRJAV ;AV NUMBER RUNNABLE FORKS
CAILE T2,^D10 ;BUT LIMIT IT TO 10 MAX
MOVEI T2,^D10
SUBI T2,2 ;IGNORE LOAD AVERAGE IF .LT. IGNORED VALUE
SKIPLE T2
IDIV T1,T2 ;WAIT CREDIT INV PROP'L TO LOAD AV - IGNORED
NEWST5: MOVE T2,T1
LOAD T1,FKQN ;CURRENT QUEUE
CAIN T1,LOWQ ;DREGS QUEUE?
JRST NEWSTX ;YES, NO CHANGE
CAIL T1,INTQ1 ;ELIGIBLE FOR BIG BONUS IF LOW INT OR WORSE
CAMGE T2,QUANTT+1(T1) ;WAITED LONGER THAN Q+1 QUANTUM?
SKIPA ;NOT ELIGIBLE OR NOT LONG ENOUGH
JRST NEWST1 ;YES. MAJOR BONUS
LOAD T3,FKQTM ;CREDIT REMAINING QUANTUM
ADD T3,T2
CAMG T3,QUANTT(T1) ;GREATER THAN INITIAL QUANTUM?
JRST NEWST7 ;NO, JUST UPDATE
CAIG T1,INTQ1 ;ONE OF THE HIGHEST?
JRST NEWST3 ;YES, DON'T MOVE UP BUT GIVE FULL QUANT AGAIN
NEWST6: SUB T3,QUANTT(T1) ;SUBTRACT QUANT FOR THIS QUEUE
SOJG T1,[CAMLE T3,QUANTT(T1) ;BUMP UP ONE QUEUE, FULL QUANT HERE?
TAMQB2: JRST NEWST6 ;YES, KEEP GOING HIGHER
JRST .+1] ;EXIT QUEUE NUMBER IN T1
CAIGE T1,INTQ1 ;BUT LIMIT TO LOW INT Q
MOVEI T1,INTQ1
JRST NEWST3 ;SET NEW QUEUE
;ESTABLISH VALUES FOR NEW QUEUE
NEWST7: CAIE T1,MAXQ ;STILL ON MAXQ?
JRST NEWST8 ;NO, STORE NEW QUANT = (OLD QUANT + PWC)
AOS MXQNBO ;***COUNT THIS TEMP
MOVEI T3,1 ;USE 1 UNLESS
TXNN F,SK%WCF ;PROPORTIONAL TO LDAV?
MOVE T3,IRJAV ;YES, GET LDAV
CAILE T3,^D10 ;OR 10 MAX (NOTE: 10*500 = MAXQ QUANTUM)
MOVEI T3,^D10
IMULI T3,NTMS*^D500 ;GET LDAV * 500 MS IN HP UNITS
CAML T2,T3 ;WAITED THAT LONG?
IFNSK.
AOS MXQGBO ;***
SUBI T1,1 ;BUMP ONE QUEUE
JRST NEWST3 ;AND GIVE FULL QUANTUM
ENDIF.
JRST NEWSTX ;NOT ABOVE THRESHOLD FORGET IT
NEWST1: CALL NEWWSS ;SET NEW WS SIZE
CALL INIQ ;GET INITIAL INT QUEUE
NEWST3: SKIPA T2,QUANTT(1)
NEWST8: MOVE T2,T3
STOR T2,FKQTM ;SET NEW QUEUE VALUE
STOR T1,FKQN ;SET NEW QUEUE NUMBER
MOVE T2,TODCLK
STOR T2,FKTIM,(FX)
NEWSTX: LOAD T3,FKMNQ ;GET MIN QUEUE
CAML T1,T3 ;WITHIN RANGE?
RET ;YES, DONE
MOVE T1,T3 ;NO, USE MIN
JRST NEWST3 ;AND SET VALUES
;ADJUST WS SIZE AFTER BLOCK
NEWWSS: SAVEAC <T1>
LOAD T1,FKCSIZ ;SET NR TO MAX(6, WSP)
CAMGE T1,MINWSS ;ABOVE MIN WS SIZE?
MOVE T1,MINWSS ;NO, SET TO IT
LOAD T2,FKWSS ;GET CURRENT SIZE
CAMLE T2,T1
CALL ADJWSS ;CHANGE FKNR FOR FORK
RET
;SELECT INITIAL QUEUE FOR FORK
INIQ: MOVEI T1,INTQ0+1
TXNN F,SK%RQ1
SKIPE CLASSF ;ALWAYS USE FIRST INTQ IF CLASS SCHED
MOVEI T1,INTQ0 ;USE HIGHEST INT QUEUE
RET
;BUMP PRIORITY OF FORK SO PSI WILL BE HANDLED PROMPTLY. GIVE
;GIVE PRIORITY TO SEE IF PSI IS OF INTEREST.
; FX/ FORK INDEX
; CALL PSBUMP
; RETURN +1 ALWAYS
PSBUMP: CALL CHKBMP ;SEE IF NEED BUMP PRIORITY
RET ;NO. SO RETURN NOW
JN FKBLK,,R ;IF NOW BLOCKED, DONE
CALL GLREM ;REMOVE FROM GOLST
CALLRET GOCONC ;AND REQUEUE WITH NEW PRIORITY
;ROUTINES USED BY SJPRI AND SPRIW TO CAUSE PSI FOR FKMNQ UPDATE
;INTERRUPT SPECIFIC PROCESS
; T2/ SYSTEM FORK HANDLE
SETPRF::MOVX T1,PSIPRI
CALLRET PSIGR ;AND COMPLETE TASK
SUBTTL HLTJB - Halt job
;Here in top fork of job that is on its way out
HLTJB:: HRRE 6,CTRLTT
JUMPL 6,HLTJB1 ;IF JOB DETACHED
CALL LCKDVL ;LOCK DEVICE LOCK, GO NOINT
MOVE 2,6
CALL TTYDAS ;DEASSIGN CTRLTT
JRST HLTJB3 ;GO CHECK FOR ERROR OR DISMISS
UNLOKK DEVLKK ;UNLOCK THE DEVICE LOCK
OKINT ;DEVLCK WENT NOINT
HLTJB1: MOVE 5,JOBNO
SETOM CTRLTT ;CLEAR CONTROL TTY WORDS
HRROS JOBPT(5)
CALL UNMIDX ;UNMAP THE DIRECTORY AND INDEX FILE
CALL CLNZSC ;CLEAR ALL NON-ZERO SECTIONS
JFCL ;UNABLE TO CLEAR ALL - CONTINUE ANYWAY
SETZM JOBM0+JSBPG ;CLEAR FAKE JSB MAPPING
MOVE FX,FORKX ;THIS FORK.
LOAD 1,FKJSB ;GET JSB
CALL WTSPT ;WAIT FOR IT TO BE UNSHARED
SETZ 1,
LOAD T2,FKJSB ;GET SPT INDEX OF JSB
HRLS T2 ; INTO LEFT HALF
HRRI 2,JOBMAP-JSBPGA ;(SPT INDEX FOR JSB,,OFFSET FOR JOB MAP)
MOVEI 4,JSLST-JSBPG
CALL MSETP1 ;CLEAR JOB MAP
LOAD 2,FKPSB ;GET SPT INDEX OF PSB
HRLS T2 ; INTO LEFT HALF
HRRI 2,PPLOW ;(SPT INDEX FOR PSB,,OFFSET FOR PROCESS MAP)
SETZ 1,
MOVEI 4,PPHI+1-PPLOW
CALL MSETP1 ;CLEAR ALL PAGES OF PROCESS MAP
IFDEF EHLJSB,<
;Clear page-table for extended JSB
LOAD T1,FKJPT ;Get SPT index
CALL WTSPT ;Wait for it to be unshared
SETZ 1, ;Indicate we want the map cleared
LOAD T2,FKJPT ;Get SPT index
HRLZS T2 ;Move to left half for PTN.PN
MOVEI 4,PGSIZ ;Do the whole map
CALL MSETP1 ;Clear it
>
LOAD 1,FKJSB ;SPT INDEX OF JSB
CALL WTSPT ;WAIT FOR IT TO BE UNSHARED
CALL WTFPGS ;WAIT FOR PSB AND UPT TO BE IN NO MAPS
ENTSKD ;ENTER SCHED
MOVE T2,JOBNO ;RELEASE JOB NUMBER
SETZM JOBDIR(T2) ;CLEAR DIRECTORY NUMBER
SETOM JOBRT(T2) ;INDICATE JOB NUMBER NOT IN USE
HRRZ T1,@[EP. JOBCLS(T2)] ;SAVE CLASS OF JOB
ADDI T2,JOBPT
EXCH T2,FREJOB ;PUT SLOT ON FREE LIST
MOVEM T2,@FREJOB
SOS @[EP. CLSCNT(T1)] ;ONE LESS JOB IN THIS CLASS
MOVE T2,JOBNO ;GET THE JOB NUMBER
CAME T2,MJBUSE ;WAS THIS THE HIGHEST JOB IN USE?
IFSKP.
DO.
SOS T2,MJBUSE ;YES. NO LONGER IN USE
SKIPGE JOBRT(T2) ;PREVIOUS JOB IN USE?
LOOP. ;NO. DISCOUNT IT TOO
OD.
ENDIF.
SKIPE CLASSF ;DOING CLASS SCHEDULING?
CALL ADJCLS ;NOW UPDATE CLASS VALUES
JRST HLTFK2 ;FLUSH THIS LAST FORK
;LOCAL MSETPT - BUGCHK ON FAILURE
MSETP1: CALL MSETPT ;CLEAR ALL PAGES OF JOB MAP
BUG.(CHK,MAPCLF,SCHED,SOFT,<FAILED TO CLEAR MAPS WHEN KILLING JOB>,,<
Cause: A call to MSETPT to clear the job map or process map for
the top fork of a job being killed has failed.
Action: Continue.
>)
RET
;HLTJB CONTINUED..
;DEASSIGN OF JOB CONTROLLING FAILED
HLTJB3: TXZN T1,1B0 ;FAILED. NEED TO WAIT?
BUG.(HLT,TTDAS1,SCHED,HARD,<HLTJB: UNABLE TO DEASSIGN CONTROLLING TERMINAL>,,<
Cause: The monitor is killing the last (top) fork in a job and is trying to
deassign the job's controlling terminal. The attempt has failed for an
unexpected reason (one that will not be corrected if the fork waits a
while). This indicates inconsistency in the monitor's data base.
>)
UNLOKK DEVLKK ;YES. UNLOCK THE DEVICE LOCK
OKINT ;LCKDVL WENT NOINT
HRL T1,CTRLTT ;T1/(LINE NUMBER,,ADDRESS OF ROUTINE)
MDISMS ;WAIT UNTIL DEALLOCATION IS POSSIBLE
JRST HLTJB ; AND TRY AGAIN
;FINISH DELETE OF FORK
HLTFK1::ENTSKD ;ENTER SCHEDULER
HLTFK2: CALL REMBSJ ;REMOVE FORK FROM BAL SET
CALL REMWSN ;REMOVE WS WO POSTPURGING
CALL GLREM ;REMOVE FORK FROM GOLST
CALL SETPSK ;Set to scheduler context
LOAD 1,FKJSB ;JSB
CALL GETSHR ;GET SHARE COUNT
MOVE 2,1 ;SAVE IT
LOAD 1,FKJSB ;GET BACK JSB
CAIN 2,1 ;LAST USE OF JSB?
IFSKP.
CALL DWNSHR ;NO. REDUCE SHARE COUNT
ELSE.
CALL DESPT ;YES, DELETE IT (LOGOUT CASE)
ENDIF.
IFDEF EHLJSB,<
;Decrement share count/delete page table for extended JSB
LOAD T1,FKJPT ;Get SPTX for extended JSB PT
CALL GETSHR ;Get share count
MOVE T2,T1 ;Save it
LOAD T1,FKJPT ;Get JSB PT SPTX again
CAIN T2,T1 ;Last use of page table?
IFSKP.
CALL DWNSHR ;No, merely reduce share count
ELSE.
CALL DESPT ;Yes, delete page table
ENDIF.
>
LOAD 1,FKUPT ;UPT
CALL DESPT ;DELETE IT
LOAD T1,FKPS2 ;GET STACK I.D.
CALL DESPT ;RELEASE IT AS WELL
LOAD 1,FKPSB
CALL DESPT ;DEASSIGN PSB
SETOM FORKX
MOVEI T1,FKPT(FX)
EXCH T1,FREFK ;PUT FORK NUMBER ON FREE LIST
TLO T1,400000
MOVEM T1,@FREFK
CALL FKGC ;CLEAN UP ALL PAGES OF FORK
SETZM FKPGS(FX) ;ZERO FKPGS AS A FLAG OF NON ASSIGNED FORK
LOAD 1,FKCSIZ ;MAKE SURE FORK CLEANED UP
CAIE 1,0
BUG.(CHK,FRKNDL,SCHED,HARD,<FORK NOT PROPERLY DELETED>,,<
Cause: This BUG is not documented yet.
Action:
>)
CALL RDSIVL ;GET TIME SINCE ENTSKD
IDIVI T1,NTMS ;CONVERT TO MS
ADDM T1,USRTIM ;ACCUMULATE TOTAL USER TIME
JRST SCHED0 ;NOW THERE IS NOTHING LEFT OF JOB...
;WAIT FOR PSB AND UPT TO HAVE SHARE COUNT OF 1
WTFPGS::LOAD 1,FKPSB ;PSB
CALL WTSPT
LOAD T1,FKPS2 ;GET STACK PAGE
CALL WTSPT ;WAIT FOR THIS AS WELL
LOAD 1,FKUPT ;UPT
;CALLRET WTSPT
;WAIT FOR SPECIFIED SPT TO HAVE SHARE COUNT OF 1
; T1/ SPT INDEX
; CALL WTSPT
;RETURN +1: ALWAYS, COUNT NOW 1
WTSPT:: SAVEAC <T4>
WTSPT2: MOVE 2,1 ;SAVE 1 SINCE WTSPTT CLOBBERS IT
CALL WTSPTT ;(T1,FX)
IFNSK.
MOVSI 1,0(2)
HRRI 1,WTSPTT
MDISMS
HLRZ 1,1
JRST WTSPT2
ENDIF.
RET
WTSPTT::CALL GETSHR ;GET SHARE COUNT
CAIE 1,1
RET
RETSKP
SUBTTL Fork initialization
;Here when NEWFK% was set in FKINT. Initialize the fork. If this is the top
;fork in a newly-created job, NEWJB% is set, too.
FKSET: MOVE 1,UPP ;GET USUAL MON STACK
MOVEM 1,PIAC+P ;PUT IN AC17
MOVE T1,[IOWD NPSIPG*PGSIZ,PSIPGA] ;SET UP STACK POINTER
MOVEM 1,PSIPT ;PSI STORAGE STACK
MOVEI 1,<UACB>B39-1 ;SETUP AC BASE
MOVEM 1,ACBAS
CALL FKSETK ;SETUP HWPT STUFF
MOVX T1,<NOP>
MOVEM T1,FRKNOP
MOVE 1,INTDF0 ;INTERRUPT SWITCHES
MOVEM 1,INTDFF
MOVE 1,MJRST0
MOVEM 1,MJRSTF
MOVX T1,MONENV ;INITIALIZE XPCW BLOCK USED BY PSI SERVICE
MOVEM T1,PIPC+1 ;NEW FLAGS WORD
XMOVEI 1,PSISV1
MOVEM 1,PIPC+2 ;NEW PC WORD
SETZM NSKED
SETZM CRSKED
SETZM SNPPGS ;INITIALIZE SNOOP BREAK POINTS
SETZM SNPLST ; NONE TO START WITH
SETOM PSISYS ;INIT PI SYSTEM OFF
IFN <FTKLIPA>,<
SETOM SCSPS0 ;Init SCS% PSI channels as off
SETOM SCSPS1 ;. . .
SETZM SCSTMQ ;Zero top of message queue
XMOVEI T1,SCSTMQ ;Get a pointer to the top of the queue
MOVEM T1,SCSBMQ ;Init tail as pointer to head
SETZM SCSTDQ ;Zero top of datagram queue
XMOVEI T1,SCSTDQ ;Get a pointer to the top of the queue
MOVEM T1,SCSBDQ ;Init tail as pointer to head
SETZM SCSTEQ ;Zero top of event queue
XMOVEI T1,SCSTEQ ;Get a pointer to the top of the queue
MOVEM T1,SCSBEQ ;Init tail as pointer to head
SETZM SCSTXQ ;Zero top of DMA queue
XMOVEI T1,SCSTXQ ;Get a pointer to the top of the queue
MOVEM T1,SCSBXQ ;Init tail as pointer to head
SETZM SCSTCQ ;Zero top of CB queue
XMOVEI T1,SCSTCQ ;Get a pointer to the top of the queue
MOVEM T1,SCSBCQ ;Init tail as pointer to head
>;End IFN <FTKLIPA>
MOVE 1,RSKEDN
MOVEM 1,RSKED
MOVSI 1,<MOVEM 1,0>B53
MOVEM 1,PATU40 ;SETUP INSTRUCTION PART FOR COMPAT
MOVEM 1,PATUPC ;ENTRY PROCEDURE
MOVEM 1,DMSU40 ;SET UP FOR DMS CALLS
MOVEM 1,DMSUPC
SETOM SLOWF
SETOM INTDF
SETOM TRAPC
MOVE 1,NPMAX ;INIT LOCAL NPMAX TO SYSTEM NPMAX
MOVEM 1,FNPMAX
SETOM FKTAB
MOVEI 1,FKTAB+1
HRLI 1,-1(1)
BLT 1,FKTAB+NLFKS/2-1
SETZM JTTRW ; Clear JSYS trap word
SETZRO JTFRK ; Clear trapped fork
MOVEI T1,7777 ; We haven't interrupted anyone yet
STOR T1,JTMNI ; ...
MOVEI T1,77 ; And we don't want to be interrupted
STOR T1,JTMCN
MOVE T1,[IFIW!FKJTB] ; Put under top fork's environment
MOVEM T1,JTBLK ; until CFROK can update to FKJTB+forkn
SETOM JTLCK ; Clear lock
MOVE FX,FORKX
NOINT ;FORK MUST BE NOINT DURING PAGE CREATION
CALL FKSETP ;SETUP PSB AND UPT POINTERS
MOVEI T1,NPSIPG ;MUST CREATE ALL PI PAGES
MOVEI T2,PSIPGA ;THE FIRST ONE
DO.
SETZM 0(T2) ;CREATE THIS ONE
ADDI T2,PGSIZ ;NEXT PAGE
SOJG T1,TOP. ;DO ALL OF THEM
ENDDO.
OKINT ;MAKE INTDF LOOK NORMAL AGAIN
LOAD 1,FKJBN ;GET JOB NUMBER
MOVEM 1,JOBNO
MOVE 6,PIMSK ;GET REQUEST BITS
;See if this is part of job creation. If yes, go initialize the job.
TXNE 6,NEWJB% ;NEW JOB TOO?
JRST FKSET1 ;YES
LOAD 1,FKJSB ;GET JSB
CALL UPSHR ;BUMP SHARE COUNT
IFDEF EHLJSB,<
LOAD T1,FKJPT ;Get SPT slot for PT of extended JSB
CALL UPSHR ;Bump share count on page table
>
XMOVEI 1,FKSET2
FKSET3: MOVEM 1,PIPC
MOVX T1,MONENV ;GET AC BLOCK DEFINITION FOR MONITOR MODE
MOVEM T1,PIFL ;MAKE THIS BE THE OLD FLAGS WORD FOR INTERRUPT
SETZM PIOLDS
JRST PIRQR ;DEBREAK - RUN IN NORMAL MODE
;INIT NEW JOB
;Here when NEWJB% was set in PIMSK during fork initialization.
;FKSET was called because NEWFK% was set, too.
FKSET1: HRREI T2,0(6) ;GET NUMBER OF CONTROLLING TTY, IF ANY
MOVE T1,JOBNO
STOR T2,JBTTY,(T1) ;TTY ASSIGNED TO JOB
FKSE01: PUSH P,T1 ;SAVE JOB NUMBER
MOVE T1,FORKX ;SET FORKX INTO THIS TTY'S PSI DESTINATION
SKIPL T2 ;IF THERE IS A TTY,
CALL STTOPF ; PUT IN THE FORKX
POP P,T1 ;RESTORE JOB NUMBER
HRRZ T2,@[EP. JOBCLS(1)] ;GET CLASS OF THIS JOB
MOVE T1,T2 ;GET CLASS
SKIPE CLASSF ;IF DOING CLASS SCHEDULING, ADJUST
CALL ADJCLS ;AND SET UP PARAMETERS
CALL LGTAD ;GET CURRENT TIME
MOVEM T1,SRTTIM ;REMEMBER TIME JOB STARTED (MAYBE -1)
MOVNI T1,1 ;INITIALLY SET CONTROLLING TERMINALS TO -1
MOVSI T2,-NUFKS ;DO FOR ALL FORKS
ICTTY: STOR T1,FRKTTY,(T2)
AOBJN T2,ICTTY ;LOOP FOR ALL FORK SLOTS
MOVE T1,JOBNO
HLRE T2,JOBPT(T1) ;CONTROLLING TTY, IF ANY, -1 IF NONE
MOVEM T2,CTRLTT ;IN JSB
LOAD T1,FKJSB ;GET JSB IDENT
MOVE T2,SHRPTR ;CONSTRUCT JSB MAPPING
STOR T1,SPTX,T2
MOVEM T2,JOBM0+JSBPG
SETZM @JTBLK ; No jsys traps for top fork
MOVEI T1,DCOPNM ;DEFAULT MAX DECNET LINKS
STOR T1,DCMAX ;TO THE JSB
MOVEI T1,ATJBMX ;MAXIMUM HTN'S FOR A JOB
STOR T1,JSAMX ;STORE IN JSB
XMOVEI T1,EXEC0 ;RUN AT EXEC0
JRST FKSET3
;Here when PSI processing is complete. FKSET stored this location in FPC,
;and process is continued here after the interrupt.
FKSET2: XCTU [SETZM 0] ;CLEAR USER AC'S
MOVEI CX,1
XBLTUU [BLT CX,17]
ENTSKD
SETZM PPC ;SET PC 0
MOVX 1,USRCTX ;SET USER MODE CONTEXT
MOVEM 1,PFL
MOVEI 1,HALTT
JRST DISMSE
SUBTTL Software Interrupt Service
CHNSON::EXP 1B9+1B11+1B12+1B15+1B16+1B17+1B18+1B20 ;ALWAYS ON PSI CHANS
;SCHEDULER CAUSES JOB TO BE STARTED HERE ON PI REQUEST
;SAVED PC IN PIPC, FLAGS IN PIFL
;PIMSK CONTAINS INTERRUPT REQUEST WORD
;Here from main scheduler loop if FKINT indicates interrupt is pending
;(bit FKPSI1 is on).
;PCU is set so that previous context references go to user
;FKINT has been copied to PIMSK
PIRQ: MOVEM P,PIAC+17
MOVEI P,PIAC ;SAVE USER AC'S
BLT P,PIAC+16
MOVE P,PIPDL ;SET UP LOCAL STACK
MOVE P2,TRAPFL
MOVE P3,KIMUFL
MOVE P4,TRAPPC ;SAVE IMMEDIATELY VULNERABLE CELLS
MOVE P5,KIMUPC
MOVE P6,KIMUEF
MOVE FX,PIMSK ;INTERRUPT REQUEST WORD
MOVE Q2,FORKX
;Save wait state at time of interrupt
SETZ T2,
TXNE FX,PSIWT% ;WAS FORK IN WAIT STATUS?
LOAD T2,FKSTX,(Q2) ;YES, GET OLD STATUS
MOVEM T2,PIOLDS ;SAVE OLD STATUS, OR 0 IF WAS RUNNING
SETZ T2,
TXZE FX,PSIWT% ;WAS FORK IN WAIT STATUS
LOAD T2,FKST2,(Q2) ;YES GET OLD STATUS
MOVEM T2,PIOLD2 ;SAVE OLD STATUS
;Determine reason for interrupt and go handle some cases.
TXZE FX,NEWFK% ;START NEW FORK?
JRST FKSET ;YES
TXZE FX,PSIT1%
JRST PSIT1 ;TERMINAL, PHASE 1
TXZE FX,PSIT2%
JRST PSIT2 ;TERMINAL, PHASE 2
TXZE FX,PSITL% ;TIME LIMIT EXCEEDED INTERRUPT?
JRST TLEINT ;YES, GO INTERRUPT THE FORK
TXZE FX,PSIPRI ;SET PRIORITY WORD?
JRST PRISET ;YES. GO FIX UP DATA BASE
IFN <FTKLIPA>,<
TXZE FX,PSISC% ;Does SCS% need attention???
CALL SCSPSI ;Yes,take entries off work Q,put on fork+CB Q's
>;End IFN <FTKLIPA>
PSITR1::TXNE FX,PSIIF%+SUSFK%+PSILO%+PSICO%+PSIJT%+ADRBK%+PSIDP%
JRST PSII ;CHANNEL INTERRUPT SPEC. BY FKINTB -
; PSIIF%, PSIJT%.
;Interrupt superior - ADRBK%.
;Special request - SUSFK%.
;Dispatch to action procedure -
; PSILO%, PSICO%, PSIDP%
;..
;Here to finish the interrupt.
;Restore data as before the interrupt and allow rescheduling.
;..
PIRQR: CALL UNPIR ;LEAVE PI STATE
PSIDF1: SKIPN 1,PIOLDS ;WAS RUNNING BEFORE PSI?
JRST SCHED0 ;YES
CAIE 1,TRMTS1 ;WAITING FOR ARBITRARY FORK TERM?
JRST PSIDF2 ;NO, RETURN TO WAIT STATE
SETZM PIOLDS ;CLEAR OLD STATE
XMOVEI 1,WFORKA ;GO BACK INTO JSYS TO DO TEST
MOVEM 1,PPC ; AND MAKE THIS THE PC
MOVX T1,MONENV ;SET UP AC BLOCKS FOR MONITOR MODE
MOVEM T1,PFL ; AND MAKE THIS THE NEW FLAGS
JRST SCHED0 ;GO RESCHEDULE THIS PROCESS
PSIDF2: MOVE T2,PIOLD2 ;GET THE OLD FKSTA2 WORD
STOR T2,FKST2,(FX) ;AND RESTORE IT
JRST DISMSE ;AND GO DISMISS
;LEAVE PSI CONTEXT. RETURN THROUGH SCHEDULER
;Leaves with P pointing to SKDPDL
;Caller set up PIFL and PIPC to point to where process should start running.
;PIOLDS contains 0 if process is runnable.
UNPIRN: TDZA T1,T1 ;DON'T REQUEUE IF BUMPED
UNPIR: MOVEI T1,1 ;CONDITIONAL REQUEUE IF BUMPED
AOS INSKED ;ENTER SCHEDULER
POP P,CX ;GET LOCAL RETURN
MOVE P,PI7P ;SETUP SCHED STACK
PUSH P,CX ;PUT LOCAL RETURN ON IT
PUSH P,T1 ;SAVE ENTRY FLAG ON STACK
MOVEM P2,TRAPFL
MOVEM P3,KIMUFL
MOVEM P4,TRAPPC ;RESTORE VULNERABLE CELLS
MOVEM P5,KIMUPC
MOVEM P6,KIMUEF
MOVE 1,[XWD PIAC,PAC]
BLT 1,PAC+17 ;PUT AC'S BACK
JSP FX,KISSAV ;SAVE APR-DEPENDENT STUFF
MOVE 1,PIFL
MOVEM 1,PFL
MOVE 1,PIPC
MOVEM 1,PPC
MOVE FX,FORKX
TMNN FKPS1,(FX) ;INTERRUPT IN PROGRESS?
BUG.(CHK,UNPIRX,SCHED,HARD,<UNPIR-NO PSI IN PROGRESS>,,<
Cause: This BUG is not documented yet.
Action:
>)
SETZRO FKPS1,(FX) ;YES. CLEAR IT
JE PIBMP,,[POP P,0(P) ;CLEAN UP THE STACK
RET] ;AND DONE
SETZRO PIBMP ;CLEAR BUMPING
POP P,CX ;GET BACK ENTFLG
SKIPE CX ;REQUEUEING WANTED?
SKIPE PIOLDS ;YES. CONTINUE AS RUNNABLE?
RET ;NO. DONE THEN
SAVET ;YES. SAVE ALL REGS
CALL GLREM ;REMOVE FROM GOLST
CALLRET GOCONC ;AND DONE
PIPDL: IOWD NPIPDL,PIPDB ;INTERRUPT ROUTINES LOCAL PDL
;REQUEST PSEUDO INTERRUPT
;IIC TO SELF - FOR MONITOR INTERNAL USE. FASTER THAN IIC AND DOES
;NOT REQUIRE PROCESS TO BE ABLE TO SET FKLOCK.
; 1/ CHANNEL MASK
; CALL IICSLF
; RETURN +1 ALWAYS
;PSIRQ0 - SAME AS IICSLF EXCEPT TAKES CHANNEL NUMBER IN 1 RATHER THAN MASK
PSIRQ0::MOVE 1,BITS(1) ;GET MASK FOR CHANNEL
IICSLF::TDNN 1,PSICHM ;SEE IF INTERRUPT WILL BE TAKEN
TDNE 1,CHNSON
JRST IICSL1 ;YES
TDNN 1,SUPCHN
RET ;NO, DON'T SEND IT
IICSL1: NOINT
MOVE 2,FORKX
CALL PSIRQB ;REQUEST THE INTERRUPT
OKINT
CHKINT ;GET IT PROCESSED IF POSSIBLE
RET
;GENERAL PSI REQUEST HANDLER
; 1/ CHANNEL MASK FOR PSIRQB, CHANNEL NUMBER FOR PSIRQ
; 2/ FORK INDEX
; CALL ...
; RETURN +1 ALWAYS
;VARIENTS:
; PSITQ - CHANNEL BITS ALREADY SET, JUST REQUEST CHECK
; PSIGR - T1/ MASK FOR OTHER REQUESTS
PSIRQ:: MOVE 1,BITS(1)
PSIRQB::HRRZS 2
EA.ENT
OPSTRM <IORM 1,>,FKIBX,(2);SET BIT IN INTERRUPT WAITING BUFFER
PSITQ: MOVX T1,PSIIF% ;REGULAR INTERRUPT FLAGS
PSIGR:: TXO T1,FKPSI0
OPSTRM <IORM 1,>,FKINX,(2)
CAMN 2,FORKX ;FOR THIS FORK?
RET ;YES
PSIR4:: CONSO PI,177B27 ;AT PI LEVEL ?
NOSKD1 ;NO. KEEP SCHEDULER OUT.
PUSH P,FX
MOVEI FX,0(2)
JN FKPS1,(FX),PSIR61 ;IF NOT INTERRUPT, DON'T DO THIS
IFQN. FKBLK,
SETONE FKIWT,(FX) ;SET WAKE FLAG
CALL UNBLK1 ;WAKE UP THE FORK
ENDIF.
PUSH P,3
CALL PSBUMP ;NO, GIVE FORK 'BUMP' TO GET PSI HANDLED
POP P,3
PSIR61: MOVEI 2,0(FX)
POP P,FX
CONSO PI,177B27 ;AT PI LEVEL ?
OKSKD1 ;NO. ALLOW SCHEDULER TO RUN
RET
;TERMINAL INTERRUPT
;PHASE ONE - CALLED FROM TERM SERVICE ROUTINES
; 2/ LINE NO., 3/ INTERRUPT CODE
;SEND TO TOP FORK TO FIND PROPER DESTINATION
TTPSRQ::PUSH P,T3 ;SAVE INTERRUPT CODE
CALL GTCJOB ;GET CONTROLLING JOB
TTPSRX: JRST [ POP P,T3 ;NONE (SHOULDN'T HAPPEN)
RET]
CAIN T3,-1 ;IS THERE A CONTROLLING JOB?
JRST TTPSRX ;NO. SHOULDN'T HAPPEN
HLRZ T4,JOBPT(T3) ;GET THE JOB'S CONTROLLING LINE
CAIE T4,0(T2) ;IS IT THIS LINE?
JRST TTPSR2 ;NO, LOOK ELSEWHERE IN THAT JOB
HRRZ 2,JOBPT(3) ;GET INDEX OF TOP FORK
TTPSR1: POP P,T3 ;RESTORE INTERRUPT CODE
STOR T3,TRMCD,(T2) ;INTERRUPT CODE
MOVX T1,PSIT1% ;PHASE ONE REQUEST
CALLRET PSIGR
TTPSR2: CALL GTTOPF ;GET TOP FORK OF TTY'S CTTY GROUP
JRST TTPSRX ;THAT TTY ISN'T ACTIVE
MOVEI T2,(T3) ;COPY THE FORKX
CAIL T2,NFKS ;IS IT VALID? (ELSE -1 FOR NONE)
JRST TTPSRX ;NO
JRST TTPSR1 ;YES, GO INTERRUPT THIS FORK
;ROUTINES TO HANDLE INTERRUPT CONDITIONS AS SPECIFIED BY BITS
;IN LEFT HALF OF FKINT
;TERMINAL INTERRUPT, PHASE ONE
;THIS CODE RUN IN TOP FORK ONLY
;Here when PSIT1% is set in FKINT
PSIT1: LOAD Q2,TRMCOD,FX ;GET TERM INTERRUPT CODE
MOVE Q2,BITS(Q2)
HRRZ 1,FORKN ;START WITH TOP FORK
LOAD T4,FRKTTY,(T1) ;GET CONTROLLING TERMINAL
SETO Q1,
TDNE Q2,FKPSIE(1) ;TERM CODE ON IN FORK?
MOVEI Q1,0(1) ;YES, REMEMBER FORK
CALL PSIT1A ;LOOK AT ALL INFERIORS
JUMPL Q1,PSIT11 ;NOT FOUND, SO TURN OFF CODE
HRRZ 2,SYSFK(Q1) ;GET SYSTEM INDEX OF FORK TO GET INTERPT
CAMN 2,FORKX ;THIS FORK?
JRST PSIT2 ;YES, GO DIRECTLY TO PHASE TWO
NOSKED
LOAD T1,TRMCOD,FX ;NO. GET TERM INTERRUPT CODE
STOR T1,TRMCD,(T2) ; AND SET UP INT FOR PROPER FORK
MOVX 1,PSIT2% ;PHASE TWO REQUEST FLAG
CALL PSIGR
OKSKED
JRST PSITR1
PSIT11: CAIN T4,-1 ;SOURCE OF PSI = JOB CTTY?
JRST PSIT12 ;YES
TRZN T4,1B18 ;MAYBE, CONVERT TO LINE #
JRST PSITR1 ;DESIGNATOR, NOT TTY. RETURN.
CAMN T4,CTRLTT ;CTTY OF JOB?
JRST PSIT12 ;YES
CAIGE T4,NLINES ;VALID TTY NUMBER?
CAIGE T4,0
JRST PSITR1
JRST PSIT13 ;YES
PSIT12: ANDCAM Q2,TTSPSI ;NOT FOUND, SO TURN OFF CODE
SKIPGE T2,CTRLTT
JRST PSITR1
PSIT13: MOVE T1,Q2 ;T1/ INTERRUPT BIT
CALL CLRINT ;CLEAR THE INTERRUPT IN TERMINAL'S DATA
JRST PSITR1
;SEARCH FORK STRUCTURE FOR FORK TO INTERRUPT
; T4/ DESIGNATOR OF SOURCE OF THIS PSI
PSIT1A::ADD 1,INFERP ;LOOK AT INFERIOR LIST
PSIT1B: LDB 1,1 ;GET NEXT IN LIST
JUMPE 1,R ;RETURN AT END OF LIST
LOAD T2,FRKTTY,(T1) ;GET CONTROLLING TERMINAL
CAIE T2,0(T4) ;IS IT THE ONE THAT MADE THIS PSI?
JRST PSIT1E ;NO, SO DON'T CONSIDER FORK.
HRRZ 2,SYSFK(1) ;CHECK STATE OF FORK
PUSH P,FX ;SAVE FX
MOVEI FX,0(T2) ;SEE IF THIS FORK IS FROZEN OR HALTED
CALL CHKWT ; ..
JRST [ POP P,FX ;IT'S NOT.
JRST PSIT1D]
POP P,FX ;YES, SEE WHICH
LOAD T3,FKSTR,(T2) ;GET ITS STATE
CAIN T3,FRZWT ;FROZEN?
JRST PSIT1G ;YUP
CAIE T3,HALTT ;NO, HALTED OR FORCED TERM?
CAIN T3,FORCTM ; ..
JRST PSIT1C ;YES.
PSIT1D: TDNE Q2,FKPSIE(1) ;FORK HAS CODE ENABLED?
MOVEI Q1,0(1) ;YES, REMEMBER IT
PSIT1E: HRLM T1,0(P) ;REMEMBER CURRENT FORK
CALL PSIT1A ;CHECK ITS INFERIORS
HLRZ T1,0(P) ;RECOVER CURRENT FORK
XMOVEI T2,20 ;RESTORE RETURN ADDRESS
HLLM T2,0(P)
PSIT1C: ADD T1,PARALP ;LOOK AT ITS PARALLELS
JRST PSIT1B ;DO PARALLELS
PSIT1G: JE FKFRJ,(T2),PSIT1C ;ORDINARY FREEZE IF NOT FROZEN BY JSYS TRAP
JN FKEFR,(T2),PSIT1C ;IF OTHER TRAPS, TOO, DON'T CONSIDER THIS FORK
JRST PSIT1D ;JUST JSYS TRAP. IT MAY STILL
; TAKE THE PSI, SO CONSIDER THIS FK.
;FORK STRUCTURE POINTERS
SUPERP::POINT 12,FKPTRS,11 ;SUPERIOR
PARALP::POINT 12,FKPTRS,23 ;PARALLEL
INFERP::POINT 12,FKPTRS,35
;TERMINAL INTERRUPT, PHASE TWO
;Here when PSIT2% is set in FKINT or directly from PSIT1.
PSIT2: LOAD T1,TRMCOD,FX ;GET TERM INTERRUPT CODE
CALL GETCHA
LDB 2,2
MOVE 1,BITS(2) ;AND SET BIT IN INT. WAITING WORD
AND 1,PSICHM ;BUT ONLY FOR ENABLED CHANNELS
IORM 1,PSIBW
JRST PSII ;THEN GO PROCESS IT
;TIME LIMIT EXCEEDED INTERRUPT
;ROUTINE TO ISSUE TIME LIMIT EXCEEDED INTERRUPT
; RUN BY TOP FORK OF JOB ONLY
;Here when PSITL% is set in FKINT
TLEINT: MOVE T1,JOBNO ; Get the job
LOAD T2,JOBRTP,(T1) ; And then ptr to runtime limit blk
JUMPE T2,PSITR1 ; If none, then don't do this
PUSH P,T2 ; Save so we can release blk
LOAD T1,TIMCHN,(T2) ; Channel for poke
LOAD T2,TIMFRK,(T2) ; And fork to poke
CALL PSIRQ
POP P,T4 ; Blk to be released
CALL CLKKIL ; Release storage for clock
MOVE T1,JOBNO
SETZRO JOBRTP,(T1) ; And finally clear the ptr
JRST PSITR1 ;CONTINUE ON
;PRIORITY WORD WAS SET. COMPUTE NEW FKMNQ
;Here when PSIPRI is set in FKINT
PRISET: PUSH P,FX ;SAVE INT BITS
MOVE FX,FORKX ;GET FORK HANDLE
SKIPN T1,JOBBIT ;GET LOCAL PRIORITY WORD
MOVE T1,JOBSKD ;GET JOB PRIORITY WORD
LDB T1,[POINT 6,T1,29] ;GET HIGH Q NUMBER FROM PRIORITY WORD
STOR T1,FKMNQ ;NEW MIN Q FOR PROCESS
POP P,FX
JRST PSITR1 ;PROCEED
;SUSPEND FORK REQUEST
;Here when SUSFK% is set in FKINT
PIRSFK: MOVE 1,FX ;GET PIMSK
MOVE FX,FORKX
TXZ 1,FKPSI0+SUSFK% ;CLEAR THIS REQUEST
OPSTRM <IORM 1,>,FKINX,(FX) ;KEEP OTHER REQUESTS
DMOVE 1,PIFL
CALL PITEST ;NOW INTERRUPTABLE?
JRST PIRSF1 ;NO
MOVEI 3,SUSWT ;SUSPENDED FORK TEST
PIRSK1: MOVE 2,FORKX
SETZRO FKSUS,(T2)
CALL UNPIRN ;LEAVE INTERRUPT STATE
SETONE FKPS1,(FX) ;SET INTERRUPT STARTING BIT
MOVEI 1,0(3) ;SUSWT OR FRZWT
HRL 1,PIOLDS ;WITH OLD STATUS
PUSH P,T1
MOVEI T1,SUSFKT
CALL WAKSUP ;WAKEUP SUPERIOR IF WAITING FOR SUSP
POP P,T1
JRST DISMSE ;DISMISS
PIRSF1: MOVE FX,FORKX
NOSKED ;
LOAD T1,FKSTR,(FX) ;
CAIN T1,JTQWT ; IN JSYS TRAP QUEUE WAIT?
JRST PIRSF2 ; YES, ALLOW SUSPENSION
OKSKED ;
SETONE FKSUS,(FX) ;TURN REQUEST BIT BACK ON
JRST PSIDFR ;AND SET DEFERRED INTERRUPTS
PIRSF2: MOVEI T1,FKJTQ(FX) ; FORK IN JSYS TRAP QUEUE WAIT
CALL JTDEQ ; REMOVE IT FROM QUEUE
MOVX T1,MONENV ;SET AC BLOCKS
MOVEM T1,PIFL ;SAVE AS FLAGS WORD
XMOVEI T1,JTRLCK ; SET RESUME ADDR. TO LOCK ROUTINE
SETZM PIOLDS ;
MOVEM T1,PIPC ;
OKSKED ;
MOVEI T3,SUSWT ;
JRST PIRSK1 ;
SUSWT:: JRST 0(4) ;SCHEDULER TEST FOR SUSPENDED FORK
;CARRIER OFF ACTION REQUEST
;Here when PSICO% is set in FKINT
PIRCOF: DMOVE T1,PIFL
CALL TFTEST ;INTERRUPT OK NOW?
JRST [ MOVE FX,FORKX ;NO, SETUP DEFER
SETONE FKICO,(FX) ;KEEP REQUEST IN FKINT
JRST PSIDFR] ;GO SET DEFER
MOVX T1,PSIWT% ;SEE IF PROCESS WAS WAITING
TDNE T1,PIMSK ;WAS IT?
SOS PIPC ;YES. MAKE IT GO BACK INTO WAIT THEN
MOVE FX,FORKX ;GET THIS FORK'S ID
SETZRO FKICO,(FX) ;CLEAR THIS CONDITION (NECESSARY
; IF THIS WAS DEFERRED).
XMOVEI T1,JOBCOF ;SET TO DEBREAK TO ACTION PROCEDURE
PIRLG1: SETZM PIOLDS ;MAKE FORK RUNNABLE
EXCH T1,PIPC
MOVX T2,MONENV ;SET AC BLOCKS FOR NEW FLAGS WORD
EXCH T2,PIFL ;GET FLAGS, SET NEW ONES FOR DEBREAK
TXNN T2,UMODF
IFSKP.
MOVEM T1,P5 ;IN USER MODE, SIMULATE JSYS
MOVEM T2,P3 ;Store new flags as well
JRST PIRQR
ENDIF.
MOVE T2,PIAC+17 ;IN MON MODE, SIMULATE PUSHJ
PUSH T2,T1
MOVEM T2,PIAC+17
MOVX T1,PCU ;GET THE MASK FOR PCU
IORM T1,PIFL ;AND TURN IT ON
JRST PIRQR
;LOGOUT REQUEST
;Here when PSILO% is set in FKINT
PIRLGO: DMOVE T1,PIFL
CALL TFTEST ;OK TO INTERRUPT?
JRST [ MOVE FX,FORKX ;NO, REMEMBER REQUEST
SETONE FKILO,(FX)
JRST PSIDFR]
XMOVEI T1,FLOGO
SETZM PIOLDS ;MAKE FORK RUNNABLE
MOVEM T1,PIPC
MOVX T2,MONENV ;SET AC BLOCKS FOR NEW FLAGS WORD
MOVEM T2,PIFL ;Set new ones for DEBREAK
MOVX P3,USRCTX ;Force reinit of stack at FLOGO
SETZM P5 ;Unique address for new PC
JRST PIRQR
;SPECIAL TEST USED BEFORE INTERRUPT TOP FORK FOR LOGOUT OR CARRIER OFF
TFTEST: CALL PITEST ;INTERRUPTABLE NORMALLY?
RET ;NO, NOT HERE EITHER
MOVX T2,LOGIOB
TDNE T2,JOBBIT ;LOGGING IN OR OUT?
RET ;YES, NO INTERRUPT
RETSKP ;NO, INTERRUPT OK
;DAP attention interrupt
;Here when PSIDP% is set in FKINT
FKDAP: DMOVE T1,PIFL
CALL PITEST ;interrupt OK now?
IFNSK.
MOVE FX,FORKX ;no, setup defer
SETONE FKIDP,(FX) ;keep request
JRST PSIDFR ;go set defer
ENDIF.
MOVX T1,PSIWT% ;see if process was waiting
TDNE T1,PIMSK ;was it?
SOS PIPC ;yes. make it go back into wait when finished
MOVE FX,FORKX ;get this fork's id
SETZRO FKIDP,(FX) ;clear interrupt condition bits
XMOVEI T1,DAPHND ;get addr of action procedure
JRST PIRLG1 ;set to debreak to action procedure
; JSYS TRAP REQUEST
;Here when PSIJT% is set in FKINT
;A process executed a JSYS that this process was monitoring. This process
;will receive an interrupt on the channel that it specified.
PIRJTP: DMOVE T1,PIFL ; Pick up flags
CALL PITEST ; FORK INTERRUPTABLE?
JRST PIRJT1 ; NO, DEFER IT
MOVE FX,FORKX ; IN CASE THIS PSI WAS DEFERRED
SETZRO FKIJT,(FX) ; CLEAR IT FROM FKINT
LOAD T1,JTMCN ; GET PSI CHANNEL FOR TRAP
MOVE T1,BITS(T1) ;
IORM T1,PSIBW ; SET BIT IN INT WAITING WORD
SETZ FX, ;
JRST PSII ; GO PROCESS THE TRAP
PIRJT1: MOVE FX,FORKX ; DEFER THE JSYS TRAP PSI
SETONE FKIJT,(FX)
JRST PSIDFR
;ADDRESS BREAK REQUEST - FREEZE FORK AND INTERRUPT SUPERIOR
;Here when ADRBK% is set in FKINT
PIRABK: MOVE T1,FX ;GET REQUEST BITS
MOVE FX,FORKX ; AND FORK INDEX
TXZ T1,FKPSI0+ADRBK% ;CLEAR BITS FOR THIS REQUEST
OPSTRM <IORM T1,>,FKINX,(FX) ;SAVE OTHERS
DMOVE T1,PIFL ;GET INTERRUPTED PC DOUBLEWORD
CALL PITEST ;INTERRUPTABLE?
JRST PIRBK1 ;NO
SETONE <FKFR1,FKFRA>,(FX) ;YES. INDICATE FREEZE DUE TO ADDRESS BREAK
SETZRO FKABK,(FX) ;CLEAR ORIGINAL REQUEST BIT
CALL FKTMI ;INTERRUPT SUPERIOR FORK
CALL UNPIRN ;LEAVE PSI CONTEXT
SETZM PIOLDS ;SET OLD STATE TO RUNNING
MOVEI T1,FRZWT ;WAIT LIST ON WHICH WE WISH TO LIVE
JRST DISMSE ;DISMISS
PIRBK1: SETONE FKABK,(FX) ;RE-LIGHT REQUEST BIT
JRST PSIDFR ;AND DEFER THE INTERRUPT
;PROCESS INTERRUPT(S) FOR THIS FORK AS SPECIFIED BY FKINTB
;THIS CODE *CAN* CAUSE PAGE FAULTS WHEN REFERENCING THE USER
;CHANNEL AND LEVEL TABLES.
;FX/ flags from FKINT
PSII: MOVE 1,MJRST0 ;NORMALIZE ALL DEFER TRAPS
MOVEM 1,MJRSTF
MOVE 1,INTDF0
MOVEM 1,INTDFF
XSFM T1 ;SEE IF CONTEXT BEING SETUP RIGHT
TXNE T1,PCU
TXNN T1,EXPCS
IFNSK.
IFN SKEDSW,<
BUG.(CHK,PSIIBE,SCHED,SOFT,<PSII - Flags not set properly>,<<T1,FLAGS>>,<
Cause: At PSII, the PC flags were found not set properly. All paths
to PSII should ensure that PCU is 1 and PCS is non-0. This
is under a debug conditional and so should not be seen in the
field.
Data: T1 - Flags from XSFM.
>)
> ;END DEBUG CONDITIONAL
MOVX T1,MONENV
JSP T2,[XJRSTF T1] ;MAKE THEM RIGHT
ENDIF.
;DETERMINE REASON FOR THE INTERRUPT AND GO PROCESS IT.
TXNE FX,SUSFK% ;FORK SUSPENSION REQUEST?
JRST PIRSFK ;YES
TXNE FX,PSILO% ;LOGOUT REQUEST?
JRST PIRLGO
TXNE FX,PSICO% ;CARRIER OFF REQUEST?
JRST PIRCOF ;YES
TXNE FX,PSIJT% ; JSYS trap requested?
JRST PIRJTP ; Yes
TXNE FX,ADRBK% ;ADDRESS BREAK REQUEST?
JRST PIRABK ;YES, HANDLE
TXNE FX,PSIDP% ;DAP attention ?
JRST FKDAP ;yes. handle it
;HERE BECAUSE BIT PSIIF% IS SET IN FKINT, INDICATING A CHANNEL
;INTERRUPT. FKINTB HAS BIT SET FOR EACH CHANNEL THAT NEEDS TO
;INTERRUPT.
MOVE 2,FORKX
MOVEI 1,0
OPSTRM <EXCH 1,>,FKIBX,(2) ;RESET FKINTB TO 0
IORM 1,PSIBW ;INCLUDE IN PROCESS WAITING BREAKS
MOVE 1,PSICHM ;USERS ENABLED CHANNELS
IOR 1,CHNSON ;WITH ALWAYS ON CHANNELS
IOR 1,SUPCHN ;WITH SUPERIOR RESERVED CHANNELS
AND 1,PSIBW ;FLUSH DISABLED CHANS
TDNN 1,MONCHN ;MONITOR CHANNEL?
SKIPN 3,PIOLDS ;NO. WAS FORK WAITING?
IFSKP.
SKIPN FORKN ;AND NOT TOP FORK?
ANSKP.
MOVEI 3,0(3) ;YES, HALT OR FORCED TERM?
CAIE 3,HALTT
CAIN 3,FORCTM
JRST PIRQR ;YES. IGNORE REQUEST UNTIL LATER
ENDIF.
MOVEM 1,PSIBW ;FLUSH DISABLED CHANS
JUMPE 1,PIRQR ;RETURN IF NO BREAKS WAITING
;..
;..
;Here when an interrupt is pending and it is enabled (or a panic channel)
DMOVE 1,PIFL ;PROCESS PC
CALL PITEST ;CAN PROCESS BE INTERRUPTED NOW?
JRST PSIDFR ;NO, GO SETUP DEFERRED INTERRUPT
MOVE 1,PSIBW
TDNE 1,MONCHN ;MONITOR RESERVED CHANNEL?
JRST PSIMB ;YES
TDNN T1,CHNSON ;PANIC CHANNEL?
JRST PSIN5 ;NO
;Panic channel. If ERJMP follows user's instruction, go there.
DMOVE T1,PIFL ;YES, CHECK FOR ERJMP/ERCAL
TXNE T1,UMODF ;USER PC NOW?
IFSKP.
DMOVE T1,UPDL ;NO, GET IT
EXCH T1,T2 ;(IN PROPER ORDER)
ENDIF.
CALL SETPCV ;SET PREVIOUS CONTEXT FOR ITRSIM
CALL ITRSIM ;CHECK AND INTERPRET ER INSTRUCTION
JRST PSIN6 ;NONE THERE, CONTINUE WITH INTERRUPT
MOVEM T3,PIPC ;FOUND, SET PC TO E OF INSTRUCTION
MOVEM T1,PIFL ;AND FLAGS TO USER FLAGS
MOVE T3,CHNSON ;CLEAR INTERRUPT REQUEST
ANDCAM T3,PSIBW
JRST PIRQR ;RETURN TO USER
;Not a panic channel, or panic channel with no ERJMP. Terminate the process if
;it can't take the interrupt or the superior wants it.
PSIN6: MOVE T1,PSIBW
PSIN5: AND 1,SUPCHN ;LOOK AT SUPERIOR RESERVED CHANS
JUMPN 1,PSIN3 ;TERMINATE IF ANY
MOVE 1,PSIBW
AND 1,CHNSON ;LOOK AT SPECIAL CHANNELS
SKIPE PSISYS ;IF THIS PROCESS NOT TAKING PSI'S,
JUMPN 1,PSIN3 ;TERMINATE IT IF ANY SPECIALS
ANDCM 1,PSICHM ;AND'ING WITH USER'S 'OFF' CHANNELS
JUMPN 1,PSIN3 ;TERMINATE CAUSE CHANNEL NOT ACTIVE
SKIPE PSISYS ;PSI SYSTEM ON?
JRST PIRQR ;NO
SKIPN PSLEVT ;THIS PROCESS TAKING INTERRUPTS?
JRST PSIN1 ;NO, GO TRANSMIT THE PSI
;..
;..
;PSIBW (AND AC 1) HAS A BIT SET FOR EACH CHANNEL TO GIVE AN INTERRUPT.
;CHECK THEM ALL TO FIND THE HIGHEST PRIORITY (LOWEST LEVEL NUMBER)
MOVE 1,PSIBW ;GET CHANNELS NEEDING INTERRUPTS
MOVEI 2,0 ;INIT CHANNEL NUMBER
MOVSI 3,1 ;INIT LOWEST LEVEL
PSIS4: JFFO T1,PSIS2 ;JUMP WITH FIRST CHN FOUND IN T2
JRST PSIS10 ;NO MORE. GO FINISH
;T2/ CHANNEL NUMBER
;T3/ PREVIOUS LOW LEVEL NUMBER
PSIS2: ANDCM T1,BITS(T2) ;DON'T LOOK AT THIS BIT NEXT TIME
MOVE 4,PSCHNT ;GET ADR OF USER'S CHANNEL TABLE
ADDI 4,0(2) ;COMPUTE ADR OF USER'S CHANNEL WORD
UMOVE T4,@T4 ;GET LEVEL NUMBER FOR THIS CHANNEL
ERJMP PSIN1
JN PSXSIR,,[
LOAD T4,SILEV,T4 ;GET LEVEL NUMBER
JRST PSIS3]
HLRZS T4 ;GET LEVEL NUMBER
PSIS3: CAILE 4,NPILEV ;LEGAL LEVEL?
SETZ 4, ;NO, TREAT AS 0
CAIG 3,0(4) ;OLD LEVEL GREATER THAN CURRENT?
JRST PSIS4 ;NO
MOVEI 3,0(4) ;YES, REMEMBER NEW LEVEL
MOVEI Q1,0(2) ;AND CHANNEL NUMBER
JRST PSIS4 ;RESUME SCAN
;HERE WHEN ALL BITS HAVE BEEN LOOKED AT.
;T3/ LEVEL OF HIGHEST PRIORITY INTERRUPT FOUND
;Q1/ CORRESPONDING CHANNEL NUMBER
PSIS10: JUMPE 3,PSID1 ;NO LEVEL ASSIGNED? GO XMIT INTERRUPT
MOVE 1,BITS(3)
CAMG 1,PSIBIP ;OK TO BREAK ON THIS LEVEL?
JRST [ MOVE 2,PSIBW ;NO, .GE. PRIORITY LEVEL IN PROGRESS
TDNN 2,CHNSON ;BREAKS ON PANIC CHNS WAITING?
JRST PIRQR ;NO, HOLD WAITING BREAKS
MOVE 1,2
JRST PSIN3] ;YES, MUST TERMINATE
IORM 1,PSIBIP ;YES, REMEMBER BREAK THIS LEVEL
MOVE 1,PSCHNT ;GET ADR OF USER'S CHANNEL TABLE
ADDI 1,0(Q1) ;COMPUTE ADR OF USER'S CHANNEL WORD
UMOVE T4,@1 ;GET LEVEL + ADDR OF USER'S INT ROUTINE
ERJMP PSIN1 ;IF FAILED, TERMINATE
JN PSXSIR,,[
ANDX T4,SIADR ;IF EXTENDED, GET ROUTINE ADDRESS
JRST PSIS9]
HLL T4,PSCHNT ;APPLY SECTION USED IN SIR JSYS
;User has provided routine address for this level.
; T4/ address
;Set up PIPC to go to the interrupt routine provided in user's CHNTAB
PSIS9: MOVE 1,PIFL ;GET FLAGS WHEN INTERRUPTED
EXCH 4,PIPC ;GET PC WHEN INTERRUPTED,SAVE NEW PC
TLNN 1,(UMODF) ;WAS IN USER MODE?
JRST PSISM ;NO, MUST SAVE MONITOR CONTEXT
;This removes op code and AC, which may have been in the flags word if it
;came from FFL. This may not be necessary on the KL. On the KC, it is wrong
IFN KLFLG,<
HLLZM T1,PIFL ;PRESERVE USERS FLAGS
> ;END OF IFN KLFLG
;..
;HERE WHEN MONITOR CONTEXT HAS BEEN SAVED (IF NECESSARY). READY TO
;STORE PC INTO USER'S LEVTAB. PIFL AND PIPC ARE SET UP FOR GOING TO
;USER'S INTERRUPT ROUTINE.
; T1/ FLAGS TO GO INTO LEVTAB
; T4/ PC TO GO INTO LEVTAB
; Q1/ CHANNEL NUMBER
;..
PSIS5: SETZM PIOLDS
MOVE 2,PSLEVT ;GET ADR OF USER'S LEVEL TABLE
ADDI 2,-1(3) ;COMPUTE ADR OF USER'S LEVEL WORD
UMOVE 2,@2 ;GET ADR OF PC WORD FOR THIS LEVEL
ERJMP PSIN1 ;IF FAILED, TERMINATE
JN PSXSIR,,[
ANDX T1,EXFLBT ;DON'T RETURN BITS THE USER SHOULDN'T SEE
UMOVEM T1,@T2 ;SAVE FLAGS WORD
ERJMP PSIN1 ;QUIT IF FAILED
AOS T2
UMOVEM T4,@T2 ;SAVE PC WORD
ERJMP PSIN1 ;QUIT IF FAILED
JRST PSID3]
HRR T1,T4 ;COMBINE PC
XOR T4,PSLEVT ;SEE IF SECTIONS ARE THE SAME
TLNE T4,-1 ;ARE THEY?
JRST PSIN1 ;NO. ERROR THEN
HLL T2,PSLEVT ;FORCE CORRECT SECTION
UMOVEM 1,@2 ;STORE BREAK PC IN USER'S MEMORY
ERJMP PSIN1 ;IF FAILED, TERMINATE
PSID3: MOVE 1,BITS(Q1) ;CLEAR WAITING BREAK BIT FOR THIS CHANNEL
ANDCAM 1,PSIBW
JRST PIRQR ;TO USER
;MONITOR ROUTINE IS SHORTSTOPPING INTERRUPTS
;MONBK/ 30 bit address of interrupt routine (include section number !!)
;Copy new PC to PIPC, and new flags to PIFL
;Store old flags in ITFFL, and old PC in ITFPC
PSIMB: MOVX T1,MONENV ;COOK UP NEW FLAGS
EXCH T1,PIFL ;GET OLD FLAGS & SET UP NEW FLAGS
MOVE T2,MONBK ;GET ROUTINE ADDRESS (30 BIT ADDRESS)
EXCH T2,PIPC ;GET OLD PC - SET NEW PC
DMOVEM T1,ITFFL ;SAVE OLD FLAGS & OLD PC
SETZM PIOLDS ;WE WERE RUNNING BEFORE PSI.
JRST PIRQR ;GO TO IT.
;HERE WHEN INTERRUPTED OUT OF MONITOR CONTEXT. SAVE ALL RELEVANT
;INFO BEFORE GIVING THE INTERRUPT.
;THIS CODE SAVES ONTO A SPECIAL PSI STACK. IT USES AC FX AS ITS STACK
;POINTER. THE DEBRK JSYS USERS THIS INFORMATION TO CONTINUE THE INTERRUPTED
;JSYS
;T1/ FLAGS AT TIME OF INTERRUPT (FROM PIFL)
;T4/ PC AT TIME OF INTERRUPT (FROM PIPC)
PSISM: HLRZ 2,BITS(3) ;NO, REMEMBER MONITOR INTERRUPT
IORM 2,PSIBIP ;IN RH OF BIP WORD
MOVE FX,PSIPT ;STORAGE STACK POINTER
MOVE P1,FX ;SAVE CURRENT STACK POINTER
PUSH FX,1
PUSH FX,4 ;SAVED PC AND FLAGS
;SAVE A SET OF IMPORTANT CELLS. SAVCT CONTAINS A LIST OF THEM.
MOVSI Q2,-NSAVC ;SAVE VULNERABLE CELLS
PUSH FX,@SAVCT(Q2)
AOBJN Q2,.-1
;SAVE THE UPDL STACK
MOVSI Q2,UPDL ;STORE ENTIRE MONITOR STACK
HRRI Q2,1(FX)
ADD FX,[XWD NUPDL,NUPDL]
JUMPGE FX,PIOVFW ;IF POSITIVE NO ROOM
BLT Q2,0(FX)
;STORE THE CURRENT CONTEXT AC'S AT THE TIME OF THE INTERRUPT (IN PIAC)
MOVSI 1,PIAC ;STORE CURRENT MONITOR AC'S
HRRI 1,1(FX) ;NOW LIVING IN PIAC
ADD FX,[XWD 20,20]
JUMPGE FX,PIOVFW ;IF POSISTVE NO ROOM
BLT 1,0(FX)
;..
;SAVE ALL AC BLOCKS (THOSE IN ACBAS BLOCKS AND PREVIOUS
;CONTEXT AC'S)
;..
HRRZ 1,ACBAS ;STORE ALL AC BLOCKS IN USE
SUBI 1,<UACB>B39-1 ;COMPUTE NUMBER BLOCKS IN USE
JUMPLE 1,PSISM1 ;JUMP IF NONE
;Copy previous context AC's onto the PI stack.
ADD FX,[20,,20] ;POINT TO END OF BLT
JUMPGE FX,PIOVFW ;IF POSITIVE NO ROOM
STPAC. T2,-17(FX) ;COPY PREVIOUS AC'S TO THE STACK
;Load previous context AC's saved during JSYS entry
LDPAC. T2,UACB ;LOAD PREVIOUS CONTEXT AC'S
;Copy all AC blocks (saved in UACB during nested JSYS entry) onto the PI stack
MOVSI 2,UACB ;SETUP TO BLT ENTIRE AC STACK
HRRI 2,1(FX) ; .. TO PSI STACK ..
LSH 1,4 ;COMPUTE NUMBER WORDS IN USE
HRLI 1,0(1) ;NUMBER OF WORDS BOTH HALFS
ADD FX,1
JUMPGE FX,PIOVFW ;IF POSITIVE NO ROOM
BLT 2,0(FX)
;Set up to return to user mode
PSISM1: PUSH FX,1 ;SAVE COUNT FOR DEBRK
PUSH FX,ACBAS ;AND CURRENT ACBAS
MOVE 1,UPP ;RESET MON STACK
MOVEM 1,PIAC+P
MOVE 1,UPDL+1 ;USER FLAGS AT MONITOR CALL
ANDX T1,EXFLBT ;GET ONLY FLAGS BITS
TXO T1,USRCTX ;MAKE DAMN SURE IT'S USER MODE
MOVEM T1,PIFL ;PRESERVE USERS FLAGS
MOVE T4,UPDL ;GET PC AT JSYS ENTRY
PUSH FX,P1 ;PSI STACK BEFORE ALL THIS PUSHING
PUSH FX,1 ;SAVE FLAGS AT JSYS ENTRY
PUSH FX,T4 ;SAVE PC AT JSYS ENTRY
MOVEM FX,PSIPT ;SAVE CURRENT STACK POINTER
TXZ T1,USRCTX ;SO HE CAN TELL IT WAS MON INTERRUPT
SETOM SLOWF
JRST PSIS5 ;FINISH INTERRUPT START
;At this point,
; PIFL/ flags from top of UPDL with user context forced on
; PIPC/ New PC as provided by user's channel table
; T1/ flags from top of UPDL with user context forced off
; T4/ PC from the top of UPDL
;T1 and T4 will be stored into the user's LEVTAB
PIOVFW: BUG.(HLT,PSISTK,SCHED,HARD,<PSI STORAGE STACK OVERFLOW>,,<
Cause: A software interrupt occurred while a process was running
in the monitor. The monitor is saving information regarding
the state of the process so that in can restore that state
when the process dismisses the interrupt. The BUGHLT indicates
that the storage area has overflowed.
>)
;THIS FORK WON'T TAKE INTERRUPT, DISMISS IT AND RECORD WHY
;Get the channel number
PSID1: MOVEI 2,0(Q1) ;CHANNEL WITH NO LEVEL ASSIGNED
JRST PSIN2
;Determine channel number from waiting interrupts
PSIN1: MOVE 1,PSIBW ;INTERRUPTS OFF OR NO LEVCHN
PSIN3: JFFO 1,.+1 ;CALCULATE CHANNEL NUMBER
;T2/ channel number on which interrupt was attempted
PSIN2: MOVEM 2,FORCTC ;SAVE CHANNEL NUMBER FOR STATUS
MOVE 1,BITS(2) ;JUST ONE CHANNEL AT A TIME
ANDCAM 1,PSIBW ;RESET WAITING BIT
MOVE 1,CAPENB
TLNE 1,(1B17) ;SUPERIOR WANTS FROZEN STEAD HALT?
JRST [ CALL FKTMI ;YES. GO INTERRUPT IT THEN
MOVEI 3,FRZWT ;AND GET PROPER STATUS
JRST PIRSK1] ;AND GO DO THE FREEZE
CALL GETSFX ;GET SUPERIOR FORK INDEX
MOVE Q2,1 ;SAVE IT
CALL UNPIRN ;LEAVE PI STATE, MOVE AC'S ETC.
MOVE P,PI7P
MOVE 1,Q2 ;RECOVER SUPERIOR FORK INDEX
HRRI 1,FORCTM
JRST DISMSE ;THIS ONE IS BEING DISMISSED
;GET SUPERIOR FORK INDEX FOR HALT OR FORCED TERMINATION
GETSFX: HRRZ 1,FORKN
ADD 1,SUPERP ;MAKE POINTER TO SUPERIOR
LDB 1,1
HRLZ 1,SYSFK(1) ;PUT INDEX IN LH FOR DISMISS TEST WORD
RET
FORCTM::JRST 0(4) ;SCHEDULER TEST FOR FORCED TERM FORK
;INTERRUPT SUPERIOR FORK ON TERMINATION
FKTMI:: HRRZ 1,FORKN
SKIPE MONCHN ;MONITOR CHANNELS ACTIVATED
JRST [ MOVEI T1,^D35 ;YES GIVE CH 35 INTERRUPT TO THIS FORK
MOVE T2,FORKX
CALLRET PSIRQ]
SKIPN 1 ;OR
SKIPA 1,[^D35] ;TERMINATING TOP FORK, GIVE CH 35
MOVEI 1,TRMINT ;19 IS FORK TERMINATED
CALL PSIT ;TRANSMIT IT
RET
;XMIT INTERRUPT TO SUPERIOR FORK
PSIT: HRRZ 2,FORKN
ADD 2,SUPERP ;GET SUPERIOR
LDB 2,2
HRRZ 2,SYSFK(2) ;SYSTEM FORK INDEX
CALLRET PSIRQ ;REQUEST INTERRUPT
;CONSTRUCT BYTE PTR TO CHANNEL NUMBER FOR TERM CODE
; 1/ TERMINAL CODE
; CALL GETCHA
; RETURN +1: ALWAYS, 2/ BYTE PTR TO CHANNEL NUMBER
GETCHA::MOVEI 2,0(1)
IDIVI 2,6
ADDI 2,PSICHA
HLL 2,CH6TAB(3)
RET
;DEFERRED INTERRUPT LOGIC
;SET TRAPS TO RECHECK INTERRUPTS WHEN STATE CHANGES
;HERE WHEN PROCESS IS NOINT AND CAN'T TAKE AN INTERRUPT. SET UP INTDFF
;AND MJRSTF TO HANDLE THIS LATER
PSIDFR: MOVE 1,MJRST1
MOVEM 1,MJRSTF
MOVE 1,INTDF1
MOVEM 1,INTDFF
CALL UNPIRN ;LEAVE BREAK STARTING STATE
SETONE FKPS1,(FX) ; BUT LEAVE PENDING BIT
CALL CHKBMP ;SEE IF NEED PI BUMPING AGAIN
NOP
JRST PSIDF1 ;RESUME
;These are two possible contents of MJRSTF. JSYS return executes this
;location. MJRST0 causes a return to the previous context. If a process
;is NOINT when an interrupt occurs, PSIDFR stores MJRST1 in MJRSTF (see
;above). WHen the process executes MJRSTF, the code at PSISV0 is executed.
MJRST0: XJRSTF FFL ;NORMAL CONTENTS OF MJRSTF
MJRST1: JRST PSISV0 ;TRY FOR INTERRUPT NOW
;These are two possible contents of INDTFF. The OKINT macro executes this
;location. INTDF0 decrements the noint count. If a process is NOINT when an
;interrupt occurs, PSIDFR stores INTDF1 in INTDFF (see above). When the
;process executes an OKINT, the code at PSISV1 is executed, and the flags
;and PC are stored in PIFL/PIPC.
INTDF0: SOS INTDF ;NORMAL CONTENTS OF INTDFF
INTDF1: XPCW PIFL ;CONTENTS OF INTDFF WHEN TRAP SET
;PIPC+1 CONTAINS JRST PSISV1
;HERE WHEN PROCESS DID AN OKINT AND THERE WAS AN INTERRUPT PENDING FOR
;THE PROCESS. DON'T LET IT TAKE IF PROCESS IS STILL NOINT.
PSISV1:
IFN KLFLG,<
DATAO PAG,SETMON ;SET MON AC BLOCK CURRENT
> ;END OF IFN KLFLG
SOSL INTDF
XJRSTF PIFL ;IF STILL NOINT, PROCEED
JRST PSISV2 ;GO ON
;HERE WHEN PROCESS WENT TO MRETN (TO RETURN FROM A JSYS OR UUO),
;AN INTERRUPT WAS PENDING, AND THE PROCESS HAS BEEN NOINT UNTIL NOW.
;IF JSYS WAS NESTED (I.E., PROCESS IS NOT RETURNING TO USER) AND
;PROCESS IS STILL NOINT, DON'T LET THE INTERRUPT TAKE.
PSISV0:
IFN KLFLG,<
DATAO PAG,SETMON ;SET MON AC BLOCK CURRENT
> ;END OF IFN KLFLG
DMOVEM 1,PIFL ;SAVE AC1
DMOVE 1,FFL ;FFL NOW CONTAINS USER'SPC
TXNE T1,UMODF ;A USER-MODE PC?
IFSKP.
SKIPGE INTDF ;NO. NOW INTERRUPTABLE?
ANSKP.
DMOVE T1,PIFL ;NO. RECOVER AC CONTENTS
XJRSTF FFL ;AND RETURN FROM MUUO
ENDIF.
EXCH 1,PIFL ;COPY FFL TO PIFL, RESTORE AC
EXCH 2,PIPC ;COPY FPC TO PIPC, RESTORE AC
;..
;Allow deferred interrupt to happen
;..
PSISV2: MOVEM P,PIAC+17 ;SAVE USER'S AC17
MOVEI P,PIAC ;AND AC'S 0-16
BLT P,PIAC+16
MOVE P,PIPDL ;RESTORE INTERRUPT STARTING STATE
MOVE P2,TRAPFL
MOVE P3,KIMUFL
MOVE P4,TRAPPC ;SAVE VULNERABLE CELLS
MOVE P5,KIMUPC
MOVE P6,KIMUEF
SETZM PIOLDS
PSISV3: MOVE 2,FORKX
LOAD FX,FKINX,(2)
XJRSTF [MONENV ;ESTABLISH PROPER CONTEXT
MSEC1,,PSII] ;AND ENTER MAIN SEQUENCE
;TEST FOR IMMEDIATE OR DEFERRED INTERRUPT
;SKIP => IMMEDIATE
;NOSKIP => DEFERRED
;CALLED WITH TEST USER PC IN AC1,AC2
PITEST::TLNE 1,(UMODF) ;USER MODE?
JRST [ SKIPE NSKED ;ARE WE NOSKED?
SKIPN PNSKDC ;YES. SHOULD WE BE BECAUSE OF RESOURCES?
RETSKP ;NO. SAY CAN INTERRUPT THEN
RET] ;YES. DEFER THE INT
SKIPL SLOWF ;NO, SLOW CODE?
SKIPL INTDF ;YES, INTERRUPTABLE
RET ;NO, DEFER
SKIPN CRSKED
SKIPE NSKED ;IN CASE NOSKED W/O NOINT
BUG.(CHK,PSINSK,SCHED,HARD,<PSI FROM NOSKED OR CRSKED CONTEXT>,,<
Cause: This process is NOSKED or CSKED, but is not NOINT.
>)
JRST RSKP ;IMMEDIATE
;TEST FOR PI BUMPING NEEDED
; FX/ FORK INDEX
CHKBMP: LOAD CX,FKINX,(FX)
TXNE CX,SUSFK%!PSILO%!PSIT1%!PSIT2%!PSIDP%!PSIPRI ;ANY INTERRUPT BITS ON?
TXNE CX,FKPSI1 ;AND NOT DEFERRING
JRST [ SETZRO PIBMP ;MAKE SURE BIT IS OFF
RET]
SETONE PIBMP ;YES. BUMP IT
RETSKP ;AND INFORM CALLER OF SAME
;DEBREAK
.DEBRK::MCENT
SKIPN PSIBIP ;ANY BREAKS IN PROGRESS?
ITERR DBRKX1 ;NO, ERROR
SETPCS MSEC1A ;SET PCS TO 1 SO PXCT [BLT] WORKS
MOVE 2,FORKX
SETONE FKPS1,(2) ;SET INTERRUPT STARTING BIT
SETZM PIOLDS
MOVE 2,PSIBIP ;BREAKS NOW IN PROGRESS
JFFO 2,.+1 ;FIND HIGHEST ONE
MOVE 1,PSLEVT ;COMPUTE ADDRESS OF RETURN PC
ADDI 1,-1(3)
UMOVE 1,@1
JN PSXSIR,,[
XCTU [DMOVE Q1,@T1]
ERJMP [MOVE T2,FORKX ; get fork # back
MOVX T1,FKPSI1 ; no longer uninterruptable
ANDCAM T1,FKINT(T2) ; so prevent us from hanging
MOVE T1,LSTERR ; get the last error
ITERR ()] ; and generate an interrupt
ANDX Q1,EXFLBT ;GET ONLY THE FLAG BITS
JRST DEBRK2]
HRRZS 1 ;IF OLD STYLE, FORCE SECTION 0 ADDRESS
UMOVE Q1,@1 ;GET RETURN PC FROM USER MEMORY
HRRZ Q2,Q1 ;SAVE THE PC HERE
ANDX Q1,EXFLBT ;GET ONLY THE FLAG BITS
HLL Q2,PSLEVT ;APPLY SECTION THAT WAS LOST WHEN STORED
DEBRK2: MOVS 2,BITS(3)
TDNE 2,PSIBIP ;WAS THIS MONITOR INTERRUPT?
JRST DEBRK6 ;YES, GO UNWIND
;HERE TO RETURN CONTROL TO THE USER PROGRAM.
;Q1/ FLAGS FROM LEVTAB
;Q2/ PC FROM LEVTAB
;SEND USER TO THIS LOCATION PRESERVING CERTAIN FLAGS IF THEY WERE
;ON AT ENTRY TO DEBRK
DEBRK3: MOVE T2,0(P) ;GET FLAGS FROM JSYS ENTRY
MOVE P,PIPDL ;ESTABLISH PI STACK
XOR Q1,T2 ;KEEP PRIVILEGED BITS FROM THIS CALL
TXZ Q1,UMODF+UIOF+PC%AFI+37777777B35 ;SAVE RIGHT HALF FLAGS, TOO
XOR Q1,T2
MOVEM Q1,PIFL ;SET THIS AS FLAGS FOR PROCEEDING
MOVEM Q2,PIPC ;SET TO DEBREAK AT THAT ADDRESS
SETOM SLOWF ;NORMALIZE FLAGS FOR RETURN TO USER
SETOM INTDF
MOVE 1,UPP
MOVEM 1,PIAC+P
DEBRK4: MOVE 1,BITS(3)
ANDCAM 1,PSIBIP ;CLEAR BIP THIS LEVEL
JRST PSISV3 ;GO CHECK FOR OTHER INTERRUPTS AND RETURN
;HERE BECAUSE INTERRUPT OCCURRED OUT OF MONITOR CONTEXT. PSISM SAVED
;CONTEXT ON PSI STACK. IF PC IN LEVTAB HAS BEEN CHANGED, DON'T CONTINUE
;IN MONITOR. IF UMODF IS ON, USER MUST HAVE SET IT, BECAUSE PSISM
;CLEARED IT BEFORE PUTTING IT IN LEVTAB. PSI STACK CONTAINS FLAGS AND
;PC AT TOP OF UPDL WHEN INTERRUPT OCCURRED. THESE WERE PUT INTO LEVTAB
;BY PSISM.
;Q1/ FLAGS FROM USER'S LEVTAB
;Q2/ PC FROM USER'S LEVTAB
DEBRK6: ANDCAM 2,PSIBIP ;CLEAR MON BREAK FLAG FOR THIS LEVEL
MOVE FX,PSIPT
POP FX,T4 ;PC AT TOP OF UPDL WHEN INTERRUPT
POP FX,T2 ;FLAGS AT TOP OF UPDL WHEN INTERRUPTED
POP FX,PSIPT ;TOP OF THIS BLOCK OF PSI STORAGE
TLOE Q1,(UMODF) ;IF IT WAS DIDDLED AT ALL,
JRST DEBRK5
ANDX T2,EXFLBT ;GET ONLY THE FLAG BITS
CAMN Q1,T2 ;DO FLAGS MATCH?
CAME Q2,T4 ;YES. PC MATCH?
;HERE WHEN PC HAS BEEN CHANGED. DON'T PROCEED IN THE MONITOR ROUTINE
;THAT WAS INTERRUPTED. RELEASE ANY RESOURCES THAT THE PROCESS OWNS, AND
;GO SEND THE PROCESS TO THE ADDRESS IN LEVTAB.
DEBRK5: JRST [ MOVE T1,FORKX ;GET FORK HANDLE
HLLZ T2,PSIBIP ;TELL THEM WHAT INTERRUPT LEVEL WE'RE AT
TDZ T2,BITS(T3) ;POINT TO LEVEL WE'RE GOING TO
PUSH P,T2 ;SAVE FOR CALL TO GOKFRE
CALL JSBSTF ;GO PROCESS DEALLOCATION STACK
MOVE T1,FORKX ;GET FORK HANDLE
POP P,T2 ;GET CORRECT LEVEL
CALL GOKFRE ;FREE GETOK ENTRIES
JRST DEBRK3] ;DON'T RESUME MON ROUTINE
;HERE WHEN INTERRUPT OCCURRED FROM MONITOR CONTEXT, AND WE ARE
;RESUMING THE MONITOR ROUTINE. RESTORE CONTEXT AS SAVED BY PSISM
;ON SPECIAL PSI STACK
MOVE P,PIPDL ;ESTABLISH PI PDL
POP FX,ACBAS
POP FX,4 ;GET NUMBER OF WORDS FOR AC BLOCKS
;..
;RESTORE AC STACKS
;..
JUMPLE 4,PDBK1 ;JUMP IF NO AC STACK TO RESTORE
SUB FX,4
;Restore AC blocks that had been saved at JSYS entry
MOVEI Q1,UACB
HRLI Q1,1(FX)
ADDI 4,0(Q1)
HRRZS T4
BLT Q1,-1(4) ;RESTORE AC BLOCKS
;Copy previous context AC's to UACB block
STPAC. Q1,UACB ;SAVE PREVIOUS CONTEXT AC'S
;Load previous context AC block from PI stack
SUB FX,[20,,20] ;COMPUTE START OF WHERE AC'S ARE
LDPAC. T2,1(FX) ;LOAD PREVIOUS CONTEXT AC'S FROM STACK
;Restore current context AC's from PIAC
PDBK1: SUB FX,[XWD 20,20]
MOVEI 2,PIAC
HRLI 2,1(FX)
BLT 2,PIAC+17 ;RESTORE MONITOR AC'S
;RESTORE UPDL STACK
SUB FX,[XWD NUPDL,NUPDL]
MOVEI 2,UPDL
HRLI 2,1(FX)
BLT 2,UPDL+NUPDL-1 ;RESTORE STACK
;RESTORE SPECIAL CELLS
MOVEI 2,NSAVC-1 ;RESTORE VULNERABLE CELLS
POP FX,@SAVCT(2)
SOJGE 2,.-1
POP FX,2 ;GET PC AT TIME OF INTERRUPT
MOVEM 2,PIPC ;SAVE PC (PROCESS WILL GO THERE)
POP FX,2 ;GET FLAGS AT TIME OF INTERRUPT
MOVEM 2,PIFL ;SAVE FLAGS
SETZM SLOWF
SETOM INTDF ;BE OKINT
JRST DEBRK4 ;NOW DEBRK
;TABLE OF VULNERABLE CELLS
SAVCT: MPP
PIOLDS
P2 ;TRAPFL
P3 ;KIMUFL
P4 ;TRAPPC
P5 ;KIMUPC
P6 ;KIMUEF
IFN KCFLG,<
KIMOAC
>
NSAVC==.-SAVCT
SUBTTL JSYS trapping
; Jsys Traps support code (TRAPSI, JTLOCK, JTULCK, etc)..
;TRAP AND PSI ROUTINE EXECUTED WHEN A FORK EXECUTES A TRAPPED JSYS
;CALLED AS FIRST CODE EXECUTED BY THE TRAPPED JSYS (WITH IT'S CONTEXT
;BUT TOTALLY INVISIBLE TO IT)
;P1/ ADDRESS OF FORK'S JTB + P2
;P2/ OFFSET FOR THIS JSYS NUMBER
;P3/ BIT MASK FOR THIS JSYS NUMBER
;P4/ MONITOR'S FORKN
;P5/ TRAP HANDLED FLAG
;P6/ OFFSET TO MONITOR'S PSB
TRAPSI::NOINT ;DON'T INTERRUPT THIS CODE
SUBI P1,(P2) ;GET BACK ADDRESS OF JTB WITHOUT OFFSET
SKIPA P5,[0] ;TRAP HANDLED IF NON-ZERO
TRPSI2: MOVE P1,FKJTB(P4) ;pointer to monitor's JTB
JUMPE P1,TRPSI6 ;if he's not monitored were done
LOAD P4,JTIMP,(P1) ;forkn of monitor's monitor
ADDI P1,(P2) ;add in offset to bit table
TDNN P3,JTBIM(P1) ;HANDLED BY THIS MONTIOR?
JRST TRPSI2 ;no, keep looking up the chain of monitors
SETO P5, ;YES, INDICATE TRAP HANDLED
MOVEI T1,0(P4)
CALL SETLF1 ;MAP PSB OF THE MONITOR
MOVE P6,T1 ;SAVE POINTER TO MONITOR'S PSB
TRPSI4: LOAD T2,JTMCN,(P6)
CAIN T2,77 ;IS CHANNEL SPECIFIED?
JRST TRPSI2 ;NO, DON'T PSI, SEARCH FOR ANOTHER MONITOR
CALL JTLOCK ;YES, SYNCH WITH OTHER TRAPPING FORKS
JRST TRPSI4 ;FORK SUSPENDED AND RESUMED
;WHILE QUEUED, RETRY LOCKING
JSP CX,FRZPSI ;FREEZE SELF AND PSI MONITOR
;RESUMED HERE AFTER TRAP HANDLED IF MONITOR DOES NOT CHANGE PC
;WHEN CONTROL RETURNS TO TRPSI5 ACS P1-5 MUST BE THE SAME AS TRPSI3
TRPSI5::JRST TRPSI2 ;LOOK FOR MORE MONITORS (OF MONITORS)
;RETURN TO THE NORMAL JSYS CODE
TRPSI6: SKIPL P5 ;HAS TRAP BEEN HANDLED AT ALL?
BUG.(CHK,TRPSIE,SCHED,HARD,<NO MONITOR FOR TRAPPED FORK>,,<
Cause: This BUG is not documented yet.
Action:
>)
LDB T1,[POINT 9,KIMUU1,26] ; Pick up opcode of trapped guy
CAIE T1,<JSYS>B62 ; Was a JSYS?
JRST TRPSI7 ; No, a UUO
LOAD T1,JTJNO
MOVE CX,JSTAB(T1) ;GET NORMAL DISPATCH
;Note: It may be necessary to work on this for the KC. It's not clear
;whether FFL has the right context always or not. But JSTAB no longer contains
;PCU, and FFL got PCU at MENTU, so this HLLZM no longer seems necessary. It
;also has the side-effect of clearing PCS.
; HLLZM CX,FFL ; Restore normal flags
; TXZ CX,EXFLBT
MOVEM CX,FPC ; And dispatch
XCTU [DMOVE T1,1] ;RESTORE STANDARD 4 ARGS
XCTU [DMOVE T3,3]
SETZM INTDF ;RESTORE STATE TO ENTRY AT TRAPSI
OKINT ;TURN PSIS BACK ON
XCT MJRSTF ;DO NORMAL DISP FOR THIS JSYS
TRPSI7: SETOM SLOWF ; Untangle ourselves
MOVE P,MPP ; in a state like this
POP P,FFL ; Reset flags
POP P,FPC ; And caller
MOVE P,UPP ; Reset the stack...
SETZM INTDF
OKINT
JRST U10501 ; Return to handle the UUO
;FREEZE AND PSI ROUTINE - FORK INITIATES JSYS TRAP PSI OF
;MONITOR AND THEN FREEZES ITSELF
;P4/ JOB INDEX OF FORK TO PSI
;P6/ OFFSET TO FORKS PSB
;INVOKED VIA JSP CX,FRZPSI (MAKES USE OF CX)
FRZPSI: MOVS T4,KIMUU1 ; Pick LH of instruction
HRR T4,KIMUU1+1 ; And then RH
MOVEM T4,JTTRW(P6) ; Set last trapped instruction
HRRZ T4,FORKN
STOR T4,JTFRK,(P6) ; Trapped fork index
STOR P4,JTMNI ;SAVE FORK WE TRAPPED TO FOR UTFRK
ENTSKD ;SAVE ACS ETC.
TXZ CX,EXFLBT ;CLEAR FLAGS IN CASE SECTION 0 CALLED
MOVEM CX,PPC ; Save return for DISMSE
MOVE CX,ENSKR ;GET THE RIGHT FLAGS (ENTSKD STORED THEM)
MOVEM CX,PFL ;FOR RESUME AFTER DISMSE
LOAD T2,JTMNI
HRRZ T2,SYSFK(T2) ;GET FORKX OF MONITOR FORK
MOVX T1,PSIJT%
CALL PSIGR ;MAKE SCHEDULER SEE IT
SETONE <FKPS1,FKFRJ>,(FX) ;DO "JSYS TRAP" FREEZE OF SELF
;FX=FORKX SET BY ENSKED
SETZM PIOLDS ;"OLD STATE" = RUNNING
MOVEI T1,FRZWT
JRST DISMSE ;DISMS
;JSYS TRAP LOCK AND UNLOCK ROUTINES
;WHEN A FORK TRIES JTLOCK AND SOME OTHER FORK HAS THE
;LOCK, THE FORK ADDS ITSELF TO A QUEUE (FKJTQ) AND BECOMES BLOCKED.
;WHEN THE LOCK IS CLEARED (BY A MONITORING FORK) THE QUEUE IS
;SCANNED FOR THE FIRST FORK (IF ANY) WAITING ON THE LOCK. THAT
;FORK IS REMOVED FROM THE QUEUE AND ALLOWED TO RUN.
;LOCK ROUTINE
;ON ENTRY TO JTLOCK:
;P4/ JOB FORK INDEX (OF FORK TO FIELD TRAP)
;P6/ PTR TO ITS PSB
;RET + 1 IF SUSPENDED AND RESUMED WHILE QUEUED
;RET + 2 WITH LOCK SET
JTLOCK: NOSKED
AOSE JTLCK(P6) ;TRY TO SEIZE THE LOCK
JRST JTLOC2 ;SOMEONE ELSE HAS IT
OKSKED ;GOT IT
JTLOC1: RETSKP
;Here when lock was already locked. Go add this process to the queue
JTLOC2: JSP CX,JTENQ ;PUT SELF ON JSYS TRAP QUEUE
JRST JTLOC1 ;RETURNS HERE WITH LOCK SEIZED
;IF FORK IS RESUMED AT JTRLCK, IT RETURNS + 1 TO TRAPSI ROUTINE
;FORCING ANOTHER CALL TO JTLOCK AFTER A CHECK TO SEE IF THE TRAP IS
;STILL TO GO TO THE SAME FORK.
JTRLCK: RET
;JTENQ - ROUTINE TO PLACE FORK ON QUEUE
;INVOKED VIA JSP CX,JTENQ (MAKES USE OF CX)
;This routine dismisses, with the process pointing to the instruction
;following the JSP that invoked it.
JTENQ: HRL T1,SYSFK(P4) ;1=FORK WAITING ON
ENTSKD ;ENTER SCHEDULER
TXZ CX,EXFLBT ;CLEAR FLAGS IN CASE SECTION 0 CALLED
MOVEM CX,PPC ; Save return for DISMSE
MOVE CX,ENSKR ;GET THE RIGHT FLAGS (ENTSKD STORED THEM)
MOVEM CX,PFL ;FOR RESUME AFTER DISMSE
SOSE NSKED ;MATCHED NOSKED IN JTLOCK
BUG.(HLT,JTENQE,SCHED,SOFT,<JTENQ WITH BAD NSKED>,,<
Cause: A process has attempted to lock the JSYS trap lock and found
it already locked. The process will enter a queue and dismiss until
the lock becomes available. The BUGHLT occurs because when the process
decrements its NOSKED counter, the value does not go to 0. This
means that the process is still NOSKED or it was OKSKED when it
should have been NOSKED.
>)
MOVEI T2,FKJTQ(FX) ;FX=FORKX, SET BY ENSKED
HRRM T2,@JTLSTL ;ADD THIS FORK TO END OF QUEUE
EXCH T2,JTLSTL ;SET NEW END OF QUEUE PTR
MOVSM T2,FKJTQ(FX) ;SET BACK PTR TO OLD QUEUE END
HRRI T1,JTQWT
JRST DISMSE ;DISMS
;JSYS TRAP QUEUE WAIT TEST
JTQWT: JE FKSUS,(FX),0(T4) ;DON'T WAKE IF NOT SUSPENDED BEFORE BLOCKING
SETONE <FKPS0,FKIWT>,(FX) ;WAS SUSPENDED. REINITIATE SUSPEND
SETZRO FKPS1,(FX) ;ALLOW PSI'S
PUSH P,3
CALL PSBUMP ;NO, GIVE FORK SOME PRIORITY
POP P,3
JRST 1(4)
;UNLOCK ROUTINE
;USES BUT DOES NOT SAVE ACS 1,2,3,4
JTULCK::HRRZ T2,FORKX
NOSKED
MOVE T1,JTLST ;SCAN QUEUE LOOKING FOR FORK
;WAITING ON EXECUIING FORK
JTULC1: JUMPE T1,JTULC3 ;NONE FOUND
MOVEI T4,0(T1)
SUBI T4,FKJTQ ;4=FORK INDEX OF QUEUED FORK
LOAD T3,FKSTD,(T4)
CAMN T3,T2 ;THIS FORK WAITING ON EX FORK?
JRST JTULC2 ;YES, REMOVE IT FROM QUEUE
LOAD T1,FKJTN,(T1) ;NO, TRY NEXT FORK
JRST JTULC1
JTULC2: CALL JTDEQ ;REMOVE FORK FROM QUEUE
PUSH P,FX ;UNBLOCK FORK
MOVE FX,T4
CALL UNBLK1
POP P,FX
CAIA
JTULC3: SETOM JTLCK ;NO FORKS ON QUEUE, CLEAR LOCK
OKSKED
RET
;REMOVE FORK WHOSE FKJTQ ENTRY IS PT'D TO BY 1 FROM JSYS TRAP QUEUE
;USES BUT DOES NOT SAVE ACS 1,2,3
JTDEQ: NOSKED
HRRZ T3,(T1) ;3=PTR TO NEXT ITEM ON QUEUE
HLRZ T2,(T1) ;2=PTR TO PREV ITEM
HRRM T3,(T2)
JUMPE T3,JTDEQ1 ;REMOVING LAST ITEM?
HRLM T2,(T3) ;NO
CAIA
JTDEQ1: MOVEM T2,JTLSTL ;MAKE HEADER POINT TO "PREVIOUS"
OKSKED
RET
SUBTTL Context switching for MUUO's
;Here from APRSRV when user or monitor executed an illegal UUO.
ILUUO:: MCENTR
ILUUO1::MOVEI T1,ILINS1
ITERR ;ILLEGAL UUO
;ALL UNDEFINED JSYS'S
UJSYS0::MCENT
UJSYS:: MOVEI T1,ILINS2
ITERR ;UNDEFINED JSYS
;Here when user executes a TOPS-10 UUO (op codes 40-77). Enter compatibility
;package
UU1050::SKIPE P1,@JTBLK ; JSYS traps?
JRST [ SETZ P2, ; Word 0
MOVSI P3,(1B0) ; Check for JSYS 0 (UUO trapping)
TDNN P3,JTBAL(P1)
JRST .+1 ; Not trapping UUOs
MOVE T1,FORKN ; Get fork number
MOVE T1,SYSFK(T1) ; Is this fork execute only?
TXNE T1,SFEXO ;...
JRST U10501 ;Yes, No trapping in this case
MOVE CX,[MSEC1B+TRAPSI] ; We are, go JSYS trap route
JRST MENTU1] ; Join JSYS code
U10501::SKIPL T1,PATADR ;Get the possible address of PAT
TRNN T1,777777 ;Do we have one now? (If yes, RH non-zero)
JRST GETPAT ;NO PAT CURRENTLY TRY TO GET ONE
SETPCS T1 ;SET PCS TO SECTION OF ENTRY VECTOR
TXNN T1,XS%EEV ;EXTENDED FORMAT VECTOR?
IFSKP.
MOVE T1,PATUPC ;YES, GET ITS ADDRESS
IFN KLFLG,<
MOVE T2,KIMUFL ;GET FLAGS WITH OP CODE, AC, AND PCS
> ;END OF IFN KLFLG
IFN KCFLG,<
MOVE T2,KIMUFL ;GET FLAGS WITH PAB, CAB, AND PCS
HRR T2,KIMOAC ;CREATE FLAGS WITH OP CODE AND AC AS ON KL
> ;END OF IFN KCFLG
MOVE T3,FPC ;GET PC WORD
XCTU [DMOVEM T2,0(T1)] ;PASS THEM TO PA1050
MOVE T1,PATU40 ;PTR TO UUO WORD
MOVE T2,KIMUEF ;MOVE UUO WORD TO PA1050
UMOVEM T2,0(T1)
ELSE.
MOVE T1,PATUPC ;NON-EXTENDED FORMAT, GET PTR TO PC
MOVE T2,FPC ;CONSTRUCT OLD STYLE FLAGS,,PC
HLL T2,FFL
UMOVEM T2,0(T1) ;PASS IT TO PA1050
MOVE T1,PATU40 ;PTR TO UUO WORD
MOVE T2,KIMUEF ;CONSTRUCT OLD STYLE UUO WORD
IFN KLFLG,<
HRL T2,KIMUFL ;GET OP CODE AND AC
> ;END OF IFN KLFLG
IFN KCFLG,<
HRL T2,KIMOAC ;GET OP CODE AND AC
> ;END OF IFN KCFLG
UMOVEM T2,0(T1)
ENDIF.
MOVE T1,PATADR ;SET PC TO ENTER PA1050
MOVEM T1,FPC
JRST GOUSR
;HERE ON DMS JSYS
DMSENT::SKIPG T1,DMSADR ;HAVE RMS NOW?
JRST GETDMS ;NO
SETPCS T1 ;SET PCS TO SECTION OF ENTRY VECTOR
TXNN T1,XS%EEV ;EXTENDED FORMAT VECTOR?
IFSKP.
MOVE T1,DMSUPC ;PTR TO PC
IFN KLFLG,<
MOVE T2,KIMUFL ;GET FLAGS WITH OP CODE, AC, AND PCS
> ;END OF IFN KLFLG
IFN KCFLG,<
MOVE T2,KIMUFL ;GET FLAGS WITH PAB, CAB, AND PCS
HRR T2,KIMOAC ;CREATE FLAGS WITH OP CODE AND AC AS ON KL
> ;END OF IFN KCFLG
MOVE T3,FPC ;GET PC WORD
XCTU [DMOVEM T2,0(T1)] ;PASS IT TO RMS
MOVE T1,DMSU40 ;PTR TO UUO WORD
MOVE T2,KIMUEF ;MOVE UUO WORD TO RMS
UMOVEM T2,0(T1)
ELSE.
MOVE T1,DMSUPC ;OLD FORMAT VECTOR, GET PTR TO PC
MOVE T2,FPC ;CONSTRUCT OLD STYLE FLAGS, PC
HLL T2,FFL
UMOVEM T2,0(T1) ;PASS IT TO RMS
MOVE T1,DMSU40 ;PTR TO UUO WORD
MOVE T2,KIMUEF ;CONSTRUCT OLD STYLE UUO WORD
IFN KLFLG,<
HRL T2,FFL ;GET OP CODE AND AC
> ;END OF IFN KLFLG
IFN KCFLG,<
HRL T2,KIMOAC ;GET OP CODE AND AC
> ;END OF IFN KCFLG
UMOVEM T2,0(T1)
ENDIF.
MOVE T1,DMSADR ;SET RETURN PC TO ENTER RMS
MOVEM T1,FPC
JRST GOUSR
;SLOW MONITOR CALL SETUP ROUTINE
;MENTM - Invoked via JRST from APRSRV with JSYS number in CX
;At this point,
;FFL, FPC - return flags and PC stored on MUUO.
MENTM:: LOAD CX,EXPCBT,JSTAB(CX) ;GET ROUTINE ADDRESS WITHOUT FLAGS
SETOM SLOWF
PUSH P,INTDF ;SAVE CONTEXT VARIABLES
PUSH P,MPP
PUSH P,FPC ;SAVE RETURN PC, FLAGS
PUSH P,FFL
MOVEM P,MPP ;SET NEW FRAME POINTER
XSFM FFL
MOVEM CX,FPC ;SETUP START PC FOR NEW JSYS
IFN SKEDSW,<
MOVE CX,-1(P) ;GET OLD PC
TXNN CX,EXSCBT ;CALLED FROM NON-0 SECTION?
BUG.(CHK,JSSEC0,SCHED,SOFT,<NESTED JSYS CALL FROM SECTION 0>,<<CX,PC>>,<
Cause: At entry to a JSYS called within the monitor, the return PC is
in section 0. This is a coding error which should be corrected.
This is under a debug conditional, so should never occur in
the field.
Data: 1. PC of offending JSYS.
>)
AOSGE INTDF ;CHECK STATE OF INTDF
BUG.(CHK,IDFOD1,SCHED,SOFT,<AT MENTR - INTDF OVERLY DECREMENTED>,<<CX,PC>>,<
Cause: At the time of a nested JSYS call, INTDF was less than -1. Some
code in the calling context must have fouled it up. This is
under a debug conditional and so should not appear in the field.
Data: 1. PC at which last JSYS was executed.
>)
SOS INTDF
> ;END OF IFN SKEDSW
;When running in the monitor, AC block 0 is current, 1 is previous
;Save the former "previous" AC block (block 1) in the PSB.
AOS P,ACBAS ;SETUP NEXT AC STACK BLOCK
CAIL P,<EUACB>B39 ;USED ALL BLOCKS?
BUG.(HLT,NOACB,SCHED,SOFT,<MENTR - NO MORE AC BLOCKS>,<<CX,PC>>,<
Cause: When a JSYS is executed from within the monitor, the
AC's of the current process are stored in a special area in the
monitor. This area consists of several 20-word blocks that are used
successively as one JSYS invokes another. The BUGHLT indicates that a
JSYS has been called but that no 20-word block is left in which to
store the contents of the AC's. This usually means that the counter
that the monitor uses to keep track of these blocks has been
clobbered.
Data: 1. PC at which last JSYS was executed.
>)
LSH P,4 ;MAKE INTO ADDRESS
;Copy the former "current" AC's (block 0) to the new "previous" AC's (block 1)
IFN KLFLG,<
SETPCS MSEC1A ;SET PCS SO PXCT [BLT] WORKS
MOVEI CX,0(P)
XCT 1,[BLT CX,17(P)] ;SAVE PREVIOUS CONTEXT AC'S
SETZ CX,
XCT 4,[BLT CX,CX-1] ;LOAD PREVIOUS CONTEXT AC'S 0-15 FROM CURRENT
> ;END OF IFN KLFLG
IFN KCFLG,<
STPAC. CX,(P) ;SAVE PREVIOUS CONTEXT AC'S
LDPAC <CX-1>,0 ;LOAD PREVIOUS CONTEXT AC'S 0-15 FROM CURRENT
> ;END OF IFN KCFLG
MOVE P,MPP ;RESTORE P
SETZM SLOWF
XCT MJRSTF ;RESUME MONITOR ROUTINE (NORMALLY XJRSTF FFL)
;Entry for MCENTR (JSP CX,MENT0). FFL and FPC have been setup by
;the caller, and may only be a user PC.
MENT0:: SETOM SLOWF
MOVE T1,FFL
TXNE T1,UMODF ;SIMULATING CALL FROM USER MODE?
IFSKP.
IFN SKEDSW,<
BUG.(HLT,MNTRNU,SCHED,SOFT,<MCENTR WITHOUT SETUP OF USER OLD PC>,<<CX,PC>>,<
Cause: MCENTR has been used without FFL having been setup to be a
user PC. This is a coding error.
Data: 1. PC at which MCENTR was executed.
>) >
MOVX T1,UMODF ;DUMMY UP ONE
MOVEM T1,FFL
ENDIF.
MOVE P,UPP ;YES
PUSH P,FPC
PUSH P,FFL
PUSH P,FPC
PUSH P,FFL
XSFM T1 ;COOK UP PROPER FLAGS
TXO T1,PCU ;PCU MUST BE ON
LOAD T2,VSECNO,FPC ;SECTION NUMBER OF RETURN PC
STOR T2,EXPCS,T1 ;PUT IT WHERE HARDWARE SEES IT
MOVEM T1,FFL ;USE THAT AS NEW FLAGS
JRST MENT2 ;JOIN NORMAL USER CASE, PC IN CX
;ENTRY TO TOP-LEVEL JSYS (I.E. FROM USER)
;Here when user executed a JSYS.
; CX/ JSYS number
MENTU:: SKIPE P1,@JTBLK ; Any JSYSes monitored for this fork?
JRST [ JUMPE CX,[ MCENTR ; Special case JSYS 0 (UUO trapping)
JRST UJSYS]
MOVE T1,FORKN ;Get fork number
MOVE T1,SYSFK(T1) ;Is this fork execute only?
TXNE T1,SFEXO ;...
JRST .+1 ;Yes, no trapping in this case
MOVE CX,JSTAB(CX) ;GET ROUTINE ADDRESS
LOAD P2,JTJNO ; Yes, get JSYS number
IDIVI P2,^D36 ; Get word offset into bit table
MOVE P3,BITS(P3) ; And bit mask
ADDI P1,0(P2) ; Form address within bit table
TDNE P3,JTBAL(P1) ; Trapped?
MOVE CX,[MSEC1,,TRAPSI] ;YES. HANDLE THIS SPECIALLY
JRST MENTU1]
MOVE CX,JSTAB(CX) ;GET ROUTINE ADDRESS
;Save on UPDL stack the flags and PC at the time of the MUUO
;Set up FFL and FPC to contain information for XJRSTF.
; CX/ PC to go to
MENTU1: MOVE P,UPP ;SET UP STACK
PUSH P,KIMUPC
PUSH P,KIMUFL ;RETURN FOR PSI
PUSH P,KIMUPC
PUSH P,KIMUFL
JSLKB1:: ;TAG FOR JSLOOK (SNOOP PGM)
XSFM FFL ;STORE PCS INTO FFL
;Common code for all JSYS entry from user
;Top of UPDL is set up. FFL and FPC are ready for XJRSTF.
MENT2: MOVEM CX,FPC ;SAVE NEW PC
MOVEM P,MPP ;SET STACK FENCE
XCTU [DMOVE T1,T1] ;GET STANDARD 4 ARGS
XCTU [DMOVE T3,T3]
MOVEI CX,<UACB>B39-1 ;INIT AC STACK
MOVEM CX,ACBAS ;CURRENT AC'S MAY BE STORED HERE
IFN SKEDSW,<
SKIPN NSKED ;IS THIS PROCESS NOSKED?
SKIPE CRSKED ;OR CSKED?
IFNSK.
SKIPN PNSKDC ;YES, SHOULD IT BE?
BUG.(HLT,MCLNSK,SCHED,SOFT,<PROCESS IS NOSKED OR CSKED AT JSYS ENTRY>,,<
Cause: At entry to a monitor call from user mode, process was found to
be NOSKED or CSKED. This should not be unless flag PNSKDC is set
indicating that a DIAG% has been done.
>)
ENDIF.
> ;END SKEDSW
SKIPN PNSKDC ;DIAG% NOSKED MEANS DON'T RESET INTDF
SETOM INTDF ;INIT INTDF
SETZM SLOWF ;INIT SLOWF
XCT MJRSTF ;RESUME MONITOR ROUTINE (NORMALLY XJRSTF FFL)
;New JSYS's go to ITRAP on error, MRETN on success
;Error returns from skipping JSYS's:
;MRETNE - invoked via RETERR. Stores error code from T1 in LSTERR and
; into user's AC 1 if no ERJMPS/ERCALS present
;EMRET0 - invoked via EMRETN. Stores error code into LSTERR
;EMRET1 - invoked via JRST. Assumes LSTERR already stored.
MRETNE::CALL TSTERJ ;ERCALS/ERJMPS PRESENT?
UMOVEM T1,1 ;NO, RETURN ERR CODE IN AC1
EMRET0::MOVEM T1,LSTERR ;SAVE ERROR CODE IN STANDARD PLACE
EMRET1::MOVE P,MPP ;RESTORE STACK PTR
DMOVE T1,-1(P) ;GET RETURN PC
EXCH T1,T2 ;IN PROPER ORDER
CALL ITRSIM ;ERJMP/ERCAL PRESENT?
JRST MRETN ;NO, NORMAL RETURN
MOVEM T3,-1(P) ;YES, SETUP RETURN
JRST MRETN
;SKMRTN IS STANDARD SKIP RETURN FROM JSYS
;Invoked via SMRETN
SKMRTN::MOVE P,MPP ;SET UP THE STACK POINTER
AOS -1(P) ;THEN INCREMENT THE RETURN ADDRESS
;..
;Standard return from JSYS. MPP is stack pointer at time of entry.
;Make FFL and FPC point to caller's return address
;..
MRETN:: SETOM SLOWF ;RESET FLAG
IFN SKEDSW,<
AOSGE INTDF ;CHECK STATE OF INTDF
BUG.(CHK,IDFOD2,SCHED,SOFT,<AT MRETN - INTDF OVERLY DECREMENTED>,,<
Cause: At MRETN, INTDF was found to be less than -1. This indicates
that this JSYS code did an unmatched OKINT and may have
allowed interrupts when it didn't intend to. This is
a coding error.
>) >
MOVE P,MPP ;GO BACK TO LAST STACK FENCE
POP P,CX ;RETURN FLAGS
TLNN CX,(UMODF) ;RETURN TO USER?
JRST MRETN1 ;NO
;JSYS was called from user context. Set up FFL and FPC from the stack
MOVEM CX,FFL ;SET UP FLAGS
JSLKB2:: ;TAG FOR JSLOOK (SNOOP PGM)
POP P,FPC ;RESTORE PC
IFN SKEDSW,<
SKIPN CRSKED
SKIPE NSKED ;FAILED TO MATCH NOSKED, CSKED?
IFNSK.
SKIPN PNSKDC ;DIAG% NOSKED?
BUG.(HLT,RTNNSK,SCHED,SOFT,<PROCESS IS NOSKED OR CSKED AT MRETN>,,<
Cause: Process is NOSKED or CSKED at return from monitor call. Probably
this JSYS went NOSKED or CSKED and forget to do the matching
OKSKED or ECSKED. This is a coding error.
>)
ENDIF.
SKIPGE FKLOCK ;FORK LOCK FREE?
IFSKP.
HRRZ CX,FORKN ;GET US
CAME CX,FLKOWN ;ARE WE THE OWNER?
ANSKP.
BUG.(CHK,INCFLK,SCHED,SOFT,<Fork lock set at return to user>,,<
Cause: Coding error has neglected to unlock the fork lock.
Action: The monitor unlocks the fork lock before returning
to the user. However, this BUGCHK may be indicative
of other failures to properly release resources
>) ;YES. COMPLAIN THEN
SETOM FKLOCK ;FREE IT
SETZM FLKCNT ;AND FREE THIS TOO
ENDIF.
> ;END IFN SKEDSW
;ALL TRANSFERS TO USER MODE COME HERE. THE SCHEDULER RECOGNIZES
;THE PC AT GOUSR+1 AS A SINGULARITY (USER AC BLOCK BUT MONITOR PC)
;AND CORRECTS FOR IT.
GOUSR::
IFN KLFLG,<
DATAO PAG,SETUSR ;SETUP USER AC BLOCK AS CURRENT
> ;END OF IFN KLFLG
XCT MJRSTF ;RETURN TO USER (NORMALLY XJRSTF FFL)
;Here if returning to monitor context. Check for returning from IMCALL.
MRETN1: POP P,FPC ;RESTORE PC
MOVEM CX,FFL ;STORE FLAGS
TXZE CX,IMCFLG ;INTERNAL CALL FLAG?
JRST IMCLL1 ;YES, DIFFERENT RETURN SEQUENCE
;Copy "previous" AC's to "current".
IFN KLFLG,<
SETPCS MSEC1A ;FUDGE PCS SO PXCT [BLT] WORKS
SETZ CX, ;MOVE PREV AC TO CURRENT
XCT 1,[BLT CX,CX-1] ;RESTORE CURRENT AC'S 0-15 FROM PREVIOUS
> ;END OF IFN KLFLG
IFN KCFLG,<
STPAC <CX-1>,0 ;RESTORE CURRENT AC'S 0-15 FROM PREVIOUS
> ;END OF IFN KCFLG
;Restore previous AC's from ACBAS block, stored at JSYS entry.
HRRZ CX,ACBAS ;POINT TO CURRENT LOCATION ON STACK
LSH CX,4
LDPAC. CX,0(CX) ;LOAD PREVIOUS CONTEXT AC'S FROM STACK
SOS CX,ACBAS ;DECREMENT ACBAS PTR
CAIGE CX,<UACB>B39-1
BUG.(HLT,OPOPAC,SCHED,HARD,<MRETN - TRIED TO OVER-POP AC STACK>,,<
Cause: When a JSYS is executed from within the monitor, the
AC's of the current process are stored in a special area in the
monitor. This area consists of several 20-word blocks that are used
successively as one JSYS calls another.
As each nested JSYS returns, the monitor's pointer to this area of
memory is decremented. The BUGHLT indicates that the pointer has
been decremented too far. This indicates either a clobbered pointer,
or an attempt to return from a JSYS without having entered one.
>)
;Restore variables stored on UPDL stack at JSYS entry.
POP P,MPP ;RESTORE VARIABLES
POP P,INTDF
SETZM SLOWF
XCT MJRSTF ;RETURN TO CALLER (NORMALLY XJRSTF FFL)
;INTERNAL MONITOR CALL LOGIC
; JSP CX,IMCLL0
; ADDRESS
;THIS EFFECTS A CALL TO 'ADDRESS' (PRESUMABLY A JSYS ENTRY POINT)
;JUST AS THOUGH A JSYS HAD BEEN DONE BUT WITHOUT CHANGING THE
;PREVIOUS CONTEXT. THUS PREVIOUS CONTEXT REFERENCES IN THE CALLEE
;WILL NOT REFERENCE THE CURRENT CONTEXT OF THE CALLER BUT RATHER
;THE PREVIOUS CONTEXT OF THE CALLER. USED WHERE ARGUMENTS
;(E.G. BLOCK POINTERS, STRINGS) MUST BE PASSED TO LOWER LEVEL
;ROUTINES. NOTE THAT ALL ACS ARE AUTOMATICALLY SAVED AND RESTORED,
;THE THE AC CONTEXT IS NOT CHANGED, SO ARGUMENTS MUST GENERALLY
;BE SETUP IN THE PREVIOUS CONTEXT ACS.
IMCLL0::SETOM SLOWF ;INHIBIT PSI
XSFM FFL ;SAVE FLAGS
TXZ CX,EXFLBT ;MASK OFF FLAGS FROM JSP (IF CALLED FROM SEC 0)
MOVEM CX,FPC ;SAVE RETURN
ADD P,[CX,,CX] ;ALLOCATE STACK SPACE FOR ACS
MOVEI CX,-CX+1(P) ;MOVE ACS TO STACK
BLT CX,0(P)
PUSH P,INTDF ;ESTABLISH USUAL STACK CONTEXT
PUSH P,MPP
AOS FPC ;BUMP RETURN PAST CALL ADDRESS WORD
PUSH P,FPC ;SAVE RETURN PC
MOVE CX,FFL ;PICK UP FLAGS
TXO CX,IMCFLG ;FLAG INTERNAL CALL
PUSH P,CX ;SAVE RETURN FLAGS
MOVE CX,FPC ;RESTORE PC
MOVE CX,-1(CX) ;GET CALL ADDRESS
TXC CX,<JSYS> ;SEE IF A JSYS
TXCE CX,<JSYS> ;IS IT?
IFSKP.
TLNE CX,<-<JSYS+1>>B53 ;MAYBE. STILL?
ANSKP.
HRRZS CX ;YES. GET INDEX
MOVE CX,JSTAB(CX) ;GET DISPATCH ADDRESS
ENDIF.
MOVEM CX,FPC ;SET UP TRANSFER TO PROPER SECTION,,OFFSET
MOVEM P,MPP ;SAVE STACK FENCE
XCTU [DMOVE T1,T1] ;GET STANDARD 4 ARGS
XCTU [DMOVE T3,T3]
SETZM SLOWF ;ENABLE PSI
XCT MJRSTF ;JUMP TO CALL ADDRESS
;HERE WHEN INTERNAL CALL FLAG DETECTED IN RETURN FLAGS WORD
IMCLL1: POP P,MPP ;RESTORE CONTEXT VARIABLES
POP P,INTDF
MOVSI CX,-CX+1(P) ;RESTORE ACS
BLT CX,CX-1
SUB P,[CX,,CX] ;DEALLOCATE STACK SPACE
XCTU [DMOVE T1,T1] ;SETUP RETURN VALUES
XCTU [DMOVE T3,T3]
SETZM SLOWF ;ENABLE PSI
XCT MJRSTF ;RETURN
;CHECK FOR PRESENCE OF SPECIAL INSTRUCTIONS FOLLOWING JSYS WHICH
;FAILED.
;COMMON ROUTINE TO CHECK FOR ERJMP/ERCAL AND DO
;CORRECT SIMULATION.
; T1,T2/ FLAGS AND PC
;
; RETURNS +1 IF NONE FOUND OR PDL OV ON ERCAL
; RETURNS +2 WITH RETURN ADDRS IN C(T3)
;NOTE: ALL REFERENCES TO PREVIOUS CONTEXT SHOULD BE PROTECTED WITH
;ERJMPS IN CASE USER HAS BAD PROTECTIONS, NONX SECTIONS, ETC.
ITRSIM::TXNN T1,UMODF ;CALL FROM MONITOR?
SKIPA T3,0(T2) ;YES, FETCH FROM CURRENT CONTEXT
UMOVE T3,0(T2) ;NO, FETCH FROM PREVIOUS CONTEXT
ERJMP R ;RETURN IF REF FAILS
LDB T4,[POINT 13,T3,12] ;GET OPCODE AND AC
CAIE T4,<ERJMPS>B58
CAIN T4,<ERJMP>B58 ;AN ERJMP?
JRST ITRSX ;YES
CAIE T4,<ERJMPR>B58 ;AN ERJMPR?
IFSKP.
MOVE T4,LSTERR ;YES, MAKE SURE ERRCOD RETURNED IN AC1
UMOVEM T4,1
JRST ITRSX
ENDIF.
CAIE T4,<ERCAL>B58 ;AN ERCAL?
CAIN T4,<ERCALS>B58
IFSKP.
CAIE T4,<ERCALR>B58 ;NO, AN ERCALR?
RET ;NOTA, RETURN
MOVE T4,LSTERR ;RETURN ERRCOD IN AC1 ALWAYS
UMOVEM T4,1
ENDIF.
;Found an ERCAL. Fix up user's stack to simulate a call.
HRRI T2,1(T2) ;YES, GET INCREMENTED PC
UMOVE T4,P ;LOOK AT STACK PTR
TXNE T2,VSECNO ;PC IN SECTION 0?
JUMPGE T4,[MOVEI T4,1 ;NO, DIFFERENT RULES
XCTU [ADDB T4,P] ;BUMP PTR, NO OV CHECK
JRST ITRSY] ;GO FINISH UP JUMP
MOVE T4,[1,,1]
XCTU [ADDB T4,P] ;BUMP PTR
TLNN T4,377777 ;PDL OVERFLOW?
CALL [SAVET ;YES
MOVE T1,BITS+.ICPOV ;CHANNEL 9 INTERRUPT
CALL IICSLF
RET]
TXNN T2,VSECNO ;IF NOT EXT ADR,
HLL T2,T1 ;INCLUDE FLAGS WITH PC
ITRSY: UMOVEM T2,0(T4) ;STORE PC FROM JSYS
ERJMP [SAVET
MOVE T1,BITS+.ICIWR ;ILLEGAL MEMORY WRITE
CALL IICSLF ;GIVE INTERRUPT
RET] ;AND RETURN
;Get 30-bit address to go to, and return it to caller.
ITRSX: TLZ T3,777740 ;GET RID OF INSTRUCTION PART
TXO T3,<XMOVEI T3,0> ;FORM INST FETCH
TXNN T1,IMCFLG ;MONITOR AND INTERNAL CALL?
IFSKP.
TXNN T3,<Z 0(17)> ;INDEXING?
IFSKP.
XCT T3 ;YES, DO THE XMOVEI
ELSE.
TXNN T3,<Z @0> ;INDIRECTION?
IFSKP.
HLL T3,T2 ;YES, SIMULATE ONE LEVEL...
MOVE T3,0(T3) ;PICK UP INDIRECT WORD FROM LOCAL SECTION
ELSE.
HLL T3,T2 ;NO, PLUG IN SECTION FROM RETURN PC
ENDIF.
ENDIF.
RETSKP ;DONE
ENDIF.
XCTUU T3 ;GET PREV CONTEXT ADDRESS
ERJMP R ;GIVE UP IF E CALC FAILS
RETSKP ;GIVE GOOD RETURN
;TSTERJ - Test for putting error code into specific AC.
; CALL TSTERJ
; RETURN +1: Error code should be stored.
; +2: ERJMPR/ERCALR/ERJMPS/ERCALS present, don't store.
; ALL ACS PRESERVED
TSTERJ::SAVET
MOVE T4,MPP ;GET LAST STACK FENCE
DMOVE T1,-1(T4) ;GET PC DOUBLEWORD
EXCH T1,T2 ;IN PROPER ORDER
TXNE T1,IMCFLG ;INTERNAL CALL?
SKIPA T1,0(T2) ;YES, FETCH FROM CURRENT CONTEXT
UMOVE T1,0(T2) ;NO, FETCH FROM PREVIOUS CONTEXT
LDB T1,[POINT 13,T1,12] ;GET OP AND AC FIELDS
CAIE T1,<ERJMPR>B58
CAIN T1,<ERCALR>B58 ;THE R FLAVOR?
RETSKP ;YES, CODE STORED BY ITRSIM ONLY.
CAIE T1,<ERJMPS>B58 ;IS IT AN ERJMPS?
CAIN T1,<ERCALS>B58 ; OR AN ERCALS?
RETSKP ;YES, NO CODE IN AC
RET ;NO
;SET PREVIOUS CONTEXT VARIABLES
;CALLED WHEN CHANGING CONTEXT IN SOME UNUSUAL WAY, E.G. POPPING UPDL
; T1/ FLAGS
; T2/ PC
; CALL SETPCV
; RETURN +1 ALWAYS, ARGS PRESERVED
SETPCV::XSFM T3 ;GET CURRENT FLAGS
TXZ T3,PCU ;CLEAR VARIABLES
TXNE T1,UMODF ;PREVIOUS CONTEXT WAS USER?
TXO T3,PCU ;YES
LOAD T4,VSECNO,T2 ;GET PREVIOUS PC SECTION
STOR T4,EXPCS,T3
POP P,T4 ;GET LOCAL RETURN
ANDX T4,EXPCBT ;BUT ONLY THE GOOD BITS
XJRSTF T3 ;RETURN AND SET PREV CONTEXT VARIABLES
;ROUTINE TO CHECK IF THERE IS AN ERJMP OR AN ERCAL AFTER A JSYS
;ACCEPTS IN T1/ RETURN FLAGS
; T2/ RETURN PC
; CALL CHKERT
;RETURNS +1: NO ERJMP OR ERCAL
; +2: THERE IS AN ERJMP OR AN ERCAL
;Finds S flavor too.
CHKERT::TXNE T1,IMCFLG ;INTERNAL CALL?
SKIPA T1,0(T2) ;YES, FETCH FROM CURRENT CONTEXT
UMOVE T1,0(T2) ;NO, FETCH FROM PREVIOUS CONTEXT
LDB T1,[POINT 13,T1,12] ;GET OP AND AC FIELDS
CAIE T1,<ERJMPR>B58 ;R FLAVOR?
CAIN T1,<ERCALR>B58
RETSKP ;YES
CAIE T1,<ERJMPS>B58 ;S FLAVOR?
CAIN T1,<ERCALS>B58
RETSKP ;YES
CAIE T1,<ERJMP>B58 ;IS IT AN ERJMP?
CAIN T1,<ERCAL>B58 ; OR AN ERCAL?
RETSKP ;YES
RET ;NO
UPP:: IOWD NUPDL,UPDL ;MONITOR BASE STACK POINTER
UPP1: XWD -NUPDL+3,UPDL-1+3 ;STK PTR AT ENTRY TO TOP LEVEL JSYS
;CKMMOD - CHECK FOR MONITOR MODE
CALL CKMMOD
;RETURNS +1: CALLER CAME FROM USER CONTEXT
; +2: CALLER CAME FROM MONITOR CONTEXT
;CLOBBERS NO AC'S
;THIS ROUTINE IS CALLED BY A JSYS (TTMSG, FOR EXAMPLE), WHEN IT
;REQUIRES THE CALLER TO BE PRIVILEGED EXCEPT WHEN THE CALLER IS IN
;MONITOR CONTEXT. THIS ALLOWS A NON-PRIVILEGED JSYS LIKE DTACH
;TO DO A PRIVILEGED FUNCTION LIKE TTMSG
CKMMOD::ACVAR <W1> ;GET A WORK AC
MOVE W1,MPP ;GET STACK POINTER ON ENTRY TO THE JSYS
MOVE W1,0(W1) ;GET THE FLAGS WORD FROM THE STACK
TLNE W1,(UMODF) ;IS IT USER MODE?
RET ;YES. TAKE NONSKIP RETURN
RETSKP ;NO. TAKE SKIP RETURN
ENDAV. ;END ACVAR
SUBTTL SKED JSYS
;JSYS TO DO SCHEDULER CONTROLS
;JSYS TO READ/SET SCHEDULER PARAMETERS.
SWAPCD ;START UP IS SWAPPABLE
.SKED:: MCENT ;GET INTO MONITOR
SKIPLE T1 ;VALIDATE FUNCTION
CAILE T1,MAXFUN ;VALID FUNCTION
ITERR (ARGX02) ;INVALID
SKIPL FNCTBL-1(T1) ;PRIVILEGED FUNCTION?
JRST SKED1 ;NO
MOVX T4,SC%WHL!SC%OPR ;MUST BE PRIVILEGED
TDNN T4,CAPENB ;IS IT?
ITERR (CAPX1) ;NO. BOMB THEN
SKED1: HRRZ T1,FNCTBL-1(T1) ;GET DISPATCH
JRST 0(T1) ;DO FUNCTION
FNCTBL: SKDRNB ;READ KNOB
IFIW!SKDSNB ;SET KNOB
SKDRCS ;READ CLASS SHARES
IFIW!SKDSCS ;SET CLASS SHARE
IFIW!SKDSCL ;START CLASS SCHEDULING
SKDSJC ;SET JOB CLASS
SKDRTJ ;READ THIS JOB'S UTILIZATION AND SHARE
SKDRCB ;READ CLASS SETTING FOR BATCH JOBS
IFIW!SKDSCB ;SET BATCH CLASS
IFIW!SKDRDQ ;RUN BATCH JOBS ON DREGS QUEUE
IFIW![ITERR (ARGX02)] ;UNUSED SLOT
SKDRCP ;READ CLASS PARAMETERS
MAXFUN==.-FNCTBL
;ACTION ROUTINES FOR EACH FUNCTION
;READ MICRO-CONTROL KNOB
SKDRNB: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,1 ;ROOM TO STORE VALUE?
ITERR (ARGX04) ;NO. ERROR THEN
LOAD T1,CLSKV ;GET KNOB VALUE
UMOVEM T1,.SAKNB(T2) ;RETURN TO USER
MRETNG ;AND DONE
;SET MICRO-CONTROL VALUE
SKDSNB: UMOVE T3,.SACNT(T2) ;GET COUNT
CAIG T3,1 ;HAVE VALUE TO SET?
ITERR (ARGX04) ;NO.
UMOVE T2,.SAKNB(T2) ;YES. GET IT
SKIPLE T2
CAILE T2,NSKFLV ;VALID SETTING?
ITERR (ARGX30) ;INVALID KNOB
STOR T2,CLSKV ;STORE KNOB VALUE
MOVE T2,SKFLGV-1(T2) ;GET NEW FLAGS
MOVEM T2,SCHFLG ;NEW FLAGS
MRETNG ;AND DONE
;READ CLASS SHARE
SKDRCS: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,2 ;ROOM FOR DATA?
ITERR (ARGX04) ;NO
SUBI T3,2 ;REMOVE HEADER
MOVNS T3
HRLZS T3 ;GET VALUE TO LH
HRRI T3,2(T2) ;START OF DATA
UMOVE P1,1(T2) ;GET CLASS I.D.
SKIPL P1 ;GOOD CLASS?
CAIL P1,MAXCLS ;STILL?
ITERR (ARGX25) ;NO
MOVE T4,@[EP. CLSSHR(P1)] ;GET CLASS' SHARE
UMOVEM T4,0(T3) ;RETURN TO CALLER
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. CLSUTL(P1)] ;YES. GET UTILIZATION
UMOVEM T4,0(T3) ;RETURN TO CALLER
AOBJP T3,SKDONE ;WANT MORE?
IMULI P1,3 ;LOAD AVERAGES *3
MOVE T4,@[EP. CLSRJA(P1)] ;GET FIRST AVERAGE
UMOVEM T4,0(T3) ;STORE IT
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. CLSRJA+1(P1)] ;GET SECOND AVERAGE
UMOVEM T4,0(T3) ;STORE IT
AOBJP T3,SKDONE ;LAST ONE TOO?
MOVE T4,@[EP. CLSRJA+2(P1)] ;GET THIRD AVERAGE
UMOVEM T4,0(T3) ;STORE THIRD AVERAGE
JRST SKDON0 ;AND DONE
;READ THIS JOB'S UTILIZATION AND SHARE
SKDRTJ: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,2 ;ROOM FOR ANY DATA?
ITERR (ARGX04) ;NO
SUBI T3,2 ;YES. GET NUMBER OF WORDS WANTED
MOVNS T3 ;MAKE IT NEG
HRLZS T3 ;GET IT IN THE LH
HRRI T3,.SAJCL(T2) ;FORM AOBJP POINTER
UMOVE T1,1(T2) ;GET JOB NUMBER
CAME T1,[-1] ;THIS JOB?
IFSKP. ;IF SKIP, T1 IS -1, SO GET OUR OWN JOB INDEX
MOVE T1,JOBNO ;FROM THE LOCAL JOB NUMBER
ELSE. ;IF NO SKIP, T1 IS A GLOBAL JOB NUMBER, SO
CALL GL2LCL ;ASK CFS TO CONVERT IT TO A LOCAL
ITERR(ARGX08) ;AND COMPLAIN IF THE JOB NUMBER WAS ILLEGAL
ENDIF. ;NOW CONTINUE WITH THE LOCAL JOB INDEX IN T1
SKIPGE JOBRT(T1) ;LOGGED IN?
ITERR (ARGX15) ;NO
HRRZ P1,@[EP. JOBCLS(T1)] ;GET CLASS OF JOB
UMOVEM P1,0(T3) ;RETURN CLASS NUMBER
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. CLSSHI(P1)] ;YES. GET JOB'S SHARE
UMOVEM T4,0(T3) ;AND RETURN TO USER
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. JOBUTL(T1)] ;YES. GET UTILIZATION
UMOVEM T4,0(T3) ;AND RETURN IT TO THE USER
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. CLSSHR(P1)] ;YES. GET CLASS SHARE
UMOVEM T4,0(T3) ;AND RETURN TO USER
AOBJP T3,SKDONE ;WANT MORE?
MOVE T4,@[EP. CLSUTL(P1)] ;YES. GET CLASS UTILIZATION
UMOVEM T4,0(T3) ;AND RETURN TO USER
SKDON0: ADD T3,BHC+1 ;ACCOUNT FOR LAST ONE
SKDONE: HLRES T3 ;GET REMAINING COUNT
XCTU [HRRZ T4,0(T2)] ;GET ORIGINAL COUNT
ADD T3,T4 ;COMPUTE WORDS PROCESSED
XCTU [HRLM T3,0(T2)] ;AND RETURN THIS AS WELL
MRETNG ;AND DONE
;SET CLASS SHARE FOR CLASS N
RESCD ;MUST BE RESIDENT TO AVOID PAGE FAULTS
SKDSCS: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,.SACLS+1 ;ENOUGH ARGS GIVEN?
ITERR (ARGX04)
SETOM P2 ;ASSUME CLSSWA SETTING IN ON
CAILE T3,.SAWA ;SPECIFIED SWITCH SETTING?
UMOVE P2,.SAWA(T2) ;YES. GET IT
SKIPE P2 ;ON?
SETOM P2 ;YES. SWITCH IT THEN
XCTU [DMOVE T1,.SACLS(T2)] ;GET ARGS
SKIPL T1
CAILE T1,MAXCLS-1 ;VALID CLASS?
ITERR (ARGX25)
NOSKED ;OWN MACHINE FOR A WHILE
PUSH P,@[EP. CLSSHR(T1)] ;SAVE OLD CLASS VALUE
MOVEM T2,@[EP. CLSSHR(T1)] ;SET NEW CLASS
SETZM P1 ;GET ACCUMULATOR
MOVEI T3,MAXCLS-1
SKDSC1: FAD P1,@[EP. CLSSHR(T3)] ;GET TOTAL SHARES ALLOCATED
SOJGE T3,SKDSC1
POP P,@[EP. CLSSHR(T1)] ;PUT BACK OLD VALUE
JUMPE T2,SKDS11 ;ALLOW 0 ALWAYS
CAML T2,[SHRMIN] ;AT LEAST THE MINIMUM?
CAMLE P1,[1.0] ;VALID NUMBER?
ITERR (ARGX29,<OKSKED>) ;NO
SKDS11: MOVEM P2,@[EP. CLSSWA(T1)] ;SET CLSSWA VECTOR VALUE
EXCH T1,T2 ;ORDER ARGS
CALL CRTSHR ;MAKE SHARE
OKSKED ;RESTORE MACHINE
MRETNG ;AND DONE
;SET CLASS FOR JOB
SKDSJC: TMNN CLSAC ;DOING CLASS BY ACCOUNT?
SKIPN CLASSF ;NO. ACCOUNTING OFF?
ITERR (SKDX1) ;YES. CAN'T DO THIS THEN
XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIGE T3,3 ;ENOUGH ROOM?
ITERR (ARGX04) ;NO
XCTU [DMOVE T1,.SAJOB(T2)] ;GET DATA
CAME T1,[-1] ;THIS JOB?
IFSKP. ;SKIP MEANS OUR OWN JOB
MOVE T4,GBLJNO ;Save Global job number for GETOK%
MOVE T1,JOBNO ;GET OUR LOCAL JOB INDEX
ELSE. ;NO SKIP, MEANS A GLOBAL JOB NUMBER IS THERE
MOVE T4,T1 ;Save global job number for GETOK%
CALL GL2LCL ;SO CONVERT IT TO A LOCAL INDEX
ITERR(ARGX08) ;AND COMPLAIN IF THAT GLOBAL WAS NO GOOD.
ENDIF. ;
CAMN T2,JOBNO ;DID WE END UP WITH OURSELF?
IFSKP. ;SKIP MEANS IT'S SOMEONE ELSE'S JOB NUMBER
MOVX T3,SC%WHL!SC%OPR ;SO CHECK FOR THESE PRIV'S
TDNN T3,CAPENB ;FOR WHEEL/OPR
ITERR(CAPX1) ;NOT GOOD ENOUGH
ENDIF. ;JUST FINE.
SKIPGE JOBRT(T1) ;LOGGED IN?
ITERR (ARGX15) ;NO
SKIPL T2 ;TRYING TO SET A VALID CLASS?
CAIL T2,MAXCLS ;HMMMMM?
ITERR (ARGX25) ;ITRAP TO USER, THE LOSER
; MOVX T3,SC%WHL ;SEE IF THIS JOB IS WHEELED
; TDNE T3,CAPENB ;IS IT?
; JRST SKDSJ1 ;YES. SKIP GETOK THEN
GTOKM (.GOCLS,<T4,T2>) ;VERIFY REQUEST. ITRAP IF DENIED
SKDSJ1: EXCH T1,T2 ;ARRANGE ARGS PROPERLY
NOSKED
CALL CHGCLS ;DO CHANGE
OKSKED
MRETNG ;AND DONE
;START UP THE CLASS SCHEDULER
SKDSCL: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,1 ;ENOUGH WORDS?
ITERR (ARGX04) ;NO
NOSKED
UMOVE P1,.SACTL(T2) ;GET CONTROL WORD
TXNE P1,SK%STP ;STOP?
JRST [ SETZM CLASSF ;YES
CALL QBIAS ;SET UP QUANTS PROPERLY
JRST SKDSC0] ;DONE
SKIPE CLASSF ;NO. IS IT NOW ON?
ITERR (ARGX31,<OKSKED>) ;YES. CAN'T DO IT THEN
CALL QCLASS ;SET UP CLASS QUANTS
CALL STRCLS ;START UP CLASS SCHEDULER
MOVEI T1,0
TXNE P1,SK%ACT ;WANT CLASS BY ACCOUNTS?
MOVEI T1,1 ;YES.
STOR T1,CLSAC ;STORE VALUE
MOVEI T1,1
TXNE P1,SK%WDF ;WITHHOLD WINDFALL?
MOVEM T1,CLASSF ;YES. STATE THIS THEN
SKDSC0: OKSKED ;RESTORE MACHINE
MRETNG ;AND DONE
;FUNCTIONS TO SET/READ DEFAULT INFORMATION
;READ CLASS SETTING FOR BATCH JOBS
SWAPCD ;BACK TO SWAPPABLE CODE
SKDRCB: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,1 ;ROOM TO STORE VALUE?
ITERR (ARGX04) ;NO. CAN'T DO IT THEN
LOAD T1,CLSBT ;GET BATCH CLASS
SUBI T1,1 ;ONE LESS
UMOVEM T1,.SABCL(T2) ;RETURN GOOD DATA
MRETNG ;AND DONE
;SET BATCH CLASS
SKDSCB: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,1 ;HAVE AN ARG?
ITERR (ARGX04) ;NO
UMOVE T1,.SABCL(T2) ;GET SETTING
AOSL T1 ;VALID?
CAILE T1,MAXCLS+1 ;STILL?
ITERR (ARGX25) ;NO
STOR T1,CLSBT ;SAVE IT
MRETNG ;AND DONE
;RUN ALL BATCH JOBS ON DREGS QUEUE
SKDRDQ: STKVAR <OPRIOR,NPRIOR,JOBN,TTYN>
XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
SKIPE T2 ;HAVE A COUNT?
CAIG T3,1 ;BIG ENOUGH?
TROA T1,1 ;NO. SET IT THEN
UMOVE T1,.SADRG(T2) ;YES. GET IT
SKIPE T1 ;SET OR CLEAR?
MOVEI T1,1 ;SET
STOR T1,CLSBD ;DO IT
SETZ T4, ;CLEAR DREGS STATE FIRST
SKIPE T1 ;ARE WE SETTING OR CLEARING THE STATE
MOVX T4,DREGS ;SETTING, GET PRIORITY WORD
MOVEM T4,NPRIOR ;AND SAVE NEW PRIORITY
MOVSI T4,-NTTPTY ;GET AOBJN POINTER OVER PTYSTS TABLE
SKDDQ1: MOVEI T2,0(T4) ;GET PTY NUMBER
CALL PTYTTY ;CONVERT TO TERMINAL NUMBER
MOVEM T2,TTYN ;SAVE TERMINAL NUMBER
MOVE T1,TTYN ;GET TTY NUMBER IN AC1
CALL CHKBCH ;IS THIS JOB A BATCH JOB?
JRST SKDDQ2 ;NO, IGNORE IT
MOVE T2,TTYN ;GET BACK TERMINAL NUMBER
CALL GTCJOB ;GET CONTROLLING JOB NUMBER
JRST SKDDQ2 ;TERMINAL NOT ACTIVE, SHOULD NOT HAPPEN
MOVEM T3,JOBN ;SAVE JOB NUMBER
MOVE T1,JOBN ;GET JOB NUMBER INTO AC1
CALL MAPJSB ;MAP IN THE JOBS JSB
JRST SKDDQ2 ;NO JOB? FORGET IT
MOVE T2,JOBSKD(T1) ;GET OLD PRIORITY WORD.
MOVEM T2,OPRIOR ;SAVE OLD PRIORITY WORD
CALL CLRJSB ;NOW CLEAR THE MAPPING OF THE JSB
SKIPE T2,OPRIOR ;WAS A PRIORITY SET?
CAIN T2,DREGS ;EITHER 0 OR DREGS?
SKIPA ;YES, OKAY TO CHANGE
JRST SKDDQ2 ;NO, CHANGED PRIORITY, SKIP IT
MOVE T1,JOBN ;GET BACK JOB NUMBER
CALL LCL2GL ;Convert local job index to global job number
JRST SKDDQ2 ; No such job, this shouldn't happen.
MOVE T2,NPRIOR ;AND GET NEW PRIORITY WORD
SJPRI ;SET IT
ERJMP SKDDQ2 ;SHOULD NOT GENERATE AN ERROR
SKDDQ2: AOBJN T4,SKDDQ1 ;LOOP OVER ALL PTYS
MRETNG ;AND DONE
;READ CLASS PARAMETERS
SKDRCP: XCTU [HRRZ T3,.SACNT(T2)] ;GET COUNT
CAIG T3,1 ;ROOM FOR DATA?
ITERR (ARGX04) ;NO
SKIPN CLASSF ;CLASS SCHEDULER ON?
JRST [ MOVX T1,SK%STP ;NO. SAY STOPPED
JRST SKDRC0] ;AND FINISH UP
SETZM T1 ;INIT VALUE
TMNE CLSAC ;DOING ACCOUNTS?
TXO T1,SK%ACT ;YES
SKIPL CLASSF ;WINDFALL WITHHELD?
TXO T1,SK%WDF ;YES.
SKDRC0: LOAD T3,CLSBD ;SEE IF BATCH ON DREGS
STOR T3,SK%DRG,T1 ;0 IF SO, 1 IF NOT
UMOVEM T1,.SACTL(T2) ;RETURN DATA
MRETNG ;AND DONE
TNXEND
END