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tops20_version7_0_monitor_sources_clock
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monitor-sources/magtap.mac
There are 58 other files named magtap.mac in the archive. Click here to see a list.
; UPD ID= 8550, RIP:<7.MONITOR>MAGTAP.MAC.2, 11-Feb-88 11:02:34 by GSCOTT
;TCO 7.1218 - Update copyright date.
; UPD ID= 2119, SNARK:<6.1.MONITOR>MAGTAP.MAC.20, 5-Jun-85 09:54:20 by MCCOLLUM
;TCO 6.1.1406 - Update copyright notice.
; UPD ID= 1988, SNARK:<6.1.MONITOR>MAGTAP.MAC.19, 17-May-85 15:57:03 by MCCOLLUM
;TCO 6.1.1238 - Fix more BUG. documentation
; UPD ID= 1889, SNARK:<6.1.MONITOR>MAGTAP.MAC.18, 4-May-85 14:53:19 by MCCOLLUM
;TCO 6.1.1238 - Fix more BUG. documentation
; UPD ID= 1790, SNARK:<6.1.MONITOR>MAGTAP.MAC.17, 23-Apr-85 12:58:06 by MCCOLLUM
;TCO 6.1.1238 - Fix more BUG. documentation
; UPD ID= 1735, SNARK:<6.1.MONITOR>MAGTAP.MAC.16, 9-Apr-85 10:29:01 by MCCOLLUM
;TCO 6.1.1238 - Fix BUG. documentation
; UPD ID= 4856, SNARK:<6.MONITOR>MAGTAP.MAC.15, 20-Sep-84 09:12:19 by GLINDELL
;TCO 6.2209 - Allow MTOPR% .MOIEL for non-open JFN's
; UPD ID= 4531, SNARK:<6.MONITOR>MAGTAP.MAC.14, 14-Jul-84 09:48:08 by PURRETTA
;Update copyright notice
; UPD ID= 4245, SNARK:<6.MONITOR>MAGTAP.MAC.13, 25-May-84 12:14:17 by SHTIL
; UPD ID= 3986, SNARK:<6.MONITOR>MAGTAP.MAC.12, 27-Mar-84 15:45:02 by MOSER
;MORE 6.1984 - OFF BY ONE BUG
; UPD ID= 3984, SNARK:<6.MONITOR>MAGTAP.MAC.11, 27-Mar-84 13:50:12 by MOSER
;MORE 6.1984 - SIMPLIFY CODE
; UPD ID= 3879, SNARK:<6.MONITOR>MAGTAP.MAC.10, 7-Mar-84 21:37:48 by MOSER
;TCO 6.1984 - ADD .MOIRB MTOPR
; UPD ID= 3719, SNARK:<6.MONITOR>MAGTAP.MAC.9, 21-Feb-84 13:29:46 by MCCOLLUM
;TCO 6.1972 - Make MTALN% return MTNX01 error if sreial number not found
; UPD ID= 2782, SNARK:<6.MONITOR>MAGTAP.MAC.8, 1-Aug-83 10:34:13 by HAUDEL
;TCO 6.1744 - Add to the .MOINF function of the MTOPR jsys
; UPD ID= 2450, SNARK:<6.MONITOR>MAGTAP.MAC.7, 10-May-83 07:54:51 by HAUDEL
;More TCO 6.1631 - add brackets for calculation
; UPD ID= 2415, SNARK:<6.MONITOR>MAGTAP.MAC.6, 4-May-83 07:41:31 by HAUDEL
;TCO 6.1631 - Allow record sizes of 16. pages for DUMPO/DUMPI
; UPD ID= 2101, SNARK:<6.MONITOR>MAGTAP.MAC.5, 28-Mar-83 17:42:23 by MURPHY
;TCO 6.1472 - Minor cleanup re. LSTERR.
; UPD ID= 1062, SNARK:<6.MONITOR>MAGTAP.MAC.4, 9-Aug-82 15:53:20 by PAETZOLD
;TCO 6.1219 - Extend MTADTB for RLJFD
; UPD ID= 898, SNARK:<6.MONITOR>MAGTAP.MAC.3, 9-Jun-82 23:13:18 by MURPHY
;TCO 6.1147 - Move bugdefs from BUGS.MAC to here and put them in-line.
;<6.MONITOR>MAGTAP.MAC.2, 16-Oct-81 18:06:33, EDIT BY MURPHY
;TCO 6.1030 - Node names in filespecs; etc.
;Revise DTB format; get rid of double skips on NLUKD, etc.
; UPD ID= 2072, SNARK:<5.MONITOR>MAGTAP.MAC.8, 24-May-81 17:10:10 by ZIMA
;TCO 5.1347 - set ERRF on EOT for dump mode output so volume switch occurs.
; UPD ID= 2011, SNARK:<5.MONITOR>MAGTAP.MAC.7, 16-May-81 12:11:16 by DONAHUE
;TCO 5.1326 - set CST0's modify bit after locking the buffer pages (uncomment
;the old code at MTDIR1)
; UPD ID= 1822, SNARK:<5.MONITOR>MAGTAP.MAC.6, 17-Apr-81 09:51:33 by WACHS
;TCO 5.1288 log statistics on an unload
; UPD ID= 1811, SNARK:<5.MONITOR>MAGTAP.MAC.5, 16-Apr-81 12:08:36 by SCHMITT
;TCO 5.1283 - Make MTAKIL external for call from TAPE
; UPD ID= 1809, SNARK:<5.MONITOR>MAGTAP.MAC.4, 15-Apr-81 16:12:30 by SCHMITT
;TCO 5.1284 - Fix MTANOQ BUGCHKs (change edit TCO 5.1054)
; UPD ID= 786, SNARK:<5.MONITOR>MAGTAP.MAC.3, 23-Jul-80 13:40:58 by ZIMA
;TCO 5.1110 - Fix values returned by .MOINF function of MTOPR.
; UPD ID= 581, SNARK:<5.MONITOR>MAGTAP.MAC.2, 1-Jun-80 17:42:09 by ZIMA
;TCO 5.1054 - fix status race causing read-ahead problems in MTSTS.
; UPD ID= 66, SNARK:<4.1.MONITOR>MAGTAP.MAC.249, 30-Nov-79 10:37:06 by MILLER
; UP;TCO 4.2586. CLEAR BUFFER WORDS IN MTAFLA
; UPD ID= 18, SNARK:<4.1.MONITOR>MAGTAP.MAC.248, 27-Nov-79 12:44:53 by SCHMITT
;TCO 4.1.1029 - REMOVE CHECK FOR BUFFERS BEFORE WRITING TAPE MARKS
;<4.MONITOR>MAGTAP.MAC.247, 25-Oct-79 21:30:33, EDIT BY DBELL
;TCO 4.2552 - CHECK FOR ERRORS WHEN SPACING OR BACKSPACING FILES
;<4.MONITOR>MAGTAP.MAC.246, 4-Oct-79 15:57:05, EDIT BY MURPHY
;FIX BUG INTRODUCED BY PREVIOUS EDIT
;<4.MONITOR>MAGTAP.MAC.245, 20-Sep-79 15:46:42, EDIT BY HALL
;DUMPI AND DUMPO - APPLY PCS
;<OSMAN.MON>MAGTAP.MAC.1, 10-Sep-79 15:42:27, EDIT BY OSMAN
;TCO 4.2412 - Move definition of BUGHLTs, BUGCHKs, and BUGINFs to BUGS.MAC
;<4.MONITOR>MAGTAP.MAC.243, 11-Aug-79 22:26:53, EDIT BY ZIMA
;TCO 4.2387 - FIX BKUPDF BUGHLTS CAUSED BY DUMPO OF NONEXISTENT FILE PAGES
;<4.MONITOR>MAGTAP.MAC.242, 30-Jul-79 10:26:35, EDIT BY MILLER
;ONE MORE TRY. MAKE .MOCLE AND .MONOP REQUIRE MTA TO BE OPENED.
;<4.MONITOR>MAGTAP.MAC.241, 25-Jul-79 15:10:44, EDIT BY MILLER
;MOVE MTMTP1 LABEL TO INCLUDE CALLS TO MTACLW AND UPDSTS
;<4.MONITOR>MAGTAP.MAC.240, 11-Jun-79 19:18:21, EDIT BY MILLER
;MAKE FORWARD FILE RECOVER READ AHEAD BEFORE PROCEEDING.
;<4.MONITOR>MAGTAP.MAC.239, 11-Jun-79 09:34:09, EDIT BY MILLER
;MORE TCO 4.2281. FIX MTDIND TO DETECT RECORD LENGTH ERROR
;<4.MONITOR>MAGTAP.MAC.238, 10-Jun-79 14:21:53, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.237, 9-Jun-79 16:28:48, EDIT BY MILLER
;TCO 4.2281. ALLOW GDSTS TO RETURN STATUS OF LAST CALL, NOT NECESSARILY CURRENT
; STATUS
;<4.MONITOR>MAGTAP.MAC.236, 17-May-79 17:22:40, EDIT BY MILLER
;MAKE MTFLSH INTERNAL FOR USE BY TAPE
;<4.MONITOR>MAGTAP.MAC.235, 4-May-79 10:17:48, EDIT BY MILLER
;ALLOW MTOPR CODES 0 AND 31 EVEN IF MTA NOT OPENED
;<4.MONITOR>MAGTAP.MAC.234, 4-May-79 08:57:15, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.233, 20-Mar-79 13:53:05, EDIT BY MILLER
;FIX MTDIRQ TO PRE-WRITE PAGES FOR DUMPI
;<4.MONITOR>MAGTAP.MAC.232, 4-Mar-79 18:24:30, EDIT BY KONEN
;UPDATE COPYRIGHT FOR RELEASE 4
;<4.MONITOR>MAGTAP.MAC.231, 2-Mar-79 11:18:27, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.230, 1-Mar-79 17:26:18, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.229, 1-Mar-79 12:42:48, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.228, 1-Mar-79 12:05:37, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.227, 1-Mar-79 11:41:30, EDIT BY MILLER
;HANDLE READ AHEAD ERRORS WHEN DOING BACKSPACING
;<4.MONITOR>MAGTAP.MAC.226, 28-Feb-79 18:41:20, EDIT BY MILLER
;ADD MTAFLA
;<4.MONITOR>MAGTAP.MAC.225, 27-Feb-79 15:35:52, EDIT BY HALL
;CHANGE MTAINI TO INIT TAPE WORDS PROPERLY
;<2BOSACK>MAGTAP.MAC.1, 19-Feb-79 21:21:02, EDIT BY BOSACK
;RETURN HARDWARE DETERMINED DENSITY FOR READ DENSITY MTOPR
;<4.MONITOR>MAGTAP.MAC.223, 15-Feb-79 12:29:27, EDIT BY MILLER
;ADD SUPPORT FOR .MORVL. MAKE IT SAME ROUTINE AS .MOREW
;<4.MONITOR>MAGTAP.MAC.222, 10-Jan-79 14:06:40, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.221, 10-Jan-79 13:10:48, EDIT BY MILLER
;ADD CODE TO MTALOC THAT SETS VOLUME SET NAME
;<4.MONITOR>MAGTAP.MAC.220, 28-Dec-78 20:34:06, EDIT BY ZIMA
;TCO 4.2138 - CLEAR RH(AC3) FOR GDSTS
;<4.MONITOR>MAGTAP.MAC.219, 11-Dec-78 17:06:29, EDIT BY MILLER
;DON'T CHECK OFF-LINE OR WRITE-LOCKED IF DRIVE IS A TU7X
;<4.MONITOR>MAGTAP.MAC.218, 26-Nov-78 17:07:38, EDIT BY MILLER
;PASS CURRENT VOLUME NUMBER TO TAPE ON SETMTU FUNCTION
;<4.MONITOR>MAGTAP.MAC.217, 22-Nov-78 07:41:05, EDIT BY MILLER
;FIX MTALOC TO PASS DENSITY ON SETMTU CALL
;<4.MONITOR>MAGTAP.MAC.216, 22-Nov-78 07:33:29, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.215, 19-Nov-78 20:37:24, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.214, 24-Oct-78 14:06:41, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.213, 24-Oct-78 13:10:21, EDIT BY MILLER
;ADD LABELS READING TO MTALOC
;<4.MONITOR>MAGTAP.MAC.212, 23-Oct-78 12:43:31, EDIT BY MILLER
;REMOVE LABEL MTOPRS FROM MTA DISPATCH TABLE
;<4.MONITOR>MAGTAP.MAC.211, 19-Oct-78 14:55:16, EDIT BY R.ACE
;REARRANGED MTOPR DISPATCH TABLE AND LOGIC
;FIXED BUG IN .MOSTA MTOPR FUNCTION
;<4.MONITOR>MAGTAP.MAC.210, 16-Oct-78 09:24:40, EDIT BY MILLER
;MORE FIXES TO MATLOC
;<4.MONITOR>MAGTAP.MAC.209, 12-Oct-78 13:36:05, EDIT BY MILLER
;MAKE .MOLOC NOT REQUIRE JFN TO BE OPENED
;<4.MONITOR>MAGTAP.MAC.208, 12-Oct-78 11:27:17, EDIT BY MILLER
;FIX MTALOC
;<4.MONITOR>MAGTAP.MAC.207, 12-Oct-78 11:24:43, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.206, 11-Oct-78 11:21:46, EDIT BY MILLER
;FIX MTALOC TO PICK UP ARGS PROPERLY
;<4.MONITOR>MAGTAP.MAC.205, 2-Oct-78 13:46:33, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.204, 2-Oct-78 13:45:23, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.203, 2-Oct-78 13:40:43, EDIT BY MILLER
;<4.MONITOR>MAGTAP.MAC.202, 2-Oct-78 13:23:09, EDIT BY MILLER
;CHANGE .MOLOC FUNCTION
;<4.MONITOR>MAGTAP.MAC.201, 22-Aug-78 13:49:29, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.200, 17-Aug-78 21:13:38, EDIT BY PORCHER
;CHANGE "SETBW" TO "MTASBW" AND MAKE IT GLOBAL FOR TAPE
;<4.MONITOR>MAGTAP.MAC.199, 17-Aug-78 10:33:31, EDIT BY R.ACE
;TCO 1986 - FIX .MOSTA TO RETURN DEVICE TYPE CORRECTLY
;<4.MONITOR>MAGTAP.MAC.198, 15-Aug-78 23:58:55, Edit by MCLEAN
;DON'T BLOCK ON MOINF
;<4.MONITOR>MAGTAP.MAC.197, 28-Jul-78 00:00:48, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.196, 22-Jul-78 22:20:41, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.194, 22-Jul-78 22:16:54, Edit by MCLEAN
;TCO 1949 ADD WRITE/READ COUNT
;<4.MONITOR>MAGTAP.MAC.193, 21-Jul-78 14:55:27, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.192, 21-Jul-78 14:52:11, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.191, 21-Jul-78 03:38:17, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.190, 21-Jul-78 03:34:11, Edit by MCLEAN
;TCO 1950 FIX MTAINF SO IT HAS ERJMP AFTER UMOVEM
;<4.MONITOR>MAGTAP.MAC.189, 20-Jul-78 00:38:17, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.188, 20-Jul-78 00:16:34, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.187, 19-Jul-78 11:55:22, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.186, 19-Jul-78 01:34:45, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.185, 19-Jul-78 01:31:57, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.184, 18-Jul-78 14:11:55, Edit by MCLEAN
;FIX MTALN JSYS SO IT IS THE NEW ONE
;<4.MONITOR>MAGTAP.MAC.183, 18-Jul-78 00:41:55, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.182, 18-Jul-78 00:32:19, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.181, 18-Jul-78 00:08:53, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.180, 17-Jul-78 23:50:16, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.179, 17-Jul-78 23:44:13, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.178, 17-Jul-78 23:25:31, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.177, 17-Jul-78 23:23:36, Edit by MCLEAN
;<4.MONITOR>MAGTAP.MAC.176, 17-Jul-78 23:15:58, Edit by MCLEAN
;TCO 1939 PSI FOR ONLINE/OFFLINE MTA'S
;<4.MONITOR>MAGTAP.MAC.175, 14-Jul-78 01:03:35, Edit by MCLEAN
;ADD OPENED CHECK TO MTOPR
;<4.MONITOR>MAGTAP.MAC.174, 13-Jul-78 18:33:16, Edit by ENGEL
;PUT MTMXDM BACK IN MAGTAP WHERE IT BELONGS
;<4.MONITOR>MAGTAP.MAC.173, 12-Jul-78 03:17:58, Edit by MCLEAN
;TCO 1940 STARTED (RETURN TAPE STATUS)
;<4.MONITOR>MAGTAP.MAC.172, 22-Jun-78 14:48:47, Edit by FORTMILLER
;TCO 1925 Fix MTOPR function .MOINF to return Magtape type code
; in word .MOITP
;<4.MONITOR>MAGTAP.MAC.171, 15-Jun-78 15:31:32, Edit by MCLEAN
;TCO 1921 MAKE GDSTS RETURN DEFAULT DENSITY ALWAYS... NO LONGER
;SUPPORTED
;<4.MONITOR>MAGTAP.MAC.170, 14-Jun-78 07:11:04, Edit by JBORCHEK
;DELETE ASSIGNMENT TO MTMXDM, IT IS DONE CORRECTLY IN STG
;<4.MONITOR>MAGTAP.MAC.169, 6-Jun-78 15:11:19, EDIT BY MILLER
;CHECK FOR NEGATIVE CODE IN MAGTAP MTOPR
;<4-NEW>MAGTAP.MAC.168, 1-Jun-78 15:00:53, Edit by FORTMILLER
;ADD DX20 SUPPORT
;<3A.MONITOR>MAGTAP.MAC.7, 4-May-78 05:52:42, Edit by MCLEAN
;TEMP FIX TO REMOVE .MTT16
;<3A.MONITOR>MAGTAP.MAC.6, 2-May-78 23:05:53, Edit by MCLEAN
;PERMIT READ BACKWARDS FOR KS10
;<2BOSACK>MAGTAP.MAC.1, 24-Feb-78 01:41:48, EDIT BY BOSACK
;CHANGE TO NEW DEVICE/DATA ERROR BITS
;<3.SM10-RELEASE-3>MAGTAP.MAC.4, 9-Jan-78 16:29:10, EDIT BY ENGEL
;TCO #1890 FIX INCORRECT RECORD COUNT IN MTOPR .MOINF (REVERSE WORDS 6 AND 7)
;<3.SM10-RELEASE-3>MAGTAP.MAC.2, 13-Nov-77 14:41:03, Edit by MCLEAN
;READ BACKWARDS ILLEGAL ON KS10
;<4.MONITOR>MAGTAP.MAC.163, 5-Nov-77 00:24:01, EDIT BY CROSSLAND
;FIX MTOPR SO YOU CAN GET NUMBER OF HARD ERRORS.
;<4.MONITOR>MAGTAP.MAC.162, 5-Oct-77 10:13:29, Edit by HESS
;TCO 1873 - ADD FUNCTIONS TO MTALN JSYS
;<4.MONITOR>MAGTAP.MAC.161, 19-Aug-77 14:41:58, Edit by HESS
;ADD ROUTINE FOR TAPE TO CALL TO CLEAR EOF AND ABORTF
; COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1976, 1988.
; ALL RIGHTS RESERVED.
;
; THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
; ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
; INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
; COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
; OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
; TRANSFERRED.
;
; THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
; AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
; CORPORATION.
;
; DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
; SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
SEARCH PROLOG,PHYPAR
TTITLE MAGTAP
;TEMP EXTERNAL DEFS
EXTN <SETT20>
;SPECIAL AC DEFINITIONS USED HEREIN
DEFAC (U,Q1) ;UNIT NUMBER
DEFAC (IOS,Q2) ;STATUS BITS FROM MTASTS
DEFAC (STS,P1) ;DEVICE STATUS
DEFAC (JFN,P2) ;JFN
DEFAC (DEV,P4) ;DEVICE DISPATCH ADR
;DEFAULT VALUES FOR MAGTAPES
MTSPCN==5 ;MAX # OF SPACING OPERATIONS AT 1 TIME
MINREC==4 ;MINIMUM # OF WORDS FOR OUTPUT RECORD
;BIT DEFINITIONS FOR LH OF MTASTS
OPN==1B0 ;UNIT HAS BEEN OPENED
OPND==:1B2 ;UNIT WAS OPENED FOR DUMP MODE
DMPWT==1B3 ;WAITING FOR A DUMP MODE OP TO FINISH
LTERR==1B4 ;ERROR OCCURED ON LAST DUMP MODE OPER.
BUFA==1B5 ;BUFFERS HAVE BEEN ASSIGNED
CLOF==1B6 ;CLOSF IN PROGRESS
MTOWT==1B7 ;MTOPR IN PROGRESS
MTIEL==1B8 ;INHIBIT ERROR LOGGING
MTNOWT==1B9 ;DON'T SET MTOWT
;BITS IN RH OF MTASTS (DEFINED IN MONSYM)
;DATA STRUCTURE DEFINITIONS
DEFSTR (MTRS,MTANR1(U),35,18) ;RECORD SIZE IN HARDWARE BYTES
DEFSTR (MTDM,MTANR1(U),17,3) ;DATA MODE
DEFSTR (MTDN,MTANR1(U),14,4) ;DENSITY
DEFSTR (MTSTC,MTANR1(U),10,3) ;CLOSF FUNCTION COUNTER
DEFSTR (MTRBF,MTANR1(U),7,1) ;READING BACKWARDS FLAG
DEFSTR (MTPAR,MTANR1(U),6,1) ;PARITY
DEFSTR (MTFCN,MTANR1(U),5,4) ;LAST FUNCTION PERFORMED
DEFSTR (MTNTM,MTANR1(U),1,2) ;COUNT OF EOF'S WRITTEN
DEFSTR (MTBYT,MTANR2(U),17,18) ;INITIAL LH OF FILBYT
DEFSTR (MTBUF,MTANR2(U),35,18) ;POINTER TO START OF LIST OF BUF PAGES
DEFSTR (MTCUB,MTANR3(U),23,6) ;CURRENT USER BUFFER
DEFSTR (MTCSB,MTANR3(U),17,6) ;CURRENT SERVICE ROUTINE BUFFER
DEFSTR (MTUBW,MTANR3(U),11,6) ;USER BYTES PER WORD
DEFSTR (MTHBW,MTANR3(U),5,6) ;HARDWARE BYTES PER WORD
DEFSTR (MTCUP,MTANR4(U),35,18) ;CURRENT USER PAGE
DEFSTR (MTCIRB,MTANR4(U),17,18) ;CURRENT IORB IN USE
DEFSTR (MTUBP,MTANR5(U),35,18) ;USER BYTES PER PAGE
DEFSTR (MTUBB,MTANR5(U),17,18) ;USER BYTES PER BUFFER
DEFSTR (MTLIRB,MTANR6(U),35,18) ;LAST IORB ADR FOR DUMP MODE
DEFSTR (MTALTC,MTANR6(U),17,18) ;LAST TRANSFER COUNT
DEFSTR (MTNIR,MTARS1(U),35,6) ;# OF IORB'S QUEUED UP
DEFSTR (MTANIR,MTARS1,35,6) ;ABSOULTE VERSION OF MTNIR
DEFSTR (MTPPB,MTARS1(U),29,9) ;NUMBER OF PAGES PER BUFFER
DEFSTR (ABORTF,MTARS1,20,1) ;AN ERROR OCCURED AND IORB'S ABORTED
DEFSTR (IRFLG,MTIRSD,8,9) ;FLAGS FOR USE BY HIGH LEVEL ROUTINE
MSKSTR (IRBFR,MTIRSD,1B0) ;BUFFER READY FOR USER
MSKSTR (IRBFQ,MTIRSD,1B1) ;CURRENT BUFFER FLAG
MSKSTR (IRBFA,MTIRSD,1B2) ;ACTIVE FLAG, IORB BEING FILLED
; OR EMPTIED BY SERVICE ROUTINE
MSKSTR (IRBAB,MTIRSD,1B3) ;IORB ABORTED DUE TO AN ERROR
MSKSTR (IRBFF,MTIRSD,1B4) ;IORB IS FREE
DEFSTR (IRBUN,MTIRSD,17,9) ;UNIT NUMBER
DEFSTR (IRBPB,MTIRSD,35,18) ;POINTER TO BUFFER OF PAGE POINTERS
DEFSTR (IRBOC,MTIRSD+1,35,18) ;ORIGINAL COUNT
DEFINE MTERET (X) <
IFNB <X>,<
JRST [ MOVEI A,X
MOVX IOS,MT%DVE
IORB IOS,MTASTS(U)
TQO <ERRF>
RET]>
IFB <X>,<
JRST [ MOVX IOS,MT%DVE
IORB IOS,MTASTS(U)
TQO <ERRF>
RET]>>
;MAGTAPE DISPATCH TABLE
SWAPCD
MTADTB::MTADTL ;LENGTH
DTBDSP (MTASET) ;SET DIRECTORY
DTBDSP (MTANAM) ;LOOKUP NAME
DTBDSP (MTAEXT) ;LOOKUP EXTENTION
DTBDSP (MTAVER) ;LOOKUP VERSION
DTBBAD (DESX9) ;PROTECTION INSERTION
DTBBAD (DESX9) ;ACCOUNT INSERTION
DTBBAD (DESX9) ;STATUS INSERTION
DTBDSP (MTAOPN) ;OPENF
DTBDSP (MTASQI) ;BIN/SIN
DTBDSP (MTASQO) ;BOUT/SOUT
DTBDSP (MTACLZ) ;CLOSF
DTBDSP (MTAREN) ;RENAME
DTBDSP (MTADEL) ;DELETE
DTBDSP (MTDMPI) ;DUMPI
DTBDSP (MTDMPO) ;DUMPO
DTBDSP (MTAMNT) ;MOUNT
DTBDSP (MTADSM) ;DISMOUNT
DTBDSP (MTINID) ;INIT DIRECTORY
DTBDSP (MTMTAP) ;MTOPR
DTBDSP (MTGTS) ;GETSTS
DTBDSP (MTSTS) ;SETSTS
DTBDSP (MTRECO) ;RECORD OUT
DTBDSP (RFTADN) ;READ TAD
DTBDSP (SFTADN) ;SET TAD
DTBDSP (BIOINP) ;SET JFN FOR INPUT
DTBDSP (BIOOUT) ;SET JFN FOR OUTPUT
DTBBAD (GJFX49) ;CHECK ATTRIBUTE
DTBSKP ;RELEASE JFN
MTADTL==:.-MTADTB ;GLOBAL LENGTH OF DISPATCH TABLE
;ROUTINE TO INITIALIZE THE MAGTAP DATA STRUCTURES
SWAPCD
MTAINI::MOVSI A,-MTAN ;SET UP TO INIT UNITS
MTINI2: SETOM MTALCK(A) ;INIT LOCK WORD
SETZM MTASTS(A) ;ZERO STATUS WORD ALSO
SETZM TLABL0(A) ;CLEAR ALL STATUS BITS
SETZM TLABL1(A) ;CLEAR MT STATUS
AOBJN A,MTINI2 ;LOOP BACK FOR ALL UNITS
RET ;ALL DONE
;ROUTINE TO MOUNT A MAGTAPE UNIT
MTAMNT: RETSKP
;ROUTINE TO DISMOUNT A MAGTAPE UNIT
MTADSM: RETSKP
;ROUTINE TO INITIALIZE THE DIRECTORY OF A MAGTAPE
MTINID: RETBAD (DESX9)
;ROUTINE TO SET THE DIRECTORY
MTASET: TQO NNAMF
RETBAD (GJFX32) ;NO FILES IN DIR
;ROUTINE TO LOOKUP A NAME ON A MAGTAPE UNIT
MTANAM: RETBAD (DESX9)
;ROUTINE TO FIND AN EXTENTION
MTAEXT: RETBAD (DESX9)
;ROUTINE TO FIND A VERSION
MTAVER: MOVEI A,0
RETSKP
;ROUITNE TO DO RENAME ON A MAGTAPE
MTAREN: RETBAD (DESX9)
;ROUTINE TO DELETE
MTADEL: RETBAD (DESX9)
;ROUTINE TO GET MAGTAP STATUS BITS
MTGTS:: HLRZ U,DEV ;SET UP UNIT NUMBER
CALL UPDSTS ;UPDATE THE STATUS
RET ;NEED TO BLOCK
MTGTS0: HRRZ A,MTASTS(U) ;GET CURRENT STATUS BITS
LOAD B,MTALTC ;GET LAST TRANSFER COUNT
XCTU [HRLZM B,3] ;GIVE IT TO USER
SETZ B,0 ;DENSITY (DEFAULT (NO LONGER SUPPORTED))
DPB B,[POINTR A,MT%DEN] ;DOESNT HANDLE 1600 BPI TOO WELL
LOAD B,MTPAR ;GET PARITY
DPB B,[POINTR A,MT%EVP]
RET ;RETURN WITH STATUS IN A
;ROUTINE TO SET THE MAGTAP STATUS BITS
MTSTS:: STKVAR <MTSTSA,MTSTSE>
SETZM MTSTSE ;ZERO THE ERROR BIT
MOVEM A,MTSTSA ;SAVE NEW STATUS SETTING
HLRZ U,DEV ;SET UP UNIT NUMBER
CALL MTACLW ;WAIT FOR ACTIVITY TO CEASE
RET ;NEED TO BLOCK
CALL UPDSTS ;UPDATE THE STATUS
RET ;NEED TO BLOCK
MOVE A,MTASTS(U) ;GET CURRENT STATUS
TXNE A,MT%DAE!MT%DVE!MT%IRL!MT%EOF!MT%EOT
SETOM MTSTSE ;THERE WAS AN ERROR AT START OF THIS
MOVE A,MTSTSA ;GET BACK NEW SETTING
ANDI A,MT%DAE!MT%DVE!MT%IRL!MT%EOT!MT%EOF!MT%SER!MT%EVP!MT%DEN
MOVX B,MT%DAE!MT%DVE!MT%IRL!MT%EOT!MT%EOF!MT%SER!MT%EVP!MT%DEN
ANDCAM B,MTASTS(U) ;CLEAR BITS BEING SPECIFIED BY USER
IORB A,MTASTS(U) ;SET BITS FROM USER
LDB B,[POINTR A,MT%EVP] ;GET PARITY
STOR B,MTPAR
HRRZ B,MTCUTB(U) ;GET UDB ADDRESS
MOVE B,UDBCHR(B) ;GET THE CHARACTERISTICS WORD
TXNE B,UC.625 ;IS DRIVE CAPABLE OF 6250?
JRST MTSTS2 ;YES, DON'T STORE INTO DENSITY FIELD OF UDB
LDB B,[POINTR A,MT%DEN] ;AND DENSITY (NOT GOOD FOR 1600 BPI)
SKIPN B ;DEFAULT WANTED
JRST [ LOAD B,JSMTD ;YES, GET DEFAULT DENSITY
SKIPN B
MOVEI B,MTDFDN ;IF NO JOB DEFAULT, USE SYSTEM DEFAULT
JRST .+1]
STOR B,MTDN
MTSTS2: SKIPE MTSTSE ;ANY ERRORS AT START?
TXNE A,MT%DAE!MT%DVE!MT%IRL!MT%EOT!MT%EOF
RET ;IF THERE ARE STILL SOME ERRORS, RETURN
TQZ <ERRF,EOFF> ;CLEAR ERROR FLAGS
JE ABORTF,(U),R ;IF ABORTF NOT ON ALREADY, DONT CLEAR IT
SETZRO ABORTF,(U) ;ZERO THE ABORT FLAG
RET ;AND EXIT
;ROUTINE TO UPDATE MTASTS
; CALL UPDSTS
;RETURNS +1: NEEDS TO BLOCK
; +2: OK
UPDSTA: TDZA C,C ;ALWAYS DO UPDATE
UPDSTS: MOVEI C,1 ;DO NORMAL SEQUENTIAL STUFF
CALL SETWLK ;GO SET WRITE LOCK BIT CORRECTLY
JUMPE C,UPDST1 ;IF FORCED UPDATE, GET TO IT
LOAD A,MTFCN ;GET FUNCTION CODE OF LAST OPERATION
CAIE A,IRFRED ;READ?
CAIN A,IRFRDR ;OR READ BACKWARDS?
SKIPA IOS,MTASTS(U) ;YES
JRST UPDST1 ;NO, GO WAIT FOR ACTIVITY TO FINISH
TXNN IOS,OPND ;OPENED FOR SEQUENTIAL READ?
RETSKP ;YES, STATUS GETS UPDATED LATER
UPDST1: CALL MTACLW ;WAIT FOR ACTIVITY TO STOP
RET ;NEED TO BLOCK
CALL MTFLSH ;GO UPDATE STATUS FROM EACH IORB
TQZ <BLKF> ;DONT WANT TO BLOCK
CALL SETBOT ;SET BOT BIT IN STATUS WORD
RETSKP ;ALL DONE
;ROUTINE TO SET THE WRITE LOCK BIT CORRECTLY IN MTASTS
SETWLK: HRRZ A,MTCUTB(U) ;GET UDB ADR
MOVE A,UDBSTS(A) ;GET STATUS OF DRIVE
MOVX B,MT%ILW ;GET WRITE LOCK BIT IN STATUS WORD
ANDCAM B,MTASTS(U) ;START BY CLEARING IT
TXNE A,US.WLK ;IS THIS DRIVE WRITE LOCKED?
IORM B,MTASTS(U) ;YES, SET THE BIT IN THE STATUS WORD
RET ;ALL DONE
;ROUTINE TO SET UP MT%BOT
SETBOT: HRRZ A,MTCUTB(U) ;GET UDB ADR
MOVE A,UDBSTS(A) ;GET STATUS BITS
MOVX B,MT%BOT ;FIRST CLEAR THE BIT
ANDCAM B,MTASTS(U)
TXNE A,US.BOT ;AT BOT?
IORM B,MTASTS(U) ;YES, SET THE BIT
RET
;ROUTINE TO OPEN A MAG TAPE UNIT FOR READING OR WRITING
;CALLED BY OPENF
MTAOPN::STKVAR <DRVTYP> ;SAVE DRIVE TYPE HERE
SETZM DRVTYP ;ASSUME NOT TU7X
HLRZ U,DEV ;SET UP UNIT NUMBER
TXNE STS,READF!WRTF ;MUST BE OPENED FOR AT LEAST ONE
TXNE STS,XCTF!RNDF!NONXF
RETBAD (OPNX15) ;ILLEGAL MODE FOR OPENING
SKIPN A,MTCUTB(U) ;GET UDB ADR
JRST MTAOFL ;IF NO UNIT, PRETEND IT IS OFF-LINE
HRRZS A ;GET ADDRESS ONLY
LOAD B,USTYP,(A) ;GET DRIVE TYPE
CAIL B,.UTT70 ;A TU7X?
CAILE B,.UTT73 ;STILL?
SKIPA ;NO.
JRST [ SETOM DRVTYP ;YES. SAY SO
JRST MTAOP2] ;AND PROCEED
JN USOFL,(A),[CALL CHKOFL ;SEE IF OPENS ALLOWED IF OFFLINE
JRST MTAOFL ;NO
JRST .+1] ;YES
MTAOP2: LDB A,[POINT 4,STS,35] ;GET DATA MODE
CAIE A,17 ;MUST BE 0 OR 17
JUMPN A,MTAILM ;ILLEGAL MODE IF NOT 0 OR 17
LOCK MTALCK(U),<CALL LCKTST> ;PREVENT MULTIPLE OPENS
MOVX IOS,OPN ;SEE IF UNIT IS ALREADY OPENED
TDNE IOS,MTASTS(U) ;...
JRST BUSY ;YES, DONT OPEN IT TWICE
CAIN A,17 ;DUMP MODE?
TXO IOS,OPND ;YES, REMEMBER THAT FOR CLOSE
TXC STS,WRTF!READF ;SEE IF OPEN FOR BOTH READ AND WRITE
TXCN STS,WRTF!READF ;ONLY ALLOWED IF DUMP MODE
CAIN A,17 ;OPEN FOR BOTH, IS THIS DUMP MODE?
SKIPA ;YES, OK
JRST MTAISM ;ILLEGAL SEQUENTIAL I/O MODE
MOVEM IOS,MTASTS(U) ;MARK THAT UNIT IS NOW OPENED
CALL SETWLK ;SET THE WRITE LOCK BIT CORRECTLY
MOVE IOS,MTASTS(U) ;GET STATUS AGAIN
SKIPE DRVTYP ;A TU7X?
JRST MTOPNX ;YES. DON'T CHECK WRITE LOCKED
TXNE IOS,MT%ILW ;IS DRIVE WRITE LOCKED?
TQNN <WRTF> ;YES, IS THIS A WRITE OPENF?
SKIPA ;NO, THEN DONT COMPLAIN ABOUT WRITE LOCK
JRST MTAWLK ;GO COMPLAIN THAT DRIVE IS WRITE LOCKED
MTOPNX: SETZM MTANR1(U) ;INITIALIZE PER UNIT STORAGE
SETZM MTANR2(U)
SETZM MTANR3(U)
SETZM MTANR4(U)
SETZM MTANR5(U)
SETZM MTANR6(U)
SETZM MTARS1(U)
LOAD A,JSMTR ;GET DEFAULT RECORD SIZE
SKIPG A ;IS THE DEFAULT SET?
MOVEI A,MTDFRS ;NO, USE SYSTEM DEFAULT VALUE
STOR A,MTRS ;USE THIS UNLESS CHANGED BEFORE BIN 1
LOAD A,JSMTM ;GET DATA MODE
SKIPG A ;IS IT SET YET?
MOVEI A,MTDFDM ;NO, USE SYSTEM DEFAULT VALUE
STOR A,MTDM
;..
;..
CALL MTASBW ;SET UP BYTES PER WORD, ETC.
JRST MTOPNF ;FAILED
LOAD A,JSMTD ;AND ALSO GET THE DEFAULT DENSITY
SKIPG A ;SPECIFIED?
MOVEI A,MTDFDN ;NO, USE SYSTEM DEFAULT VALUE
STOR A,MTDN
LOAD A,JSMTP ;GET DEFAULT PARITY
STOR A,MTPAR ;STORE PARITY
SETZM FILCNT(JFN) ;INITIALIZE COUNT OF BYTES IN BUFFER
SETZM FILLEN(JFN) ;INITIALIZE LENGTH OF CURRENT BUFFER
SETZM FILBYN(JFN) ;AND BYTE POSITION
MOVEI A,^D36 ;SET UP BYTE POSITION
STOR A,FLBPO,(JFN) ;STORE IN FILBYT
HLRZ A,FILBYT(JFN) ;GET INITIAL BYTE POINTER
STOR A,MTBYT ;SAVE FOR LATER
SETZRO MTNIR ;INIT COUNT OF IORB'S IN QUEUE
MOVEI A,MTBUFN*MTIRBL ;NOW INITIALIZE THE IORB'S
IMULI A,(U) ;GET START OF IORB AREA
ADDI A,MTIRBF ;GET ABS ADR OF IORB
MOVSI B,-MTBUFN ;SET UP COUNT
MTAOP1: MOVSI C,(A) ;ZERO IORB
HRRI C,1(A)
SETZM 0(A)
BLT C,MTIRBL-1(A) ;INITIALIZED TO ALL ZEROS
SETONE IRBFF,(A) ;YES, MARK ALL BUFFERS AS FREE
STOR U,IRBUN,(A) ;SAVE UNIT NUMBER FOR INTERRUPT LEVEL
ADDI A,MTIRBL ;STEP TO NEXT IORB
AOBJN B,MTAOP1 ;LOOP BACK FOR ALL IORB'S
MOVEI A,<MAXPPB+1>*MTBUFN ;GET ADDRESS OF START OF LIST
IMULI A,(U) ; FOR THIS UNIT
ADDI A,MTAPBF ;ADD IN BASE ADR OF PAGE BUFFER AREA
STOR A,MTBUF ;REMEMBER ADR OF LIST
STOR A,MTCUP ;SET UP CURRENT P TO BE EMPTIED
SETZRO MTCUB ;START AT BUFFER 0
SETZRO MTCSB ;FOR BOTH USER AND SERVICE ROUTINE BUF'S
MOVE A,JOBNO ;GET USER PROGRAM NAME FOR SYSERR
MOVE B,JOBPNM(A)
HRRZ C,MTCUTB(U) ;GET UDB ADR
MOVEM B,UDBPNM(C) ;STORE PROGRAM NAME IN UDB
HRR B,JOBDIR(A) ;GET LOGGED-IN DIRECTORY
HRLI B,USRLH ;MAKE IT A USER NUMBER
MOVEM B,UDBUDR(C) ;STORE IT IN UDB ALSO
UNLOCK MTALCK(U) ;UNLOCK THE LOCK ON THIS UNIT
RETSKP ;SUCCESSFULLY OPENED
BUSY: SKIPA A,[OPNX9] ;UNIT ALREADY OPENED
MTOPNF: SETZM MTASTS(U) ;CLEAR STATUS WORD
UNLOCK MTALCK(U) ;UNLOCK THIS UNIT
RET ;NOT OPENED!
MTAILM: MOVEI A,OPNX14 ;ILLEGAL MODE
RET
MTAOFL: MOVEI A,OPNX8 ;DEVICE IS OFF-LINE
RET
MTAWLK: MOVEI A,OPNX25 ;RETURN WRITE LOCKED ERROR CODE
JRST MTOPNF ;OPENF FAILED
MTAISM: MOVEI A,OPNX15 ;ILLEGAL SEQUENTIAL I/O MODE
JRST MTOPNF ;GO UNLOCK AND BOMB OUT
;ROUTINE TO SET UP MTUBW, MTHBW, MTUBB, AND MTUBP
MTASBW:: LOAD A,MTDM ;GET DATA MODE
CAILE A,MTMXDM ;LEGAL MODE?
RETBAD (MTOX5) ;NO
MOVE A,HBWTB(A) ;GET BYTES PER WORD
STOR A,MTHBW ;SAVE HARDWARE BYTES PER WORD
LDB A,PBYTSZ ;GET SIZE OF USER BYTES
MOVEI C,^D36 ;GET USER BYTES PER WORD
SKIPN A ;SIZE = 0?
MOVEI A,^D36 ;YES, PRETEND IT IS WORD MODE
IDIV C,A ;GET BYTES PER WORD
STOR C,MTUBW ;USER BYTES PER WORD
LOAD A,MTRS ;NOW CALCULATE USER BYTES PER BUFFER
IMUL A,C ;RECORD SIZE * USER BYTES PER WORD
OPSTR <IDIV A,>,MTHBW ;NOW HAVE DESIRED VALUE
SKIPE B ;ANY REMAINING BITS IN RECORD?
AOS A ;YES, INCR USER BYTES PER BUFFER
STOR A,MTUBB ;SAVE COUNT OF USER BYTES PER BUFFER
IMULI C,PGSIZ ;GET USER BYTES PER PAGE
STOR C,MTUBP ;SAVE USER BYTES PER PAGE
IDIV A,C ;SEE IF RECORD SIZE TOO LARGE
SKIPE B ;GET NUMBER OF PAGES PER BUFFER
AOS A ;PARTIAL PAGE
CAILE A,MAXPPB ;WITHIN LEGAL RANGE?
RETBAD (MTOX4) ;NO
RETSKP ;EXIT OK
HBWTB: 1 ;TABLE OF HARDWARE BYTES PER WORD
1 ;36 BIT BYTES
6 ;6 BIT BYTES
5 ;7 BIT BYTES
4 ;8 BIT BYTES
1 ;36 BIT BYTES (HI-DENSITY)
MTMXDM==:.-HBWTB-1
;ROUTINE TO CLOSE A MAGTAPE UNIT
;CALLED BY CLOSF
MTACLZ::HLRZ U,DEV ;SET UP UNIT NUMBER
MOVX IOS,MTOWT!DMPWT ;CLEAR WAIT FLAGS
ANDCAB IOS,MTASTS(U)
TXNN IOS,CLOF ;ALREADY STARTED THE CLOSE?
JRST [ SETZRO MTSTC ;NO, INITIALIZE CLOSE FUNCTION COUNT
MOVX IOS,CLOF ;AND MARK THAT CLOSE IS IN PROGRESS
IORB IOS,MTASTS(U)
TXNN IOS,OPND ;DUMP MODE?
JRST .+1 ;NO
INCR MTSTC ;YES, DONT FORCE OUT LAST BUFFER
JRST .+1]
TXNE A,CZ%ABT ;AN ABORT TYPE CLOSE?
JRST MTACLA ;YES, GO ABORT
CALL MTACLW ;WAIT FOR ACTIVITY TO CEASE
RET ;NEED TO BLOCK
MOVE IOS,MTASTS(U) ;GET STATUS
TQNE <WRTF> ;WRITING?
JRST MTACL1 ;YES, GO CLOSE THE WRITE
TXNN IOS,OPND ;DUMP MODE
TQNN <READF> ;NO, READING?
JRST MTACLR ;NOTHING TO DO
SETZRO ABORTF,(U) ;CLEAR ERROR ABORT BIT
CALL MTPOS0 ;SEQUENTIAL READ, GO LEAVE TAPE IN
RET ; CORRECT POSITION
CALL MTACLW ;WAIT FOR ACTIVITY TO STOP
RET ;NEED TO BLOCK
JRST MTACLR
MTACL1: CALL MTACLW ;WAIT FOR ALL ACTIVITY TO STOP
RET ;NEED TO BLOCK
MOVE IOS,MTASTS(U) ;GET STATUS FLAGS
TXNE IOS,MT%DAE!MT%DVE ;ERROR IN PROGRESS?
RETBAD (IOX5) ;YES, GIVE ERROR RETURN
LOAD A,MTSTC ;GET CLOSE FUNCTION COUNT
CAIL A,MTACLN ;FINISHED YET?
JRST MTACLR ;YES, GO RELEASE PAGES
XCT MTACLT(A) ;PERFORM THE NEXT FUNCTION IN LIST
RET ;NEED TO BLOCK
INCR MTSTC ;STEP TO NEXT FUNCTION TO BE DONE
JRST MTACL1 ;LOOP BACK TIL CLOSE IS COMPLETE
MTACLT: CALL MTRECO ;FORCE OUT THE LAST PARTIAL BUFFER
CALL MTCHKE ;CHECK IF EOF'S NEED WRITING
CALL MTABKE ;THEN BACKSPACE OVER SECOND EOF
CALL MTFLSH ;FLUSH OUT ALL REMAINING IORBS
MTACLN==.-MTACLT ;NUMBER OF FUNCTIONS IN TABLE
MTACLA: NOSKED ;DONT ALLOW SCHEDULING
CALL MTAKIL ;KILL ALL REQUESTS IN QUEUE
OKSKED
MTCLA1: LOAD A,MTNIR ;GET NUMBER OF IORBS STILL ACTIVE
JUMPE A,MTACLR ;IF NONE, CLOSE OUT
MOVEI A,MTAWAT ;WAIT FOR IT TO FINISH
HRL A,U
MDISMS
JRST MTCLA1 ;LOOP BACK TO CHECK IF DONE
;ROUTINE TO CHECK IF EOF'S SHOULD BE WRITTEN
; CALL MTCHKE
;RETURNS +1: NEED TO BLOCK
; +2: EOF'S WRITTEN OR NOT NEEDED
MTCHKE: LOAD A,MTFCN ;GET LAST FUNCTION PERFORMED
CAIE A,IRFWRT ;A WRITE?
CAIN A,IRFWTM ;OR WRITE TAPE MARK?
SKIPA A,[2] ;YES, GO MAKE SURE TWO EOF'S ARE WRITTEN
RETSKP ;NO NEED FOR ANY EOF'S
CALLRET MTAWTM ;GO WRITE TAPE MARKS
;ROUTINE TO BACKSPACE OVER SECOND TAPE MARK
MTABKE: LOAD A,MTFCN ;GET LAST FUNCTION
CAIE A,IRFWTM ;MUST HAVE BEEN WRITE TAPE MARK
RETSKP ;NOTHING TO BE DONE IF NOT
LOAD A,MTNTM ;GET # OF TAPE MARKS WRITTEN
CAIE A,2 ;EXACTLY 2?
RETSKP ;NO, ALL DONE
CALL GETIRB ;GET AN IORB TO USE
RET ;MUST WAIT FOR ONE
MOVEI B,IRFBSB ;GET FUNCTION CODE OF BACKSPACE BLOCK
MOVEI C,1 ;DO ONE
CALL MTPIRQ ;QUEUE IT UP
RETSKP ;ALL DONE
;SPECIAL ROUTINE USED BY TAPE TO "RETIRE" ALL IORBS.
;THIS IS NEEDED WHEN DUMP MODE AND SEQ MODE CONFLCIT
;E.G. IF A LABEL IS READ IN DUMP MODE AND THEN A
;POSITIONING OPERATION IS PERFORMED WITH THE TAPE
;OPENED FOR SEQ ACCESS, THE CODE IN MAGTAP REALLY SCREWS UP.
MTAFLA::CALL MTFLSH ;RETIRE ALL REQUESTS
TQZ <BLKF> ;IGNORE BLOCK REQUEST
SETZM FILLEN(JFN)
SETZM FILCNT(JFN)
SETZM FILBYN(JFN) ;NO MORE BUFFER ACTIVE
RET ;AND DONE
;ROUTINE TO WAIT FOR ALL IORB'S TO BE FINISHED
; CALL MTACLW
;RETURNS +1: NEEDS TO BLOCK
; +2: NO IORB'S LEFT IN QUEUE
MTACLW: LOAD A,MTNIR ;GET NUMBER OF IORB'S IN QUEUE
JUMPE A,RSKP ;IF NONE, RETURN
MOVEI A,MTAWAT ;SET UP TO WAIT FOR REQUESTS TO FINISH
HRL A,U ;FOR THIS UNIT
TXO STS,BLKF ;SET WAIT FLAG FOR IO
RET ;AND GIVE NON-SKIP RETURN
MTACLR: CALL MTARLB ;RELEASE PAGES (IF ANY)
SETZM MTASTS(U) ;INITIALIZE STATUS
RETSKP ;CLOSE IS COMPLETE
;ROUTINE TO WAIT FOR ALL REQUESTS TO BE FINISHED
RESCD
MTAWAT::LOAD B,MTANIR,(A) ;GET NUMBER OF IORB'S OUTSTANDING
JUMPLE B,1(4) ;IF 0, RETURN +2
JRST 0(4) ;OTHERWISE CONTINUE WAITING
SWAPCD
;ROUTINE TO RETURN ALL IORBS TO THE FREE STATE AND CHECK FOR I/O ERRORS
; CALL MTFLSH
;RETURNS +1: NEED TO BLOCK
; +2: OK
MTFLSH::SAVEQ
CALL MTACLW ;WAIT FOR ALL QUIET
RET ;NEED TO BLOCK
MOVEI Q3,MTBUFN ;SET UP COUNT OF IORBS
MTFL0: CALL GETIRB ;GET NEXT IORB
JRST MTFL1 ;IGNORE ERRORS, (THEY WERE ADDED TO MTASTS)
CALL IRBDON ;YES, MARK IT DONE
JFCL ;IGNORE ERRORS
MTFL1: LOAD B,MTCSB ;STEP TO NEXT IORB
AOS B
IDIVI B,MTBUFN
STOR C,MTCSB
SOJG Q3,MTFL0 ;LOOP BACK FOR ALL IORBS
TQZ <BLKF> ;MAKE SURE WAIT FLAG IS NOT SET
RETSKP ;ALL FLUSHED OUT
;ROUTINE TO DO SEQUENTIAL INPUT FROM MAGTAPE
MTASQI::HLRZ U,DEV ;SET UP UNIT NUMBER
CALL MTAASB ;GO ASSIGN BUFFER SPACE (IF NEEDED)
MTERET () ;NO ROOM IN JSB FOR BUFFERS
MOVX IOS,MTOWT ;CLEAR MTOPR WAIT FLAG
ANDCAB IOS,MTASTS(U)
LOAD A,MTFCN ;GET LAST FUNCTION DONE
CAIE A,IRFRED ;LAST ONE A READ?
CAIN A,IRFRDR ;OR READ REVERSE?
JRST MTSQI6 ;YES, DONT NEED TO UPDATE STATUS
CALL UPDSTS ;UPDATE STATUS
RET ;NEED TO BLOCK
MTSQI6: CALL CHKERI ;SEE IF ANY ERRORS
RET ;YES, DONT GO ANY FURTHER
MOVE A,FILBYN(JFN) ;SEE IF THE BUFFER IS EMPTY YET
CAMGE A,FILLEN(JFN) ;...
JRST MTSQI1 ;NO, JUST STEP TO NEXT PAGE IN BUFFER
JUMPE A,MTSQI5 ;IF NO BUFFER YET, DONT CALL IRBDON
MTSQI0: CALL CLRINP ;CLEAR FILLEN ETC
MTERET () ;ERROR
MTSQI5: LOAD A,MTRS ;GET RECORD SIZE
MOVEI B,IRFRED ;MARK THAT A READ IS BEING DONE
LOAD C,MTRBF ;GET READ BACKWARDS FLAG
SKIPE C ;READING BACKWARDS?
MOVEI B,IRFRDR ;YES, GET CORRECT FUNCTION CODE
CALL MTIRQI ;QUEUE UP ANY FREE IORBS FOR FILLING
RET ;ERROR OCCURED
CALL GETUBF ;GET NEXT IORB TO BE EMPTIED
RET ;MUST WAIT FOR ONE TO FILL UP
JUMPE B,MTSQI0 ;IF NO CHARACTERS IN IORB, GET ANOTHER
OPSTR <IMUL B,>,MTUBW ;CALCULATE USER BYTES IN BUFFER
OPSTR <IDIV B,>,MTHBW ; HDW BYTES * USER BPW / HDW BPW
SKIPE C ;PARTIAL BYTE?
AOS B ;YES, COUNT TOTAL BYTES BY ONE
LOAD C,MTUBB ;GET MAX USER BYTES PER BUFFER
CAMLE B,C ;LIMIT TO MAX BYTES
MOVE B,C ;...
MOVEM B,FILLEN(JFN) ;THIS = # OF BYTES TO BE BIN'D OR SIN'D
SETZM FILBYN(JFN) ;SET BYTE NUMBER TO ZERO
SETZM FILCNT(JFN) ;ZERO COUNT TOO
JE MTRBF,,MTSQI1 ;READING BACKWARDS?
IDIVI B,PGSIZ ;YES, GET NUMBER OF PAGES OF DATA
SKIPE C ;PARTIAL PAGES INCLUDED
AOS B
MOVEI B,-1(B) ;PAGES GO FROM 0 TO N-1
OPSTRM <ADDM B,>,MTCUP ;START AT END OF LIST OF PAGES
;..
;..
MTSQI1: SKIPLE FILCNT(JFN) ;ARE THERE ANY MORE BYTES IN BUFFER
JRST MTSQI2 ;YES
LOAD A,MTCUP ;GET NEXT BUFFER PAGE TO BE EMPTIED
MOVE A,(A) ;GET VIRTUAL ADDRESS OF THE PAGE
OPSTR <HRL A,>,MTBYT ;SET UP BYTE POINTER
MOVEM A,FILBYT(JFN) ;SAVE BYTE POINTER FOR BIN/SIN
MOVE A,FILLEN(JFN) ;GET LENGTH OF BUFFER
SUB A,FILBYN(JFN) ;GET NUMBER OF BYTES LEFT IN BUFFER
LOAD B,MTUBP ;GET NUMBER OF USER BYTES PER PAGE
CAMLE A,B ;IS THERE MORE THAN 1 PAGE OF BYTES
MOVE A,B ;YES, LIMIT COUNT TO 1 PAGE ONLY
MOVEM A,FILCNT(JFN) ;SAVE COUNT OF BYTES IN THIS PAGE
JN MTRBF,,MTSQI3 ;IF READING BACKWARDS, GO FIX UP FILBYT
INCR MTCUP ;STEP TO NEXT PAGE IN BUFFER
MTSQI2: SOS FILCNT(JFN) ;NOW GET THE NEXT BYTE
AOS FILBYN(JFN) ;DECREMENT COUNT AND INCREMENT POSITION
ILDB A,FILBYT(JFN) ;GET BYTE FROM BUFFER
RET ;GIVE SUCCESSFUL RETURN
MTSQI3: DECR MTCUP ;STEP TO NEXT USER PAGE
MOVE C,FILLEN(JFN) ;GET NUMBER OF BYTES ON THIS PAGE
SUB C,FILBYN(JFN) ;GET NUMBER OF BYTES LEFT IN RECORD
IDIV C,B ;DIVIDE BY USER BYTES PER PAGE
JUMPE D,MTSQI2 ;IF ON A PAGE BOUNDRY, USE FULL COUNT
MOVEM D,FILCNT(JFN) ;IF FIRST TIME THRU, USE THIS COUNT
SUB B,D ;GET NUMBER OF BYTES TO SKIP
OPSTR <IDIV B,>,MTUBW ;SPLIT INTO WORDS AND BYTES
ADDM B,FILBYT(JFN) ;STEP OVER THE FULL WORDS
MTSQI4: SOJL C,MTSQI2 ;THEN STEP OVER BYTES (IF ANY)
IBP FILBYT(JFN)
JRST MTSQI4 ;LOOP BACK TIL ALL BYTES SKIPPED
;ROUTINE TO WAIT FOR AN IORB TO GO INACTIVE
;ACCEPTS IN A/ IORB ADR
; JRST MTAWTR
;RETURNS +1: ALWAYS, WITH BLKF SET AND A SET UP FOR MDISMS
MTAWTR: HRLI A,MTARWT ;SET UP FOR DISMIS
MOVSS A
TQO <BLKF> ;MARK THAT ROUTINE WANTS TO BLOCK
RET ;GO BLOCK
;ROUTINE TO WAIT FOR AN IORB TO BECOME READY
RESCD
MTARWT::JN IRBFA,(A),0(4) ;IF STILL ACTIVE, TAKE NON-SKIP RET
JRST 1(4) ;NO LONGER ACTIVE
SWAPCD
;ROUTINE TO CLEAR EOFF AND ABORTF FOR UNIT IN A
MTACEF::MOVX IOS,MT%EOF!MT%EOT ;BITS TO CLEAR
ANDCAB IOS,MTASTS(A) ;CLEAR THEM
TQZ <EOFF,ERRF> ; AND THESE ALSO (IN STS)
SETZRO ABORTF,(A) ; AND THIS
RET ;RETURN
;ROUTINE TO DO SEQUENTIAL OUTPUT
;CALLED FROM IO
MTASQO::STKVAR <MTSQOB>
MOVEM A,MTSQOB ;SAVE THE BYTE
HLRZ U,DEV ;SET UP UNIT
MOVX IOS,MTOWT ;CLEAR MTOPR WAIT FLAG
ANDCAB IOS,MTASTS(U)
CALL CHKERO ;CHECK FOR ERRORS
RET ;THERE ARE SOME, EXIT NOW
CALL MTAASB ;ASSIGN BUFFERS IF NEEDED
MTERET () ;NO ROOM IN JSB FOR BUFFERS
SKIPG FILLEN(JFN) ;IS THIS THE VERY FIRST TIME THROUGH?
JRST [ CALL GETIRB ;GET NEXT IORB TO USE
RET ;WAIT FOR AN IORB
JRST MTSQO2] ;GO USE THIS BUFFER FOR FILLING
MOVE A,FILBYN(JFN) ;GET BYTE COUNT
CAMGE A,FILLEN(JFN) ;ANY BYTES LEFT IN THIS BUFFER?
JRST MTSQO1 ;YES, GO STEP TO NEXT PAGE
CALL MTSQO0 ;GO OUTPUT THE BUFFER
CALL GETIRB ;GET NEXT BUFFER FOR USER TO FILL
RET ;NONE AVAILABLE, GO WAIT FOR A BUFFER
MTSQO2: CALL CHKERO ;CHECK FOR ERRORS
RET ;ERRORS EXIST
LOAD A,MTUBB ;GET USER BYTES PER BUFFER
MOVEM A,FILLEN(JFN) ;SET UP NUMBER OF BYTES TO BE BOUT'ED
SETZM FILBYN(JFN) ;START AT BYTE 0
SETZM FILCNT(JFN) ;GUARANTEE TO SET UP FILCNT
MTSQO1: SKIPLE FILCNT(JFN) ;ANY BYTES LEFT ON THIS PAGE?
JRST MTSQO3 ;YES, GO FINISH OUT THIS PAGE
LOAD A,MTCUP ;GET POINTER TO CURRENT PAGE
INCR MTCUP ;STEP TO NEXT PAGE
MOVE A,(A) ;GET ADDRESS OF BUFFER PAGE
OPSTR <HRL A,>,MTBYT ;SET UP FILBYT
MOVEM A,FILBYT(JFN)
HRLI B,0(A) ;ZERO BUFFER
HRRI B,1(A)
SETZM 0(A)
BLT B,PGSIZ-1(A)
MOVE B,FILLEN(JFN) ;GET LENGTH OF BUFFER
SUB B,FILBYN(JFN) ;GET REMAINING BYTES IN BUFFER
LOAD A,MTUBP ;GET USER BYTES PER PAGE
CAML A,B ;ENOUGH BYTES LEFT IN BUFFER?
MOVE A,B ;NO, SET FILCNT CORRECTLY
MOVEM A,FILCNT(JFN) ;SET UP COUNT OF BYTES TO BE BOUT'ED
MTSQO3: SOS FILCNT(JFN) ;NOW PUT IN THE ORIGINAL BYTE
AOS FILBYN(JFN) ;KEEP THE COUNTS RIGHT
MOVE A,MTSQOB ;GET BACK THE BYTE
IDPB A,FILBYT(JFN) ;PUT THE BYTE INTO THE BUFFER
RET ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO WRITE OUT A PARTIAL BUFFER
; CALL MTRECO
;RETURNS +1: ERROR
; +2: DONE
MTRECO::HLRZ U,DEV ;SET UP UNIT NUMBER
MOVE IOS,MTASTS(U) ;GET STATUS BITS
TQNN <OPNF> ;CHECK OPENED
RETBAD (IOX2) ;NOT (CAN GET HERE ON MTOPR)
TQNE <WRTF> ;OPENED FOR WRITE?
TXNE IOS,OPND ;AND NOT IN DUMP MODE?
RETBAD (IOX9) ;NO, RECORD OUT LEGAL FOR SEQUENTIAL WRITE ONLY
SKIPLE FILLEN(JFN) ;ANY BUFFERS SET UP YET?
SKIPG FILBYN(JFN) ;YES, ANY THING IN THEM YET?
RETSKP ;NO, NOTHING TO DO
CALL MTSQO0 ;OUTPUT THE BUFFER
RETSKP ;ALL DONE
;ROUTINE TO OUTPUT A BUFFER AS SPECIFIED BY FILBYN, FILCNT, AND FILLEN
; CALL MTSQO0
;RETURNS +1: NEEDS TO BLOCK
; +2: BUFFER HAS BEEN QUEUED
MTSQO0: CALL GETCSB ;GET CURRENT IORB BEING USED
LOAD B,MTHBW ;GET RECORD SIZE FOR OUTPUT
LOAD D,MTUBW ;GET USER BYTES PER WORD
IMUL B,FILBYN(JFN) ;BYN * HBW / UBW
IDIV B,D
SKIPE C ;ANY PARTIAL BYTES?
AOS B ;YES, WRITE OUT PARTIAL BYTE
LOAD D,MTHBW ;NOW GET MIN # OF HDW BYTES PER RECORD
IMULI D,MINREC ;GET # OF BYTES IN MIN RECORD
CAMGE B,D ;IS THIS RECORD TOO SMALL?
MOVE B,D ;YES, MAKE IT THE MINIMUM SIZE
MOVEI C,IRFWRT ;FUNCTION IS WRITE
CALL MTAIRQ ;QUEUE UP THIS IORB
SETZM FILLEN(JFN) ;MARK THAT BUFFER WAS QUEUED UP
SETZM FILBYN(JFN)
SETZM FILCNT(JFN)
MOVX C,MT%EOT ;CHECK FOR EOT
TDNN C,MTASTS(U) ;...
RET ;NOT AT EOT
TQO <ERRF> ;SET ERROR FLAG
RET ;WILL BE NOTICED LATER
;ROUTINE TO ASSIGN BUFFER SPACE IN THE JSB
;THIS ROUTINE SETS UP MTBUF, MTCUB, AND MTNBF
;ACCEPTS U/ UNIT #
; CALL MTAASB
;RETURNS +1: NO ROOM IN JSB FOR BUFFERS
; +2: BUFFERS ASSIGNED
MTAASB: MOVX A,BUFA ;BUFFERS ALREADY ASSIGNED?
TDNE A,MTASTS(U) ;...
RETSKP ;YES, NO NEED TO GO ANY FURTHER
SAVEP ;SAVE PERMANENT ACS
LOAD B,MTRS ;GET RECORD SIZE
OPSTR <IDIV B,>,MTHBW ;GET NUMBER OF WORDS PER RECORD
SKIPE C ;[TCO 2066] WAS THERE A REMINDER
AOS B ;[TCO 2066] YES ADD 1 TO THE RESAULT
ADDI B,PGSIZ-1 ;CALCULATE NUMBER OF PAGES REQUIRED
IDIVI B,PGSIZ ;...
CAILE B,MAXPPB ;WITHIN BOUNDS?
RETBAD (MTOX4) ;NO, RECORD SIZE TOO LARGE
STOR B,MTPPB ;SAVE PAGES PER BUFFER
LOAD P5,MTBUF ;SET UP BASE ADR OF LIST
LOAD P3,MTPPB ;SET UP COUNTER
IMULI P3,MTBUFN
MTAAS1: CALL ASGPAG ;GET A PAGE FROM JSB
JRST MTAAS2 ;NO MORE LEFT, GO RELEASE SPACE
HRRZM A,0(P5) ;STORE ADDRESS IN LIST
AOS P5 ;STEP POINTER TO LIST
SOJG P3,MTAAS1 ;LOOP BACK TIL ALL PAGES ASSIGNED
MOVX A,BUFA ;MARK THAT BUFFERS ARE NOW ASSIGNED
IORM A,MTASTS(U) ;...
RETSKP ;BUFFERS ASSIGNED
MTAAS2: LOAD A,MTPPB ;GET MAX NUMBER OF ASSIGNABLE PAGES
IMULI A,MTBUFN ;...
SUB P3,A ;GET NEGATIVE COUNT OF PAGES ASSIGNED
MTAAS3: AOJG P3,MTAAS4 ;ANY MORE PAGES TO BE RELEASED?
MOVE A,-1(P5) ;YES, GET ADDRESS
CALL RELPAG ;AND RELEASE IT
SOJA P5,MTAAS3 ;LOOP BACK TIL ALL PAGES RELEASED
MTAAS4: MOVEI A,IOX7 ;NO ROOM IN JSB FOR BUFFERS
RETBAD ;GIVE FAIL RETURN
;ROUTINE TO RELEASE ALL OF THE BUFFER PAGES
; CALL MTARLB
;RETURNS +1: ALWAYS
MTARLB: MOVX A,BUFA ;ARE THERE ANY BUFFERS ASSIGNED?
TDNN A,MTASTS(U) ;...
RET ;NO, DONT RELEASE ANY
SAVEP
LOAD P3,MTPPB ;GET COUNT OF NUMBER OF PAGES
IMULI P3,MTBUFN ;...
LOAD P5,MTBUF ;GET STARTING ADR OF LIST OF PAGES
MTARL1: HRRZ A,0(P5) ;GET NEXT PAGE TO BE RELEASED
CALL RELPAG ;RELEASE IT
AOS P5 ;STEP POINTER TO LIST
SOJG P3,MTARL1 ;LOOP BACK TIL ALL PAGES RELEASED
MOVX A,BUFA ;NOW MARK THAT THERE ARE NO BUFFERS
ANDCAM A,MTASTS(U) ;...
RET ;AND RETURN
;ROUTINE TO GET AN IORB TO USE AND STEP TO NEXT IORB
; CALL GETIRB
;RETURNS +1: NEED TO WAIT OR ERROR
; +2: A/ IORB ADR
GETIRB: CALL GETCSB ;GET CURRENT IORB ADR
JN IRBFA,(A),MTAWTR ;IF ACTIVE STILL, GO WAIT
JN IRBFF,(A),GETIR1 ;IF FREE, DONT CALL IRBDON
CALL SETSTS ;CHECK FOR ERRORS IN IORB
CALL IRBDON ;MARK IORB AS DONE
RET ;ERROR
GETIR1: LOAD B,MTCSB ;GET BUFFER NUMBER AGAIN
OPSTR <IMUL B,>,MTPPB ;GET OFFSET INTO LIST OF PAGES
OPSTR <ADD B,>,MTBUF ;ADD START ADR OF BUFFER
STOR B,MTCUP ;SAVE CURRENT PAGE BEING EMPTIED
SETONE IRBFQ,(A) ;MARK IT AS QUEUED UP
SETZRO <IRBAB,IRBFF,IRBFR,IRBFA>,(A)
RETSKP ;GIVE OK RETURN
;ROUTINE TO GET THE NEXT BUFFER TO BE GIVEN TO USER ON INPUT
; CALL GETUBF
;RETURNS +1: WAIT OR ERROR
; +2: A/ IORB ADR
; B/ # OF CHARACTERS IN BUFFER
GETUBF: CALL GTUBFA ;GET NEXT USER IORB
JRST GTUBF1 ;NONE AVAILABLE
CALL SETSTS ;SEE IF ANY ERRORS IN THIS IORB
CALL CHKERI ;SEE IF ANY ERRORS OR EOF
JRST [ PUSH P,A ;SAVE ERROR CODE
CALL GETCUB ;GET CURRENT IORB
CALL IRBDON ;RELEASE IT
JFCL
JRST PA1] ;GIVE ERROR RETURN
MOVE B,IRBCNT(A) ;GET # OF BYTES IN RECORD
RETSKP ;GOT ONE
GTUBF1: JUMPE A,[CALL GETCUB ;GET BACK THE IORB ADR
JRST MTAWTR] ;GO WAIT FOR ACTIVE BIT TO GO OFF
SKIPL A ;NONE QUEUED UP?
RETBAD () ;NO, JUST PLAIN ERROR
BUG.(CHK,MTANOI,MAGTAP,HARD,<GETUBF - No queued IORB's for input>,,<
Cause: GTUBFA was called to get the next user IORB for input but none
were queued.
>)
JRST MTASIC ;GO BOMB
;ROUTINE TO GET A BUFFER FOR INPUTING
; CALL GTUBFA
;RETURNS +1: A = 0 ;NEED TO WAIT FOR ACTIVITY TO FINISH
; A = -1 ;NO IORB'S QUEUED UP FOR INPUT
; A POSITIVE ;ERROR CODE
; +2: A/ IORB ADR
GTUBFA: CALL GETCUB ;GET IORB FOR USER TO EMPTY
JN IRBFA,(A),RETZ ;GO WAIT FOR AN IORB
LOAD B,MTCUB ;GET BUFFER NUMBER AGAIN
OPSTR <IMUL B,>,MTPPB ;GET OFFSET INTO LIST OF PAGES
OPSTR <ADD B,>,MTBUF ;ADD START ADR OF BUFFER
STOR B,MTCUP ;SAVE CURRENT PAGE BEING EMPTIED
JN <IRBFF,IRBAB>,(A),GETUB1
LOAD C,ISFCN,(A) ;GET FUNCTION CODE
CAIE C,IRFRDR ;READ BACKWARDS?
CAIN C,IRFRED ;OR READ?
RETSKP ;YES, GIVE THIS BUFFER TO USER
CALL IRBDON ;MARK THIS BUFFER AS DONE
RET ;ERROR OCCURED
GETUB1: JRST RETO ;NONE QUEUED UP
;ROUTINE TO GET CURRENT USER IORB ADR
; CALL GETCUB
;RETURNS +1: ALWAYS, A/ IORB ADR
GETCUB: MOVEI A,MTBUFN
IMULI A,(U) ;GET BUFFER NUMBER FOR THIS UNIT
OPSTR <ADD A,>,MTCUB ;GET RELATIVE BUFFER NUMBER
IMULI A,MTIRBL
ADDI A,MTIRBF ;GET ACTUAL ADR
RET ;AND RETURN
;ROUTINE TO GET CURRENT IORB ADR
; CALL GETCSB
;RETURNS +1: ALWAYS, A/ IORB ADR
GETCSB: MOVEI A,MTBUFN
IMULI A,(U) ;GET BUFFER NUMBER FOR THIS UNIT
OPSTR <ADD A,>,MTCSB ;GET RELATIVE BUFFER NUMBER
IMULI A,MTIRBL
ADDI A,MTIRBF ;GET ACTUAL ADR
RET ;AND RETURN
;ROUTINE TO STEP TO NEXT USER BUFFER
; CALL STPCUB
;RETURNS +1: ALWAYS
STPCUB: LOAD B,MTCUB ;STEP USER BUFFER
AOS B
IDIVI B,MTBUFN ;MODULO NUMBER OF IORBS
STOR C,MTCUB ;SAVE NEW BUFFER NUMBER
RET
;ROUTINE TO CLEAR FILLEN, FILBYN, FILCNT AND AN IORB
CLRINP: SETZM FILLEN(JFN) ;MARK THAT THERE IS NO MORE BUFFER
SETZM FILBYN(JFN) ; IN CASE WE NEED TO BLOCK
SETZM FILCNT(JFN)
CALL GETCUB ;GET ADR OF THE BUFFER BEING USED
CALL IRBDON ;MARK IT DONE
RET ;SOME SORT OF ERROR OCCURED
CALL STPCUB ;STEP TO NEXT USER BUFFER
RETSKP
;ROUTINE TO MARK AN IORB AS DONE
;ACCEPTS IN A/ IORB ADR
; CALL IRBDON
;RETURNS +1: ERROR
; +2: A/ IORB ADR
IRBDON: JE IRBFQ,(A),IRBDN1 ;IF NOT QUEUED UP, ERROR
JN IRBFA,(A),IRBDN2 ;IF STILL ACTIVE, ERROR
SETZM IRBSTS(A) ;INIT THE IORB
SETZM IRBMOD(A)
SETZM IRBXFL(A) ;CLEAR OUT POINTER TO TRANSFER LIST
SETZRO <IRBFQ,IRBFR,IRBAB,IRBFA>,(A)
SETONE IRBFF,(A) ;MARK IT AS FREE
RETSKP ;FINISHED
IRBDN1: BUG.(CHK,MTANOQ,MAGTAP,HARD,<IRBDN1 - IRBDON called for non-queued up IORB>,,<
Cause: IRBDON was called to mark an IORB as done but the IORB was not
queued.
>)
JRST MTASIC
IRBDN2: BUG.(CHK,MTANOA,MAGTAP,HARD,<IRBDN2 - IRBDON called for an active IORB>,,<
Cause: IRBDON was called to mark an IORB as done but the IORB was
currently active. This is a hard error.
>)
MTASIC: MOVX A,MT%DVE ;MAKE THIS BE A HARD ERROR
IORM A,MTASTS(U)
MTERET (IOX8) ;SOFTWARE CONFUSION
;ROUTINE TO QUEUE UP AN IORB
;ACCEPTS IN A/ IORB ADR
; CALL QUEIRB
;RETURNS +1: ALWAYS
QUEIRB: MOVE IOS,MTASTS(U) ;GET STATUS BITS
MOVX C,IS.IER ;SEE IF USER DOESNT WANT ERROR RECOVERY
TXNE IOS,MT%SER ;...
IORM C,IRBSTS(A) ;DONT DO ANY ERROR RECOVERY ACTION
MOVX C,IS.IEL ;USER WANT TO IGNORE ERROR LOGGING?
TXNE IOS,MTIEL ;...
IORM C,IRBSTS(A) ;YES
LOAD B,MTCSB ;GET CURRENT IORB NUMBER
SETONE IRBFA,(A) ;MARK THIS IORB AS ACTIVE
LOAD C,ISFCN,(A) ;GET FUNCTION
LOAD D,MTFCN ;GET LAST FUNCTION
CAIE C,IRFRED ;READING?
JRST [ CAIE C,IRFRDR ;OR READ REVERSE?
JRST QUEIR1 ;NO, UPDATE MTCUB
CAIE D,IRFRDR ;YES, WAS LAST ONE A READ REVERSE TOO?
JRST QUEIR1 ;NO, SET POINTER TO BUFFER
JRST QUEIR2] ;YES, DONT RESET BUFFER POINTER
CAIE D,IRFRED ;LAST ONE A READ?
QUEIR1: STOR B,MTCUB ;NO, SET USER BUFFER POINTER HERE
QUEIR2: STOR C,MTFCN ;SET LAST FUNCTION
AOS B ;NOW STEP IORB NUMBER
IDIVI B,MTBUFN ;MODULO NUMBER OF IORBS
STOR C,MTCSB
INCR MTNIR ;COUNT UP NUMBER OF QUEUED IORBS
MOVE B,MTCUTB(U) ;GET CDB,,UDB
NOSKED ;PHYSIO REQUIRES NOSKED
CALL PHYSIO ;QUEUE UP REQUEST
OKSKED
RET ;RETURN
;ROUTINE TO CHECK AN IORB FOR ERRORS
; CALL CHKERI OR CALL CHKERO
;RETURNS +1: ERROR
; +2: OK, A-D UNCHANGED
CHKERI: MOVE IOS,MTASTS(U) ;GET STATUS BITS
TXNN IOS,MT%EOF!MT%DAE!MT%DVE!MT%IRL
RETSKP ;NO ERRORS OR EOF
JRST CHKER1
CHKERO: MOVE IOS,MTASTS(U) ;GET STATUS BITS
TXNN IOS,MT%DAE!MT%DVE!MT%IRL
RETSKP ;NO ERRORS
CHKER1: MOVEI A,IOX4 ;SET UP FOR EOF ERROR
TXNE IOS,MT%DAE!MT%DVE!MT%IRL ;ANY ERRORS?
SKIPA A,[IOX5] ;YES, GET ERROR CODE
TQOA <EOFF> ;MARK EOF FLAG
TQO <ERRF> ;OR ERROR FLAG
RET ;AND GIVE ERROR RETURN
;ROUTINE TO SET UP THE STATUS WORD
;ACCEPTS IN A/ IORB ADR
; CALL SETSTS
;RETURNS +1: ALWAYS
SETSTS: JN <IRBAB,IRBFF>,(A),R ;ABORTED OR FREE ARE OK
JE IRBFR,(A),R ;IF NEVER QUEUED UP, DONT SET STATUS
MOVE B,IRBSTS(A) ;GET STATUS BITS
MOVX C,MT%EOT!MT%BOT!MT%EOF ;SET UP TO TEST CONDITIONS
ANDCAM C,MTASTS(U) ;CLEAR THESE BITS FIRST
TXNN B,IS.TPM ;EOF SET?
TXZ C,MT%EOF ;NO
TXNN B,IS.EOT ;AT END OF TAPE?
TXZ C,MT%EOT ;NO
TXNN B,IS.BOT ;OR AT BEGINING OF TAPE
TXZ C,MT%BOT ;NO
TXNE B,IS.DTE ;DATA ERROR?
TXO C,MT%DAE ;YES
TXNE B,IS.DVE ;DEVICE (HARDWARE) ERROR?
TXO C,MT%DVE ;YES
TXNE B,IS.RTL ;RECORD TOO LONG?
TXO C,MT%IRL ;YES
IORB C,MTASTS(U) ;SET BITS IN STATUS WORD
LOAD D,ISFCN,(A) ;GET THE FUNCTION
CAIN D,IRFRDR ;READ BACKWARDS?
JRST SETST1 ;YES, CHECK RECORD LENGTH
CAIE D,IRFRED ;READ?
CAIN D,IRFWRT ;OR WRITE?
SETST1: SKIPA D,IRBCNT(A) ;YES, CHECK RECORD LENGTH
JRST SETST2 ;NO, DONT SET MT%IRL
TXNN C,MT%EOF!MT%BOT ;IF NO TRANSFER, DON'T LOSE RECORD SIZE
STOR D,MTALTC ;REMEMBER THIS FOR MTGTS
OPSTR <SUB D,>,IRBOC,(A) ;SUBTRACT ORIGINAL COUNT
TXNE C,OPND ;DUMP MODE?
SKIPN D ;YES, MUST BE 0 ELSE ERROR
JRST SETST2 ;NO RECORD LENGTH ERROR
MOVX C,MT%IRL ;SET UP FOR RECORD LENGTH ERROR
TXNN B,IS.TPM ;SAW A TAPE MARK THIS TIME?
IORB C,MTASTS(U) ;NO, SET MT%IRL IN MTASTS
SETST2: RET ;ALL DONE
;ROUTINE TO CHECK IF AN IORB SHOULD BE ABORTED
;ACCEPTS IN A/ IORB ADR
; CALL MTCHKA ;CALLED FROM PHYTM2
;RTURNS +1: ABORT THE IORB
; +2: OK
RESCD
MTCHKA: LOAD B,IRBUN,(A) ;GET UNIT NUMBER
JE ABORTF,(B),RSKP ;IF ABORT FLAG = 0, GIVE OK RETURN
SETONE IRBAB,(A) ;MARK THAT THE IORB WAS ABORTED
RET ;LET PHYSIO MARK THIS AS DONE
SWAPCD
;ROUTINE TO QUEUE UP IORB'S FOR FILLING
;ACCEPTS IN A/ RECORD SIZE
; B/ FUNCTION CODE
; CALL MTIRQI
;RETURNS +1: ERROR
; +2: SUCCESSFUL
MTIRQI: STKVAR <MTIRQR,MTIRQF>
MOVEM A,MTIRQR ;SAVE THE RECORD SIZE
MOVEM B,MTIRQF ;SAVE FUNCTION CODE
MTIRQ0: CALL GETCSB ;GET ADR OF THIS IORB
JN IRBFA,(A),RSKP ;IF IORB IS STILL ACTIVE, ALL DONE
JN IRBAB,(A),MTIRQ1 ;IF ABORTED, USE THIS IORB
LOAD B,IRBFQ,(A) ;GET QUEUED FLAG
LOAD C,ISFCN,(A) ;GET FUNCTION CODE OF THIS IORB
CAIE C,IRFRDR ;READ BACKWARDS
CAIN C,IRFRED ;OR READ AHEAD?
JUMPN B,RSKP ;YES, CAUGHT UP WITH USER
MTIRQ1: CALL GETIRB ;GET NEXT IORB (SHOULD NOT BLOCK)
RET ;AN ERROR OCCURED
MOVE B,MTIRQR ;GET RECORD SIZE
MOVE C,MTIRQF ;AND FUNCTION CODE
CALL MTAIRQ ;QUEUE UP THIS IORB FOR READING
JRST MTIRQ0 ;LOOP BACK TILL CAUGHT UP WITH EMPTIER
;ROUTINE TO QUEUE 1 IORB FOR FILLING
;ACCEPTS IN A/ ADR OF IORB TO BE USED
; B/ RECORD SIZE
; C/ FUNCTION CODE
; CALL MTIRQ1
;RETURNS +1: ALWAYS
MTAIRQ: STKVAR <MTIRQA,MTIRQB,MTIRQC,MTIRQP,MTIRQT,MTIRQF>
MOVEM A,MTIRQA ;SAVE ADDRESS OF IORB
MOVEM B,MTIRQT ;SAVE SIZE OF RECORD
MOVEM B,IRBCNT(A) ;STORE CHARACTER COUNT
STOR B,IRBOC,(A) ;SAVE ORIGINAL COUNT FOR CHKERR
MOVEM C,MTIRQF ;SAVE FUNCTION FOR LATER
STOR C,ISFCN,(A) ;STORE FUNCTION CODE
ADDI A,MTIRTL ;GET POINTER TO IO LIST AREA
MOVEM A,MTIRQC ;SAVE FOR STORING LIST LATER
LOAD B,MTPPB ;GET PAGES PER BUFFER
MOVEM B,MTIRQP ;SAVE THIS COUNT
OPSTR <IMUL B,>,MTCSB ;THEN GET START OF AREA FOR THIS BUFFER
OPSTR <ADD B,>,MTBUF ;GET ADR OF PAGE TO BE FILLED
MOVEM B,MTIRQB
MOVE A,MTIRQA ;GET IORB ADR AGAIN
STOR B,IRBPB,(A) ;SAVE ADR OF LIST OF PAGES FOR MTAINT
MTIRQ2: HRRZS A,(B) ;ZERO PHYSICAL PAGE IN CASE NOT LOCKED
SKIPG MTIRQT ;ANY MORE BYTES TO BE TRANSFERED?
JRST [ MOVE C,MTIRQC ;NO, GO END TRANSFER LIST
JRST MTIRQ4]
CALL MLKMA ;LOCK DOWN THIS PAGE
MOVE B,MTIRQB ;GET INDEX INTO PAGE LIST AGAIN
HRLM A,(B) ;STORE PHYSICAL PAGE ADDRESS
MOVE B,MTIRQF ;GET FUNCTION
CAIE B,IRFRED ;READING?
CAIN B,IRFRDR ;OR READ REVERSE?
CALL MRKMPG ;YES, MARK THAT PAGE IS MODIFIED
MOVE B,MTIRQB ;GET PAGE NUMBER AGAIN
HLRZ B,(B) ;...
LSH B,PGSFT ;GET ADDRESS FROM PAGE NUMBER
LOAD A,MTHBW ;GET HARDWARE BYTES PER WORD
IMULI A,PGSIZ ;ASK FOR A PAGE TO BE FILLED
CAMLE A,MTIRQT ;ENOUGH BYTES FOR A FULL PAGE?
MOVE A,MTIRQT ;NO, JUST DO THE REMAINDER OF BYTES
SUBM A,MTIRQT ;DECREMENT THE COUNT OF BYTES LEFT
MOVNS MTIRQT ;SUBM DOESNT DO WHAT WAS DESIRED
OPSTR <HRL A,>,MTDM ;GET MODE OF TRANSFER
;..
;..
MOVE D,MTIRQF ;GET FUNCTION AGAIN
CAIE D,IRFRED ;READING?
CAIN D,IRFRDR ;OR READING BACKWARDS
SKIPA ;YES
JRST MTIRQ3 ;NO
JE MTRBF,,MTIRQ3 ;READING BACKWARDS?
TRO B,777 ;START AT END OF THIS PAGE
TXO A,1B0 ;YES, TELL PHYSIO THAT
MTIRQ3: HLRZ C,MTCUTB(U) ;GET CDB FOR THIS UNIT
CALL PHYCCW ;GET IOWD FOR TRANSFER LIST
MOVEM A,@MTIRQC ;SAVE IOWD IN TRANSFER LIST
AOS B,MTIRQB ;STEP TO NEXT PAGE
AOS C,MTIRQC ;STEP POINTER TO IORB TRANSFER LIST
SOSLE MTIRQP ;ANY MORE PAGES TO BE DONE?
JRST MTIRQ2 ;LOOP BACK FOR ALL IOWD'S
MTIRQ4: SKIPLE MTIRQP ;IF USED ALL PAGES IN LIST, DONT SETZM
SETZM 0(C) ;END TRANSFER LIST WITH A ZERO
MOVE A,MTIRQA ;GET POINTER TO IORB
STOR C,IRBTL,(A) ;SAVE POINTER TO TAIL
MOVEI C,MTIRTL(A) ;GET POINTER TO TRANSFER LIST HEAD
STOR C,IRBHD,(A) ;STORE HEAD POINTER
CALL SETMOD ;SET UP MODE WORD
MOVE D,[MTCHKA,,MTAINT] ;NOW SET UP INTERRUPT LEVEL HANDLER ADR
MOVEM D,IRBIVA(A) ;IN IORB
CALLRET QUEIRB ;GO QUEUE UP THE IORB
;ROUTINE TO SET UP MODE WORD IN IORB
;ACCEPTS IN A/ IORB ADR
; CALL SETMOD
;RETURNS +1: ALWAYS - IORB ADR STILL IN A
SETMOD: LOAD D,MTDM ;SET UP DATA MODE
STOR D,IRBDM,(A)
LOAD D,MTDN ;SET UP DENSITY
STOR D,IRBDN,(A)
LOAD D,MTPAR ;AND SET UP PARITY
STOR D,IRBPAR,(A)
RET
;ROUTINE TO MARK THAT IORB IS READY AND UNLOCK BUFFER PAGES
;CALLED AT INTERRUPT LEVEL BY PHYSIO
;ASSUMES IN A/ ADR OF IORB
; CALL MTAINT
;RETURNS +1: ALWAYS
RESCD
MTAINT: LOAD B,IRBFA,(A) ;MAKE SURE THIS IORB IS REALLY ACTIVE
JUMPE B,NOACTV ;IF 0, A FATAL STATE OF CONFUSION
MOVE B,IRBSTS(A) ;GET STATUS BITS FROM IORB
TXNE B,IS.ERR!IS.TPM ;ERROR OR EOF?
JRST MTAINE ;YES, GO FLUSH ALL QUEUED REQUESTS
MTAIN0: CALLRET MTAIND ;NO, GO UNLOCK PAGES AND MARK DONE
MTAINE: TXNN B,IS.TPM!IS.DTE!IS.DVE!IS.WGU!IS.NRT
JRST MTAIN0 ;DONT ABORT FOR NO GOOD REASON
SAVEQ ;GET SOME PERMANENT ACS
LOAD U,IRBUN,(A) ;GET UNIT NUMBER
CALL MTAIND ;UNLOCK PAGES
CALLRET MTAKIL ;KILL ALL IORBS LEFT ON QUEUE
NOACTV: BUG.(HLT,MTARIN,MAGTAP,HARD,<MTAINT - Interrupt received for nonactive IORB>,,<
Cause: A done interrupt occurred for a magtape IORB, and PHYSIO called
one of the routines MTAINT, MTDINT, or MTPINT to handle the done
IORB. However, the indicated IORB was not marked as being active.
>)
SWAPCD
;ROUTINE TO KILL ALL QUEUED UP REQUESTS
RESCD
MTAKIL::STKVAR <MTAKLA>
SETONE ABORTF,(U) ;MARK THAT IORB'S SHOULD BE ABORTED
MOVE A,MTCUTB(U) ;SET UP CDB ,, UDB FOR PHYKIL
CALL PHYKIL ;DEQUEUE ALL IORB'S
MTAKL1: HRRZM A,MTAKLA ;SAVE ADR OF NEXT IORB
JUMPE A,R ;IF NONE, RETURN
HRRZS A ;CLEAR HIGH ORDER BITS
SETONE IRBAB,(A) ;MARK IORB AS BEING ABORTED
HRRZ B,IRBIVA(A) ;GET INTERRUPT LEVEL ROUTINE TO CALL
CALL 0(B) ;CLEAN UP IORB
HRRZ A,@MTAKLA ;GET NEXT IORB
JRST MTAKL1 ;LOOP BACK TIL ALL IORB'S DEQUEUED
SWAPCD
;ROUTINE TO DEQUEUE ONE IORB
RESCD
MTAIND: SAVEQ ;SAVE ALL PERMANENT ACS USED
MOVX B,IRBFR ;MARK THAT BUFFER IS READY
IORM B,MTIRSD(A)
MOVX B,IRBFA ;AND CLEAR ACTIVE BIT
ANDCAM B,MTIRSD(A)
LOAD U,IRBUN,(A) ;GET UNIT NUMBER
LOAD B,MTPPB ;GET COUNT OF PAGES THAT NEED UNLOCKING
MOVNS B ;SET UP FOR AOBJN POINTER
LOAD Q3,IRBPB,(A) ;GET ADDRESS OF LIST OF LOCKED PAGES
HRL Q3,B ;Q3 = -MTPPB ,, ADR OF LOCKED PAGES
MTAIN1: HLRZ A,(Q3) ;GET PHYSICAL ADR OF LOCKED PAGE
JUMPE A,MTAIN2 ;IF AT END OF LOCKED PAGES, STOP
CALL MULKCR ;UNLOCK IT
AOBJN Q3,MTAIN1 ;LOOP BACK TILL ALL PAGES UNLOCKED
MTAIN2: DECR MTNIR ;DECREMENT NUMBER OF REQUESTS PENDING
RET ;AND RETURN
SWAPCD
;JSYS TO SET UP LOGICAL TO PHYSICAL CORRESPONDENCE. ;INPUT IS:
; USER A/ SLAVE,,UNIT NUMBER
; USER B/ SERIAL NUMBER
.MTALN::MCENT
MOVX B,SC%WHL!SC%OPR
TDNN B,CAPENB ;IS THIS A PRIVILEGED JOB?
ITERR (WHELX1) ;NO. COMPLAIN
HRLI A,600002 ;MAGTAPE TYPE
CALL CHKDES ;MAKE SURE IS A VALID UNIT
ITERR() ;CAN'T GET IT
HLRZ U,DEV ;GET UNIT
XCTU [SKIPN B,B] ;A VALID SERIAL #
ITERR () ;NO
XCTU [HLRZ P5,A] ;GET DEVICE TYPE
SKIPN P5 ;IS THERE ONE?
MOVEI P5,.MTT45 ;NO ASSUME 45
JRST MTALNA
RESCD ;MUST BE RESIDENT
MTALNA: IOPIOF ;DISABLE INTERRUPTS
MOVSI P3,-MTAN ;SET UP TO SEARCH ALL UNITS
MTLUN1: SKIPN C,MTCUTB(P3) ;GET UDB ADDRESS FOR THIS UNIT
JRST MTLUN2 ;NONE THERE. FORGET IT
HRRZ D,C ;GET ADDRESS ONLY
CAME B,UDBDSN(D) ;IS THIS THE ONE?
JRST MTLUN2 ;NO. KEEP LOOKING
LOAD P6,USTYP,(D) ;GET TYPE OF SLAVE
CAIE P6,0(P5) ;MATCH?
JRST MTLUN2 ;NOPE TRY NEXT ENTRY
CAIN U,0(P3) ;IS THIS ALREADY CORRECT?
JRST MTALNX ;YES. JUST RETURN GOOD
MOVX B,OPN ;SEE IF UNIT NOW ASSIGNED
TDNN B,MTASTS(U) ;IS THIS ONE BEING USED?
TDNE B,MTASTS(P3) ;IS IT NOW BEING USED?
JRST [ IOPION ;TURN DISKS BACK ON
ITERR (OPNX7)] ;UNAVAILABLE
EXCH C,MTCUTB(U) ;SWITCH ASSIGNMENTS
MOVEM C,MTCUTB(P3) ;DITTO
MTALNX: IOPION ;ENABLE I/O
JRST MRETN ;GOOD
MTLUN2: AOBJN P3,MTLUN1 ;DO ALL UNITS
IOPION ;TURN DISKS ON AGAIN
ITERR(MTNX01) ;NONE FOUND
SWAPCD ;BACK TO SWAPPABLE CODE
;MTOPR JSYS
;ACCEPTS IN B/ OPERATION
; CALL MTMTAP
;RETURNS +1: ROUTINE WANTS TO BLOCK (BLKF SET) OR ERROR
; +2: DONE
MTMTAP::STKVAR <MTMTAO,MTMTAE>
MOVEM T2,MTMTAO ;SAVE OPERATION CODE
HLRZ U,DEV ;SET UP UNIT NUMBER
SKIPL T2 ;LEGAL OPERATION?
CAIL T2,MTMTBL ;LEGAL OPERATION?
RETBAD (MTOX1) ;NO, ERROR
SKIPN T1,MTMTAB(T2) ;GET FLAGS
RETBAD (MTOX1) ;ILLEGAL OPERATION
MOVE IOS,MTASTS(U) ;GET STATUS
TXNE T1,MTONOF ;DON'T NEED OPEN JFN?
JRST MTMTP1 ;SKIP OPEN CHECKS
TXNN IOS,MTOWT ;OK IF NOT FIRST TIME
TXNE IOS,OPN ;OPENED?
SKIPA ;YES
RETBAD (CLSX1) ;FILE NOT OPENED ERROR
TXNE T1,MTNOBF ;BLOCK?
JRST MTMTP1 ;NO DON'T WAIT
MOVX IOS,DMPWT!MTNOWT ;CLEAR THESE FLAGS
ANDCAB IOS,MTASTS(U)
CALL MTACLW ;WAIT FOR ACTIVITY TO STOP
RET ;NEED TO BLOCK
CALL UPDSTS ;UPDATE STATUS
RET ;NEED TO BLOCK
MTMTP1: MOVE T2,MTMTAO ;GET BACK OPERATION CODE
HLRZ T1,MTMTAB(T2) ;GET ROUTINE ADDRESS
CALL 0(T1) ;DO THE OPERATION
TDZA T2,T2 ;ERROR OR WAIT
SETO T2, ;SUCCESSFUL
MOVX T3,MTOWT ;ALWAYS CLEAR WAIT BIT
ANDCAM T3,MTASTS(U)
JUMPN T2,RSKP ;IF SUCCESSFUL, RETURN NOW
TXNE IOS,MTNOWT ;SUPPRESS WAIT BIT?
RET ;YES. RETURN NOW THEN
TQNE <BLKF> ;BLOCKING?
IORM T3,MTASTS(U) ;YES, REMEMBER THIS FOR NEXT PASS
RET
;ROUTINE TO INIT DRIVE STORAGE IF IT IS NOT OPENED
MTNOPN: LOCK MTALCK(U),<CALL LCKTST>
CALL MTOPNX ;INIT DATA BASE
RET ;ERROR , PASS ON
RETSKP ;OK - RETURN
;FLAGS FOR MTOPR OPERATIONS
MTONOF==1B18 ;NOT NECESSARY TO HAVE JFN OPEN
MTNOBF==1B19 ;DON'T BLOCK BEFORE OPERATION (MTONOF IMPLIES)
;TABLE OF MTOPR FUNCTIONS
MTMTAB: MTACLE,,0 ;0 - CLEAR ERRORS
MTAREW,,0 ;1 - REWIND
MTARBK,,0 ;2 - SET READ BACKWARDS
MTATPM,,0 ;3 - WRITE TAPE MARK
MTASDM,,0 ;4 - SET DATA MODE
MTASRS,,0 ;5 - SET RECORD SIZE
MTAFRC,,0 ;6 - FORWARD RECORD
MTABRC,,0 ;7 - BACKWARD RECORD
MTAEOT,,0 ;10 - SKIP TO EOT
MTARWU,,0 ;11 - REWIND AND UNLOAD
MTARDN,,0 ;12 - READ DENSITY
MTAERT,,0 ;13 - ERASE TAPE
MTARDM,,0 ;14 - GET DATA MODE
MTARRS,,0 ;15 - GET REC SIZE
MTAFFL,,0 ;16 - FORWARD FILE
MTABFL,,0 ;17 - BACKWARD FILE
MTASPA,,0 ;20 - SET PARITY
MTARPA,,0 ;21 - READ PARITY
MTANRB,,0 ;22 - GET # OF BYTES LEFT IN RECORD
MTRECO,,0 ;23 - OUTPUT RECORD
MTASDN,,0 ;24 - SET DENSITY
MTAINF,,MTONOF ;25 - GET TAPE INFO
MTARDR,,0 ;26 - READ DIRECTION
MTASID,,MTONOF ;27 - SET REEL ID
MTAIEL,,MTONOF ;30 - INHIBIT ERROR LOGGING
RSKP,,0 ;31 - WAIT NOP
MTALOC,,MTONOF ;32 - ATTACH MT TO MTA
0
0
0
0
MTASTA,,MTONOF ;37 - MAGTAPE DRIVE STATUS
MTAONL,,MTONOF ;40 - ENABLE ON/OFFLINE PSI
0 ;41-42 UNDEFINED
0
MTAREW,,0 ;SAME AS .MOREW (IS .MORVL)
0
0
0
0
0
0
0
MTAIRB,,MTNOBF ;53 - RETURN IORBS (DON'T BLOCK)
MTMTBL==.-MTMTAB ;SIZE OF MTOPR DISPATCH TABLE
;ROUTINE TO CLEAR ERRORS
MTACLE: MOVX A,MT%DVE!MT%DAE!MT%IRL!MT%EOT!MT%EOF
TDNN A,MTASTS(U) ;ANY ERRORS SHOWING?
RETSKP ;NO, DONT CLEAR ABORTF
ANDCAM A,MTASTS(U)
SETZRO ABORTF,(U)
TQZ <ERRF,EOFF> ;CLEAR STS ALSO
RETSKP ;EXIT SUCCESSFULLY
;ROUTINE TO SET OR CLEAR THE READ BACKWARDS FLAG
MTARBK: CALL MTPOS0 ;POSITION TAPE TO WHERE USER EXPECTS IT
RET ;NEED TO BLOCK
UMOVE T1,3 ;GET NEW VALUE
STOR T1,MTRBF ;SAVE NEW SETTING OF FLAG
RETSKP ;EXIT
;ROUTINE TO POSITION TAPE TO WHERE USER THINKS IT SHOULD BE
; CALL MTPOS0
;RETURNS +1: NEEDS TO BLOCK
; +2: DONE
MTPOS0: MOVEI A,0 ;SET UP TO POSITION HEAD CORRECTLY
JE MTRBF,,MTPOS1 ;READING BACKWARDS?
CALLRET MTFRC0 ;NO, MOVE TAPE FORWARD OVER READ AHEAD
MTPOS1: CALLRET MTBRC0 ;BACK UP OVER READ AHEAD
;ROUTINE TO READ THE DIRECTION OF READ TRANSFER
MTARDR: LOAD T1,MTRBF ;GET READ BACKWARDS FLAG
UMOVEM T1,3 ;GIVE IT TO USER
RETSKP
;ROUTINE TO SET DATA MODE
MTASDM: SAVEQ
XCTU [HRRZ Q3,3] ;GET NEW DATA MODE
CAILE Q3,MTMXDM ;LEGAL?
RETBAD (MTOX5) ;NO, ILLEGAL DATA MODE
CALL MTAPBO ;OUTPUT PARTIAL BUFFER IF ANY
RET ;NEEDS TO BLOCK
SKIPN Q3 ;IS THIS 0?
LOAD Q3,JSMTM ;YES, GET JOB DEFAULT
SKIPN Q3 ;IS THAT NOT SET YET?
MOVEI Q3,MTDFDM ;YES, USE SYSTEM DEFAULT
STOR Q3,MTDM ;STORE NEW DATA MODE
CALL MTARLB ;RELEASE ANY BUFFERS
SETZM FILLEN(JFN) ;THROW AWAY ANY DATA IN BUFFERS
SETZM FILBYN(JFN)
SETZM FILCNT(JFN)
CALLRET MTASBW ;SET UP OTHER PARAMETERS BASED ON MODE
;ROUTINE TO READ DATA MODE
MTARDM: LOAD T1,MTDM ;GET DATA MODE
UMOVEM T1,3 ;RETURN IT TO USER
RETSKP ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO SET RECORD SIZE
MTASRS: MOVE IOS,MTASTS(U) ;GET STATUS
TXNE IOS,OPND ;DUMP MODE IN EFFECT?
RETBAD (MTOX3) ;YES, ERROR
TXNE IOS,BUFA ;BUFFERS ASSIGNED YET?
RETBAD(MTOX2) ;YES, RECORD SIZE MUST BE SET BEFORE I/O IS DONE
XCTU [HRRZ T1,3] ;GET NEW SIZE
STOR T1,MTRS ;STORE NEW RECORD SIZE
CALLRET MTASBW ;GO COMPUTE NEW PARAMETERS
;ROUTINE TO READ RECORD SIZE
MTARRS: LOAD T1,MTRS ;GET RECORD SIZE
UMOVEM T1,3 ;RETURN IT TO USER
RETSKP ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO SET REEL I.D.
MTASID: MOVE T1,CAPENB ;CHECK CAPABILITIES
TRNN T1,SC%WHL!SC%OPR ;WHEEL OR OPERATOR?
RETBAD (MTOX7) ;NO, NOT PRIVILEGED TO DO THIS FUNCTION
UMOVE T1,3 ;GET I.D.
HRRZ T2,MTCUTB(U) ;GET UDB ADR
MOVEM T1,UDBVID(T2) ;STORE NEW I.D.
RETSKP
;ROUTINE TO SET ERROR LOGGING FLAG
MTAIEL: MOVX T1,MTIEL ;GET FLAG
ANDCAM T1,MTASTS(U) ;CLEAR IT
XCTU [SKIPE 3] ;USER WANT TO SET IT?
IORM T1,MTASTS(U) ;YES
RETSKP
;ROUTINE TO SET DENSITY
;ENTRY FROM JSYS
MTASDN: XCTU [HRRZ T1,3] ;GET NEW DENSITY
;ENTRY FROM MT TO SET DENSITY FROM VAULE IN REG
MTADNS::CAILE T1,MTMXDN ;LEGAL?
RETBAD (MTOX6) ;NO, ILLEGAL DENSITY
SKIPN T1 ;WANT DEFAULT?
LOAD T1,JSMTD ;YES, GET JOB DEFAULT
SKIPN T1 ;GOT ONE YET?
MOVEI T1,MTDFDN ;NO, USE SYSTEM DEFAULT
STOR T1,MTDN ;STORE IT
RETSKP
;ROUTINE TO READ THE DENSITY
MTARDN: HRRZ T1,MTCUTB(U) ;GET UDB
SKIPGE T1,UDBDDM+0(T1) ;HARDWARE DETERMINED DENSITY SET?
LOAD T1,MTDN ;NO - GET THE USER DENSITY
UMOVEM T1,3 ;RETURN IT TO USER
RETSKP ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO SET PARITY
MTASPA: UMOVE T1,3 ;GET NEW PARITY SETTING
STOR T1,MTPAR ;SAVE IT
RETSKP
;ROUTINE TO READ PARITY SETTING
MTARPA: LOAD T1,MTPAR ;GET PARITY SETTING
UMOVEM T1,3 ;RETURN IT TO USER
RETSKP ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO GET THE NUMBER OF BYTES LEFT IN BUFFER
MTANRB: MOVE IOS,MTASTS(U) ;GET STATUS
TXNE IOS,OPND ;MUST BE SEQUENTIAL I/O MODE
RETBAD (MTOX3) ;THIS FUNCTION NOT LEGAL FOR DUMP MODE
SKIPE T1,FILLEN(JFN) ;ANY BUFFER SET UP
SUB T1,FILBYN(JFN) ;YES, GET NUMBER OF BYTES REMAINING
UMOVEM T1,3 ;RETURN IT TO USER
RETSKP ;AND GIVE SUCCESSFUL RETURN
;ROUTINE TO TELL USER WHETHER A NON-BLOCKING IO REQUEST WILL BLOCK
; RETURNS TO USER
; T3/ 0 - REQUEST WILL NOT BLOCK
; T3/ 1 - REQUEST WILL BLOCK
MTAIRB: OPSTR <SKIPE T1,>,MTNIR ;GET NUMBER OF IORBS AND CHECK FOR BLOCK
MOVEI T1,1 ;IT WILL BLOCK RETURN A ONE
UMOVEM T1,T3 ;GIVE STATUS TO USER
RETSKP ;AND BE SUCCESSFUL
;ROUTINE TO RETURN INFORMATION ABOUT A TAPE
MTAINF: SAVEPQ ;SAVE PERMANENT ACS
UMOVE P3,3 ;GET POINTER TO ARGUMENT BLOCK
HRRZ Q3,MTCUTB(U) ;GET POINTER TO UDB
XCTU [HRRZ P5,0(P3)] ;GET COUNT OF WORDS TO BE RETURNED
CAILE P5,MTIFTL ;TOO MANY?
RETBAD (MTOX8) ;YES, ARGUMENT BLOCK TOO LONG
MOVNS P5
HRLZS P5 ;SET UP AOBJN POINTER
MTAIFL: AOS P3 ;STEP POINTER TO ARGUMENT BLOCK
XCT MTINFT(P5) ;GET NEXT WORD
UMOVEM T1,0(P3) ;STORE IT IN USER'S BLOCK
ERJMP [ RETBAD (MTOX13)]
AOBJN P5,MTAIFL ;LOOP BACK UNTIL DONE
RETSKP
MTINFT: LOAD T1,USTYP,(Q3) ;TAPE TYPE CODE
MOVE T1,UDBVID(Q3) ;TAPE ID
CALL MTASER ;DRIVE SERIAL NUMBER
MOVE T1,UDBRCT(Q3) ;READ OPERATION COUNT
MOVE T1,UDBWCT(Q3) ;WRITE OPERATION COUNT
MOVE T1,UDBPS2(Q3) ;RECORD # WITHIN CURRENT FILE
MOVE T1,UDBPS1(Q3) ;FILE # ON TAPE
MOVE T1,UDBSRE(Q3) ;SOFT READ ERRORS
MOVE T1,UDBSWE(Q3) ;SOFT WRITE ERRORS
MOVE T1,UDBHRE(Q3) ;HARD READ ERRORS
MOVE T1,UDBHWE(Q3) ;HARD WRITE ERRORS
MOVE T1,UDBRED(Q3) ;FRAMES READ
MOVE T1,UDBWRT(Q3) ;FRAMES WRITTEN
CALL MTACHA ;GET CHANNEL #
HRRZ T1,UDBADR(Q3) ;GET CONTROLLER #
HRRZ T1,UDBSLV(Q3) ;GET SLAVE #
MOVE T1,UDBDSH(Q3) ;GET HIGH ORDER DRIVE SERIAL #
MOVE T1,UDBDSN(Q3) ;GET LOW ORDER DRIVE SERIAL #
MTIFTL==.-MTINFT
;ROUTINE TO GET SERIAL # OF UNIT
MTASER: HRRZ B,UDBDSN(Q3) ;GET DRIVE SERIAL #
MOVE C,UDBSLV(Q3) ;GET SLAVE NUMBER
DPB C,[POINT 3,B,17]
MOVE C,UDBADR(Q3) ;GET TM02 NUMBER
DPB C,[POINT 3,B,14]
MOVE A,UDBCDB(Q3) ;GET CHANNEL #
MOVE C,CDBADR(A)
DPB C,[POINT 3,B,11]
MOVE A,B ;RETURN CHAN,CONTRL,UNIT ,, SERIAL #
RET
;ROUTINE TO GET THE CHANNEL NUMBER
MTACHA: MOVE A,UDBCDB(Q3)
MOVE T1,CDBADR(A)
RET
;ROUTINE TO REWIND THE TAPE
MTAREW: CALL MTARWX ;FINISH OUTPUT/CLEAR INPUT
RET ;NEEDS TO BLOCK
CALL GETIRB ;GET AN IORB TO USE
RET ;NEED TO WAIT FOR ONE TO BE FREE
MOVEI B,IRFREW ;GET REWIND FUNCTION CODE
MTARW1: MOVEI C,1 ;DO ONE OPERATION
CALL MTPIRQ ;QUEUE UP THIS REQUEST
RETSKP ;ALL DONE
;ROUTINE TO REWIND AND UNLOAD
MTARWU: CALL MTARWX ;FINISH OUTPUT/CLEAR INPUT
RET ;NEEDS TO BLOCK
HRRZ A,MTCUTB(U) ;SET UP UDB ADDRESS
CALL LOGUNL ;PUT OUT AN UNLOAD STATISTICS ENTRY
CALL GETIRB ;GET AN IORB
RET
MOVEI B,IRFRUN ;SET UP OPERATION CODE
JRST MTARW1 ;GO DO THE OPERATION
;COMMON ROUTINE FOR REWINDS TO FINISH OUTPUT OR CLEAR INPUT
MTARWX: TQNE <OPNF> ;IF NOT OPENED
TXNE IOS,OPND ;DUMP MODE?
RETSKP ;YES - DO NOTHING
TQNN <WRTF> ;WRITING?
JRST MTRWXR ;NO
CALLRET MTAPBO ;YES - DO PARTIAL BUFFER OUTPUT
MTRWXR: SKIPN FILBYN(JFN) ;BUFFER EXIST?
RETSKP ;NO
CALL CLRINP ;YES - CLEAR IT
MTERET() ;ERROR
RETSKP
;ROUTINE TO ERASE GAP
MTAERT: TQNE <OPNF> ;MUST BE OPENED
TQNN <WRTF> ;MUST BE OPENED FOR WRITE
RETBAD (IOX2) ;ILLEGAL WRITE ATTEMPT
CALL MTAPBO ;OUTPUT PARTIAL BUFFER IF ANY
RET ;NEEDS TO BLOCK
CALL GETIRB ;GET AN IORB TO USE
RET
MOVEI B,IRFERG ;GET OPERATION CODE
JRST MTARW1 ;GO DO OPERATION
;ROUTINE TO FORCE OUT ANY PARTIAL BUFFER
; CALL MTAPBO
;RETURNS +1: NEED TO BLOCK
; +2: OK
MTAPBO: CALL MTRECO ;OUTPUT RECORD
JFCL ;NOT DOING SEQUENTIAL OUTPUT
CALLRET UPDSTS ;WAIT FOR IT TO STOP WRITING
;ROUTINE TO SKIP TO END OF TAPE
MTAEOT: MOVE IOS,MTASTS(U) ;GET FLAGS
TXNE IOS,MTOWT ;FIRST TIME THRU?
JRST MTAET1 ;NO
CALL MTABRC ;FIRST TIME, DO A BACKSPACE
RET ;NEED TO BLOCK
MTAET2: SETZRO MTSTC ;SET COUNT OF EOF'S SEEN TO ZERO
CALL MTAFFL ;FORWARD SPACE OVER A FILE
RET ;NEED TO BLOCK
JRST MTAET1 ;GO SEE IF NEXT RECORD IS AN EOF ALSO
MTAET1: CALL UPDSTS ;GET CURRENT STATUS
RET ;NEED TO BLOCK
LOAD A,MTFCN ;GET LAST OPERATION DONE
CAIN A,IRFBSB ;BACKSPACE?
JRST MTAET2 ;YES, GO START SEARCHING FOR EOT
MOVE IOS,MTASTS(U) ;GET STATUS
TXNN IOS,MT%EOF ;AT END OF FILE?
JRST MTAET2 ;NO, GO SKIP A FILE
INCR MTSTC ;STEP STATE CODE
LOAD A,MTSTC ;GET COUNT OF EOF'S SEEN
CAIL A,2 ;LESS THAN 2?
JRST MTAET3 ;NO, FOUND EOT
CALL MTAFRC ;SPACE FORWARD ONE RECORD
RET ;NEED TO BLOCK
JRST MTAET1 ;GO SEE IF ON ANOTHER EOF
MTAET3: CAIE A,2 ;JUST FOUND THE SECOND TAPE MARK?
RETSKP ;NO, MUST BE DONE NOW
CALLRET MTABRC ;YES, BACKSPACE OVER SECOND EOF
;ROUTINE TO SPACE OVER A FILE
MTAFFL: MOVE IOS,MTASTS(U) ;GET THE STATUS
TXNN IOS,MTOWT ;FIRST TIME THRU?
JRST [ CALL MTCNCL ;CANCEL READ AHEAD
JRST [ TXO IOS,MTNOWT ;NO MTOPR WAIT
RETBAD()] ;DONE
JRST MTAFF1] ;TRY FOR ONE TO START
MTAFF0: CALL UPDSTA ;UPDATE THE STATUS WORD
RET ;NEED TO BLOCK
CALL CHKERO ;SEE IF ANY ERRORS OCCURED
RET ;YES, STOP NOW
TXNE IOS,MT%EOF ;HIT A TAPE MARK YET?
RETSKP ;YES, ALL DONE
SKIPA A,[MTSPCN] ;GET MAX # OF RECORDS TO DO AT A TIME
MTAFF1: MOVEI A,1 ;DO 1 RECORD FOR THE FIRST TIME ONLY
CALL MTFRC0 ;GO SPACE FORWARD A BIT
RET ;NEED TO BLOCK
JRST MTAFF0 ;LOOP BACK TIL A TAPE MARK SEEN
;ROUTINE TO SPACE THE TAPE FORWARD ONE RECORD
MTAFRC: MOVEI A,1 ;SPACE FORWARD ONE RECORD
CALLRET MTFRC0 ;DO THE WORK
MTFRC0: STKVAR <MTAFRS>
MOVEM A,MTAFRS ;SAVE THE SPACING COUNT
MOVE IOS,MTASTS(U) ;GET CURRENT STATUS
TQNE <OPNF> ;IF NOT OPENED
TXNE IOS,OPND ;IN DUMP MODE?
JRST MTFRC2 ;YES, JUST GO DO OPERATION
TQNE <WRTF> ;WRITING?
JRST [ CALL MTRECO ;YES, WRITE OUT ANY PARTIAL BUFFERS
RET ;NEED TO BLOCK
JRST MTFRC2] ;GO SPACE
SETZ B, ;SPECIFY THAT DIRECTION IS FORWARD
CALL MTBCNT ;COUNT THE READ AHEAD BUFFERS
RET ;ERROR
MOVEM A,MTAFRS ;SAVE COUNT OF RECORDS TO SPACE OVER
MTFRC2: SKIPG MTAFRS ;ANYTHING TO DO?
RETSKP ;NO
CALL GETIRB ;GET AN IORB TO USE
RET ;NEED TO BLOCK
MOVEI B,IRFFSB ;GET FUNCTION CODE
MOVE C,MTAFRS ;GET COUNT OF RECORDS TO SPACE OVER
CALL MTPIRQ ;DO THE SPACING OPERATION
RETSKP ;ALL DONE
;ROUTINE TO BACKSPACE OVER ONE FILE
MTABFL: MOVE IOS,MTASTS(U) ;GET FLAGS
TXNN IOS,MTOWT ;FIRST TIME THRU?
JRST [ CALL MTCNCL ;CANCEL READ AHEAD
JRST [ TXO IOS,MTNOWT ;NO MTOPR WAIT
RETBAD ()]
JRST MTABF1] ;AND DO BS
MTABF0: CALL UPDSTA ;UPDATE THE STATUS WORD
RET ;NEED TO BLOCK
CALL CHKERO ;SEE IF ANY ERRORS OCCURED
RET ;YES, ABORT THIS
TXNE IOS,MT%EOF!MT%BOT ;HIT TAPE MARK YET?
RETSKP ;YES, ALL DONE
SKIPA A,[MTSPCN] ;GET MAX # OF RECORDS TO DO AT A TIME
MTABF1: MOVEI A,1 ;DO 1 RECORD FOR THE FIRST TIME ONLY
CALL MTBRC0 ;BACKSPACE SOME
RET ;NEED TO BLOCK
JRST MTABF0 ;LOOP BACK TILL EOF HIT
;ROUTINE TO BACKSPACE ONE RECORD
MTABRC: CALL MTCNCL ;CANCEL READ AHEAD
RETBAD () ;BLOCK OR ERROR
MOVEI A,1 ;SET UP TO BACK SPACE ONE RECORD
CALLRET MTBRC0 ;DO IT
MTBRC0: STKVAR <MTABRN>
MOVEM A,MTABRN ;STORE COUNT OF RECORDS TO SPACE OVER
MOVE IOS,MTASTS(U) ;GET STATUS BITS
TQNE <OPNF> ;IF NOT OPENED
TXNE IOS,OPND ;DUMP MODE?
JRST MTBRC2 ;YES, GO DO THE OPERATION DIRECTLY
TQNE <WRTF> ;WRITING?
JRST [ CALL MTRECO ;YES, FORCE OUT THE LAST PARTIAL BUFFER
RET ;NEED TO BLOCK
JRST MTBRC2] ;THEN GO BACKSPACE
SETO B, ;SPECIFY THAT DIRECTION IS BACKWARDS
CALL MTBCNT ;COUNT BUFFERS OF READ AHEAD
RET ;ERROR
MOVEM A,MTABRN ;SAVE COUNT OF RECORDS TO SKIP OVER
MTBRC2: SKIPG MTABRN ;ANYTHING TO DO?
RETSKP ;NO
MOVE IOS,MTASTS(U) ;GET STATUS AGAIN
TXNE IOS,MT%BOT ;AT TAPE MARK ALREADY?
RETSKP ;YES, DONT DO ANYTHING
CALL GETIRB ;GET AN IORB TO USE
RET ;MUST WAIT
MOVEI B,IRFBSB ;SET UP TO DO THE BACKSPACE
MOVE C,MTABRN ;GET COUNT OF RECORDS TO SKIP
CALL MTPIRQ ;GO QUEUE UP THIS REQUEST
RETSKP ;AND EXIT
;SPECIAL ROUTINE USED TO CANCEL READ AHEAD BUFFERS
MTCNCL: SKIPL IOS,MTASTS(U) ;OPEN?
RETSKP ;NO. NOTHING TO DO THEN
TXNE IOS,OPND ;OPEN I DUMP MODE?
RETSKP ;YES. NOTHING TO CANCEL THEN
CALL MTACLW ;WAIT FOR ALL IO TO FINISH
RETBAD () ;MUST BLOCK
CALL MTPOS0 ;DO POSITIONING
RETBAD() ;BLOCK OR ERROR
CALL UPDSTA ;UPDATE STATUS
RETBAD () ;NEED TO WAIT FOR ACTIVITY TO CEASE
MOVX IOS,MT%EOF ;MAKE SURE EOF NOT ON
ANDCAB IOS,MTASTS(U) ;""
RETSKP ;AND DONE
;ROUTINE TO COUNT THE BUFFERS OF READ AHEAD
;ACCEPTS IN A/ THE COUNT OF RECORDS TO SKIP
; B/ 0 = SPACING FORWARD
; -1= SPACING BACKWARDS
; CALL MTBCNT
;RETURNS +1: ERROR
; +2: COUNT OF RECORDS TO SPACE OVER IN AC A
MTBCNT: STKVAR <MTBCTA>
MOVEM A,MTBCTA ;SAVE STARTING COUNT
JE MTRBF,,MTBCT0 ;IF NOT READING BACKWARDS, NOT SPECIAL
SETCA B, ;READING BACKWARDS, COMPLEMENT B
MTBCT0: JUMPN B,MTBCT3 ;GO COUNT BUFFERS
MOVE A,FILLEN(JFN) ;GET CURRENT END OF BUFFER
CAMG A,FILBYN(JFN) ;ANY BYTES LEFT IN BUFFER?
JUMPE A,MTBCT1 ;IF NO BUFFER SET UP, DONT CLEAR IT
CALL CLRINP ;AT END OF BUFFER, CLEAR FILLEN
RET ;ERROR
MTBCT1: SOSGE MTBCTA ;ANYTHING MORE TO DO?
JRST MTBCT2 ;NO
CALL GTUBFA ;GET A BUFFER IF ANY
JRST MTBCT2 ;NONE THERE
CALL SETSTS ;UPDATE THE ERROR AND STATUS WORDS
CALL IRBDON ;JUST THROW THIS AWAY INSTEAD OF SPACING
RET
CALL STPCUB ;DONE WITH THIS IORB
JRST MTBCT1 ;LOOP BACK TILL DONE
MTBCT2: AOS A,MTBCTA ;GET COUNT OF RECORDS TO SKIP
RETSKP ;AND EXIT
MTBCT3: SKIPG FILLEN(JFN) ;ANY BUFFER SET UP?
JRST MTBCT4 ;NO, JUST COUNT QUEUED UP BUFFERS
CALL CLRINP ;YES, CLEAR OUT THE BUFFER IN PROGRESS
RET ;ERROR OCCURED
MTBCT4: CALL GTUBFA ;GET NEXT BUFFER QUEUED UP
JRST [ MOVE A,MTBCTA ;NO MORE, GET COUNT
RETSKP] ;AND RETURN
CALL SETSTS ;UPDATE THE STATUS
MOVX B,IS.BOT ;HIT BOT?
TDNN B,IRBSTS(A) ;IF YES, NO TAPE MOVED SO DONT COUNT UP
AOS MTBCTA ;COUNT UP NUMBER OF RECORDS TO PASS OVER
CALL IRBDON ;MARK THIS BUFFER AS DONE
RET ;ERROR OCCURED
CALL STPCUB ;STEP TO NEXT USER BUFFER
JRST MTBCT4 ;LOOP BACK TIL ALL QUEUED UP IORBS DONE
;ROUTINE TO QUEUE A MTOPR REQUEST
;ACCEPTS IN A/ IORB ADR
; B/ FUNCTION CODE
; C/ COUNT
; CALL MTPIRQ
;RETURNS +1: ALWAYS
MTPIRQ: STOR B,ISFCN,(A) ;SAVE FUNCTION CODE IN IORB ALSO
MOVEM C,IRBCNT(A) ;SAVE COUNT IN IORB
STOR C,IRBOC,(A) ;SAVE ORIGINAL COUNT ALSO
MOVE C,[MTCHKA,,MTPINT] ;NOW SET UP INTERRUPT LEVEL HANDLER ADR
MOVEM C,IRBIVA(A) ;SAVE IT IN IORB
SETZRO MTCIRB ;CLEAR DUMP MODE MEMORY OF IORB
CALL SETMOD ;SET UP DENSITY ETC.
SETZRO ABORTF,(U) ;ALWAYS DO THE OPERATION
CALLRET QUEIRB ;QUEUE UP THE REQUEST
;ROUTINE TO BE CALLED AT INTERRUPT LEVEL WHEN IORB IS DONE
RESCD
MTPINT: LOAD B,IRBFA,(A) ;MAKE SURE THIS IORB IS ACTIVE
JUMPE B,NOACTV ;IF NOT, BUGHLT
MOVX B,IRBFR ;MARK THAT BUFFER IS READY
IORM B,MTIRSD(A)
MOVX B,IRBFA ;AND CLEAR ACTIVE BIT
ANDCAM B,MTIRSD(A)
LOAD B,IRBUN,(A) ;GET UNIT NUMBER
DECR MTANIR,(B) ;COUNT DOWN # OF BUSY IORB'S
RET ;AND EXIT
SWAPCD
;ROUTINE TO WRITE A TAPE MARK
MTATPM: TQNN <OPNF> ;FILE OPENED?
RETBAD (IOX2) ;NO - ERROR
CALL MTAPBO ;OUTPUT PARTIAL BUFFERS IF ANY
RET ;NEED TO BLOCK
LOAD A,MTFCN ;GET LAST FUNCTION
CAIN A,IRFWTM ;TAPE MARK?
JRST MTTPM1 ;YES
SETZRO MTNTM ;NO, SET COUNT TO 0
MTTPM1: CALL GETIRB ;GET AN IORB TO USE
RET ;NEED TO BLOCK
MOVEI B,IRFWTM ;WRITE A TAPE MARK
MOVEI C,1 ;JUST 1
CALL MTPIRQ ;QUEUE IT UP
CALL NTMINC ;INCREMENT # OF TAPE MARKS WRITTEN
RETSKP ;ALL DONE
;ROUTINE TO WRITE N TAPE MARKS
;ACCEPTS IN A/ NUMBER OF TAPE MARKS TO BE WRITTEN
; CALL MTAWTM
;RETURNS +1: NEED TO BLOCK
; +2: DONE
MTAWTM: STKVAR <MTAWTC>
TQNN <WRTF> ;MUST BE OPENED FOR WRITE
RETBAD (IOX2) ;ILLEGAL ATTEMPT TO WRITE
MOVEM A,MTAWTC ;SAVE NUMBER OF TAPE MARKS TO WRITE
LOAD B,MTFCN ;GET LAST FUNCTION TO BE DONE
CAIN B,IRFWTM ;WAS A TAPE MARK JUST WRITTEN?
JRST MTWTM1 ;YES
SETZRO MTNTM ;NO, CLEAR COUNT OF TAPE MARKS WRITTEN
MTWTM1: LOAD B,MTNTM ;GET COUNT OF TAPE MARKS WRITTEN
CAML B,MTAWTC ;WRITTEN ENOUGH YET?
RETSKP ;YES, EXIT
CALL GETIRB ;GET AN IORB TO USE
RET ;NONE AVAILABLE, GO WAIT
MOVEI B,IRFWTM ;GET FUNCTION CODE
MOVEI C,1 ;ONE OPERATION
CALL MTPIRQ ;QUEUE UP REQUEST
CALL NTMINC ;INCREMENT # OF EOF'S WRITTEN
JRST MTWTM1 ;LOOP BACK TIL ALL WRITTEN
;ROUTINE TO INCREMENT # OF TAPE MARKS WRITTEN
NTMINC: LOAD T1,MTNTM ;GET NUMBER OF TAPE MARKS
CAIGE T1,2 ;ONLY COUNT TO 2
AOS T1 ;INCREMENT COUNT
STOR T1,MTNTM ;STORE COUNT
RET
;ROUTINE TO ATTACH AN MTA TO A GIVEN MT
; T2/ ARG ADDRESS
MTALOC: SAVEAC <Q3,P3> ;SAVE WORK REGS
MOVE T1,CAPENB ;GET CAPABILITIES
TXNN T1,SC%WHL!SC%OPR ;*** CHECK FOR TLP INSTEAD ***
RETBAD (MTOX7)
UMOVE T2,3 ;GET USER BLOCK ADDRESS
UMOVE T1,0(T2) ;GET COUNT FROM ARG BLOCK
CAIGE T1,2 ;ENOUGH ROOM?
RETBAD (ARGX04) ;NO.
MOVEI Q3,-1(T1) ;GET COUNT MINUS THE HEADER
MOVE P3,T2 ;GET ADDRESS
UMOVE T1,.MOMTN(P3) ;GET MT #
SETZM T3 ;ASSUME DEFAULT DENSITY
CAIL Q3,.MODNS ;DENSITY GIVEN?
UMOVE T3,.MODNS(P3) ;YES. GET SPECIFIED DENSITY
CAILE T3,MTMXDN ;VALID?
RETBAD (MTOX6) ;NO. ERROR THEN
CAIGE Q3,.MOCVN ;CURRENT VOLUME NUMBER GIVEN?
TDZA T2,T2 ;NO. SAY NONE GIVEN
UMOVE T2,.MOCVN(P3) ;YES. GET IT
CALL SETMTU ;SET CORRESPONDENCE
RETBAD () ;BAD
CAIL Q3,.MONVL ;HAVE VOLUME LABELS TO DECLARE?
JRST [ UMOVE T1,.MOMTN(P3) ;YES. MT UNIT NUMBER
UMOVE T2,.MOAVL(P3) ;GET ADDRESS OF LABELS
UMOVE T3,.MONVL(P3) ;GET # OF LABELS
CALL PUTVOL ;PUT LABELS INTO TAPE'S DATA BASE
RETBAD () ;SOME SORT OF ERROR
JRST .+1] ;PROCEED
SOJLE Q3,RSKP ;IF NO MORE, ALL DONE
UMOVE T1,.MOMTN(P3) ;GET MT UNIT NUMBER AGAIN
UMOVE T2,.MOLBT(P3) ;GET LABEL TYPE
SETZM T3 ;ASSUME NO VOLUME # PRESENT
CAIL Q3,.MOCVN-1 ;VOLUME # PRESENT
UMOVE T3,.MOCVN(P3) ;YES. FETCH IT THEN
SOSL T2 ;A VALID TYPE?
CAILE T2,.LTMAX-1 ;STILL?
RETBAD (ARGX05) ;NO
XCT [ CALL SETVV ;SET VALID VOLUME
CALL SETLBL ;SET LABELED
CALL SETEBD ;SET EBCDIC VOLUME
CALL SETT20](T2) ;SET TOPS20 VOLUME
RETBAD () ;BAD
CAIGE Q3,.MOVSN-1 ;HAVE A VOLUME SET NAME?
RETSKP ;ALL DONE
UMOVE T1,.MOMTN(P3) ;YES. GET MT #
UMOVE T3,.MOVSN(P3) ;AND GET VOLUME SET NAME
CALL SETVSN ;SET IT
RETBAD () ;ERROR
RETSKP ;AND DONE
;ROUTINE TO RETURN CURRENT STATUS OF MTA
;
MTASTA: SAVEP ;SAVE REGISTERS
UMOVE P3,3 ;GET ADDRESS OF ARGUMENT BLOCK
UMOVE T3,0(P3) ;GET SIZE OF BLOCK
ERJMPR [RETBAD ()] ;BAD MEM REF, RETURN IT TO USER
SKIPG T3 ;DOES USER WANT ANY ARGUMENTS?
RETBAD (ARGX04) ;NO, ARGUMENT BLOCK TO SMALL
CALL MTSTGS ;GET STATUS
SETZ T1,0 ;START WITH 0
TXNE T2,UC.200 ;CHECK FOR 200 BPI
TXO T1,SJ%CP2 ;SET 200 BPI
TXNE T2,UC.556 ;556 BPI
TXO T1,SJ%CP5
TXNE T2,UC.800 ;800 BPI
TXO T1,SJ%CP8
TXNE T2,UC.160 ;1600 BPI
TXO T1,SJ%C16
TXNE T2,UC.625 ;6250 BPI
TXO T1,SJ%C62
CAIL T3,.MODDN
UMOVEM T1,.MODDN(P3) ;STORE DENSITIES CAPABLE
SETZ T1,0 ;DO DATA MODES
TXNE T2,UC.CD ;CORE DUMP
TXO T1,SJ%CMC
TXNE T2,UC.6B ;SIXBIT
TXO T1,SJ%CM6
TXNE T2,UC.AA ;ANSI ASCII
TXO T1,SJ%CMA
TXNE T2,UC.IC ;INDUSTRY COMPATABLE
TXO T1,SJ%CM8
TXNE T2,UC.HD ;HIGH DENSITY
TXO T1,SJ%CMH
CAIL T3,.MODDM
UMOVEM T1,.MODDM(P3) ;STORE DATA MODES CAPABLE
SETZ T1,0 ;RESET T1
TXNE T2,UC.7TK ;CHECK FOR 7 TRACK
TXOA T1,SJ%7TR ;YES
TXO T1,SJ%9TR ;NO MUST BE 9 TRACK
CAIL T3,.MOTRK
UMOVEM T1,.MOTRK(P3)
SETZ T1,0 ;RESET T1
TXNE P6,US.OFS ;OFLINE
TXO T1,SJ%OFS
TXNE P6,US.MAI
TXO T1,SJ%MAI ;MAINT MODE
TXNE P6,US.MRQ ;MAINT MODE REQUESTED
TXO T1,SJ%MRQ
TXNE P6,US.BOT ;BOT
TXO T1,SJ%BOT
TXNE P6,US.REW ;REWIND
TXO T1,SJ%REW
TXNE P6,US.WLK ;WRITE LOCK
TXO T1,SJ%WLK
CAIL T3,.MOCST
UMOVEM T1,.MOCST(P3) ;STORE WORD
LDB P6,[POINT USSTYP,P6,USPTYP] ;GET DEVICE TYPE
CAIL T3,.MODVT
UMOVEM P6,.MODVT(P3) ;STORE DEVICE TYPE
RETSKP ;DONE AT LAST
RESCD ;MUST BE RESIDENT CODE
MTSTGS: IOPIOF ;INTERLOCK WITH MTALN TO PREVENT A MESS
HRRZ T2,MTCUTB(U) ;GET UDB POINTER
MOVE P6,UDBSTS(T2) ;GET STATUS WORD
MOVE T2,UDBCHR(T2) ;GET CHARACTERISTICS WORD
IOPION ;ENABLE INTERRUPTS AGAIN
RET
SWAPCD ;SWAPABLE CODE AGAIN
;
; .MOOFL - ENABLE FOR ONLINE/OFFLINE PSI INTERRUPTS
MTAONL: MOVX T1,SC%WHL!SC%OPR!SC%MNT ;CHECK PRIVS
TDNN T1,CAPENB
RETBAD (CAPX2) ;NOT ENOUGH CAPABILITIES
MOVEI T1,1 ;GET OFFSET TO PSI CHANNEL IN ARG BLOCK
CALL GETWRD ;GET PSI CHANNNEL TO ENABLE
RETBAD (MTOX13) ;ARGUMENT BLOCK TOO SMALL
CAIN T2,-1 ;CHECK FOR -1 (CLEAR)
JRST [ SETZM MTPSFK(U) ;CLEAR PSI
RETSKP] ;QUIT
CAIL T2,0 ;CHECK THAT GIVEN PSI CHANNEL IS VALID
CAILE T2,5 ; ASSIGNABLE CHANNEL
JRST [ CAIL T2,^D24 ;CHECK THAT GIVEN PSI CHANNEL IS VALID
CAILE T2,^D35 ; ASSIGNABLE CHANNEL
RETBAD (MTOX14) ;BAD PSI CHANNEL NUMBER GIVEN
JRST .+1] ;PSI CHANNEL OK
HRRM T2,MTPSFK(U) ;SAVE PSI
MOVE T2,FORKX ;GET FORK NUMBER
HRLM T2,MTPSFK(U) ;SAVE FORK NUMBER
RETSKP ;SUCCESS RETURN
;ROUTINE TO KILL ENTRIES IN MTPSFK. IT IS CALLED BY KSELF
MTAKFK::MOVE T1,[-MTAN,,MTPSFK] ;POINTER TO TABLE
MTAFKL: HLRZ T2,0(T1) ;GET FORK #
CAIN 7,0(2) ;CHECK AGAINST TABLE
SETZM 0(T1) ;CLEAR ENTRY
AOBJN T1,MTAFKL ;NEXT ENTRY
RET ;QUIT
;ROUTINES TO DO DUMP MODE IO TO AND FROM MAGTAPE
;CALLED FROM IO AND TAPE
;ACCEPTS IN A/ IOWD
MTDMOX::TDZA B,B ;FLAG FOR EXEC ADDRS
MTDMPO::SETO B, ;FLAG FOR USER ADDRS
TRVAR <MTDMOT,MTDMOF,MTDMAD>
MOVEM B,MTDMAD ;SAVE FOR LATER
MOVEM A,MTDMOT ;SAVE IOWD
SETOM MTDMOF ;MARK THAT A DUMPO WAS DONE
HLRZ U,DEV ;SET UP UNIT NUMBER
MOVE IOS,MTASTS(U) ;GET STATUS BITS
TQNN <WRTF> ;OPENED FOR WRITE?
RETBAD (IOX2) ;NO
CALL CHKERO ;ANY ERRORS?
RET ;YES
JRST MTDMO1 ;ENTER COMMON CODE
MTDMIX::TDZA B,B ;FLAG FOR EXEC ADDRS
MTDMPI::SETO B, ;FLAG FOR USER ADDRS
TRVAR <MTDMOT,MTDMOF,MTDMAD>
MOVEM B,MTDMAD ;SAVE FLAG
MOVEM A,MTDMOT ;SAVE IOWD
SETZM MTDMOF ;MARK THAT A DUMPI WAS DONE
HLRZ U,DEV ;SET UP UNIT NUMBER
TQNN <READF> ;OPENED FOR READ?
RETBAD (IOX1) ;NO
LOAD A,MTFCN ;GET LAST FUNCTION DONE
CAIE A,IRFRED ;LAST ONE A READ?
CAIN A,IRFRDR ;OR READ REVERSE?
JRST MTDMI0 ;YES, DONT NEED TO UPDATE STATUS
CALL UPDSTS ;UPDATE STATUS
RET ;NEED TO BLOCK
MTDMI0: CALL CHKERI ;ANY ERRORS OR EOF?
RET ;YES
MTDMO1: MOVX IOS,MTOWT ;CLEAR MTOPR WAIT FLAG
ANDCAB IOS,MTASTS(U)
TXC IOS,OPN!OPND ;OPENED FOR DUMP MODE
TXCE IOS,OPN!OPND ; AND OPENED?
RETBAD (DUMPX2) ;NO, MUST BE MODE 17 FOR DUMPI/O
TXNE IOS,DMPWT ;IN A DUMP MODE WAIT?
JRST MTDMI1 ;YES, GO SEE IF WAIT IS FINISHED
;..
;..
CALL GETIRB ;GET AN IORB TO USE
RET ;NEED TO WAIT FOR ONE
MOVEI B,IRFRED ;SET FUNCTION
LOAD C,MTRBF ;GET READ BACKWARDS FLAG
SKIPE C ;READING BACKWARDS?
MOVEI B,IRFRDR ;YES, GET CORRECT FUNCTION CODE
SKIPE MTDMOF ;OPENED FOR WRITE
MOVEI B,IRFWRT ;YES, SET WRITE FUNCTION
MOVE C,MTDMOT ;GET THE IOWD
LOAD D,MTCIRB ;GET LAST IORB IN USE
STOR D,MTLIRB ;SAVE IT FOR STATUS CHECK LATER
STOR A,MTCIRB ;SAVE CURRENT IORB ADR
CALL MTDIRQ ;GO BUILD AN IORB AND CALL PHYSIO
RETBAD ;FAILED, GIVE ERROR RETURN
MTDMI1: CALL MTDWAT ;WAIT FOR APPROPRIATE TIME
RET ;ROUTINE WANTS TO BLOCK
LOAD A,MTLIRB ;GET ADR OF LAST IORB
TQNN <NWTF> ;IN NO-WAIT MODE?
LOAD A,MTCIRB ;NO, GET CURRENT IORB
JUMPE A,MTDMI2 ;IF NONE, OK
CALL SETSTS ;SEE IF ANY ERRORS OCCURED
MTDMI2: SKIPE MTDMOF ;WRITING?
JRST [ CALL CHKERO ;YES, CHECK FOR ERRORS
RET ;THERE ARE ERRORS
JRST MTDMI3]
CALL CHKERI ;CHECK FOR ERRORS OR EOF
RET ;TAKE ERROR RETURN
MTDMI3: MOVE IOS,MTASTS(U) ;GET STATUS
SKIPE MTDMOF ;WRITING?
TXNN IOS,MT%EOT ;AND AT EOT?
RETSKP ;NO, ALL DONE
TQO <ERRF> ;SET ERROR
RETBAD (IOX5) ;RETURN ERROR
;ROUTINE TO QUEUE AN IORB FOR PHYSIO
;ACCEPTS IN A/ IORB ADR
; B/ FUNCTION CODE
; C/ IOWD TO BE TRANSFERED (IN CONTEXT OF USER PROGRAM)
; CALL MTDIRQ
;RETURNS +1: ALWAYS
;NOTE: THIS ROUTINE ASSUMES THE EXISTENCE OF THE TRVAR IN
;MTDMPO AND MTDMPI
MTDIRQ: STKVAR <MTDIRA,MTDIRC,MTDIRI,MTDIRM,MTDIRT,MTDIRL,MTDIRF,MTDIRZ>
MOVEM A,MTDIRI ;SAVE IORB ADR
MOVEM B,MTDIRF ;SAVE FUNCTION CODE
HLRO B,C ;GET COUNT
MOVNM B,MTDIRC ;SAVE POSITIVE COUNT
HRRZI C,1(C) ;POINT TO FIRST WORD
SKIPN MTDMAD ;CALLED FROM THE MONITOR?
JRST MTDIR5 ;YES. DON'T APPLY PCS
XSFM B ;GET FLAGS
ANDI B,EXPCS ;GET ONLY PREVIOUS CONTEXT SECTION
HRL C,B ;ADD PCS TO THE ADDRESS
MTDIR5: MOVEM C,MTDIRA ;SAVE ADDRESS OF FIRST WORD
MOVE B,MTDIRA ;NOW CALCULATE NUMBER OF PAGES
ADD B,MTDIRC ;GET END OF USER BUFFER
SOS B ;GET ADR OF LAST WORD REFERENCED
TRZ B,777 ;GET PAGE ADDRESS
TRZ C,777 ; OF START AND END OF BUFFER
SUB B,C ;GET # OF PAGES -1
LSH B,-PGSFT
CAILE B,MAXPPB-1 ;LEGAL LENGTH? (LEAVING ROOM FOR 0 WORD)
RETBAD (DUMPX3) ;NO, NOT ENOUGH ROOM IN IORB FOR IOWD'S
MOVE A,MTDIRF ;GET FUNCTION
CAIE A,IRFRED ;READ?
CAIN A,IRFRDR ;OR READ BACKWARDS?
JRST [ CALL WRPGS ;YES. PRE-WRITE THE PAGES THEN
RETBAD () ;ERROR
JRST .+1] ;PROCEED
MOVE A,MTDIRF ;GET FUNCTION AGAIN
CAIN A,IRFWRT ;WRITE?
JRST [ CALL RDPGS ;YES. PRE-READ THE PAGES THEN
RETBAD () ;ERROR
JRST .+1] ;PROCEED
MOVE A,MTDIRI ;GET IORB ADR
LOAD D,ISFCN,(A) ;GET THE FUNCTION CODE
SKIPE D ;IT SHOULD BE ZERO
BUG.(CHK,MTAORN,MAGTAP,HARD,<MTDIR0 - Magtape IORB overrun>,,<
Cause: MTDIRQ was called to queue an IORB for PHYSIO. The caller provided
an IORB and a function code for the IORB. This BUGCHK indicates
that there was a function code already stored in the IORB. The
function code in the IORB should be zero.
>)
ADDI A,MTIRTL ;GET ADDRESS OF START OF TRANSFER LIST
MOVEM A,MTDIRZ ;SAVE POINTER TO START OF LIST
MOVE D,MTDIRF ;GET FUNCTION
CAIE D,IRFRDR ;READING BACKWARDS?
JRST MTDIR0 ;NO
ADDI A,0(B) ;YES, PUT ENTRIES IN FROM END OF LIST
MTDIR0: MOVEM A,MTDIRL
SKIPN MTDMAD ;EXEC XFER?
JRST [ MOVE B,U ;YES - GET UNIT #
LSH B,1 ; TIMES 2
ADDI B,TLABBP ; INDEX INTO POINTER LIST
JRST MTDR1A]
LOAD B,MTCSB ;GET ADDRESS OF LIST OF LOCKED PAGES
IMULI B,MAXPPB+1 ;USED AT INTERRUPT LEVEL TO UNLOCK
OPSTR <ADD B,>,MTBUF ;GET ABSOLUTE ADR OF LIST
MTDR1A: MOVEM B,MTDIRM ;SAVE FOR LATER
MOVE A,MTDIRI ;GET ADR OF IORB
STOR B,IRBPB,(A) ;STORE LIST ADR IN IORB
LOAD B,MTHBW ;GET BYTES PER WORD
IMUL B,MTDIRC ;GET TOTAL BYTES IN TRANSFER
MOVEM B,IRBCNT(A) ;SET UP COUNT IN IORB
STOR B,IRBOC,(A) ;SAVE COUNT TWICE FOR CHKERR
;..
;..
MTDIR1: SETZM @MTDIRM ;ZERO THIS LIST ELEMENT FIRST
SKIPG MTDIRC ;ANY MORE WORDS TO BE TRANSFERED?
JRST MTDIR3 ;NO, GO POST REQUEST
MOVE B,MTDIRA ;GET ADDRESS OF FIRST WORD
ANDI B,777 ;GET OFFSET IN PAGE
MOVEI C,PGSIZ ;GET NUMBER OF WORDS LEFT ON PAGE
SUB C,B ;...
CAMLE C,MTDIRC ;NOW SEE IF THERE ARE ENOUGH LEFT
MOVE C,MTDIRC ;NO, JUST TRANSFER THE REMAINDER
MOVEM C,MTDIRT ;SAVE COUNT
SUBM C,MTDIRC ;UPDATE THE COUNT
MOVNS MTDIRC ;DO WHAT SUBM DOESNT
MOVE A,MTDIRA ;GET ACTUAL ADDRESS
SKIPE MTDMAD ;SKIP IF EXEC PAGE
TXO A,1B0 ;MARK THIS AS A USER PAGE
CALL MLKMA ;LOCK DOWN THE PAGE
MOVEM A,@MTDIRM ;SAVE PHYSICAL ADDRESS FOR UNLOCKING
MOVE B,MTDIRF ;GET FUNCTION
CAIE B,IRFRED ;READING?
CAIN B,IRFRDR ;OR READ REVERSE?
CALL MRKMPG ;YES, MARK THAT PAGE IS MODIFIED
MOVE B,@MTDIRM ;GET PHYSICAL PAGE FOR PHYCCW
LSH B,PGSFT ;MAKE IT INTO AN ADDRESS
MOVE C,MTDIRA ;GET USER ADDRESS AGAIN
ANDI C,777 ;LOW ORDER BITS ONLY
IOR B,C ;SET STARTING WORD WITHIN PAGE
MOVE C,MTDIRT ;GET COUNT OF WORDS ON THIS PAGE
ADDM C,MTDIRA ;UPDATE THE ADDRESS OF USER BUFFER
LOAD A,MTHBW ;GET # OF HARDWARE BYTES PER WORD
IMUL A,MTDIRT ;GET # OF BYTES TO BE TRANSFERED
OPSTR <HRL A,>,MTDM ;ADD IN MODE OF TRANSFER
MOVE D,MTDIRF ;GET FUNCTION CODE
CAIE D,IRFRDR ;READING BACKWARDS?
JRST MTDIR2 ;NO
ADDI B,-1(C) ;YES, START AT LAST WORD OF BLOCK
TXO A,1B0 ;SET BIT 0 TO INDICATE BACKWARDS
MTDIR2: HLRZ C,MTCUTB(U) ;GET CDB FOR THIS UNIT
CALL PHYCCW ;GET TRANSFER COMMAND
MOVEM A,@MTDIRL ;SAVE COMMAND IN TRANSFER LIST
MOVE D,MTDIRF ;GET FUNCTION
CAIN D,IRFRDR ;READING BACKWARDS?
SOSA MTDIRL ;YES, STEP BACK THROUGH LIST
AOS MTDIRL ;STEP TO NEXT ITEM IN TRANSFER LIST
AOS MTDIRZ ;STEP POINTER TO END OF LIST
AOS MTDIRM ;STEP TO NEXT ITEM IN PAGE LIST
JRST MTDIR1 ;LOOP BACK TILL FINISHED
MTDIR3: MOVE C,MTDIRZ ;GET POINTER TO TAIL OF TRANSFER LIST
SETZM 0(C) ;END WITH A ZERO
MOVE A,MTDIRI ;GET ADR OF IORB
STOR C,IRBTL,(A) ;SAVE ADR OF TAIL IN IORB
MOVEI C,MTIRTL(A) ;GET POINTER TO TRANSFER LIST HEAD
STOR C,IRBHD,(A) ;STORE HEAD POINTER
CALL SETMOD ;SET UP DENSITY, DATA MODE, PARITY
MOVE D,MTDIRF ;GET FUNCTION CODE
STOR D,ISFCN,(A) ;PUT IT IN IORB
MOVE D,[MTCHKA,,MTDINT] ;NOW SET UP INTERRUPT LEVEL HANDLER ADR
MOVEM D,IRBIVA(A) ; IN IORB
CALL QUEIRB ;QUEUE THE IORB
RETSKP ;GIVE OK RETURN
;SUBROUTINE OF MTDIRQ TO PRE-WRITE ALL PAGES FOR DUMP MODE INPUT.
; B/ #PAGES -1
; C/ STARTING PAGE NUMBER
;CLOBBERS ONLY A AND D
;RETURNS: +1 ERROR
; +2 ALL SET
WRPGS: MOVE D,C ;COPY PAGE #
MOVE A,B ;COPY COUNT
SKIPE MTDMAD ;MONITOR OR USER?
SKIPA CX,[XCTU [MOVES 0(D)]] ;USER. GET PROPER INSTRUCTION
MOVE CX,[MOVES 0(D)] ;EXEC.
WRPG0: XCT CX ;MODIFY THE PAGE
ERJMP [RETBAD (DUMPX4)] ;ACCESS ERROR
ADDI D,PGSIZ ;NEXT PAGE
SOJGE A,WRPG0 ;DO THEM ALL
RETSKP ;AND DONE
;SUBROUTINE OF MTDIRQ TO PRE-READ PAGES FOR DUMP MODE OUTPUT
; B/ #PAGES-1
; C/ STARTING PAGE NUMBER
;CLOBBERS A AND D
;RETURNS: +1 ERROR, CODE IN A
; +2 OK
RDPGS: MOVE D,C ;COPY PAGE NUMBER
MOVE A,B ;COPY PAGE COUNT
SKIPE MTDMAD ;CHECK MONITOR OR USER
SKIPA CX,[XCTU [SKIP 0(D)]] ;USER
MOVE CX,[SKIP 0(D)] ;MONITOR, GET PROPER INSTRUCTION
RDPG0: XCT CX ;ACCESS THE PAGE
ERJMP [RETBAD (DUMPX4)] ;REPORT ACCESS ERROR
ADDI D,PGSIZ ;NEXT PAGE
SOJGE A,RDPG0 ;LOOP FOR THEM ALL
RETSKP ;AND DONE
;ROUTINE TO WAIT FOR APPROPRIATE EVENT AFTER QUEUEING IORB
; CALL MTDWAT
;RETURNS +1: ROUTINE WANTS TO BLOCK
; +2: WAITING IS NOT NECESSARY
MTDWAT: LOAD A,MTNIR ;GET NUMBER OF REQUESTS IN QUEUE
JUMPE A,MTDWTR ;IF 0, RETURN IMMEDIATELY
TQNE <NWTF> ;"NO WAIT" MODE?
CAILE A,1 ;YES, WAIT FOR COUNT TO GO TO 1
JRST MTDWT0 ;MUST WAIT
MTDWTR: MOVX IOS,DMPWT ;MARK THAT WAITING IS OVER
ANDCAB IOS,MTASTS(U)
RETSKP ;GIVE SKIP RETURN
MTDWT0: MOVX IOS,DMPWT ;MARK THAT WE ARE WAITING
IORB IOS,MTASTS(U)
MOVEI A,MTAWAT ;GET ADR OF ROUTINE TO DO TEST
TQNE <NWTF> ;IF "NO WAIT" MODE,
MOVEI A,MTDWT1 ; THEN WAIT FOR COUNT TO GO TO 1
HRL A,U ;GET UNIT NUMBER
TQO <BLKF> ;SET BLOCK FLAG
RET ;AND GIVE NON-SKIP RETURN
;ROUTINE TO WAIT FOR COUNT OF REQUESTS TO GO TO 1
RESCD
MTDWT1::LOAD B,MTANIR,(A) ;GET COUNT OF OUTSTANDING REQUESTS
CAILE B,1 ;DOWN TO 1 YET?
JRST 0(4) ;NO
JRST 1(4) ;YES, WAIT IS OVER
SWAPCD
;ROUTINE TO HANDLE AN INTERRUPT FROM END OF A DUMP MODE REQUEST
RESCD
MTDINT: LOAD B,IRBFA,(A) ;MAKE SURE THE IORB IS ACTIVE
JUMPE B,NOACTV ;IF NOT, THEN BUGHLT
MOVE B,IRBCNT(A) ;GET FINAL COUNT
OPSTR <CAME B,>,IRBOC,(A) ;MUST BE THE SAME
JRST MTDIN3 ;NOT. RECORD LENGTH ERROR
MOVE B,IRBSTS(A) ;GET STATUS OF REQUEST
TXNE B,IS.ERR!IS.TPM ;ERROR OR TAPE MARK?
JRST MTDINE ;YES, GO ABORT OTHER IORBS
MTDIN0: CALLRET MTDIND ;NO, GO UNLOCK THIS IORB
MTDINE: TXNN B,IS.WGU!IS.TPM!IS.DTE!IS.DVE!IS.NRT
JRST [ LOAD C,ISFCN,(A) ;GET FUNCTION
CAIN C,IRFWRT ;WRITING?
TXNN B,IS.EOT ;YES, THEN CHECK FOR EOT ALSO
JRST MTDIN0 ;NO, THIS IS NOT AN ERROR
JRST .+1] ;EOT ABORTS FURTHER WRITES
MTDIN3: SAVEQ
LOAD U,IRBUN,(A) ;SET UP UNIT NUMBER FOR MTAKIL
CALL MTDIND ;CLEAN UP THE CURRENT IORB FIRST
CALLRET MTAKIL ;THEN ABORT ALL OTHER IORBS
MTDIND: SAVEQ ;SAVE PERMANENT ACS USED
MOVX B,IRBFR ;MARK THAT BUFFER IS READY
IORM B,MTIRSD(A)
MOVX B,IRBFA ;AND CLEAR ACTIVE BIT
ANDCAM B,MTIRSD(A)
LOAD U,IRBUN,(A) ;GET UNIT NUMBER
LOAD Q3,IRBPB,(A) ;GET POINTER TO LIST OF PAGES TO UNLOCK
HRLI Q3,-MAXPPB ;SET UP AOBJN POINTER
MTDIN1: MOVE A,0(Q3) ;GET PAGE TO UNLOCK
JUMPE A,MTDIN2 ;IF 0, REACHED END OF LIST
CALL MULKCR ;UNLOCK THE PAGE
AOBJN Q3,MTDIN1 ;LOOP BACK FOR ALL PAGES
MTDIN2: DECR MTNIR ;DECREMENT COUNT OF REQUESTS IN QUEUE
RET ;AND RETURN
SWAPCD
TNXEND
END