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There are 16 other files named impanx.mac in the archive. Click here to see a list.
; Edit= 8892 to IMPANX.MAC on 12-Aug-88 by RASPUZZI
;This time really update thge BUG. documentation.
; UPD ID= 8525, RIP:<7.MONITOR>IMPANX.MAC.5, 9-Feb-88 16:15:02 by GSCOTT
;TCO 7.1218 - Update copyright date.
; UPD ID= 8414, RIP:<7.MONITOR>IMPANX.MAC.4, 4-Feb-88 12:09:56 by GSCOTT
;TCO 7.1210 - Set ANIOPF and IMINX1 normally not dumpable.
; UPD ID= 2082, SNARK:<6.1.MONITOR>IMPANX.MAC.8, 3-Jun-85 14:41:47 by MCCOLLUM
;TCO 6.1.1406 - Update copyright notice.
; UPD ID= 1945, SNARK:<6.1.MONITOR>IMPANX.MAC.7, 9-May-85 17:07:57 by MCCOLLUM
;TCO 6.1.1238 - Fix more BUG. documentation
; UPD ID= 1607, SNARK:<6.1.MONITOR>IMPANX.MAC.6, 8-Mar-85 11:53:46 by PAETZOLD
;Document BUGxxx's
; UPD ID= 1571, SNARK:<6.1.MONITOR>IMPANX.MAC.5, 26-Feb-85 17:17:41 by PAETZOLD
;Document BUGxxx's
; UPD ID= 1032, SNARK:<6.1.MONITOR>IMPANX.MAC.4, 12-Nov-84 15:23:41 by PAETZOLD
;TCO 6.1041 - Move ARPANET to XCDSEC
; UPD ID= 283, SNARK:<TCPIP.5.4.MONITOR>IMPANX.MAC.3, 24-Sep-84 13:53:37 by PURRETTA
;Update copyright notice.
; UPD ID= 171, SNARK:<TCPIP.5.4.MONITOR>IMPANX.MAC.2, 9-Jun-84 11:29:39 by PAETZOLD
;No more LLINK.
; UPD ID= 3898, SNARK:<6.MONITOR>IMPANX.MAC.8, 11-Mar-84 10:37:54 by PAETZOLD
;More TCO 6.1733 - Guard against higher priority PIs (like the KLNI) in INETIN.
; UPD ID= 3830, SNARK:<6.MONITOR>IMPANX.MAC.7, 29-Feb-84 18:18:13 by PAETZOLD
;More TCO 6.1733 - ANBSEC and MNTSEC removal. Bug Fixes. Cleanup.
;<TCPIP.5.3.MONITOR>IMPANX.MAC.5, 6-Dec-83 23:50:34, Edit by PAETZOLD
;No more NTPRIO stuff. No more 36 bit packing mode. Move BADIFL and IMPIBF
;to IMPANX from IMPDV.
;TCO 6.1866 - Rewrite the IOPGF detection code
;More TCO 6.1733 - NCPFRK has gone away
;<TCPIP.5.1.MONITOR>IMPANX.MAC.8, 5-Jul-83 08:24:56, Edit by PAETZOLD
;Changes for 5.1. Remove NCP support.
; COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1984, 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,ANAUNV
TTITLE (IMPANX,IMPANX,<- AN20 Device Driver>)
Subttl Table of Contents
; Table of Contents for IMPANX
;
; Section Page
;
;
; 1. Definitions for AN20 . . . . . . . . . . . . . . . . . 3
; 2. Start Input . . . . . . . . . . . . . . . . . . . . . 4
; 3. PI Service for Input - First Level . . . . . . . . . . 5
; 4. PI Service for Input - Second Level . . . . . . . . . 7
; 5. PI Service for Input - Third Level . . . . . . . . . . 8
; 6. Internet Input Service . . . . . . . . . . . . . . . . 10
; 7. PI Service for Input - Fourth Level . . . . . . . . . 13
; 8. PI Service for Output - Startup and First Level . . . 14
; 9. PI Service for Output - More Fill and 1822 Leader . . 18
; 10. PI Service for Output - Send Remaining Data . . . . . 19
; 11. Build Host to IMP Going Down Message . . . . . . . . . 20
; 12. PI Service for Output - Output Done Interrupt . . . . 21
; 13. ANXSCK - Check State of Interface . . . . . . . . . . 22
; 14. ANXKIL - Shut Down an AN20 . . . . . . . . . . . . . . 23
; 15. PI Service Initialization . . . . . . . . . . . . . . 24
; 16. ANXRSS - Set AN20 Online If IMP Online . . . . . . . . 25
; 17. IMPFPF - Handle Possible AN20 Induced IOPGFs . . . . . 26
; 18. End of IMPANX . . . . . . . . . . . . . . . . . . . . 27
SUBTTL Definitions for AN20
ANI==:520
ANO==:524
;BITS IN CONI FOR ANI
ANIMRQ==1B27 ;MSG REQUEST. IMP STARTING TO SEND TO HOST.
ANIBSY==1B26 ;BUSY. HOST IS ACCEPTING A MESSAGE
ANIM36==1B25 ;MESSAGE ASSEMBLED INTO 36 BIT WDS IF 1, 32 BIT WORDS IF 0.
ANIDON==1B23 ;DONE. IMP SENT LAST BIT.
ANIIID==1B19 ;IMP IS DOWN. (READY LINE OFF)
ANIIWD==1B18 ;IMP WAS DOWN. (READY LINE HAS BEEN OFF)
;BITS IN CONO FOR ANI
ANIRST==1B19 ;RESET THE WHOLE AN10 (EXCEPT HOST READY LINE)
ANICLE==1B18 ;CLEAR ERROR FLAGS IN LH OF CONI, CLR IMP WAS DOWN.
ANXCHS==<IMPCHN>B32+<IMPCHN>B35;TWO ADJACENT PI CHANNELS IN B30-35
;BITS IN CONI FOR ANO
ANOEND==1B27 ;END OF MSG. SEND "LAST" WHEN WD CNT RUNS OUT.
ANOBSY==1B26 ;BUSY. SEND WORDS TO THE IMP.
ANOM36==1B25 ;MODE 36. SEND ALL 36 BITS OF DATA WORDS. ELSE, JUST SEND LEFT-HAND 32 BITS.
ANODON==1B23 ;ALL BITS INCLUDING "LAST" HAVE BEEN SENT.
;BITS IN CONO FOR ANO
ANOCLE==1B18 ;CLEAR ERROR BITS, IMP WAS DOWN BIT.
;register select field, in both ANO and ANI CONO's note these aren't
;used much because hardware switches to the "right" register most of
;the time by itself.
ANXVAR==2B29 ;VECTOR INTERRUPT ADDRESS REGISTER
ANXWAR==1B29 ;WORD COUNT AND ADDRESS REGISTER
;BITS IN INPUT DEVICE VECTOR ADDRESS REGISTER
ANIHRL==1B10 ;HOST READY LINE. DATAO A 1 TO BECOME READY.
;MISCELLANEOUS VARIABLES
DEFSTR IMWDCT,,12,12 ;WORD COUNT FOR WC/ADR REGISTER
;Device-dependent data for leaders
STY%NP==5 ;Number of Padding words, for H2I NOP
SUBTTL Start Input
XRESCD ; THIS CODE IS RESIDENT
;Called from process level when buffers made available and input is
;off and from endin processor if more buffers are available. P1
;contains pointer to NCT.
ANISRT::CALL ANXSCK ;IS THE IMP UP?
RET ;NO, SO CAN'T USE IT
PIOFF
SKIPE NTIB(P1) ;ALREADY DOING INPUT?
SOSA IMPNFI ;YES, SO DON'T DO ANOTHER
SOSGE IMPNFI ;NO. IS THERE A BUFFER TO READ INTO?
JRST ANISR2 ;NO BUFFER
MOVE T2,IMPFRI ;THERE ARE SOME, IT SAYS. GRAB ONE.
LOAD T1,NBQUE,(T2) ;GET NEXT FREE BUFFER
SKIPE T1 ;IF THERE'S A SUCCESSOR,
SETSEC T1,INTSEC ;SET SECTION NUMBER
MOVEM T1,IMPFRI
SETZRO NBQUE,(T2) ;DEQUEUE IT FROM ANY OTHERS
MOVEM T2,NTIB(P1) ;SAVE AS INPUT BUFFER
HRRZS NTBFFL(P1) ;REMEMBER NTIB IS AN NCP BUFFER
XMOVEI T1,.NBLD0(T2) ;FIRST WORD TO READ INTO
TXO T1,<<.NBLD2+1>B12> ;READ THRU LEADER AND SOME PADDING
MOVEM T1,NTINP(P1) ;THIS IS THE FIRST DATAO TO ANXWAR
XMOVEI T1,IMIN0 ;SET STATE TO "WAITING FOR IMP TO GO"
MOVEM T1,NTIDSP(P1) ;IN INPUT DISPATCH WORD
PION
MOVEI T1,ANICLE+ANXWAR+ANXCHS ;TELL IMP WE ARE READY TO GO.
MNTXCT NTCONO ;DO I/O INSTRUCTION
RET ;IT WILL INTERRUPT ON FIRST BIT TO US
ANISR2: ;HERE WHEN NO INPUT BUFFERS
AOSN IMPNFI ;IF NOT, CORRECT COUNT AND GIVE UP.
SETOM NOIBFS ;FLAG THAT FAILED IF NO BUFFERS
PION
RET
SUBTTL PI Service for Input - First Level
;All ACs have been saved by startup routine, we are dispatched to via
;the NTIDSP word of the proper NCT. If ANIDON is on, they go to
;IMPEI0 for end of input handling. For subsequent interrupts, a field
;will steer the packing and counts. Values are named .IIxxx for Imp
;Interrupt dispatch. Store in NTITYP(NCT) for input and similarly in
;NTOTYP for output.
;The following AC usage conventions are adhered to
;T1 Temp - used to hold I/O instruction arguments
;T2 Points to Buffer if we're working on one
;T3,T4,CX Temp
;P - Hold stack pointer
.IINC2==0 ;This is a 32 bit 1822 message
.IISPQ==1 ;Special queue
.IIINT==2 ;Internet packing
.IISQ2==3 ;False start on Internet -- Handle as spec. Q.
;Here when input has been idle and IMP starts to send bits. This first
;interrupt requires us to send over word count and address. The first
;count will read the IMP-to-host leader and a word of padding, in 36
;bit mode.
IMIN0: MOVEI T1,ANIMRQ ;MESSAGE REQUEST IS ONLY VALID BIT
MNTXCT NTCNSO ;CHECK IF ON
JRST IMIN0X ;IT WASN'T THAT. SOMETHING WIERD.
XMOVEI T1,IMIN1 ;NEXT INTERRUPT WANTED IS THIS
MOVEM T1,NTIDSP(P1) ;SET DISPATCH FOR READING I-H LEADER.
MOVE T1,NTINP(P1) ;GET POINTER
MNTXCT NTDATO ;TELL THE IMP
MOVEI T1,ANIM36+ANIBSY+ANXCHS ;SET TO READ 36 BITS, THEN PI.
MNTXCT NTCONO ;..
RET ;AND RETURN TO CALLER
;IMIN0X - Input interrupt error routine.
;If the input side of the ANX has been idle, any interrupt other than
;MSG REQUEST is an error.
IMIN0X: MNTXCT NTCONI ;GET STATUS FOR BUGINF
BUG.(INF,IMINX1,IMPANX,HARD,<Unusual ANI interrupt>,<<T1,D>>,<
Cause: The monitor received an interrupt from the input side of the AN20
when it was supposed to be idle. This may indicate a hardware
problem with the AN20.
Data: D - CONI ANI
>,,<DB%NND>) ;[7.1210]
MOVEI T1,0
MNTXCT NTCONO ;TURN OFF INPUT
MOVEI T1,ANIRST ;AND GET BITS TO
MNTXCT NTCONO ;RESET ANI, LEAVE ANIIWD ON, INPUT OFF
RET ;BACK TO RESTORE
SUBTTL PI Service for Input - Second Level
;Here at PI level after IMP leader and a word of padding have been
;read. ANIDON on means it wasn't that long.
IMIN1: MOVEI T1,ANIDON ;END OF MESSAGE?
MNTXCT NTCNSZ ;?
JRST IMPEI0 ;YES, GO PROCESS SHORT (IRREG) MSG
MOVE T2,NTIB(P1) ;POINT TO THE INPUT BUFFER
LOAD T1,IHLNK,(T2) ;GET THE LINK AND HOST NUMBERS
LOAD T3,IHHST,(T2) ;GET FULL HOST
CAIN T1,INTLNK ;INTERNET LINK?
SKIPA T4,[.IIINT] ;YES.
MOVX T4,.IISPQ ;SPECIAL QUEUES
XMOVEI T1,.NBLD2+2(T2) ;WHERE NEXT WORD IN GOES.
IOR T1,II1WCT(T4) ;WORD COUNT
MOVEM T1,NTINP(P1) ;COMMAND FOR DEVICE
MNTXCT NTDATO ;DO DATAO T1
MOVEI T1,@II1CNO(T4) ;GET PROPER BITS
MNTXCT NTCONO ;AND MAKE IT GO
XMOVEI T3,IMIN2 ;ADDRESS FOR NEXT INTERRUPT
MOVEM T3,NTIDSP(P1) ;SAVE FOR NEXT INTERRUPT
MOVEM T4,NTITYP(P1) ;SAVE DISPATCH CODE
RET ;AND DONE WITH THIS INTERRUPT
II1WCT: EXP 2B12 ;TYPE NCP32
EXP 1B12 ;TYPE SPECIAL Q
EXP 4B12 ;TYPE INTERNET
EXP 2B12 ;SHOULD NOT BE REFERENCED HERE
II1CNO: EXP ANIM36+ANIBSY+ANXCHS ;TYPE NCP32
EXP ANIBSY+ANXCHS ;TYPE SPECIAL Q
EXP ANIBSY+ANXCHS ;TYPE INTERNET
EXP ANIM36+ANIBSY+ANXCHS ;SHOULD NOT BE REFERENCED HERE
SUBTTL PI Service for Input - Third Level
IMIN2: MOVEI T1,ANIDON ;END OF MESSAGE YET?
MNTXCT NTCNSZ ;?
JRST IMPEI0 ;YES. GO PROCESS SHORT MESSAGE
MOVE T2,NTIB(P1) ;POINT TO THE INPUT BUFFER
;Padding removal isn't needed if haven't read that much, but it's
;cheaper to always remove it than to test for needing to.
DMOVE T3,.NBLD2+2(T2) ;CRUNCH OUT THE PADDING ON INPUT
STOR T3,IHPD1,(T2) ;MOVE THIS PARTIAL WORD
MOVEM T4,.NBHHL(T2) ; ..
MOVE T4,NTITYP(P1) ;GET TYPE CODE FOR THIS MESSAGE
CAIE T4,.IIINT ;INPUTTING POSSIBLE INTERNET MSG?
JRST IMIN2B ;NO
MOVE T1,T2 ;PLACE BUFFER IN REG FOR ROUTINE
CALL INETIN ;CHECK FURTHER. MAY CHANGE T4,T1.
MOVE T2,T1 ;RESTORE
IMIN2B: LOAD T1,NBBSZ,(T2) ;GET ITS SIZE
MOVE T3,II2LDT(T4) ;AMOUNT WE HAVE USED SO FAR
SUBI T1,(T3) ;..
ASH T1,^D23 ;POSITION FOR AN10 WORD COUNTER
IOR T1,T2 ;ADDRESS OF THE BUFFER
ADDI T1,(T3) ;NEXT WORD TO WRITE
MOVEM T1,NTINP(P1) ;FEED THIS TO THE HARDWARE
MNTXCT NTDATO ;TELL IT
MOVEI T1,@II2CNO(T4) ;MAKE IT GO
MNTXCT NTCONO ;..
XMOVEI T1,IMIN3 ;SET DISPATCH FOR NEXT INTERRUPT
MOVEM T1,NTIDSP(P1) ;..
RET ;RESTORE ACS AND DISMISS
;Table of CONO values to read data portion of message, by msg type
II2CNO: EXP ANIBSY+ANXCHS ;TYPE NCP32
EXP ANIBSY+ANXCHS ;TYPE SPECIAL Q
EXP ANIBSY+ANXCHS ;TYPE INTERNET
EXP ANIBSY+ANXCHS ;TYPE SPECIAL Q - FALSE INTERNET
;Table of next word to read into at IMIN2 time, by message type
II2LDT: EXP .NBDW0 ;TYPE NCP32
EXP .NBHHL ;TYPE SPECIAL QUEUES
EXP .NBHHL+3 ;TYPE INTERNET
EXP .NBHHL+3 ;TYPE SPECIAL Q - FALSE INTERNET
SUBTTL Internet Input Service
;Called from IMIN2 when possible Internet message is coming in. This
;routine does the following:
;
; 1. Move the 2 remaining H-H words to the right place
; 2. Check for right message type and subtype
; 3. Check for right Internet message type
; 4. Check for a Internet-supplied buffer being available
;
;If any of those conditions is lacking, input is resumed and the
;message is handled as a normal special queue message. Correction: To
;avoid waking the NCP it is flushed If the message is really destined
;for the gateway (TCP, XNET, ...), it gets copied into a
;Internet-supplied buffer and input resumes. IMPEIN will then queue it
;for the gateway.
;
; T1/ Pointer to current NCP-supplied buffer
; T4/ .IIINT
; CALL INETIN
; Ret+1: Always. T4 still .IIINT if I.N. msg to be completed, or .IISQ2
; if it will be given to a special Q. NTITYP adjusted.
INETIN: STKVAR <INTFR>
DMOVE T2,.NBDW0+2(T1) ;PICK UP THE INTERNET HEADER
DMOVEM T2,.NBDW0(T1) ;STASH IN PROPER PLACE
LOAD T2,IHFTY,(T1) ;ARPANET MESSAGE FORMAT
LOAD T3,IHMTY,(T1) ;ARPANET MESSAGE TYPE
CAIN T3,.IHREG ;REGULAR MSG?
CAIE T2,ITY%LL ;LONG LEADER?
JRST INETIC ;NO. LET NORMAL CODE HANDLE IT.
LOAD T2,IHSTY,(T1) ;ARPANET SUBTYPE
LOAD T3,INPVR,(T1) ;INET PACKET VERSION FLAG (PART OF 2.5 NET)
CAIE T2,STY%FC ;NORMAL, FLOW-CONTROLLED?
CAIN T2,STY%UC ;OR UNCONTROLLED?
CAIE T3,.INTVR ;AND RIGHT INTERNET VERSION?
JRST INETIC ;NO. LET NORMAL CODE HANDLE THIS.
PIOFF ;GUARD AGAINST HIGHER PRIORITY PI'S
SOSL INTNFI ;IS THERE AN INTERNET BUFFER AROUND?
IFSKP.
AOS INTNFI ;NO, COUNT IT BACK
PION ;HIGHER PRIORITY PI'S OKAY NOW
JRST INETIC ;LET NORMAL SPECIAL QUEUE HAVE IT
ENDIF.
SKIPN T3,INTFRI ;GET POINTER TO BUFFER TO USE
BUG.(HLT,IMPIBF,IMPANX,SOFT,<Internet buffers fouled>,<<T3,D>>,<
Cause: The monitor was trying to obtain an internet buffer and none were
available. This is a problem because the available buffer count
was non-zero.
Data: D - Pointer to buffer
>)
LOAD T2,NBQUE,(T3) ;GET NEXT INTERNET FREE BUFFER IF ANY
IFN. T2 ;WAS THERE SOMETHING THERE?
SETZRO NBQUE,(T3) ;YES, CLEAR LIST POINTER
SETSEC T2,INTSEC ;YES SO SET THE SECTION NUMBER
ENDIF.
MOVEM T2,INTFRI ;BECOMES HEAD OF LIST
PION ;ALLOW INTERRUPTS AGAIN
MOVEM T3,INTFR ;SAVE THE BUFFER ADDRESS
XMOVEI T2,.NBLD0(T1) ;"FROM" POINTER FOR BLT
XMOVEI T3,.NBLD0(T3) ;"TO" -- INTO INTERNET
LOAD T1,IMWDCT,II1WCT(T4);GET SIZE OF SECOND TRANSFER
ADDI T1,.NBHHL-2 ;COMPUTE COUNT (-2 FOR FILL CRUNCH)
CALL XBLTA ;COPY ARPANET AND INTERNET HEADERS
MOVE T1,INTFR ;GET BACK THE BUFFER ADDRESS
EXCH T1,NTIB(P1) ;OLD HEAD IS NOW CURRENT INPUT BFR
EXCH T1,IMPFRI ;OLD INPUT BFR GOES TO NCP FREE LIST
MOVE T2,IMPFRI ;GET COPY FOR INDEXING
STOR T1,NBQUE,(T2) ;OLD LIST IS OFF OF NEW HEAD
AOS IMPNFI ;THERE IS NOW ANOTHER FREE INPUT BFR
HRROS NTBFFL(P1) ;THE CURRENT ONE IS OWNED BY INTERNET
MOVE T1,NTIB(P1) ;NOW THINK IN TERMS OF INTERNET BUFFER
RET
;Here when current input is to be continued. Fix to be spec. q. input.
INETIC: SETOM NTFLS(P1) ;MARK TO FLUSH MESSAGE WHEN COMPLETE
MOVEI T2,.IISPQ ;MARK FOR SPECIAL QUEUE DISPATCH
MOVEM T2,NTITYP(P1) ;ON NEXT INTERRUPT
MOVEI T4,.IISQ2 ;RETURN THIS TO CALLER
RET
SUBTTL PI Service for Input - Fourth Level
;Here on interrupt level for body of message from imp.
IMIN3: MOVEI T1,ANIDON ;I HOPE IT FIT IN A BUFFER
MNTXCT NTCNSZ ;..?
JRST IMPEI0 ;GOOD. IT DID.
SETOM NTFLS(P1) ;FLAG TO FLUSH MESSAGE
MOVE T1,[1B12+IMSTK+NIMSTK-1] ;USE STACK AS BIT BUCKET
MNTXCT NTDATO ;...
MOVEI T1,ANIBSY+ANXCHS ;GET BITS
MNTXCT NTCONO ;KEEP READING UNTIL END COMES ALONG
RET ;AND RETURN
;Here when end msg recd from imp
IMPEI0: MOVEI T1,ANXWAR ;SELECT WC/ADDR REG, CLEAR PIA
MNTXCT NTCONO ;..
MNTXCT NTDATI ;GET DATA
MOVEM T1,NTINP(P1) ;SAVE IT
MNTJRST NTIDUN ;DO INPUT DONE ROUTINE
SUBTTL PI Service for Output - Startup and First Level
;Routine to start msg going out. called at pi level, and at Main
;level if no output in progress
ANOSRT::PIOFF ;START OUTPUT
SKIPN NTOB(P1) ;ANY OUTPUT IN PROGRESS?
JRST IMPXO1 ;NO
PION ;YES, TURN PI BACK ON
RET ;AND RETURN
IMPXO1: SETOM NTOB(P1) ;MARK OUTPUT IN PROGRESS
PION ;NOW IT'S OK TO TURN PI BACK ON
SKIPLE NTNOP(P1) ;ANY NOP'S TO SEND?
JRST IOUNOP ;YES, GO SEND THEM
HLLZS NTBFFL(P1) ;ASSUME THIS WILL BE NCP'S OUTPUT BUFFER
PIOFF ;OWN MACHINE FOR Q HACKING
SKIPN T1,NTHOBO(P1) ;HI PRIORITY MSG WAITING?
JRST IMPIOT ;NO, CHECK LO PRIORITY
;HERE TO SEND A HIGH PRIORITY MESSAGE
LOAD T2,NBQUE,(T1) ;DOES IT HAVE A SUCCESSOR
JUMPN T2,IMPIO1 ;JUMP IF SO
SETZM NTHOBI(P1) ;IF NOT, CLEAR TAIL OF Q
SKIPA ;AND DON'T ADD NETWORK SECTION
IMPIO1: SETSEC T2,INTSEC ;SECTION BUFFERS ARE IN
MOVEM T2,NTHOBO(P1) ;FOR NEXT REMOVAL
JRST IMPIOC ;SEND BUFFER IN T1
;Select either an Internet buffer or low priority NCP buffer for
;output.
IMPIOT: ;HERE TO CHECK NON HPQs
PIOFF ;PROTECT THE QUEUES
CALL IMPIOL ;CHECK FOR NON IP OUTPUT TRAFFIC
JRST IMPIOC ;FOUND SOME SO SEND IT
CALL IMPIOO ;CHECK FOR IP OUTPUT TRAFFIC
JRST IMPIOC ;FOUND SOME SO SEND IT
PION ;QUEUES OK NOW
SETZ T1, ;GET A ZERO
SKIPLE T2,HSTGDM(P1) ;NEED TO SEND HOST-GOING-DOWN MESSAGE?
JRST IOUHGD ;YES SO SEND THE HOST GOING DOWN MSG
MNTXCT NTOCNO ;CONO A 0 AND SHUTDOWN THE OUTPUT SIDE
XMOVEI T1,IMODN2 ;DISPATCH WHEN IT IS TURNED ON
MOVEM T1,NTODSP(P1) ;..
SETZM NTOB(P1)
RET
;Check for an IP message. If one is present dequeue it and use it
IMPIOO: ;HERE TO CHECK FOR AN IP BUFFER
SKIPN T1,NTIOBO(P1) ;IP OUTPUT MESSAGE?
RETSKP ;NO
HLLOS NTBFFL(P1) ;REMEMBER OUT BUF IS INTERNET OWNED
LOAD T2,NBQUE,(T1) ;GET ITS SUCCESSOR
JUMPN T2,IMPIOP ;JUMP IF NOT LAST ONE
SETZM NTIOBI(P1) ;YES. MAKE QUEUE NULL
SKIPA
IMPIOP: SETSEC T2,INTSEC ;PLACE IN PROPER SECTION
MOVEM T2,NTIOBO(P1) ;UPDATE OUTPUT POINTER
RET ;WE FOUND A BUFFER
;Check for a non IP message. If one is present dequeue it and use it.
IMPIOL: ;HERE TO CHECK FOR AN NCP MSG
SKIPN T1,NTLOBO(P1) ;MSG WAITING TO GO OUT?
RETSKP ;NO
LOAD T2,NBQUE,(T1) ;GET BFR
JUMPN T2,IMPIO2
SETZM NTLOBI(P1) ;CLEAR TAIL
SKIPA ;AND LEAVE OFF SECTION NUMBER
IMPIO2: SETSEC T2,INTSEC ;SET BUFFER'S SECTION
MOVEM T2,NTLOBO(P1) ;SET NEW HEAD
RET ;AND GO OUTPUT THE BUFFER
IMPIOC: ;HERE WHEN WE HAVE DECIDED WHICH MESSAGE
PION ;PI'S ON NOW THAT Q'S ARE SAFE
MOVEM T1,NTOB(P1) ;...
MOVMS HSTGDM(P1) ;ENABLE ANOTHER GOING-DOWN IF ONE EXISTS
SETZRO NBQUE,(T1) ;DEQUEUE BUFFER FROM ITS OLD CHAIN
; Now decide on packing via message type
MOVEI T3,.IIINT ;ASSUME INTERNET FORMAT
HRRE T4,NTBFFL(P1) ;INTERNET OWN THE BUFFER?
JUMPL T4,IMPIOD ;YES
LOAD T2,IHHST,(T1) ;GET HOST
LOAD T1,IHLNK,(T1) ;GET LINK
CAIGE T2,FKHOST ;FAKE HOST?
CAILE T1,INTLNK ;OR LINK OUT OF RANGE?
SKIPA T3,[.IISPQ] ;YES, SPECIAL QUEUE FORMATTING.
MOVEI T3,.IINC2 ;SELECT 32 BIT MODE
IMPIOD:
XMOVEI T2,IMOLDR ;WHERE TO GO ON NEXT INTERRUPT
MOVEM T2,NTODSP(P1)
MOVEM T3,NTOTYP(P1) ;REMEMBER PACKING TYPE DECISION
MOVEI T1,ANXWAR ;SELECT WC/ADDR REG
MNTXCT NTOCNO ;DO AN OUTPUT CONO
MOVE T1,NTOB(P1) ;GET BUFFER BACK
XMOVEI T1,.NBLD0(T1) ;FIRST WORD TO SEND OUT
TXO T1,<<.NBLD2+1>B12> ;SEND 1ST 3 WORDS AND SOME FILLS
MNTXCT NTODTO ;DO A DATAO
MOVEI T1,ANOM36+ANOBSY+ANOCLE+ANXCHS ;SEND IT IN 36-BIT MODE
MNTXCT NTOCNO ;AND DO OUTPUT CONO
RET ;DONE WITH START-UP-OUTPUT ROUTINE
SUBTTL PI Service for Output - More Fill and 1822 Leader
;Here at PI level when leader and first fill word have been sent. Now
;re-send some more fill, and send H-H leader.
IMOLDR: XMOVEI T1,IMOLD3 ;WHERE TO COME ON NEXT INTERRUPT
MOVEM T1,NTODSP(P1) ;..
MOVE T2,NTOB(P1) ;BUFFER WE ARE WORKING ON
MOVE T4,NTOTYP(P1) ;GET THE PACKING CONTROL
XMOVEI T1,.NBHHL-1(T2) ;RESEND ANOTHER WORD AS PADS, THEN H-H LEADER
IOR T1,II1WCT(T4) ;SET UP RIGHT COUNT
MNTXCT NTODTO ;DO OUTPUT DATAO
MOVE T1,T2 ;PUT ADDRESS IN T1
LOAD T3,NBBSZ,(T1) ;THAT MIGHT BE ALL. CHECK SIZE OF BUFFER
CAILE T3,.NBHHL ;JUST THAT MUCH?
TDZA T1,T1 ;THERE'S MORE THAN THAT.
MOVEI T1,ANOEND ;THAT'S ALL. INCLUDE END OF MSG BIT
IOR T1,IO1CNO(T4) ;PLUS THE RIGHT WORD SIZE, ETC.
MNTXCT NTOCNO ;TELL INTERFACE
RET ;DONE WITH INTERRUPT
IO1CNO: ANOM36+ANOBSY+ANXCHS ;NCP 32 BIT MODE
ANOBSY+ANXCHS ;SPECIAL QUEUES
ANOBSY+ANXCHS ;INTERNET MODE
ANOM36+ANOBSY+ANXCHS ;NOT REFERENCED HERE
IO2CNO: ANOEND+ANOBSY+ANXCHS ;NCP 32 BIT MODE
ANOEND+ANOBSY+ANXCHS ;SPECIAL QUEUES
ANOEND+ANOBSY+ANXCHS ;INTERNET MODE
ANOEND+ANOBSY+ANXCHS ;NOT REFERENCED HERE
SUBTTL PI Service for Output - Send Remaining Data
;Here after completing the above, again on PI level. If more words to
;send, set them up.
IMOLD3: MOVEI T1,ANODON ;DONE BIT...
MNTXCT NTOCSZ ;CONSZ, WAS IT A SHORT MESSAGE?
JRST IMODN0 ;YES, GO WRAP UP. RELEASE BUFFER, ETC.
MOVE T2,NTOB(P1) ;BUFFER WE HAVE BEEN SENDING
MOVE T4,NTOTYP(P1) ;GET THE PACKING CONTROL
LOAD T1,NBBSZ,(T2) ;HOW MANY WORDS IN IT?
MOVE T3,II2LDT(T4) ;HOW FAR WE HAVE DONE SO FAR
SUBI T1,(T3) ;LESS THOSE SENT ABOVE
ASH T1,^D23 ;POSITION FOR AN10 WORD COUNT
IOR T1,T2 ;NEXT WORD TO GO OUT.
ADDI T1,(T3) ;ADJ COUNT
MOVEM T1,NTOUP(P1) ;SAVE
MNTXCT NTODTO ;DO A DATAO
MOVEI T1,@IO2CNO(T4) ;GET BITS FOR CONO
MNTXCT NTOCNO ;AND DO IT
XMOVEI T3,IMODN0 ;WHEN DONE, WE WILL RELEASE THE BUFFER
MOVEM T3,NTODSP(P1) ;..
RET ;DONE, DISMISS INTERRUPT
SUBTTL Build Host to IMP Going Down Message
;Here to make a Host Going Down message Get here when nothing to output
;and HSTGDM(P1) is .gt. 0. T2 has contents of HSTGDM(P1). HSTGDM is 0
;if not going down, +N if one needs to be sent, and -N if it has been
;sent. Host going down must be the last thing we tell the IMP. Sending
;after saying HGD means another HGD is needed.
IOUHGD: MOVNS HSTGDM(P1) ;DISABLE SUBSEQUENT HGDS
MOVEI T3,0 ;BUILD THE MESSAGE IN 2 AND 3
LSHC T2,-^D8 ;FROM DOWN-TIME AND REASON
DMOVEM T2,IIMBUF+1 ;AND USE THE SPECIAL IRREG MSG BUFFER
MOVE T2,H2IHGD ;PROTO HOST-GOING-DOWN MSG
MOVEM T2,IIMBUF ;TO THE SCRATCH BUFFER
XMOVEI T2,IIMBUF ;POINT TO THIS MSG
JRST IOUIRG ;GO SEND IT
;Here to make a nop message
IOUNOP: SOS NTNOP(P1) ;DECREMENT COUNT OF NOP'S TO SEND
MOVMS HSTGDM(P1) ;MAY NOW NEED ANOTHER GOING DOWN MSG
XMOVEI T2,H2INOP ;PROTOTYPE OF A NOP/PADDING REQUEST
IOUIRG: TXO T2,<<.NBLD2>B12> ;LENGTH OF THE MSG, DATA IN MON. SEC.
MOVEI T1,ANXWAR ;SET FOR WD CT/ADDR REGISTER
MNTXCT NTOCNO ;DO A CONO (T1) SETTING WC/ADDR REG
MOVE T1,T2 ;GET MESSAGE POINTER
MNTXCT NTODTO ;DO A DATAO ANO,T1
MOVEI T1,ANOM36+ANOBSY+ANOEND+ANXCHS ;START IT 36 BIT MODE
MNTXCT NTOCNO ;...
MOVE T1,TODCLK ;GET TIME NOW
ADDI T1,^D60*^D1000 ;TIMEOUT IN ONE MINUTE
MOVEM T1,NTTOUT(P1) ;SET INTERFACE HUNG TIMEOUT
XMOVEI T1,IMODN2 ;WHEN DONE, NO BUFFER TO RELEASE
MOVEM T1,NTODSP(P1) ;SET DISPATCH ADDRESS
RET
;Prototypes of the two H2I irreg messages we ever send.
;Prototype Host-to-Imp NOP msg, with padding control.
H2INOP: BYTE (4)0,ITY%LL (16)0 (8).IHNOP (4)0
EXP 0
BYTE (4)0,STY%NP ;DESIRED PADDING AMOUNT
;Prototype Host-to-IMP Host-going-down message.
H2IHGD: BYTE (4)0,ITY%LL (16)0 (8).IHHGD (4)0
; BYTE (4)0 (24)0 (3)DAYOFWEEK (5)HOUR
; BYTE (4)5MINPERIOD, REASON
SUBTTL PI Service for Output - Output Done Interrupt
;Here after "out done" interrupt for a real buffer
IMODN0: MNTCALL NTODUN ;DO OUTPUT DONE STUFF
;Here after "out done" interrupt when no buffer to release.
IMODN2: SETZM NTTOUT(P1) ;CLEAR OUTPUT HUNG TIMEOUT
SETZM NTOB(P1) ;MARK NO OUTPUT IN PROGRESS
SKIPGE HSTGDM(P1) ;FINISHED HOST-GOING-DOWN?
JRST ANXKI2 ;YES, GO FINISH TAKING INTERFACE DOWN
CALLRET ANOSRT ;START NEXT MSG IF ANY
;AND DONE
SUBTTL ANXSCK - Check State of Interface
;ANXSCK Check state of interface (NCT pointed by P1)
;Returns+1 Interface off
;Returns+2 Interface on
ANXSCK::SAVEAC <T1> ;SAVE AN AC
MNTXCT NTCONI ;GET CURRENT STATUS
TXNN T1,<1B4+1B5> ;IS IT POWERED UP, WITH A CABLE IN IT?
SOSA INTFLG ;NO, SO DON'T REQUEST RUN INTERNET FORK
TXNE T1,<ANIIID+ANIIWD> ;YES. IS READY LINE ALSO OK?
SETOM NTERRF(P1) ;NO, FLAG AN ERROR
SKIPL NTERRF(P1) ;ERROR SEEN NOW OR BEFORE?
RETSKP
MOVNI T1,2 ;FLUSH 2 MESSAGES
MOVEM T1,NTFLS(P1)
MOVEI T1,10 ;AND SEND SOME NOPS
MOVEM T1,NTNOP(P1)
MNTXCT NTCONI ;SEE IF PIAS ARE ON
ANDI T1,77
MOVEI T1,ANICLE(T1) ;CLEAR THE ERROR FLOP
MNTXCT NTCONO ;...
AOS INTFLG ;RUN INTERNET FORK UNLESS POWER OFF
RET
SUBTTL ANXKIL - Shut Down an AN20
;Here from down-sequence processing in NCPFRK to completely shut off
;the hardware device.
; T1/ Why going down, a la 1822 or -1 to abort
; T2/ When back up
ANXKIL::
JUMPL T1,ANXKI2 ;FORGET TELLING IMP, SHUT IT OFF
SKIPL HSTGDM(P1) ;TOLD IMP WERE GOING AWAY?
CALLRET IMPHLT ;NO, DO IT NOW, THEN ...
;Back here after going down message sent
ANXKI2: MOVEI T1,0 ;TURN OFF OUTPUT SIDE
MNTXCT NTOCNO ;...
MOVEI T1,ANIRST ;CLEAR DEVICE
MNTXCT NTCONO
MOVEI T1,ANXVAR ;HAVE TO POINT TO WHERE HOST READY IS
MNTXCT NTCONO
MOVEI T1,NTIINT(P1) ;CLEAR READY, LEAVE INTERRUPT ADDRESS ALONE
HRLI T1,MSEC1 ;MAKE SURE INTERRUPT INST XCTS IN SECTION ONE
MNTXCT NTDATO ;...
MOVE T1,NTRDY(P1) ;RECORD IF ANYTHING CHANGED
IOR T1,NETON(P1)
IOR T1,NTORDY(P1)
SETZM NTTOUT(P1) ;CLEAR OUTPUT HUNG TIMEOUT
JUMPE T1,ANXKIX ;NOTHING CHANGED SO EXIT QUIETLY
SETZM NTRDY(P1) ;IMP OFF
SETZM NTORDY(P1) ;OUTPUT OFF
AOS NTSTCH(P1) ;JUST CHANGED STATE
AOS JB0FLG ;GET IT PRINTED
ANXKIX: RET
SUBTTL PI Service Initialization
;Call here from MNTINI when initializing the networks, not on every
;cycle of the ready line.
ANXINI::XMOVEI T1,IMIN0X ;RESET DISPATCHES
MOVEM T1,NTIDSP(P1) ;INPUT PI DISPATCH TO SHUT OFF DEVICE
XMOVEI T1,IMODN2 ;OUTPUT PI DISPATCH TO START NEW MSG
MOVEM T1,NTODSP(P1)
SETZM HSTGDM(P1) ;CANCEL GOING DOWN MESSAGES
RET
SUBTTL ANXRSS - Set AN20 Online If IMP Online
;Call here from NCPFRK, process level, when IMP is wanted up but net is
;currently down.
ANXRSS::SETZM NTTOUT(P1) ;CLEAR OUTPUT HUNG TIMEOUT
MNTXCT NTCONI ;GET STATUS (INTO T1)
TXNE T1,<1B4+1B5> ;POWER UP?
TXNE T1,<ANIIID> ;IMP READY?
RET ;NO, STOP HERE
SETZM NTERRF(P1) ;CLEAR NOTICES OF IMP ERRORS
HRRES NETON(P1) ;AND ANY DOWN REQUESTS
MOVEI T1,ANIRST ;CLEAR DEVICE
MNTXCT NTCONO
MOVEI T1,ANXVAR+ANICLE ;SET VECTOR ADDRESS WORDS
MNTXCT NTCONO ;...
MOVEI T1,NTIINT(P1) ;POINT TO INTERRUPT INSTRUCTION
HRLI T1,MSEC1 ;MAKE SURE INTERRUPT INST XCTS IN SECTION ONE
TXO T1,ANIHRL ; AND SET READY LINE
MNTXCT NTDATO ;..
MOVEI T1,ANOCLE+ANXVAR ;SAME FOR OUTPUT
MNTXCT NTOCNO ;...
MOVEI T1,NTOINT(P1) ;SET VECTOR INT LOC FOR OUTPUT
HRLI T1,MSEC1 ;MAKE SURE INTERRUPT INST XCTS IN SECTION ONE
MNTXCT NTODTO ;DO A DATAO ON OUTPUT DEVICE
MOVNI T1,2
MOVEM T1,NTFLS(P1) ;INIT FLUSH COUNT
MOVEI T1,10
MOVEM T1,NTNOP(P1)
MOVEI T1,^D1000
DISMS ;ALLOW TIME FOR READY LINE TO SETTLE
AOS NTSTCH(P1) ;CAUSE CHANGE IN STATE TO BE NOTED
AOS JB0FLG ;BY JOB0
GTAD
MOVEM T1,NTXUPP(P1) ;SAVE TIME WHEN IT CAME UP
MOVEI T1,ANOBSY+ANXCHS ;TELL OUTPUT SIDE TO GO
SKIPE NTOB(P1) ;IF THERE IS A BUFFER IN TRANSIT
MNTXCT NTOCNO ;OUTPUT CONO
SETOM NTRDY(P1) ;INDICATE FULLY UP
SETOM NTORDY(P1) ;ALLOW OUTPUT
CALL INTUP ;INTERFACE IS UP
CALL ANOSRT ;START OUTPUT IF NEEDED
CALLRET ANISRT ;START INPUT
SUBTTL IMPFPF - Handle Possible AN20 Induced IOPGFs
;This routine determines if the cause of an IO Page fail was caused
;by the AN20 accessing a bad address. Scan through the NCTs looking
;for an AN20. Check the AN20 to see if ANI or ANO was touching the
;page in question. If so shut down the AN20.
XRENT (IMPFPF,G)
;ROUTINE TO DETERMINE IF AN10/20 CAUSED
;AN IOPGF....PAGE NUMBER IS IN T1
SAVEAC <P1> ;DONT TRASH P1
SKIPA P1,NCTVT ;POINT TO THE NCT VECTOR TABLE
IMPFPL: LOAD P1,NTLNK,(P1) ;GET LINK TO THE NEXT NCT
JUMPE P1,R ;YES SO WE DID NOT CAUSE THE PROBLEM
LOAD T2,NTDEV,(P1) ;GET THE DEVICE TYPE
CAIE T2,NT.ANX ;IS IT AN AN20?
JRST IMPFPL ;NO SO CHECK THE NEXT NCT
MOVE T4,T1 ;SAVE THE PAGE NUMBER
MOVEI T1,ANXWAR+ANXCHS ;BITS FOR THE CONO
MNTXCT NTCONO ;SELECT IWAR
MNTXCT NTDATI ;GET THE INPUT WORD ADDRESS REGISTER
MOVE T2,T1 ;SAVE THE IWAR
MOVEI T1,ANXWAR+ANXCHS ;BITS FOR THE CONO
MNTXCT NTOCNO ;SELECT OWAR
MNTXCT NTODTI ;GET THE OUTPUT WORD ADDRESS REGISTER
MOVE T3,T1 ;SAVE THE OWAR
MOVE T1,T4 ;PUT THE PAGE NUMBER BACK
LOAD T2,VPGNO,T2 ;GET THE PAGE NUMBER INPUT SIDE WORKING ON
LOAD T3,VPGNO,T3 ;GET THE PAGE NUMBER OUTPUT SIDE WORKING ON
CAME T1,T2 ;INPUT SIDE CAUSE IOPGF?
CAMN T1,T3 ;OUTPUT SIDE CAUSE IOPGF?
SKIPA ;YES WE CAUSED IT
JRST IMPFPL ;WE DID NOT CAUSE IT SO CHECK NEXT NCT
;HERE WHEN WE CAUSED THE IOPGF
SETO T1, ;DO NOT TELL THE IMP WHY
MNTCALL NTKILL ;KILL THE AN20
BUG.(CHK,ANIOPF,IMPANX,HARD,<IO page fail from AN20>,<<P1,NCT>>,<
Cause: The AN20 was found to be the cause of an IO Page Fail.
This means that the hardware got a page fault during an interrupt
instruction. This may indicate a hardware problem with the AN20.
Data: NCT - NCT at the time of the BUGCHK.
>,,<DB%NND>) ;[7.1210]
RETSKP ;AND SKIP RETURN TO APRSRV
SUBTTL End of IMPANX
TNXEND
END