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d76int.mac
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TITLE D76INT - INTERUPT SERVICE FOR DC76 FRONT END V065
SUBTTL DONALD LEWINE 10 SEP 85
SEARCH F,S
$RELOC
$HIGH
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
; OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
.CPYRT<1973,1986>
;COPYRIGHT (C) 1973,1974,1975,1976,1977,1978,1979,1980,1984,1986
;BY DIGITAL EQUIPMENT CORP., MAYNARD, MASS.
;ALL RIGHTS RESERVED.
;
;
XP VDC76I,065 ;VERSION NUMBER FOR MAP AND GLOB
D76INT::ENTRY D76INT
;D76INT SERVICES INTERUPTS FROM THE DC76. IT MAINTAINS 2 QUEUES
; ONE OF MESSAGES FROM THE -11 THE OTHER MESSAGES TO THE -11. ALL
; DATA GOES VIA THESE QUEUES.
DLMAP ;DEFINE OFFSETS IN DL10 MAP
;FRONT END CONTROL FUNCTIONS
XP FECXMT,2 ;TRANSMIT DATA
XP FECCOB,4 ;CLEAR OUTPUT BUFFER
XP FECMDM,6 ;MODEM CONTROL
XP FECEXM,10 ;EXAMINE
XP FECDEP,12 ;DEPOSIT
XP FECFNI,14 ;FUNCTION NOT IMPLEMENTED IN THE -10
XP FECLPC,16 ;LINE PARAMETER CONTROL
;MODEM CONTROL FUNCTIONS
XP MDMOFF,2 ;TURN MODEM OFF
XP MDMON,4 ;TURN MODEM ON
XP MDMRNG,6 ;DATASET IS RINGING
XP MDMINI,10 ;COMPUTER RESTARTED
;AC USAGE IN D76INT
;P PUSH DOWN POINTER
;J (PRESERVED) BASE ADDRESS FOR THIS PDP-11'S COMMON MEMORY
; AREA.
;U LDB ADDRESS OR DSCTAB INDEX
;T1 TEMP
;T2 TEMP
;T3 CHARACTER
;T4 TEMP
;P1-P4 PRESERVED AC'S. NEVER CONTAIN GLOBAL INFORMATION
;AC'S NOT LISTED ABOVE ARE NOT READ OR WRITTEN BY D76INT
;ROUTINE TO START OUTPUT FOR QUEUED PROTOCOL
;CALLED FROM COMDEV WITH T1 SETUP TO THE QUEUE HEADER ADDRESS
D76STO::PUSH P,T1 ;SAVE QUEUE HEADER ADDRESS
PUSHJ P,TOTAKE## ;GET AN ACTIVE LINE
JRST TPOPJ## ;IF NONE
MOVEI T1,L1RCHP##
TDNE T1,LDBBYT##(U) ;ANY CHANGES?
PUSHJ P,[ANDCAM T1,LDBBYT##(U)
MOVEI T1,ISRCHP##
PJRST @LDBISR##(U)]
SKIPGE LDBDCH##(U) ;LINE BUSY
PUSHJ P,XMTCHR## ;NO, START OUTPUT NOW
JRST D76ST1 ;DON'T TYPE ON IDLE LINE
MOVEI T1,ISRTYP## ;FUNCTION TO TYPE CHAR
PUSHJ P,@LDBISR##(U) ;TYPE IT
PUSHJ P,CLRIRM## ;CLEAR IRMA CATCHER BITS
D76ST1: POP P,T1 ;RESTORE QUEUE HEADER ADDRESS
JRST D76STO ;LOOP OVER WHOLE QUEUE
;SUBROUTINE TO EXERCISE CONTROL OVER A DATASET
;CALL WITH:
; MOVEI J,DL10 BASE ADDRESS
; MOVEI U,DSCTAB-INDEX
; MOVEI T3,TRANSACTION-CODE
; PUSHJ P,D76DSC
; RETURN HERE
D76DSC::SETZM T2 ;FLAG FOR INVALID FUNCTION
CAIN T3,DSTON## ;WANT TO TURN DATASET ON?
MOVEI T2,<MDMON>B27 ;YES--LOAD CODE
CAIN T3,DSTOFF## ;WANT TO TURN IT OFF?
MOVEI T2,<MDMOFF>B27 ;YES--LOAD THAT CODE
CAIN T3,DSTREQ## ;WANT TO KNOW STATUS?
JRST [MOVEI T3,DSTNAC## ;TELL SYSINI NOT TO TAKE ACTION
POPJ P,] ; DC76 WILL REPORT STATUS (MAY HAVE DONE SO ALREADY)
JUMPE T2,CPOPJ## ;INVALID FUNCTION
SKIPG DWN(J) ;DO WE THING HE'S UP?
POPJ P, ;NO. DON'T QUEUE ANYTHING
MOVE T3,T2 ;MOVE SUB FUNCTION
HRRZ T2,DSCTAB##(U) ;PICK UP LINE NUMBER
SUB T2,LTO(J) ;REMOVE LINE TABLE OFFEST
TRO T2,<FECMDM>B27 ;JAM IN FUNCTION CODE
MOVE T1,[-2,,T2] ;POINTER TO ARGS
PJRST PUTMSG ;SEND TO THE DC76
;SUBROUTINE TO SETUP EVERYTHING ACCORDING TO LDB
;CALL WITH:
; MOVEI U,LDB-ADDRESS
; PUSHJ P,D76CHP
; RETURN HERE
D76CHP::LDB T3,LDPSPD## ;GET LINE SPEED
JUMPE T3,CPOPJ##
TRO T3,<LPCSPD>B27 ;SUBFUNCTION
PJRST D76LPC ;GO SET/CLEAR THAT BIT
;SUBROUTINE TO CHANGE HARDWARE PARAMETERS BASED ON TRMOP. AND SET TTY
;CALL WITH:
; MOVE T3,[<SUBFUNCTION>B27+DATA]
; MOVEI U,ADDRESS-OF-LDB
; PUSHJ P,D76LPC
; RETURN HERE
D76LPC::LDB T2,LDPLNO## ;SET UP LINE NUMBER
SUB T2,LTO(J) ;MAKE CORRECT LINE RELATIVE TO DC76
JUMPL T2,CPOPJ## ;NEGATIVE IS NOT IN RANGE
CAML T2,NTT(J) ;IS IT IN RANGE?
POPJ P,0 ;NO--JUST IGNORE IT
TRO T2,<FECLPC>B27 ;PUT IN FUNCTION
MOVE T1,[-2,,T2] ;POINT TO ARGUMENT
SKIPLE DWN(J) ;IS 76 UP?
PJRST PUTMSG ;GO STORE IN QUEUE
POPJ P,0 ;76 IS DOWN
;SUBROUTINE TO SEE IF FRONT END IS ON LINE
;CALL WITH:
; PUSHJ P,D76OFL
; OFF-LINE
; ON-LINE
D76OFL::SKIPLE DWN(J) ;IS 76 UP?
AOS (P) ;YES
POPJ P,0 ;NO
;SUBROUTINE TO TYPE A CHARACTER ON A DC76 LINE
;CALL WITH:
; MOVEI U,LDB
; MOVEI J,DL10 BASE (DONE VIA PUSHJ P,@LDBISR(U))
; MOVE T3,DATA
; PUSHJ P,D76TYP
; RETURN HERE
D76TYP::MOVE T1,[-2,,T2] ;2 WORD ENTRY IN THE AC'S
LDB T2,LDPLNO## ;T2 IS THE LINE NUMBER
SUB T2,LTO(J) ;CONVERT TO DC76 LINE NUMBER
CAML T2,NTT(J) ;IS LINE NUMBER TOO BIG?
POPJ P,0 ;YES--RETURN
TRO T2,<FECXMT>B27 ;FUNCTION = XMIT DATA
SKIPG DWN(J) ;IS DC76 KNOWN TO BE DOWN?
PJRST TSETBO## ;YES--CLEAR OUTPUT BUFFER AND RETURN
; DOING NO OUTPUT.
ANDI T3,377 ;REMOVE JUNK FROM CHAR
;FALL INTO PUTMSG
;SUBROUTINE TO QUEUE A MESSAGE OVER TO THE PDP-11
;CALL WITH:
; MOVEI J,BASE OF DL10 MAP
; HLL T1,-SIZE OF MESSAGE
; HRR T1,ADDRESS OF FIRST WORD (T2-T4 OK TO USE)
; PUSHJ P,PUTMSG
; RETURN HERE
PUTMSG::PUSHJ P,SAVE3## ;SAVE P1 - P3
SCNOFF
MOVE P1,TEP(J) ;TO -11 PUTTER
MOVE P2,TEA(J) ;TO -11 QUEUE
HRLI P2,P1 ;INDEX REG. FOR @P2
PTMSGL: AOS P1 ;BUMP POINTER
CAMN P1,EBS(J) ;OFF THE END?
SETZM P1 ;YES--WRAP AROUND
CAMN P1,TEG(J) ;QUEUE FULL
JRST PTMSGX ;YES--REPORT LOSSAGE
MOVE P3,(T1) ;GET DATA WORD
MOVEM P3,@P2 ;STORE IN THE QUEUE
AOBJN T1,PTMSGL ;LOOP FOR WHOLE MESSAGE
MOVEM P1,TEP(J) ;NOW! STORE THE UPDATED POINTER.
PJRST SONPPJ## ;RESTORE PI AND RETURN
;HERE WHEN THE QUEUE IS FULL
PTMSGX:
SCNON
SKIPN HLT(J) ;DC76 HALTED?
SKIPE OK(J) ; OR HUNG?
POPJ P, ;YES, PRINT ERROR MESSAGE IN COMDEV
;AT THIS POINT THERE SHOULD BE SOME CLEVER CODE, BUT...
STOPCD CPOPJ##,DEBUG,DC76QF, ;++DC76 QUEUE FULL
;HERE ON A DC76 INTERRUPT WITH:
; J = DL10 MAP
; P = SCNPDP
D76KII: MOVE J,(W)
PUSHJ P,GETMSG ;GET A DATA BYTE FROM THE QUEUE
;COME HERE WHEN WE THINK THE DC76 IS DOWN.
JRST [AOS EMPTYI ;COUNT THE EVENT
POPJ P,0] ;AND DISMISS
LDB T2,[POINT 8,T1,27] ;GET THE FUNCTION
CAILE T2,FUNMAX ;FUNCTION TOO BIG
MOVEI T2,0 ;YES--KNOCK DOWN TO SIZE
SKIPL FUNTAB(T2) ;LINE NUMBERED FUNCTION?
JRST D76KI1 ;NO--CONTINUE BELOW
ANDI T1,377 ;MASK DOWN TO LINE NUMBER
CAML T1,NTT(J) ;VALID LINE NUMBER
JRST NGLINE ;NO--FLUSH
D76KI1: SKIPN FUNTAB(T2) ;IS FUNCTION IMPLEMENTED?
JRST FNIFLT ;NO--GENERATE FUNCTION NOT IMPLEMENTED
MOVSI T3,(FC.DSC) ;DATA SET CONTROL FUNCTION?
TDNE T3,FUNTAB(T2) ; ..
SKIPA U,DTO(J) ;YES--GET DSCTAB OFFSET
MOVE U,LTO(J) ;NO--GET LINTAB OFFSET
ADD U,T1 ;GET CORRECT NUMBER
PUSHJ P,@FUNTAB(T2) ;DO THE RIGHT THING
JRST D76KII ;LOOP FOR MORE
;HERE IF WE HAVE NOT IMPLEMENTED A GIVEN FUNCTION
FNIFLT: TRO T2,<<FECFNI>B27>;ADD IN FUNCTION
HRROI T1,T2 ;POINTER TO ENTRY
AOS XMTFNI ;NUMBER OF TIMES WE SAID THIS
PJRST PUTMSG ;SAY IT NOW
;HERE ON A LINE NUMBER OUT OF RANGE
NGLINE: MOVSI T1,(FC.2WD) ;TWO WORD FUNCTION?
TDNE T1,FUNTAB(T2) ; ??
PUSHJ P,GETMSG ;YES--FLUSH THE 2ND WORD
JRST D76KII ;LOOK FOR MORE STUFF
JRST D76KII ;LOOK FOR MORE STUFF
;TABLE OF FUNTIONS FOR MESSAGES FROM DC76
FC.LNO==1B0 ;LINE NUMBERED FUNCTION
FC.DSC==1B1 ;DATA SET FUNCTION
FC.2WD==1B2 ;TWO WORD FUNCTION
FUNTAB: 0 ;NO FUNCTION ZERO!!
FC.LNO+XMTINT## ;(1)TRANSMIT DONE
FC.LNO+FC.2WD+RCVDAT ;(2)RECEIVED DATA
WRDF11 ;(3)WORD FROM THE -11
FC.LNO+FC.2WD+FC.DSC+MDMFUN ;(4)MODEM CONTROL
REJECT ;(5)FUNCTION REJECTED
FC.2WD+FC.LNO+LPCFUN ;(6)LINE PARAMETER CONTROL
FUNMAX==.-FUNTAB-1
;HERE ON RECEIVE DONE
RCVDAT: PUSHJ P,GTMSGH ;GET THE DATA BYTE
MOVEI T3,CK.CHR ;COPY DATA TO CORRECT AC
AND T3,T1 ; ..
PJRST RECINT## ;CALL SCNSER
;HERE WITH A WORD FROM THE -11
WRDF11: PUSHJ P,GTMSGH ;GET THE DATA WORD
MOVEM T1,DATF11 ;STORE DATA FROM -11
SKIPN T1,C11USR ;IS THE A USER OF THE CAL11. UUO?
POPJ P,0 ;NO--STRANGE
PJRST WAKJOB## ;YES--WAKE HIM UP
;HERE IF THE -11 REJECTS A COMMAND
REJECT: AOS CMRCNT ;COUNT THE EVENT
POPJ P,0 ;RETURN
;HERE ON A MODEM CONTROL FUNCTION
MDMFUN: PUSHJ P,GTMSGH ;GET WORD OR HALT
ROT T1,-1 ;DIVIDE BY 2
SKIPLE T3,T1 ;ODD
CAILE T1,6 ;OR TOO BIG?
POPJ P,0 ;YES--IGNORE
PJRST DSCREC## ;CALL SCNSER
;HERE ON A LINE PARAMETER CONTROL MESSAGE
LPCFUN: PUSHJ P,GTMSGH ;GET THE MESSAGE
LDB T2,[POINT 7,T1,26] ;GET THE FUNCTION
CAILE T2,LPCMAX ;SKIP IF NOT TOO BIG
POPJ P,0 ; IGNORE THE MESSAGE
JRST @LPCTAB(T2) ;ELSE PROCESS FUNCTION
LPCTAB: CPOPJ## ;(0)ILLEGAL -- JUST IGNORE
RLPSPD ;(1)SET SPEED
LPCMAX==.-LPCTAB-1
RLPSPD: MOVE U,LINTAB##(U) ;SET UP 'U' FOR DPB
SE1XCT <DPB T1,LDPSPD##> ;STORE NEW SPEED
POPJ P,0 ;AND RETURN
;SUBROUTINE TO GET A WORD FROM THE TO -10 QUEUE OR DIE TRYING
;CALL WITH:
; MOVEI J,ADDRESS-OF-MAPPED-AREA
; PUSHJ P,GTMSGH
; RETURN HERE
;
GTMSGH::PUSHJ P,GETMSG ;CALL GETMSG
STOPCD CPOPJ##,DEBUG,DC76MS, ;++DC76 MESSAGE IS SHORT
POPJ P,0 ;RETURN
;SUBROUTINE TO GET A WORD FROM THE TO -10 QUEUE
;CALL WITH:
; MOVEI J,DL10 BASE ADDRESS
; PUSHJ P,GETMSG
; RETURN HERE IF QUEUE EMPTY
; RETURN HERE WORD IN T1
GETMSG: PUSHJ P,SAVE1## ;USE NO AC'S
MOVE P1,TTG(J) ;P1 _ TO TEN GETTER
CAMN P1,TTP(J) ;QUEUE EMPTY?
POPJ P,0 ;YES--NONSKIP RETURN
AOS P1 ;INCREMENT GETTER
CAMN P1,TBS(J) ;TIME TO WRAP AROUND?
SETZM P1 ;YES--BACK TO THE START
PUSH P,P1
ADD P1,TTA(J) ;POINT TO QUEUE
MOVE T1,(P1) ;GET THE DATUM
POP P,TTG(J) ;SHOW 11 WE HAVE MOVED
JRST CPOPJ1## ;RETURN
;HERE WHEN WE THINK THE DC76 IS DOWN
D76DWN:
D76DSP==:CPOPJ## ;WE DON'T USE ANF-10 FEK ENTRY VECTORS
POPJ P,
;COME HERE WHEN A DC76 PDP11 COMES UP
D76III::PUSHJ P,SAVE2## ;SAVE P1-P2
MOVE P1,DLXWIN##(W) ;POINT P1 TO WINDOW
MOVE T1,[PUSHJ P,D76KII] ;INTERRUPT INSTR
MOVEM T1,DLXINI##(W)
MOVE T1,[XWD MC11FN,C11FTB]
MOVEM T1,DLXCAL##(W) ;CAL11. DISPATCH TABLE
MOVE T1,[PUSHJ P,D76DWN]
MOVEM T1,DLXPRG##(W) ;"DOWN" INSTRUCTION
MOVEI P2,1 ;FLAG AS UP
MOVEM P2,DWN(P1) ; ..
MOVE T1,[310000,,DPYWRD] ;SET UP FOR LIGHTS
MOVEM T1,ESA(P1) ; ..
TLZ T1,(1B2) ; ..
MOVEM T1,WNU(P1) ; ..
POPJ P, ;ALL DONE.
;CAL11. UUO FOR DC76
;CALL WITH:
; MOVE AC,[+LENGTH,,BLK]
; CAL11. AC, ;CALLI 125
; ERROR RETURN
; WIN RETURN
; ENTER WITH DL10 BASE IN W, LENGTH OF BLOCK IN T3.
; WINDOW BASE IN P1.
PRVUSR==400000 ;USER MUST HAVE JB,POK PRIVILIGE
C11FTB::XWD PRVUSR,DEP11 ;(0) DEPOSIT TO -11
XWD PRVUSR,EXAM11 ;(1)EXAMINE THE -11
XWD PRVUSR,QUE11 ;(2)QUEUE A MESSAGE
XWD 0,CAL11N## ;(3)IDENTIFY ALL
XWD 0,CAL11S## ;(4)IS PORT UP OR DOWN
XWD PRVUSR,CPOPJ## ;(5) SEND MESSAGE
XWD PRVUSR,CPOPJ## ;(6) RECEIVE MESSAGE
XWD 0,TYP11 ;(7) RETURN TYPE
MC11FN==.-C11FTB
;SUBROUTINE TO DO A DEPOSIT OR EXAMINE
;CALL WITH:
; MOVE T3,+LENGTH
; MOVE P1,BASE ADDRESS
; PUSHJ P,DEP11/EXAM11
DEP11: SUBI T3,2 ;MUST HAVE ADDRESS AND DATA
JUMPL T3,ECOD7## ; ERROR 7 IF YOU DON NOT
PUSHJ P,GETWD1## ;GET ADDRESS
MOVE T3,T1 ;SAVE ADDRESS
PUSHJ P,GETWD1## ;GET THAT WORD
MOVE T4,T1 ;COPY IT
MOVEI T2,<<FECDEP>B27>;DEPOSIT FUNCTION
MOVE T1,[-3,,T2] ;POINTER
JRST DEPEX ;DO IT
EXAM11: SOJL T3,ECOD7## ;NEED ADDRESS
PUSHJ P,GETWD1## ;GET THE ADDRESS
MOVE T3,T1 ;COPY TO CORRECT AC
MOVEI T2,<<FECEXM>B27>;FUNCTION FOR EXAMINE
MOVE T1,[-2,,T2] ;POINTER TO DATA
DEPEX: CAMN J,C11USR ;IS THIS USER THE ONE WHO IS WAITING?
SETZM C11USR ;YES--MUST HAVE USED ^C
SKIPE C11USR ;ANY USER WAITING
JRST ECOD4## ;YES--FATAL ERROR 4
MOVEM J,C11USR ;STORE OUR JOB NUMBER
MOVE J,P1 ;COPY 11 BASE ADDRESS
SETOM DATF11 ;FLAG AS UNKNOWN
PUSHJ P,PUTMSG ;QUEUE THE MESSAGE OVER TO THE -11
MOVE J,.CPJOB## ;PUT JOB NUMBER IN J FOR SLEEP UUO
MOVEI T1,12 ;SLEEP FOR 10.
PUSHJ P,SLEEP## ; SECONDS
SETZM C11USR ;FREE UP THE QUEUE
SKIPGE T1,DATF11 ;DID WE GET AN ANSWER?
PJRST ECOD5## ;NO--ERROR
PJRST STOTC1## ;YES--WE WON!!
;HERE TO RETURN TYPE OF FRONT END
TYP11: MOVEI T1,1 ;DC76 (.C1D76)
PJRST STOTC1 ;RETURN
;SUBROUTINE TO QUEUE A MESSAGE TO THE -11 FOR CAL11. UUO
;CALL WITH:
; MOVE M,STUFF FOR GETWD1
; MOVE T3,+LENGTH
; PUSHJ P,QUE11
QUE11: PUSHJ P,SAVE4## ;ALWAYS SAVE THE P'S
CAILE T3,3 ;LESS THAN 3 WORDS?
JRST ECOD6## ;NO--ERROR 6
MOVE P2,T3 ;SAVE COUNT
MOVE P4,T3 ;SAVE IT AGAIN
MOVEI P3,T1 ;POINTER
QUE11L: PUSHJ P,GETWD1## ;GET ARGUMENT
PUSH P3,T1 ;STORE
SOJG P2,QUE11L ;DO UP TO 3 ARGS
MOVN T1,P4 ;COPY LENGTH FROM AC WE HAVE NOT ALTERED
HRLZ T1,T1 ;TO LEFT HALF
HRRI T1,T2 ;REST OF POINTER
MOVE J,P1 ;GET DL10 MAP BASE SET UP BY CALL11 IN COMDEV
AOS (P) ;GOOD RETURN
PJRST PUTMSG ;QUEUE IT OVER
$LOW
;MISC STORAGE
EMPTYI: 0 ;NUMBER OF DC76 INTERRUPTS WITH QUEUE EMPTY
DATF11: 0 ;DATA FROM -11 USED FOR DEBUGGING AND TESTING.
C11USR: 0 ;JOB NUMBER OF JOB DOINT CAL11. UUO
CMRCNT: 0 ;NUMBER OF COMMANDS REJECTED BY THE -11
XMTFNI: 0 ;NUMBER OF TIMES WE SAID "FECFNI"
DPYWRD: 0 ;WORD DISPLAYED IN DL10 MEMORY BUFFER
$LIT
END