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tops20-v7-ft-dist2-clock
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language-sources/xpnpsi.mac
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;<LCAMPBELL.BLSNET>XPNPSI.MAC.2 11-Feb-82 20:11:10, Edit by LCAMPBELL
; Converted to modern (BLISS-36) calling conventions.
;<LCAMPBELL.BLSNET>BLSPS2.MAC.12 11-Feb-82 19:38:10, Edit by LCAMPBELL
; Majorly hacked, removed most routines except PSIINT, PSISIR, PSIRST, PSIWAI.
;<WEBBER>BLSPSI.MAC 8-May-80 12:30, Edit by WHEELER
;Changed references to .ENT0., .EXT0 to ENT0, EXT0 to correspond to new OTS
;<WEBBER>BLSPSI.MAC.24, 12-Mar-79 14:11, Edit by WEBBER
;Changed WAIT in PSIWAI and PSIRST to DISMS for 50 ms
;<WEBBER>BLSPSI.MAC.19, 22-Feb-79 09:47:52, Edit by GUNN
;Changed table sizes to be decimal 36 from octal 36
;Added code to check for valid channel number in PSIINT
; THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED
; OR COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
; COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1986.
; ALL RIGHTS RESERVED.
TITLE XPNPSI - XPN's interface to software interrupt system
SEARCH MONSYM,MACSYM
TWOSEG
ENTRY PSIINT,PSISIR,PSIWAI,PSIWXX,PSIRST
;This module supplies an interface to the tricky parts of the software
; interrupt system. Only those functions that cannot be performed in
; BLISS reliably are here (saving/restoring registers, etc.)
;
; Calls:
; CC = PSIINT( PRIORITY, ROUTINE, CHANNEL);
; CC = PSISIR( PROCESS_HANDLE);
; PSIWAI();
; PSIRST();
;
; Call PSIINT for each routine that will service an interrupt
; occurring in the specified channel at the specified priority
; level. PSIINT modifies "CHNTAB" so that the routine will be
; invoked on an interrupt.
; The routine, when entered, will have the channel number on which
; the interrupt is occurring on the stack. No register except the stack
; pointer need be preserved.
; Call PSISIR to set up the interrupt system. PSISIR first checks
; to see if an SIR has already been done; if so, it uses the already-set-up
; LEVTAB and CHNTAB instead of its own.
; Call PSIWAI to dismiss the process. PSIRXX should be stuffed with
; either a WAIT or DISMS JSYS. Interrupt routines desiring to wake up the
; process should put a JFCL in PSIRXX, in case the interrupt occurs before
; the process about to dismiss calls PSIWAI.
; Call PSIRST to wake up the dismissed process. It forces the PC past
; the DISMS or WAIT.
; Register definitions:
SP==17 ; Stack pointer
V==1 ; Value return register
RELOC 400000
;Call: PSIINT(Channel_number,Service_routine,Priority)
PSIINT::PUSH SP,2 ; Protect endangered registers
MOVE 1,-4(SP) ; Get channel
SKIPN LEVPTR ; Fail if we haven't yet inited tables
JRST BAD2 ; ..
SKIPN CHNPTR ; ..
JRST BAD2 ; ..
CAIL 1,0 ; Check for valid chan #
CAILE 1,^D35 ; 0 - 35 OK
JRST BAD2 ; Fail on bad chan #
MOVEI 2,DISPAT ; Get my servicer address
ADDI 2,(1) ; Add the channel # call is for
PUSH P,1 ; Save channel number
;**; [@@@] Insert at PSIINT + 13 1/2 CLR 4-Jan-83
HRL 2,-3(P) ;[@@@] Get priority as well as dispatch address
PUSH P,2 ; Save dispatch address
MOVEI 1,.FHSLF ; See if PA1050 is around to muck things up
PUSH P,3
GCVEC ; ..
POP P,3
JUMPLE 2,PSIIN0 ; No, thank God, just do simple things
MOVEI 1,6 ; COMPT. function code
MOVEM 1,COMPTA ; Into arg block
HRL 1,-4(SP) ; Get level number
HRR 1,(SP) ; Handler address
MOVEM 1,COMPTA+1 ; Set up COMPT. arg block
HRRZ 1,-4(SP) ; Get level number again
ADDI 1,PC1-1 ; Get PC save address
HRL 1,-1(SP) ; Get channel number
MOVEM 1,COMPTA+2 ; Stuff into arg block
MOVE 1,[3,,COMPTA] ; Length,,address of arg block
COMPT. 1, ; Shazzam!
JFCL ; Who cares ??
ADJSP P,-1 ; Adjust stack
POP P,1 ; Get channel number
MOVE 2,-3(P) ; Get service routine address
MOVEM 2,BLSTAB(1) ; Set up dispatch pointer
POP P,2 ; Restore reg 2
JRST GOOD ; Give good return
PSIIN0: POP P,2 ; Restore handler address
;**; [@@@] Insert at PSIIN0 + 1/2 CLR 3-Jan-83
SKIPE XFLAG ;[@@@] Using extended JSYSes?
JRST NOTX ;[@@@] No, skip this
HRRZ 2,2 ;[@@@] Yes, clear left half of CHNTAB entry
MOVE 1,-3(P) ;[@@@] ... and get the priority
DPB 1,[POINT 6,2,5] ;[@@@] ... put it into bits 0-5 of entry
NOTX: ;[@@@] Here for non-extended JSYS case
MOVE 1,CHNPTR ; Get CHNTAB address
ADD 1,(P) ; Add channel number
MOVEM 2,(1) ; Store in table for monitor
POP P,1 ; Restore channel number
MOVE 2,-3(SP) ; Get caller's servicer routine addr
MOVEM 2,BLSTAB(1) ; Store in table for my servicer
;**; [@@@] Remove three lines at GOOD - 4 CLR 4-Jan-83
;[@@@] MOVE 2,-2(SP) ; Get priority
;[@@@] ADD 1,CHNPTR ; Add CHNTAB address to channel number
;[@@@] HRLM 2,(1) ; and put priority in table for monitor
POP SP,2
GOOD: MOVEI V,1 ; Return value is successful
POPJ SP,
;Call: PSISIR(Process_handle)
PSISIR::PUSH SP,2 ; Get a register
MOVE 1,-2(SP) ; Get process handle
RIR ; Are LEVTAB and CHNTAB already declared?
;**; [@@@] Insert at PSISIR + 2 1/2 CLR 4-Jan-83
ERJMP [ ;[@@@] RIR% lost, better try XRIR%
MOVEI 2,3 ;[@@@] Size of XRIR% block
MOVEM 2,XBLOCK ;[@@@] ... store it
MOVEI 2,XBLOCK ;[@@@] Argument block address
MOVE 1,-2(SP) ;[@@@] Get process handle
XRIR% ;[@@@] Try XRIR% now
ERJMP BAD ;[@@@] Lose gracelessly
SETZM XFLAG ;[@@@] Remember to use extended JSYSes
MOVE 2,XBLOCK+1 ;[@@@] Get level table address
MOVEM 2,LEVPTR ;[@@@] ... and store it
MOVE 2,XBLOCK+2 ;[@@@] Get channel table address
MOVEM 2,CHNPTR ;[@@@] ... and store it
JRST PSISI0 ;[@@@] Join common exit
] ;[@@@] End of trying XRIR%
SETOM XFLAG ;[@@@] Remember not to use extended JSYSes
SKIPE 2 ; If they are,
JRST [ HLRZM 2,LEVPTR ; Remember their addresses
HRRZM 2,CHNPTR ; ..
JRST PSISI0]
MOVEI 2,LEVTAB ; Not already set up, assume we own the world
MOVEM 2,LEVPTR
MOVEI 2,CHNTAB
MOVEM 2,CHNPTR
;**; [@@@] Insert at PSISIR + 10 1/2 CLR 3-Jan-83
MOVE 1,-2(SP) ;[@@@] Get process handle
MOVEI 2,3 ;[@@@] Size of XSIR% block
MOVEM 2,XBLOCK ;[@@@] ... store it
MOVEI 2,LEVTAB ;[@@@] Level table address
MOVEM 2,XBLOCK+1 ;[@@@] ... store it
MOVEI 2,CHNTAB ;[@@@] Channel table address
MOVEM 2,XBLOCK+2 ;[@@@] ... store it
XSIR% ;[@@@] Try XSIR% first
ERJMP NOXSIR ;[@@@] ... must be a KS or something
SETZM XFLAG ;[@@@] Remember to use extended JSYSes
JRST PSISI0 ;[@@@] Join common exit
NOXSIR: MOVE 1,-2(SP) ;[@@@] Get process handle
SETOM XFLAG ;[@@@] Remember to not use extended JSYSes
MOVE 2,[LEVTAB,,CHNTAB]
SIR
ERJMP BAD2
PSISI0: POP SP,2
JRST GOOD
BAD2: POP SP,2
BAD: SETZM V ; 0 = FAILURE
POPJ SP,
;This routine is called (via PUSHJ SP,) when an interrupt occurs
HANDLR: AOS PTR ; In case i get interrupted here
POP SP,@PTR ; Save entry address
HRRZS @PTR ; (minus flags)
PUSH SP,16 ; Get a work register
MOVEI 16,15 ; Set up to save all registers
PUSH SP,(16) ; Preserve register on stack
SOJGE 16,.-1 ; and again... until AC0 has been...
MOVE 1,@PTR ; Subtract entry vector base address
SUBI 1,DISPAT+1 ; from actual entry address
PUSH SP,1 ; Put channel # on the stack
PUSHJ SP,@BLSTAB(1) ; Call user's BLISS routine
POP SP,1 ; Get channel # off of stack
SETZM 16 ; Prepare to pop all register
POP SP,(16) ; Restore AC
AOS 16 ; Get next AC
CAIE 16,16 ; Restored AC15 yet?
JRST .-3 ; No - go pop again
POP SP,16 ; Now restore AC16
SOS PTR ; Restore 'frame' of entry vector
DEBRK ; Return to interrupted routine
; Call: PSIWAI();
; - Suspends process. Caller must set up PSIWXX to either WAIT
; or DISMS (this because interrupt routine will change it to JFCL
; to prevent fast interrupts from causing infinite sleep).
PSIWAI::MOVE 1,-1(SP) ;Get wait time
JRST PSIWXX ;Go to low seg
RELOC
PSIWXX::HALT ;set up by caller
JFCL
JRST GOOD ;Return to caller
RELOC
; Call: PSIRST();
; - Called from an interrupt routine, resumes the suspended process if
; it is at a WAIT.
PSIRST::PUSH SP,2 ; Protect the registers
MOVE 1,@PTR ; Calculate the
SUBI 1,DISPAT+1 ; channel number
MOVE 2,CHNPTR ; Address of CHNTAB
ADD 2,1 ; Add channel number
HLRZ 1,(2) ; Pick up the priority on the channel
;**; [@@@] Insert at PSIRST + 5 1/2 CLR 3-Jan-83
SKIPN XFLAG ;[@@@] Extended JSYSes?
LSH 1,-14 ;[@@@] Yes, move priority over
MOVE 2,LEVPTR ; Get address of LEVTAB
ADDI 2,-1(1) ; Compute offset (zero-origin)
MOVE 1,@(2) ; Get PC for interrupted routine
;**; [@@@] Insert at PSISRT + 10 1/2 CLR 4-Jan-83
SKIPN XFLAG ;[@@@] Skip if not extended
JRST [MOVEI 1,@0(2) ;[@@@] Get PC address (first word)
AOS 1 ;[@@@] Get second word (real PC)
MOVE 1,0(1) ;[@@@] Get instruction at real PC
JRST .+1] ;[@@@] Join main code
MOVE 1,-1(1) ; If the last instruction
CAME 1,[DISMS] ; was WAIT or DISMS
CAMN 1,[WAIT] ; ..
;**; [@@@] Change at PSIRST + 14 CLR 4-Jan-83
JRST [MOVE 2,0(2) ;[@@@] Get PC (flags only if extended)
SKIPN XFLAG ;[@@@] Skip if not extended
AOS 2 ;[@@@] Get second word (user PC address only)
AOS 0(2) ;[@@@] Increment the user PC
JRST .+1] ;[@@@] Leave literal
POP SP,2
JRST GOOD ; Return to caller
DISPAT: REPEAT ^D36,<PUSHJ SP,HANDLR> ; Create entry table (so I can
; figure out which chan interrupted)
RELOC
BLSTAB: REPEAT ^D36,<EXP 0> ; Dispatch to BLISS routines
CHNTAB: REPEAT ^D36,<EXP 0> ; Dispatch to my servers
LEVTAB: XWD 0,PC1
XWD 0,PC2
XWD 0,PC3
LEVPTR: BLOCK 1
CHNPTR: BLOCK 1
;**; [@@@] Change at PC1 CLR 3-Jan-83
PC1: BLOCK 2 ;[@@@] If using extended addressing JSYSes:
PC2: BLOCK 2 ;[@@@] word 0: flags
PC3: BLOCK 2 ;[@@@] word 1: PC
;**; [@@@] Insert after PC3 CLR 3-Jan-83
XBLOCK: BLOCK 3 ;[@@@] XRIR%/XSIR% argument block:
;[@@@] count
;[@@@] level table pointer
;[@@@] channel table pointer
XFLAG: BLOCK 1 ;[@@@] If 0, use extended JSYSes;
;[@@@] if 1, use old JSYSes
COMPTA: BLOCK 3
PTR: EXP ADDR3-1 ; Pointer to where to save entry
; address when a high-P interrupt
; occurs.
ADDR3: EXP 0
ADDR2: EXP 0
ADDR1: EXP 0
END