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225 lines
6.7 KiB
Plaintext
225 lines
6.7 KiB
Plaintext
;==========================================================================
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;
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; File: SIMMachine.a
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;
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; Contains: Misc. routines for SIM SCSI State Machine
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;
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; Written by: Paul Wolf
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;
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; Copyright: © 1990-1993 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <SM12> 11/16/93 SAM Include HardwarePrivateEqu.a
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; <SM11> 10/14/93 pdw <MC> roll-in.
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; <MC2> 10/12/93 pdw Added support for Synchronous data transfers, rewrote State
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; Machine, message handling etc.
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; <SM10> 9/9/93 pdw Lots of little changes. Name changes, temporary cache_bug
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; stuff.
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; <SM9> 7/8/93 pdw Changed recording data for stack switching events to help Kurt
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; with StkLowPt problem.
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; <SM8> 6/29/93 pdw Massive checkins: Change asynchronicity mechanism to CallMachine
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; stack switching mechanism. Adding support for Cold Fusion.
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; Rearranging HW/SW Init code. Some code optimizations.
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; <SM7> 5/5/93 PW Converted names to meanies-friendly names. Updated with latest
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; from Ludwig stuff.
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; <LW3> 5/1/93 PW Got rid of RECORD_ON and RECORD_rCMD definitions (should only be
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; in Debug.a now.
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; <SM6> 2/9/93 PW Removed some PDM debug stuff that's not needed.
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; <SM5> 1/31/93 PW Update from the latest of Ludwig. Also changes required for PDM
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; (will update Ludwig with these as needed myself).
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; <SM4> 11/20/92 DCB Removed VM Stuff and put it into SCSIGlue.a
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; <SM3> 10/30/92 DCB Stopped recording VM calls
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; <SM2> 10/8/92 PW Removed lots of unused code.
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;
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;==========================================================================
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MACHINE MC68020 ; '020-level
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BLANKS ON ; assembler accepts spaces & tabs in operand field
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PRINT OFF ; do not send subsequent lines to the listing file
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; don't print includes
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INCLUDE 'SysEqu.a' ; for StkLowPt
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INCLUDE 'HardwarePrivateEqu.a'
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INCLUDE 'Traps.a' ; for _DebugStr
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INCLUDE 'Debug.a' ; for NAME
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INCLUDE 'ACAM.a'
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INCLUDE 'HALc96equ.a'
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PRINT ON ; do send subsequent lines to the listing files
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CASE OBJECT
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IMPORT RecordEvent
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;==========================================================================
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;**************************************************************************
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;
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; CallMachine -
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;
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;==========================================================================
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CallMachine PROC EXPORT
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IMPORT TheMachine
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IMPORT FreeMachine
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WITH HALc96GlobalRecord
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;………………………………………………………………………………………………………………………………………………………………………………………………………………………
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; Switch to SCSI stack, suspending the main "thread".
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; then call the selected routine
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; then switch back to the previous "thread" which may be the main thread or
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; it may be the interrupt thread (i.e. we're finally completing a request)
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;………………………………………………………………………………………………………………………………………………………………………………………………………………………
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move.l A5, -(sp) ; save caller's A5
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move.l 8(sp), A0 ; get SIMg parameter
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move.l (A0), A5 ; get HALg
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DisableSCSIIRQ ; disable ints before we go down into Machine
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IF STACK_RECORD_ON THEN
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pea '>> '
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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movem.l D3-D7/A2-A6, -(sp)
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bsr.s PrivateCallMachine ; MAGIC stack change here!!
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movem.l (sp)+, D3-D7/A2-A6
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IF STACK_RECORD_ON THEN
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pea '<< '
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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EnableSCSIIRQ ; enable ints after we come back out
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move.l (sp)+, A5 ; restore caller's A5
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rts
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NAME 'CallMachine'
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;……………………………………………………………………………………………………………………………………………………
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PrivateCallMachine
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; Switch to SCSI stack ……………………………………
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IF STACK_RECORD_ON THEN
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pea ' >>'
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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move.l StkLowPt, publicStkLowPt(A5) ; remember old StkLowPt
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clr.l StkLowPt ; and disable stack sniffer
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move.l sp, publicSP(A5) ; suspend main thread
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IF DEBUGGING THEN
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move.b #1, privStackState(A5)
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ENDIF
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move.l privStackTop(A5), sp ; create SCSI thread
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IF STACK_RECORD_ON THEN
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pea '>Mch'
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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; Call the State Machine ……………………………………
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; TheMachine( OSErr * finalStatus, SIM_IO ** completedIO, SIMglobals * SIMg)
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subq.l #6, sp ; allocate room for completedIO & finalStatus
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move.l A0, -(sp) ; pass SIMg into Machine
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pea 4(sp) ; sp=SIMg,completedIO
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pea 12(sp) ; sp=*completedIO,SIMg,completedIO,finalStatus
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bsr TheMachine
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lea 8(sp), sp ; get rid of parameters except for...
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move.l (sp)+, A0 ; ...SIMg
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move.l (sp)+, A1 ; get completedIO
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moveq.l #0, D1
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move.w (sp)+, D1 ; get finalStatus
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; Return to previous stack ……………………………………
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IF STACK_RECORD_ON THEN
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pea '<Mch'
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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IF DEBUGGING THEN
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move.b #4, privStackState(A5)
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ENDIF
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move.l publicSP(A5), sp ; resume previous thread
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move.l publicStkLowPt(A5), StkLowPt ; resume stack sniffing
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IF STACK_RECORD_ON THEN
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pea ' <<'
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move.l StkLowPt, -(sp)
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bsr RecordEvent
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addq.l #8, sp
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ENDIF
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tst.w D0 ; what did TheMachine return?
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beq.s @exit ; freeTheMachine? no -> rts (old API)
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move.l A0, -(sp) ; SIMg
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move.l A1, -(sp) ; ioPtr
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move.l D1, -(sp) ; finalStatus
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bsr FreeMachine
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lea 12(sp), sp ; get rid of parameters
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@exit
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rts
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NAME 'PrivateCallMachine'
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ENDWITH
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;**************************************************************************
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;
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; BlockInterrupts, UnblockInterrupts -
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;
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;==========================================================================
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BlockInterrupts PROC EXPORT
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move.w SR, D0
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ori.w #$0700,SR ; disable all ints
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rts
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NAME 'BlockInterrupts'
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ENDP
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;……………………………………………………………………………………………………………………………………………………
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UnblockInterrupts PROC EXPORT
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move.w 6(sp), SR
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rts
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NAME 'UnblockInterrupts'
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ENDP
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END
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