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191 lines
4.9 KiB
Plaintext
191 lines
4.9 KiB
Plaintext
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;____________________________________________________________________________________
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;
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; File: HALc96AMIC.a
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;
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; Contains: Stuff for 53c96/AMIC machines (PDM)
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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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;
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; Change History (most recent first):
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;
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; <SM10> 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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; <SM9> 9/9/93 pdw Lots of little changes. Name changes, temporary cache_bug
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; stuff.
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; <SM8> 8/13/93 pdw Added InitAMIC routine.
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; <SM7> 8/1/93 pdw Changed moves into bclrs/bsets in order to avoid trashing the
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; undocumented(!) SCSI speed bits.
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; <SM6> 7/17/93 pdw Added this minDMAsize thing.
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; <SM5> 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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; <SM4> 5/5/93 PW Converted names to meanies-friendly names. Updated with latest
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; from Ludwig stuff.
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; <SM3> 3/29/93 PW
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; <1+> 3/20/93 PW Putting DMA out code back in.
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; <1> 3/20/93 PW first checked in
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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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BFR_SIZE EQU 512
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; LOAD 'StandardEqu.d'
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; INCLUDE 'HardwarePrivateEqu.a'
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; INCLUDE 'HardwareEqu.a' ;
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; INCLUDE 'UniversalEqu.a' ; for TestFor
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INCLUDE 'Debug.a' ; for NAME macro
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INCLUDE 'SCSI.a'
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INCLUDE 'SCSIEqu53c96.a'
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INCLUDE 'ACAM.a'
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INCLUDE 'SIMCoreEqu.a'
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INCLUDE 'HALc96equ.a'
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INCLUDE 'AMICequ.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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IMPORT OneByteRead, OneByteWrite
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;;AMIC_SCSIBaseAddr EQU $50F32000
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;;AMIC_SCSIDMAControl EQU $50F32008
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A1_ChanlControl EQU A1 ; used and returned by StartAMIC and used by Stop…
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;--------------------------------------------------------------------------
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InitAMIC PROC EXPORT
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bclr #kbAMICRun, ([HALc96GlobalRecord.dmaCntrlAddr,A5])
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rts
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NAME 'InitAMIC'
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ENDP
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;————————————————————————————————————————————
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StackFrame RECORD {pushedA2},DECR
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;---- parameters ----
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direction ds.w 1 ; direction of transfer (kIn or kOut)
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byteCount ds.l 1 ; number of bytes to transfer
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bufferAddr ds.l 1 ; source/dest buffer for DMA transfer
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;---- mechanics
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returnAddr ds.l 1 ; return address
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pushedA2 ds.l 1
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ENDR
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;————————————————————————————————————————————
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StartAMIC PROC EXPORT
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WITH StackFrame
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move.l A2, -(sp)
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move.l HALc96GlobalRecord.dmaCntrlAddr(A5), A1_ChanlControl
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move.l HALc96GlobalRecord.dmaBaseAddr(A5), A2
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addq.l #3, A2 ; point to last byte
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move.l bufferAddr(sp), D0
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move.b D0, (A2)
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lsr.l #8, D0 ; Shift the base addr right one byte
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move.b D0, -(A2)
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lsr.l #8, D0
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move.b D0, -(A2)
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lsr.l #8, D0
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move.b D0, -(A2)
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nop
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tst.w direction(sp)
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bne.s @reading
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@writing
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bset #kbAMICDirection, (A1_ChanlControl)
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bset #kbAMICRun, (A1_ChanlControl)
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move.l (sp)+, A2
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nop
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rts
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@reading
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bclr #kbAMICDirection, (A1_ChanlControl)
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bset #kbAMICRun, (A1_ChanlControl)
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move.l (sp)+, A2
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nop
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rts
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NAME 'StartAMIC'
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ENDWITH
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ENDPROC
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;--------------------------------------------------------------------------
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Wt4AMICComplete PROC EXPORT
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; _debugger ; there is no such ability on AMIC
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rts
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NAME 'Wt4AMICComplete'
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ENDPROC
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;--------------------------------------------------------------------------
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StopAMICRead PROC EXPORT
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;
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; ———————— On Entry:———————————————————————————————————————————————
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;
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move.l HALc96GlobalRecord.dmaCntrlAddr(A5), A1_ChanlControl
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bclr #kbAMICRun, (A1_ChanlControl)
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bset #kbAMICFlush, (A1_ChanlControl)
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@1 btst #kbAMICFlush, (A1_ChanlControl)
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bne.s @1
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rts
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NAME 'StopAMICRead'
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ENDPROC
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;--------------------------------------------------------------------------
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StopAMICWrite PROC EXPORT
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;
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; ———————— On Entry:———————————————————————————————————————————————
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;
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move.l HALc96GlobalRecord.dmaCntrlAddr(A5), A1_ChanlControl
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bclr #kbAMICRun, (A1_ChanlControl)
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rts
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NAME 'StopAMICWrite'
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ENDPROC
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END
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