2017-09-20 11:58:54 +00:00
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; Straightforward 68k wrappers for three NanoKernel MPCalls related to EventGroups
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2017-11-18 08:53:08 +00:00
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; How the FE1F trap makes MP calls:
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;
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; 68 reg | input | output
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; -----------------------------------------------
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; D0 | r0/MPCall selector | r3/return value 1
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; A0 | r3/argument 1 | r4/return value 2
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; D1 | r4/argument 2 | r5/return value 3
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; A1 | r5/argument 3 | r6/return value 4
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; pascal OSStatus NKCreateEvent(long return_space, MPEventID *event);
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NKCreateEvent PROC EXPORT
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LINK A6, #0
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MOVEQ.L #49, D0
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DC.W $FE1F ; CALL
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MOVE.L D0, $C(A6) ; return r3;
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MOVE.L $8(A6), D0 ; if(event) *event = r4;
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BEQ.S @NOPTR
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MOVE.L D0, A1
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MOVE.L A0, (A1)
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@NOPTR
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UNLK A6
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MOVE.L (SP)+, A0
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ADDQ #4, SP
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JMP (A0)
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; pascal OSStatus NKSetSWIEvent(long return_space, MPEventID event, long swi);
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NKSetSWIEvent PROC EXPORT
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LINK A6, #0
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MOVE.L $C(A6), A0 ; r3 = event;
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MOVE.L $8(A6), D1 ; r4 = swi;
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MOVEQ.L #54, D0
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DC.W $FE1F ; CALL
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MOVE.L D0, $10(A6) ; return r3;
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UNLK A6
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MOVE.L (SP)+, A0
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ADDQ.L #8, SP
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JMP (A0)
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; pascal OSStatus NKWaitForEvent(MPEventID event, MPEventFlags *flags, Duration duration)
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NKWaitForEvent PROC EXPORT
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LINK A6, #$0
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MOVE.L $8(A6), A1 ; r5 = duration;
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MOVE.L $10(A6), A0 ; r3 = event;
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MOVEQ.L #52, D0
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DC.W $FE1F ; CALL
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MOVE.L D0, $14(A6) ; return r3;
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MOVE.L $C(A6), D0 ; if(flags) *flags = r4;
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BEQ.B @NOPTR
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MOVE.L D0, A1
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MOVE.L A0, (A1)
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@NOPTR
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UNLK A6
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MOVE.L (SP)+, A0
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; DC.W $DEFC, $000C
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OPT NONE ; not sure how this instruction got here!
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ADDA.W #$C, SP
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JMP (A0)
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END
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