633 lines
8.0 KiB
C
633 lines
8.0 KiB
C
#include "rasterirq.h"
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#include <c64/vic.h>
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#include <c64/cia.h>
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#include <c64/asm6502.h>
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#include <stdlib.h>
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volatile char npos = 1, tpos = 0;
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volatile byte rirq_count;
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byte rasterIRQRows[NUM_IRQS + 1];
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byte rasterIRQIndex[NUM_IRQS + 1];
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#ifdef ZPAGE_IRQS
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__zeropage
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#endif
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byte rasterIRQNext[NUM_IRQS + 1];
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byte rasterIRQLow[NUM_IRQS];
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byte rasterIRQHigh[NUM_IRQS];
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#ifdef ZPAGE_IRQS
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__zeropage
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#endif
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byte nextIRQ;
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__asm irq0
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{
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pha
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txa
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pha
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tya
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pha
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asl $d019
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ldx nextIRQ
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l1:
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lda rasterIRQNext, x
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cmp #$ff
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beq e1
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ldy rasterIRQIndex + 1, x
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tax
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lda rasterIRQLow, y
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sta ji + 1
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lda rasterIRQHigh, y
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sta ji + 2
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ji:
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jsr $0000
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inc nextIRQ
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ldx nextIRQ
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lda rasterIRQNext, x
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cmp #$ff
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beq e2
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// carry is cleared at this point
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tay
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dey
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sbc #2
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cmp $d012
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bcc l1
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sty $d012
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ex:
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pla
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tay
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pla
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tax
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pla
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rti
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e2:
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ldx npos
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stx tpos
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inc rirq_count
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bit $d011
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bmi e1
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sta $d012
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jmp ex
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e1:
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ldx #0
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stx nextIRQ
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ldy rasterIRQNext
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dey
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sty $d012
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jmp ex
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}
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__asm irq2
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{
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pha
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txa
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pha
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tya
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pha
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lda $01
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pha
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lda #$35
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sta $01
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asl $d019
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ldx nextIRQ
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l1:
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lda rasterIRQNext, x
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cmp #$ff
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beq e1
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ldy rasterIRQIndex + 1, x
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tax
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lda rasterIRQLow, y
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sta ji + 1
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lda rasterIRQHigh, y
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sta ji + 2
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ji:
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jsr $0000
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inc nextIRQ
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ldx nextIRQ
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lda rasterIRQNext, x
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cmp #$ff
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beq e2
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// carry is cleared at this point
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tay
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dey
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sbc #2
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cmp $d012
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bcc l1
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sty $d012
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ex:
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pla
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sta $01
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pla
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tay
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pla
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tax
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pla
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rti
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e2:
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ldx npos
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stx tpos
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inc rirq_count
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bit $d011
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bmi e1
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sta $d012
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jmp ex
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e1:
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ldx #0
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stx nextIRQ
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ldy rasterIRQNext
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dey
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sty $d012
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jmp ex
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}
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__asm irq1
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{
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lda $d019
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bpl ex2
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ldx nextIRQ
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l1:
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lda rasterIRQNext, x
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cmp #$ff
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beq e1
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ldy rasterIRQIndex + 1, x
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tax
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lda rasterIRQLow, y
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sta ji + 1
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lda rasterIRQHigh, y
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sta ji + 2
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ji:
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jsr $0000
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jx:
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inc nextIRQ
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ldx nextIRQ
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lda rasterIRQNext, x
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cmp #$ff
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beq e2
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tay
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sec
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sbc #4
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cmp $d012
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bcc l1
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dey
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sty $d012
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w1:
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jmp ex
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e2:
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ldx npos
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stx tpos
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inc rirq_count
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bit $d011
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bmi e1
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sta $d012
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jmp ex
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e1:
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ldx #0
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stx nextIRQ
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lda rasterIRQNext, x
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sec
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sbc #1
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sta $d012
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ex:
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asl $d019
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jmp $ea81
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ex2:
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LDA $DC0D
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cli
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jmp $ea31
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}
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__asm irq3
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{
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lda $01
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pha
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lda #$36
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sta $01
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lda $d019
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bpl ex2
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ldx nextIRQ
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l1:
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lda rasterIRQNext, x
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cmp #$ff
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beq e1
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ldy rasterIRQIndex + 1, x
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tax
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lda rasterIRQLow, y
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sta ji + 1
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lda rasterIRQHigh, y
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sta ji + 2
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ji:
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jsr $0000
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jx:
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inc nextIRQ
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ldx nextIRQ
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lda rasterIRQNext, x
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cmp #$ff
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beq e2
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tay
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sec
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sbc #4
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cmp $d012
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bcc l1
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dey
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sty $d012
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w1:
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jmp ex
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e2:
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ldx npos
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stx tpos
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inc rirq_count
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bit $d011
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bmi e1
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sta $d012
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jmp ex
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e1:
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ldx #0
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stx nextIRQ
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lda rasterIRQNext, x
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sec
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sbc #1
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sta $d012
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ex:
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asl $d019
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pla
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sta $01
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jmp $ea81
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ex2:
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LDA $DC0D
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cli
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pla
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sta $01
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jmp $ea31
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}
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// 0 lda #data0
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// 2 ldy #data1
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// 4 cpx $d012
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// 7 bcc -5
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// 9 sta addr0
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// 12 sty addr1
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// 15 lda #data2
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// 17 sta addr2
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// 20 lda #data3
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// 22 sta addr3
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// ...
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// rts
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void rirq_build(RIRQCode * ic, byte size)
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{
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__assume(size < 26);
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ic->size = size;
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asm_im(ic->code + 0, ASM_LDY, 0);
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asm_im(ic->code + 2, ASM_LDA, 0);
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asm_ab(ic->code + 4, ASM_CPX, 0xd012);
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asm_rl(ic->code + 7, ASM_BCS, -5);
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asm_ab(ic->code + 9, ASM_STY, 0x0000);
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if (size == 0)
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{
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asm_np(ic->code + 0, ASM_RTS);
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}
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else if (size == 1)
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{
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asm_np(ic->code + 12, ASM_RTS);
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}
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else
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{
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asm_ab(ic->code + 12, ASM_STA, 0x0000);
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byte p = 15;
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for(byte i=2; i<size; i++)
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{
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p += asm_im(ic->code + p, ASM_LDA, 0x00);
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p += asm_ab(ic->code + p, ASM_STA, 0x0000);
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}
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asm_np(ic->code + p, ASM_RTS);
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}
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}
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RIRQCode * rirq_alloc(byte size)
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{
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RIRQCode * ic = (RIRQCode *)malloc(1 + RIRQ_SIZE + 5 * size);
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rirq_build(ic, size);
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return ic;
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}
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#pragma native(rirq_build)
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void rirq_set(byte n, byte row, RIRQCode * write)
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{
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rasterIRQLow[n] = (unsigned)&write->code & 0xff;
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rasterIRQHigh[n] = (unsigned)&write->code >> 8;
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rasterIRQRows[n] = row;
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}
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static const byte irqai[26] = {
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RIRQ_ADDR_0, RIRQ_ADDR_1, RIRQ_ADDR_2, RIRQ_ADDR_3, RIRQ_ADDR_4, RIRQ_ADDR_5, RIRQ_ADDR_6, RIRQ_ADDR_7,
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RIRQ_ADDR_8, RIRQ_ADDR_9, RIRQ_ADDR_10, RIRQ_ADDR_11, RIRQ_ADDR_12, RIRQ_ADDR_13, RIRQ_ADDR_14, RIRQ_ADDR_15,
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RIRQ_ADDR_16, RIRQ_ADDR_17, RIRQ_ADDR_18, RIRQ_ADDR_19, RIRQ_ADDR_20, RIRQ_ADDR_21, RIRQ_ADDR_22, RIRQ_ADDR_23,
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RIRQ_ADDR_24, RIRQ_ADDR_25
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};
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static const byte irqdi[26] = {
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RIRQ_DATA_0, RIRQ_DATA_1, RIRQ_DATA_2, RIRQ_DATA_3, RIRQ_DATA_4, RIRQ_DATA_5, RIRQ_DATA_6, RIRQ_DATA_7,
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RIRQ_DATA_8, RIRQ_DATA_9, RIRQ_DATA_10, RIRQ_DATA_11, RIRQ_DATA_12, RIRQ_DATA_13, RIRQ_DATA_14, RIRQ_DATA_15,
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RIRQ_DATA_16, RIRQ_DATA_17, RIRQ_DATA_18, RIRQ_DATA_19, RIRQ_DATA_20, RIRQ_DATA_21, RIRQ_DATA_22, RIRQ_DATA_23,
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RIRQ_DATA_24, RIRQ_DATA_25
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};
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void rirq_addr(RIRQCode * ic, byte n, void * addr)
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{
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byte p = irqai[n];
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ic->code[p + 0] = (unsigned)addr & 0xff;
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ic->code[p + 1] = (unsigned)addr >> 8;
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}
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void rirq_addrhi(RIRQCode * ic, byte n, byte hi)
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{
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byte p = irqai[n];
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ic->code[p + 1] = hi;
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}
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void rirq_data(RIRQCode * ic, byte n, byte data)
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{
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byte p = irqdi[n];
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ic->code[p] = data;
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}
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void rirq_write(RIRQCode * ic, byte n, void * addr, byte data)
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{
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byte p = irqai[n];
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ic->code[p + 0] = (unsigned)addr & 0xff;
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ic->code[p + 1] = (unsigned)addr >> 8;
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p = irqdi[n];
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ic->code[p] = data;
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}
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void rirq_call(RIRQCode * ic, byte n, void * addr)
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{
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byte p = irqai[n];
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ic->code[p - 1] = 0x20;
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ic->code[p + 0] = (unsigned)addr & 0xff;
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ic->code[p + 1] = (unsigned)addr >> 8;
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}
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void rirq_delay(RIRQCode * ic, byte cycles)
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{
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ic->code[ 1] = cycles;
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ic->code[ 9] = 0x88; // dey
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ic->code[10] = 0xd0; // bne
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ic->code[11] = 0xfd; // -3
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}
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void rirq_move(byte n, byte row)
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{
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rasterIRQRows[n] = row;
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}
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void rirq_clear(byte n)
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{
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rasterIRQRows[n] = 255;
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}
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void rirq_init_tables(void)
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{
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for(byte i=0; i<NUM_IRQS; i++)
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{
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rasterIRQRows[i] = 255;
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rasterIRQIndex[i + 1] = i;
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}
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rasterIRQIndex[0] = NUM_IRQS;
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rasterIRQRows[NUM_IRQS] = 0;
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rasterIRQNext[NUM_IRQS] = 255;
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}
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void rirq_init_kernal(void)
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{
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rirq_init_tables();
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__asm
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{
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sei
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}
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*(void **)0x0314 = irq1;
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vic.intr_enable = 1;
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vic.ctrl1 &= 0x7f;
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vic.raster = 255;
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}
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void rirq_init_kernal_io(void)
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{
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rirq_init_tables();
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__asm
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{
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sei
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}
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*(void **)0x0314 = irq3;
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vic.intr_enable = 1;
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vic.ctrl1 &= 0x7f;
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vic.raster = 255;
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}
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void rirq_init_io(void)
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{
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rirq_init_tables();
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__asm
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{
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sei
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}
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*(void **)0xfffe = irq0;
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vic.intr_enable = 1;
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vic.ctrl1 &= 0x7f;
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vic.raster = 255;
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}
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void rirq_init_memmap(void)
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{
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rirq_init_tables();
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__asm
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{
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sei
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}
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*(void **)0xfffe = irq2;
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vic.intr_enable = 1;
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vic.ctrl1 &= 0x7f;
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vic.raster = 255;
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}
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void rirq_init(bool kernalIRQ)
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{
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if (kernalIRQ)
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rirq_init_kernal();
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else
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rirq_init_io();
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}
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void rirq_wait(void)
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{
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while (tpos != npos) ;
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npos++;
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}
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void rirq_sort(void)
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{
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#if 1
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byte maxr = rasterIRQRows[rasterIRQIndex[1]];
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for(byte i = 2; i<NUM_IRQS + 1; i++)
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{
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byte ri = rasterIRQIndex[i];
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byte rr = rasterIRQRows[ri];
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if (rr < maxr)
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{
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rasterIRQIndex[i] = rasterIRQIndex[i - 1];
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byte j = i, rj;
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while (rr < rasterIRQRows[(rj = rasterIRQIndex[j - 2])])
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{
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rasterIRQIndex[j - 1] = rj;
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j--;
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}
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rasterIRQIndex[j - 1] = ri;
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}
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else
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maxr = rr;
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}
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#else
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for(byte i = 1; i<NUM_IRQS; i++)
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{
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byte ri = rasterIRQIndex[i];
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byte rr = rasterIRQRows[ri];
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byte j = i, rj;
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while (j > 0 && rr < rasterIRQRows[(rj = rasterIRQIndex[j - 1])])
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{
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rasterIRQIndex[j] = rj;
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j--;
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}
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rasterIRQIndex[j] = ri;
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}
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#endif
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for(sbyte i=NUM_IRQS-1; i>=0; i--)
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rasterIRQNext[i] = rasterIRQRows[rasterIRQIndex[i + 1]];
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npos++;
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byte yp = rasterIRQNext[nextIRQ];
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if (yp != 0xff)
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vic.raster = yp - 1;
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}
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void rirq_start(void)
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{
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__asm
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{
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lda $d011
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and #$7f
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sta $d011
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lda #100
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sta $d012
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cli
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}
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}
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void rirq_stop(void)
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{
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__asm
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{
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sei
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}
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}
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#pragma native(rirq_sort)
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#pragma native(rirq_wait)
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#pragma native(rirq_start)
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#pragma native(rirq_stop)
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