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Use deferred VBI instead of immediate VBI. A deferred VBI won't be

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called if the user program has interrupts disabled which makes it
easier to avoid race conditions.
This commit is contained in:
Christian Groessler 2014-01-02 21:45:12 +01:00
parent f091d0b3cd
commit 2ab89621a9
1 changed files with 4 additions and 6 deletions
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10
libsrc/atari/irq.s
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@ -16,11 +16,11 @@
.segment "INIT" .segment "INIT"
initirq: initirq:
lda VVBLKI lda VVBLKD
ldx VVBLKI+1 ldx VVBLKD+1
sta IRQInd+1 sta IRQInd+1
stx IRQInd+2 stx IRQInd+2
lda #6 lda #7
ldy #<IRQStub ldy #<IRQStub
ldx #>IRQStub ldx #>IRQStub
jsr SETVBV jsr SETVBV
@ -31,7 +31,7 @@ initirq:
.code .code
doneirq: doneirq:
lda #6 lda #7
ldy IRQInd+1 ldy IRQInd+1
ldx IRQInd+2 ldx IRQInd+2
jsr SETVBV jsr SETVBV
@ -44,7 +44,6 @@ doneirq:
IRQStub: IRQStub:
cld ; Just to be sure cld ; Just to be sure
.ifdef __ATARIXL__ .ifdef __ATARIXL__
pha
.ifdef CHARGEN_RELOC .ifdef CHARGEN_RELOC
lda CHBAS lda CHBAS
pha pha
@ -64,7 +63,6 @@ IRQStub:
sta CHBAS sta CHBAS
sta CHBASE sta CHBASE
.endif .endif
pla
.endif .endif
jmp IRQInd ; Jump to the saved IRQ vector jmp IRQInd ; Jump to the saved IRQ vector