A2osX/SYS/KERNEL.S.IRQ.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
* called directly by IRQ Vector $FFFE in AuxLC
* Must keep:
* A,X,Y
* SETREADAUX
* if we are here, Aux ZP/Stack already On
* Exit with RTI
* if A2osX Drivers cannot clear IRQ,
* must call regular System Handler
*--------------------------------------
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K.IrqHAuxLC sta .12+1
pla
pha
and #$10 BRK?
bne .2
stx .11+1
sty .10+1
lda $fe
pha
lda $ff
pha
lda RDREADAUX
pha
sta CLRREADAUX Make sure we can access Dev.Table
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jsr K.IrqH
pla Must keep Carry
bpl .1
sta SETREADAUX
.1 pla
sta $ff
pla
sta $fe
.10 ldy #$ff Self Modified
.11 ldx #$ff Self Modified
.12 lda #$ff Self Modified
bcs .8
rti
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.2 pla pull P
bra *
.8 jmp (IRQ.OldFFFE)
*--------------------------------------
* Called by :
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* - Kernel K.IrqHAuxLC
* - ProDOS IRQ Manager (GP)
*--------------------------------------
K.IrqH jmp K.IrqH.DEV Modified by INIT
*--------------------------------------
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K.IrqH.TCLOCK ldy IRQ.VBL.n0
lda $c080,y
and #$20
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beq K.IrqH.DEV
lda $c080,y
lda $c088,y
inc CORE.IRQTick
clc
rts
*--------------------------------------
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K.IrqH.VBL jsr IRQ.VBL.MSM SERVEMOUSE
bcs K.IrqH.DEV Not From Mouse
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ldx IRQ.VBL.0n
lda $778,x
and #$08 IRQ was caused by VBL ?
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beq K.IrqH.DEV
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ldx IRQ.VBL.MRM+2 $Cn
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ldy IRQ.VBL.n0
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jsr IRQ.VBL.MRM READMOUSE
inc CORE.IRQTick
clc
rts
*--------------------------------------
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K.IrqH.DEV >LDYAI Dev.Table
>STYA $fe
ldx DevMgr.Count
.4 ldy #S.DEV.S
lda ($fe),y
and #S.DEV.S.IRQ
beq .6
phx
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jsr K.IrqHJMP
plx
bcc .8 CC, IRQ cleared by device
.6 lda $fe
clc
adc #S.DEV
sta $fe
bcc .7
inc $ff
.7 dex
bne .4
sec
.8 rts
*--------------------------------------
IRQ.IntNum .BS 1
*--------------------------------------
IRQ.OldFFFE .BS 2
*--------------------------------------
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IRQ.VBL.n0 .BS 1
IRQ.VBL.0n .BS 1
IRQ.VBL.MSM jmp $0000
IRQ.VBL.MRM jmp $0000
*--------------------------------------
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K.IrqHJMP ldx #DEVMGR.IRQ
jmp ($fe)
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.IRQ
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM