A2osX/SYS/KERNEL.S.IRQ.txt

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PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
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S.BrkHandlerAuxLC
bra *
*--------------------------------------
* 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.IrqHandlerAuxLC
sta K.IrqMgr.A
pla
pha
and #$10 BRK?
beq .10
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lda K.IrqMgr.A
.82 jmp (K.IrqMgrOldFFFE)
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.10 stx K.IrqMgr.X
sty K.IrqMgr.Y
lda $fe
pha
lda $ff
pha
lda RDREADAUX
pha
sta CLRREADAUX Make sure we can access DevMgr.Table
>LDYAI DevMgr.Table
>STYA $fe
.1 lda ($fe) End Of Table ?
sec
beq .8
ldy #S.DEV.F
lda ($fe),y
and #S.DEV.F.IRQ
beq .2
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jsr K.IrqHandlerJMP
bcc .8 CC, IRQ cleared by device
.2 lda $fe CS,
adc #S.DEV-1
sta $fe
bcc .1
inc $ff
bra .1
.8 pla Must keep Carry
bpl .81
sta SETREADAUX
.81 pla
sta $ff
pla
sta $fe
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ldy K.IrqMgr.Y
ldx K.IrqMgr.X
lda K.IrqMgr.A
bcs .82
rti
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K.IrqHandlerJMP ldx #DEVMGR.IRQ
jmp ($fe)
*--------------------------------------
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K.IrqMgrOldFFFE .BS 2
K.IrqMgr.A .BS 1
K.IrqMgr.X .BS 1
K.IrqMgr.Y .BS 1
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.IRQ
LOAD SYS/KERNEL.S
ASM