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116 lines
2.1 KiB
Plaintext
116 lines
2.1 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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* Setup MainLC ($3FE)
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*
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*
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* Setup AuxLC $FFFE->Kernel IRQ Handler
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* if irq not handled, jmp (S.IrqMgrOldFFFE)
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*--------------------------------------
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S.IrqMgrInit >LDYA $FFFE
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cpy #S.IrqHandlerAuxLC
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bne .1
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cmp /S.IrqHandlerAuxLC
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beq .8
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.1 php
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sei
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>STYA S.IrqMgrOldFFFE
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>LDYAI S.IrqHandlerAuxLC
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>STYA $FFFE
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plp
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.8 clc
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.9 rts
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*--------------------------------------
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S.IrqMgrQuit php
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sei
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>LDYA S.IrqMgrOldFFFE
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>STYA $FFFE
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plp
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cli
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.8 rts
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*--------------------------------------
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*--------------------------------------
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* called directly by IRQ Vector $FFFE in AuxLC
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* Must keep:
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* A,X,Y
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* SETREADAUX
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* if we are here, Aux ZP/Stack already On
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* Exit with RTI
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* if A2osX Drivers cannot clear IRQ,
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* must call regular System Handler
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*--------------------------------------
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S.IrqHandlerAuxLC
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sta S.IrqMgr.A
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pla
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pha
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and #$10 BRK?
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beq .10
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lda S.IrqMgr.A
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.82 jmp (S.IrqMgrOldFFFE)
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.10 stx S.IrqMgr.X
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sty S.IrqMgr.Y
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lda $fe
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pha
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lda $ff
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pha
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lda RDREADAUX
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pha
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sta CLRREADAUX Make sure we can access DevMgr.Table
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>LDYAI DevMgr.Table
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>STYA $fe
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.1 lda ($fe) End Of Table ?
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sec
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beq .8
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ldy #S.DEV.F
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lda ($fe),y
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and #S.DEV.F.IRQ
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beq .2
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jsr S.IrqHandlerJMP
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bcc .8 CC, IRQ cleared by device
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.2 lda $fe CS,
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adc #S.DEV.SIZE-1
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sta $fe
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bcc .1
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inc $ff
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bra .1
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.8 pla Must keep Carry
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bpl .81
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sta SETREADAUX
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.81 pla
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sta $ff
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pla
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sta $fe
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ldy S.IrqMgr.Y
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ldx S.IrqMgr.X
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lda S.IrqMgr.A
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bcs .82
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rti
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S.IrqHandlerJMP ldx #DEVMGR.IRQ
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jmp ($fe)
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*--------------------------------------
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S.IrqMgrOldFFFE .BS 2
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S.IrqMgr.A .BS 1
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S.IrqMgr.X .BS 1
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S.IrqMgr.Y .BS 1
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*--------------------------------------
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MAN
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SAVE SYS/KERNEL.S.IRQ
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LOAD SYS/KERNEL.S
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ASM
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