mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 16:31:07 +00:00
133 lines
2.7 KiB
Plaintext
133 lines
2.7 KiB
Plaintext
NEW
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AUTO 3,1
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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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MSLOT .EQ $7f8
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*--------------------------------------
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*IRQ.BRK jmp IRQ.6
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*--------------------------------------
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IRQ.Handler cld
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sta IRQ.6+1
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pla
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pha
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and #$10 BRK?
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* bne IRQ.BRK
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bne *
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stx IRQ.5+1
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sty IRQ.4+1
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lda RD80STORE
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and RDPAGE2
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pha
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sta CLRPAGE2
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lda RDREADAUX
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pha
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sta CLRREADAUX Make sure we can access FD.Table
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lda RDWRITEAUX
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pha
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sta CLRWRITEAUX Driver may R/W in screen holes
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lda MSLOT Save MSLOT
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sta IRQ.2+2
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* lda RDCXROM C100-C7ff state
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* pha
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* sta CLRCXROM Enable access to slot C100-C7ff space
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IRQ.JSR jsr CORE.IRQ.DEV SELF MODIFIED
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* ldx #CLRCXROM
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* pla Get CXROM State
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* bpl .3
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* inx X = SETCXROM
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*.3 sta $C000,x
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lda IRQ.2+2 Get back MSLOT
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sta MSLOT
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and #$F0
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eor #$C0 ....mmm...not looking like Cn....
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bne IRQ.3
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sta CLRC8ROM Release $C800
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IRQ.2 lda $ff00 SELF MODIFIED
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IRQ.3 pla Must keep Carry
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bpl .1
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sta SETWRITEAUX
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clv coming for AUX.....cancel switch
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.1 pla
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bpl .2
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sta SETREADAUX
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clv coming for AUX.....cancel switch
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.2 pla
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bpl .3
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sta SETPAGE2
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.3 bvc IRQ.4 if not V, skip task switching
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tsx Check Stack if before "dec IRQ.InKernel"
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cpx #$fc $1ff-PChi-PClo-P = $1fc
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bcs .8 in CORE.Run or CORE.Dispatch
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lda $103,x
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cmp /A2osX.SYSCALL
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bcs .8 we are in kernel GP or LC
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php
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php make room for 2 additional bytes
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tsx
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lda $104,x get RTI PC LO
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bne .4
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dec $105,x adjust RTI PC HI
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.4 dec $104,x back one byte, to make it a "RTS" return adddress
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lda $103,x get IRQ pushed P
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sta $101,x down 2 bytes
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lda #A2osX.SLEEP make a RTI like "jsr A2osX.SLEEP"
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sta $102,x
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lda /A2osX.SLEEP with RTS=PC IRQ-1
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sta $103,x
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.8 clc
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IRQ.4 ldy #$ff Self Modified
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IRQ.5 ldx #$ff Self Modified
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IRQ.6 lda #$ff Self Modified
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bcc IRQ.8
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dec IRQ.Skip Make regular ProDOS IRQ manager skip A2osX
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IRQ.JMP jmp $FFFF SELF MODIFIED Not handled, pass to ProDOS
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IRQ.8 rti
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*--------------------------------------
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MAN
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SAVE usr/src/sys/kernel.s.irq
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LOAD usr/src/sys/kernel.s
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ASM
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