mirror of
https://github.com/A2osX/A2osX.git
synced 2024-06-02 13:41:30 +00:00
228 lines
4.5 KiB
Plaintext
228 lines
4.5 KiB
Plaintext
NEW
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PREFIX /A2OSX.BUILD
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AUTO 4,1
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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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K.IrqHAuxLC.BRK jmp K.IrqHAuxLC.6
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*--------------------------------------
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K.IrqHAuxLC cld
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sec
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sta K.IrqHAuxLC.6+1
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pla
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pha
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and #$10 BRK?
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bne K.IrqHAuxLC.BRK
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stx K.IrqHAuxLC.5+1
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sty K.IrqHAuxLC.4+1
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lda $fe Save 2 bytes in ZP
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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 Dev.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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pha
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lda RDCXROM
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pha
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sta CLRCXROM Enable access to slot C800 space
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K.IrqHAuxLC.JSR jsr K.IrqH.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
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.3 sta $C000,x
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pla Get back MSLOT
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sta MSLOT
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sta K.IrqHAuxLC.2+2
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and #$F0
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eor #$C0 ....mmm...not looking link Cn....
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bne K.IrqHAuxLC.3
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sta $CFFF Release $C800
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K.IrqHAuxLC.2 lda $ff00 SELF MODIFIED
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K.IrqHAuxLC.3 pla Must keep Carry
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bpl .1
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sta SETWRITEAUX
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.1 pla
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bpl .2
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sta SETREADAUX
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.2 pla
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sta $ff
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pla
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sta $fe
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bvc K.IrqHAuxLC.4 if V, skip task switching
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tsx
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txa
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eor #$FC Only LO,HI & P on stack
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beq K.IrqHAuxLC.4 we are in kernel CORE.Run
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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 .3
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dec $105,x adjust RTI PC HI
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.3 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 $103,x
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lda #$A0+'S
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eor SYS.BASL0+37
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sta SYS.BASL0+37
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K.IrqHAuxLC.4 ldy #$ff Self Modified
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K.IrqHAuxLC.5 ldx #$ff Self Modified
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K.IrqHAuxLC.6 lda #$ff Self Modified
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bcc K.IrqHAuxLC.8
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dec IRQ.SkipA2osX Make regular ProDOS IRQ manager skip A2osX
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K.IrqHAuxLC.JMP jmp $FFFF SELF MODIFIED Not handled, pass to ProDOS
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K.IrqHAuxLC.8 rti
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*--------------------------------------
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* Called by :
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* - Kernel K.IrqHAuxLC
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* - ProDOS IRQ Manager (GP)
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*--------------------------------------
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K.IrqH.TCLOCK ldy IRQ.VBL.n0
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lda $c080,y
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and #$20
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beq K.IrqH.DEV
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lda $c080,y
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lda $c088,y
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bra K.IrqH.Switch
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*--------------------------------------
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K.IrqH.VBL
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K.IrqH.VBL.MSM jsr $FFFF SELF MODIFIED,SERVEMOUSE
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bcs K.IrqH.DEV Not From Mouse
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ldx IRQ.VBL.0n
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lda MOUSESTSx,x
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and #MOUSESTSx.INTVBL IRQ was caused by VBL ?
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beq K.IrqH.DEV
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ldx K.IrqH.VBL.MRM+2 $Cn
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ldy IRQ.VBL.n0
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K.IrqH.VBL.MRM jsr $FFFF SELF MODIFIED,READMOUSE
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*--------------------------------------
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K.IrqH.Switch inc IRQ.Tick
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dec CORE.CPUStat
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bne .2
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lda #100
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sta CORE.CPUStat
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stz CORE.InKernelStat
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ldx CORE.PSCount
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.1 stz PS.Table.Stat-1,x
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dex
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bne .1
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.2 lda IRQ.InKernel keep V flag set
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bpl .3
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inc CORE.InKernelStat
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.9 clv
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clc
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rts
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.3 ldx CORE.PSIndex
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inc PS.Table.Stat-1,x
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bit A2osX.F A2osX.F.PMODE .EQ %01000000
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bvc .8
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lda (pPs)
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and #S.PS.F.DOEVENT
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bne .9
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.8 clc exit with V flag set
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rts
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*--------------------------------------
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K.IrqH.DEV >LDYAI Dev.Table
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>STYA $fe
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ldx DevMgr.Count
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.1 ldy #S.DEV.S
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lda ($fe),y
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and #S.DEV.S.IRQ
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beq .2
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phx
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ldx #DEVMGR.IRQ
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jsr .88
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plx
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bcc .8 CC, IRQ cleared by device
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.2 lda $fe
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clc
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adc #S.DEV
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sta $fe
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bcc .3
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inc $ff
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.3 dex
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bne .1
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sec
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.8 clv clear V (no task switching)
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rts
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*--------------------------------------
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.88 jmp ($fe)
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/SYS/KERNEL.S.IRQ
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LOAD /A2OSX.SRC/SYS/KERNEL.S
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ASM
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