A2osX/SYS/KERNEL.S.GP.txt

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PR#3
PREFIX /A2OSX.SRC
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
* SYSCALL (AUXLC to AUXLC)
* Used by user & kernel for inter bank Calls
* In:
* X = SYSfnc.Index
* Y,A = free for Inline param
*--------------------------------------
jmp A2osX.SYSCALL1
*--------------------------------------
* LIBCALL (AUXLC to AUXLC)
* Used by user
* In:
* Y = LIB.ID
* X = LIBfnc.Index
* A = free for Inline param
*--------------------------------------
jmp A2osX.LIBCALL1
*--------------------------------------
* MLICALL (AUXLC to MAINLC)
* Used by Kernel
* In:
* X = MLI Function
* A = Param Count
*--------------------------------------
jmp A2osX.MLICALL1
*--------------------------------------
.BS $BD10-*
*--------------------------------------
jmp (pCode) pCodeJmp
jmp (pLib) pLibJmp
jmp (pDrv) pDrvJmp
jmp (pDev) pDevJmp
.BS $BD20-*
*--------------------------------------
GO.Reset jsr GO.A2osX
jmp K.KernelRun
*--------------------------------------
* *** MUST BE REINTRANT ***
*--------------------------------------
A2osX.SYSCALL1 bit KERNEL.SYSCALL.FLAGS,x
bpl .8 in $E000, no BNK change
sta .7+1 save A (Func Arg)
lda KERNEL.SYSCALL.FLAGS+1,x Get Target BNK
cmp $D000 #RRAMWRAMBNK1 or #RRAMWRAMBNK2
beq .7 same as actual BNK...go restore A and JMP
stx .6+1 save X (Func ID)
tax set Target BNK in x
lda $D000 get source BNK
bit $C000,x switch to Target BNK
bit $C000,x
pha
jsr .6 go to kernel.....
stx .5+1 save X
plx get back Source BNK
bit $C000,x
bit $C000,x
.5 ldx #$FF Self Modified
rts Unmodified Carry
.6 ldx #$FF Self Modified
.7 lda #$FF Self Modified
.8 jmp (KERNEL.SYSCALL,x)
*--------------------------------------
A2osX.LIBCALL1 pha No need to save X, K.GetMemPtrA will leave it unmodified
tya Get LIB hMem in A
jsr K.GetMemPtrA Get LIB Code Segment (MemMgr in $E000, no BNK change)
>STYA pLib
pla
jmp (pLib)
*--------------------------------------
A2osX.MLICALL1 stx .1
sta MLICALL.PARAMS
jsr GO.ProDOS
jsr MLI
.1 .BS 1
.DA MLICALL.PARAMS
jsr GO.A2osX
rts
*--------------------------------------
* A2osX.DIIDrv,A2osX.BlkDrv
* X = DEVMGR.cmd
* Y,A = PTR to Params
* pDev -> Dev Header
* $42 Command Number
* $43 Unit Number
* $44-$45 Buffer Pointer
* $46-$47 Block Number
*--------------------------------------
A2osX.DIIDrv .DA A2osX.DIIDrv.S status
.DA A2osX.DIIDrv.RW Read
.DA A2osX.DIIDrv.RW Write
.DA A2osX.DRV.BadCall Format
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
*--------------------------------------
A2osX.DIIDrv.S >LDYAI A2osx.DIIStat
clc
rts
*--------------------------------------
A2osX.DIIDrv.RW jsr A2osX.Blk.GetParam
jsr GO.ProDOS
jsr $D000
jsr GO.A2osX
rts
*--------------------------------------
A2osx.DIIStat .DA #S.DEVSTAT.S.BLOCK+S.DEVSTAT.S.WRITE+S.DEVSTAT.S.READ
.DA 280
.DA #0
>PSTR "Disk II 5.25"
.BS 4
.DA #S.DEVSTAT.TYPE.DISKII
.DA #0
.DA #0,#9
*--------------------------------------
* Generic Blk Device
*--------------------------------------
A2osX.BlkDrv .DA A2osX.BlkDrv.S status
.DA A2osX.BlkDrv.RW
.DA A2osX.BlkDrv.RW
.DA A2osX.BlkDrv.F
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
.DA A2osX.DRV.BadCall
*--------------------------------------
A2osX.BlkDrv.S jsr A2osX.Blk.GetDev
jsr A2osX.BlkDrv.Go
bcs *
stx A2osx.BlkStat+S.DEVSTAT.SIZE
sty A2osx.BlkStat+S.DEVSTAT.SIZE+1
>LDYAI A2osX.BlkStat
clc
rts
*--------------------------------------
A2osX.BlkDrv.RW jsr A2osX.Blk.GetParam
bra A2osX.BlkDrv.Go
*--------------------------------------
A2osX.BlkDrv.F jsr A2osX.Blk.GetDev
A2osX.BlkDrv.Go ldy #S.DEV.ROM.JMP
lda (pDev),y
sta .8+1
iny
lda (pDev),y
sta .8+2
.8 jmp $ffff
*--------------------------------------
A2osX.BlkStat .DA #S.DEVSTAT.S.BLOCK+S.DEVSTAT.S.WRITE+S.DEVSTAT.S.READ
.BS 3
>PSTR "ProDOS Block Dev"
.DA #S.DEVSTAT.TYPE.PRODOS
.DA #0
.DA #0,#9
*--------------------------------------
A2osX.Blk.GetParam
>STYA ZPDRV Get Ptr To ParamList
jsr A2osX.Blk.GetDev
ldy #3
.1 lda (ZPDRV),y
sta $44,y
dey
bpl .1
rts
*--------------------------------------
A2osX.Blk.GetDev
txa
asl
sta $42 CMD
ldy #S.DEV.DEVID Drive 1, or 2
lda (pDev),y
dec O or 1
lsr in Carry
php
ldy #S.DEV.BUSID
lda (pDev),y
asl
asl
asl
asl
asl
plp
ror
sta $43 DSSS0000
rts
*--------------------------------------
A2osX.DRV.BadCall
lda #MLI.ERR.BADCALL
sec
rts
*--------------------------------------
GO.ProDOS lda $D000 We re coming from AUXLC, saving bank...
sta GO.A2osX.BNK+1
php
clc
.HS 2C bit abs
GO.A2osX php
sec
sei
sta A2osX.SaveA
stx A2osX.SaveX
sty A2osX.SaveY
pla Restore P in A for later
plx Get PC and add 1 for return
ply
inx
bne .1
iny
.1 stx GO.EXIT.JMP+1
sty GO.EXIT.JMP+2
ldy pStack
bcs GO.A2osX.BNK if CS, go AUXLC
bit RRAMWRAMBNK1 Go MAINLC (ProDOS), always BNK1
bit RRAMWRAMBNK1
tsx
stx A2osX.SaveSX
ldx A2osX.SaveSM
txs
sta CLRALTZP
bra GO.EXIT
GO.A2osX.BNK ldx #RRAMWRAMBNK1 Self Modified, initialized to BNK1 for INIT3
bit $C000,x
bit $C000,x
sta SETALTZP
tsx
stx A2osX.SaveSM
ldx A2osX.SaveSX
txs
*--------------------------------------
GO.EXIT sty pStack
pha push P on stack
ldy A2osX.SaveY
ldx A2osX.SaveX
lda A2osX.SaveA
plp
GO.EXIT.JMP jmp $FFFF Self Modified
*--------------------------------------
A2osX.SaveA .BS 1
A2osX.SaveX .BS 1
A2osX.SaveY .BS 1
*--------------------------------------
* Called for ProDOS IRQ Manager (LCBNK1)
* A,X,Y, $FA->$FF Already Saved
* Main RAM,ZP/LC selected
* must begin with CLD
* must exit with RTS
* - CC if IRQ cleared, CS if NOT
*--------------------------------------
ProDOS.INTNUM .BS 1
*--------------------------------------
IrqHandler cld
lda RDALTZP
sta .2+1
bmi .1 we are already in AuxZP/LC
sta SETALTZP coming from MainLC, switch to aux
tsx
stx A2osX.SaveSM
ldx A2osX.SaveSX
txs
.1 jsr K.IrqHandler
.2 lda #$ff get back ZP status when called
bmi .3 we were coming from AuxZP/LC
tsx go back to Main
stx A2osX.SaveSX
ldx A2osX.SaveSM
txs
sta CLRALTZP
.3 rts
*--------------------------------------
BrkHandler bra *
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.GP
LOAD SYS/KERNEL.S
ASM