A2osX/SYS/KERNEL.S.GP.txt

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PR#3
PREFIX /A2OSX.SRC
LOMEM $900
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INC 1
AUTO 6
.LIST OFF
*--------------------------------------
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* SYSCALL (AUXLC to AUXLC)
* Used by user & kernel for inter bank Calls
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* In:
* X = SYSfnc.Index
* Y,A = free for Inline param
*--------------------------------------
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jmp A2osX.SYSCALL1
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*--------------------------------------
* LIBCALL (AUXLC to AUXLC)
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* Used by user
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* In:
* Y = LIB.ID
* X = LIBfnc.Index
* A = free for Inline param
*--------------------------------------
jmp A2osX.LIBCALL1
*--------------------------------------
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* MLICALL (AUXLC to MAINLC)
* Used by Kernel
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* In:
* X = MLI Function
* A = Param Count
*--------------------------------------
jmp A2osX.MLICALL1
*--------------------------------------
* BLKCALL (AUXLC to MAINLC)
* Used by Kernel
* In:
* Y,A = Ptr To Param Block
*--------------------------------------
jmp A2osX.BLKCALL1
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*--------------------------------------
* PRTCALL (AUXLC to MAINLC)
* Used by Kernel
* In:
* Y,A = Ptr To Param Block
*--------------------------------------
jmp A2osX.PRTCALL1
*--------------------------------------
.BS $BD10-*
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*--------------------------------------
jmp (pCode) pCodeJmp
jmp (pLib) pLibJmp
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jmp (pDrv) pDrvJmp
jmp (pDev) pDevJmp
.BS $BD20-*
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*--------------------------------------
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GO.Reset jsr GO.A2osX
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jmp K.KernelRun
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*--------------------------------------
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* *** 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.....
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stx .5+1 save X
plx get back Source BNK
bit $C000,x
bit $C000,x
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.5 ldx #$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
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pla
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jmp (pLib)
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*--------------------------------------
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A2osX.MLICALL1 stx .1
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sta MLICALL.PARAMS
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jsr GO.ProDOS
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jsr MLI
.1 .BS 1
.DA MLICALL.PARAMS
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jsr GO.A2osX
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rts
*--------------------------------------
* BLKCALL.PARAMS moved to MainZP/LC
* $42 Command Number
* $43 Unit Number
* $44-$45 Buffer Pointer
* $46-$47 Block Number
*--------------------------------------
A2osX.BLKCALL1 >STYA .2+1 setup device entry point $Cnxx
jsr GO.ProDOS
ldx #5
.1 lda BLKCALL.PARAMS,x
sta $42,x setup ZP in main memory for this block device calll
dex
bpl .1
.2 jsr $ffff
jsr GO.A2osX
rts
*--------------------------------------
* Smartport Call
*--------------------------------------
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A2osX.PRTCALL1 >STYA .1+1
txa
lsr
sta .2
tax
lda A2osX.PRTCALL.Cnt,x
sta PRTCALL.PARAMS
.1 jsr $ffff
.2 .BS 1 CMD
.DA PRTCALL.PARAMS
rts
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A2osX.PRTCALL.Cnt
.HS 03030301030101010404
*--------------------------------------
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GO.ProDOS lda $D000 We re coming from AUXLC, saving bank...
sta GO.A2osX.BNK+1
php
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clc
.HS 2C bit abs
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GO.A2osX php
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sec
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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
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ply
inx
bne .1
iny
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.1 stx GO.EXIT.JMP+1
sty GO.EXIT.JMP+2
ldy pStack
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bcs GO.A2osX.BNK if CS, go AUXLC
bit RRAMWRAMBNK1 Go MAINLC (ProDOS), always BNK1
bit RRAMWRAMBNK1
tsx
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stx A2osX.SaveSX
ldx A2osX.SaveSM
txs
sta CLRALTZP
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bra GO.EXIT
GO.A2osX.BNK ldx #RRAMWRAMBNK1 Self Modified, initialized to BNK1 for INIT3
bit $C000,x
bit $C000,x
sta SETALTZP
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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
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GO.EXIT.JMP jmp $FFFF Self Modified
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*--------------------------------------
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
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*--------------------------------------
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 *
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*--------------------------------------
MAN
SAVE SYS/KERNEL.S.GP
LOAD SYS/KERNEL.S
ASM