A2osX/SYS/KERNEL.S.GP.txt
2016-09-29 08:26:54 +02:00

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PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
* 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 $BE10-*
*--------------------------------------
jmp (pCode) pCodeJmp
jmp (pLib) pLibJmp
jmp (pDrv) pDrvJmp
jmp (pDev) pDevJmp
.BS $BE20-*
*--------------------------------------
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
*--------------------------------------
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
*--------------------------------------
BrkHandler bra *
*--------------------------------------
IrqHandler bra *
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.GP
LOAD SYS/KERNEL.S
ASM