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A2osX/SYS/KERNEL.S.GP.txt
Rémy GIBERT 2c946c431e Kernel 0.94+
2021-01-12 22:14:13 +01:00

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NEW
AUTO 3,1
*--------------------------------------
* SYSCALL (AUXLC to AUXLC)
* Used by user & kernel for inter bank Calls
* In:
* X = SYSfnc.Index
* Y,A = free for Inline param
*--------------------------------------
GP.CodeStart jmp GP.SysCall
*--------------------------------------
* LIBCALL (AUXLC to AUXLC)
* Used by user
* In:
* Y = LIB.ID
* X = LIBfnc.Index
* A = free for Inline param
*--------------------------------------
jmp GP.LibCall
*--------------------------------------
* AppleTalk MLICALL (AUXLC to MAINLC)
* Used by user
* In:
* Y,A = Params
*--------------------------------------
jmp GP.AtkCall
*--------------------------------------
* ROMCALL (AUXLC to ROMLC)
* Used by Kernel
* In:
* X = ROM Function
* Y,A = Param
*--------------------------------------
jmp GP.FpuCall
*--------------------------------------
* BADCALL
*--------------------------------------
lda #MLI.E.BADCALL
sec
rts
*--------------------------------------
* SLEEP
*--------------------------------------
GP.Sleep php
sei
phy
ldy #S.PS.A
sta (pPS),y
txa
iny #S.PS.X
sta (pPS),y
pla
iny #S.PS.Y
sta (pPS),y
pla
iny #S.PS.P
sta (pPS),y
pla get PC LO
plx get PC HI
inc Advance one byte because of return by RTI
bne GP.Sleep2
inx
GP.Sleep2 ldy #S.PS.PC
sta (pPS),y
txa
iny #S.PS.PC+1
sta (pPS),y
tsx
inx
inx keep PC HI,LO from KERNEL jsr PSExec/PSResume
inx Stack Ptr is $1ff if empty
txa
beq .3
tay Save !Byte count for later
.2 pla
>PUSHA
inx
bne .2
tya
.3 >PUSHA push CPU Stack BC to restore on top of Soft Stack
inc $1fe PC=PC+1
bne .4
inc $1ff because of RTI
.4 lda (pPS)
ora #S.PS.F.SLEEP
sta (pPS)
lda #0 cld,clc,cli
pha
rti exit to kernel with CC
*--------------------------------------
* *** MUST BE REINTRANT ***
*--------------------------------------
GP.SysCall dec IRQ.InKernel
pha
phy
ldy #S.PS.A
sta (pPS),y
txa
iny #S.PS.X
sta (pPS),y
pla
iny #S.PS.Y
sta (pPS),y
tay
pla
jsr K.SYSCALL2
bcc .2 no error quit...
tax CS,A=0 ?
beq .3 Yes, BLOCKING I/O
.2 inc IRQ.InKernel
rts Unmodified Carry
.3 sei
inc IRQ.InKernel
GO.Sleep2 pla get PC LO
plx get PC HI
* sec
sbc #2
bcs GP.Sleep2
dex
.1 bra GP.Sleep2
*--------------------------------------
GP.LibCall dec IRQ.InLib
pha
phy
ldy #S.PS.A
sta (pPS),y
txa
iny #S.PS.X
sta (pPS),y
pla
iny #S.PS.Y
sta (pPS),y
jsr K.GetMemPtr Get LIB Code Segment (MemMgr in $E000, no BNK change)
>STYA .1+1
pla
.1 jsr $FFFF SELF MODIFIED
bcc .2
tax
beq .3
.2 inc IRQ.InLib
rts
.3 sei
inc IRQ.InLib
bra GO.Sleep2
*--------------------------------------
GP.AtkCall dec IRQ.InKernel
>STYA .1
jsr GO.ProDOS
jsr MLI
.DA #MLIATALK
.1 .DA *
jsr GO.A2osX
GP.AtkCall.INC inc IRQ.InKernel
rts
*/--------------------------------------
* # Add32,Sub32,Mul32,IMul32,Div32,IDiv32,Mod32,IMod32,Cmp32,ICmp32
* Return X+Y, X-Y, X*Y, X/Y, X mod Y....
* ## ASM
* **In:**
* `>PUSHL X (long)`
* `>PUSHL Y (long)`
* `>FPU add32`
* `...`
* ## RETURN VALUE
* On stack (long)
*\--------------------------------------
GP.FpuCall dec IRQ.InKernel
cpx #FPU.FADD
bcs .1
jsr MATH32 INT32, direct JMP
bra GP.AtkCall.INC
.1 phx
jsr GP.SetFAC Get float from stack
plx
cpx #FPU.PWR+1
bcs GP.RomCallGetFacOnStack
*/--------------------------------------
* # FAdd,FSub,FMult,FDiv,FPwr
* Return X+Y, X-Y, X*Y, X/Y, X^Y
* ## ASM
* **In:**
* `>PUSHF X (float)`
* `>PUSHF Y (float)`
* `>FPU fadd`
* `>FPU fsub`
* `>FPU fmult`
* `>FPU fdiv`
* `>FPU fpwr`
* ## RETURN VALUE
* On stack (float)
*\--------------------------------------
lda pStack
clc
adc #5
sta pStack
phx
jsr GP.SetARG
plx
*/--------------------------------------
* # Log,Sqr,Exp,Cos,Sin,Tan,ATan
* Return Log(x), Sqr(x), E^X, Cos(x), Sin(X), Tan(x), ATan(x)
* ## C
* `float log ( float x);`
* `float sqr ( float x);`
* `float exp ( float x);`
* `float cos ( float x);`
* `float sin ( float x);`
* `float tan ( float x);`
* `float atan ( float x);`
* ## ASM
* **In:**
* `>PUSHF x (Float)`
* `>FPU log`
* ## RETURN VALUE
* On stack (Float)
*\--------------------------------------
GP.RomCallGetFacOnStack
jsr GP.ROMCALL
lda pStack
ldy pStack+1
sta FORPNT Ptr to dst buffer
sty FORPNT+1
ldx #FPU.GETFAC
*--------------------------------------
GP.RomCall phx
ldx $D000
stx .8+1
bit RROMBNK1
plx
jsr GP.RomCall.JmpX
.8 ldx #$ff
bit $C000,x
bit $C000,x
rts
*--------------------------------------
GP.SetARG ldx #FPU.SETARG
.HS 2C BIT ABS
GP.SetFAC ldx #FPU.SETFAC
lda pStack
ldy pStack+1
bra GP.RomCall
*/--------------------------------------
* # float
* Return 'floated' long
* ## C
* `float f = (float)l;
* ## ASM
* **In:**
* `>PUSHL l` (long)
* `>FPU float`
* ## RETURN VALUE
* On stack (float)
*\--------------------------------------
GP.Float ldy #3
.1 lda (pStack),y
sta FAC+1,y Reverse Order
dey
bpl .1
dec pStack keep 5 bytes on stack
stz FAC.SIGN
lda #$80+32
sta FAC Positive + Exp=32
ldx #FPU.LTOF
bra GP.RomCallGetFacOnStack
*/--------------------------------------
* # lrintf
* Return float rounded into a long
* ## C
* `long int lrintf (float x);`
* ## ASM
* **In:**
* `>PUSHF x`
* `>FPU lrintf`
* ## RETURN VALUE
* On stack (long)
*\--------------------------------------
GP.lrintf jsr GP.SetFAC
inc pStack keep 4 bytes on stack
ldx #FPU.QINT
jsr GP.ROMCALL
ldy #3
.1 lda FAC+1,y
sta (pStack),y
dey
bpl .1
rts
*--------------------------------------
* MLI : From Kernel Aux LC to Main LC
*--------------------------------------
GP.MLICall stx .1
sta K.MLI.PARAMS
jsr GO.ProDOS
jsr MLI
.1 .BS 1
.DA K.MLI.PARAMS
jsr GO.A2osX
rts
*--------------------------------------
GO.ProDOS pha
lda $D000 We re coming from AUXLC, saving bank...
sta GO.A2osX.BNK+1
pla
php
clc
.HS 2C bit abs
GO.A2osX php
sec
sei
sta GO.EXIT.SaveA+1
stx GO.EXIT.SaveX+1
sty GO.EXIT.SaveY+1
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
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 $C000,x
sta SETALTZP
tsx
stx A2osX.SaveSM
ldx A2osX.SaveSX
txs
*--------------------------------------
GO.EXIT pha push P on stack
GO.EXIT.SaveY ldy #$ff
GO.EXIT.SaveX ldx #$ff
GO.EXIT.SaveA lda #$ff
plp
GO.EXIT.JMP jmp $FFFF SELF MODIFIED
*--------------------------------------
* Called from 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
*--------------------------------------
GP.IRQ cld
bit IRQ.Skip After A2osX IRQ.H ?
bmi GP.IRQ.Exit
sta SETALTZP switch to aux LC
tsx
stx A2osX.SaveSM
ldx A2osX.SaveSX
txs
GP.IRQ.JSR jsr CORE.IRQ.DEV SELF MODIFIED
tsx go back to Main
stx A2osX.SaveSX
ldx A2osX.SaveSM
txs
sta CLRALTZP
rts
GP.IRQ.Exit stz IRQ.Skip reset flag
sec
rts
*--------------------------------------
*GO.Reset jsr GO.A2osX
* jmp CORE.Run
*--------------------------------------
*BrkHandler bra *
*--------------------------------------
GP.CodeEnd .BS $BED0-*
*--------------------------------------
* $BED0->$BEEF : Public Variables
*--------------------------------------
.BS 32
*--------------------------------------
* $BEF0->$BEFF : Kernel Config Block
*--------------------------------------
.DA #6 A2osX.HZ=60hz
.DA #2 A2osX.TTYDEVS=2
.HS 000000000000
.DA #0 ChRoot/Preemptive Disabled
.HS 00000000000000 All Slots marked as "Free"
*--------------------------------------
GP.End .EQ *
MAN
SAVE usr/src/sys/kernel.s.gp
LOAD usr/src/sys/kernel.s
ASM
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