A2osX/SYS/KERNEL.S.GP.txt

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
*--------------------------------------
				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

				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
* `>PUSHL X (long)`
* `>PUSHL Y (long)`
* `>FPU add32`
* `...`
* ## RETURN VALUE
*  On stack (long)
*\--------------------------------------
GP.FpuCall		dec IRQ.InKernel
				cpx #FPU.FMUL
				bcs .1

				jsr MATH				math16 & math32, direct JMP

				inc IRQ.InKernel
				rts

.1				phx
				jsr GP.SetFAC			Get float from stack
				plx
				cpx #FPU.PWR+1
				bcs GP.GetFAC
*/--------------------------------------
* # FAdd,FSub,FMul,FDiv,FPwr
* Return X*Y, X/Y, X+Y, X-Y
* ## C
* `float pwr ( float x, float y);`
* ## ASM
* `>PUSHF X (float)`
* `>PUSHF Y (float)`
* `>FPU fmul`
* `>FPU fdiv`
* `>FPU fmod`							TODO
* `>FPU fadd`
* `>FPU fsub`
* `>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
* `>PUSHF x (Float)`
* `>FPU log`
* ## RETURN VALUE
*  On stack (Float)
*\--------------------------------------
GP.GetFAC		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 MATHF

.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
* `>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.GetFAC
*/--------------------------------------
* # lrintf
* Return float rounded into a long
* ## C
* `long int lrintf (float x);`
* ## ASM
* `>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 SaveSX
				ldx	SaveSM
				txs
				sta CLRALTZP
				bra GO.EXIT

GO.A2osX.BNK	ldx #RRAMWRAMBNK1		Self Modified, initialized to BNK1 for INIT3

				bit $C000,x
*				bit $C000,x
				sta SETALTZP
				tsx
				stx SaveSM
				ldx	SaveSX
				txs
*--------------------------------------
GO.EXIT			pha						push P on stack
GO.EXIT.SaveY	ldy #$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 SaveSM
				ldx	SaveSX
				txs

GP.IRQ.JSR		jsr CORE.IRQ.DEV		SELF MODIFIED

				tsx						go back to Main
				stx SaveSX
				ldx	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 *
*--------------------------------------
* $11D0->$11EF : Public Variables
*--------------------------------------
				.BS 32
*--------------------------------------
* $11F0->$11FF : 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"
*--------------------------------------
MAN
SAVE usr/src/sys/kernel.s.gp
LOAD usr/src/sys/kernel.s
ASM