A2osX/SYS/KERNEL.S.GP.txt

PR#3
PREFIX /A2OSX.BUILD
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
*--------------------------------------
* MLICALL (AUXLC to MAINLC)
* Used by Kernel
* In:
*   X = MLI Function
*	A = Param Count
*--------------------------------------
				jmp A2osX.ROMCALL1
*--------------------------------------
* BADCALL
*--------------------------------------
				lda #MLI.ERR.BADCALL
				sec
				rts
*--------------------------------------
				jmp (pDev)				pDevJmp
*--------------------------------------
*     *** MUST BE REINTRANT ***
*--------------------------------------
A2osX.SYSCALL1	bit K.SYSCALL.BANK,x
				bpl	.8					in $E000, no BNK change
				
				sta .7+1				save A		(Func Arg)

				lda K.SYSCALL.BANK,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 (K.SYSCALL.JMP,x)
*--------------------------------------
A2osX.LIBCALL1	pha						No need to save X, K.GetMemPtr.A will leave it unmodified
				tya						Get LIB hMem in A
				jsr K.GetMemPtr.A		Get LIB Code Segment (MemMgr in $E000, no BNK change)
				>STYA .1+1
				pla
.1				jmp $ffff
*--------------------------------------
A2osX.MLICALL1	stx .1
				sta K.MLI.PARAMS
				jsr GO.ProDOS
				jsr MLI
.1				.BS 1
				.DA K.MLI.PARAMS
				jsr GO.A2osX
				rts
*--------------------------------------
A2osX.ROMCALL1	phx
				ldx $D000
				stx .8+1
				
				bit	RROMBNK1
				
				plx
				jsr .1
				
.8				ldx #$ff
				bit $C000,x
				bit $C000,x
				rts
				
.1				jmp (.2,x)
.2				.DA $E7A7				FSUB
				.DA $E7BE				FADD
				.DA $E941				LOG
				.DA $E97F				FMULT
				.DA $EA66				FDIV
				.DA $EAFD				LOAD.FAC.FROM.INDEX
				.DA $EB27				SETFOR
				.DA $EC4A				FIN
				.DA $ED36				FOUT.1
				.DA $EE8D				SQR
				.DA $EE97				FPWRT
				.DA $EF09				EXP
				.DA $EFEA				COS
				.DA $EFF1				SIN
				.DA $F03A				TAN
				.DA $F09E				ATN
*--------------------------------------
GO.DiskII.RW	jsr GO.ProDOS
				stx $42
				sta $43
				
				ldy #3
				
GO.DiskII.RW.1	lda $ffff,y				Self Modified
				sta $44,y
				dey
				bpl GO.DiskII.RW.1
				
				jsr $D000
				cli
				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 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
*--------------------------------------
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
*--------------------------------------
*GO.Reset		jsr GO.A2osX
*				jmp CORE.Run
*--------------------------------------
*BrkHandler		bra *
*--------------------------------------
				.BS $BEE0-*
*--------------------------------------
				.DA #6					60hz
				.BS 7
				.DA #0					ChRoot Disabled
				.BS 7					All Slots marked as "Free"
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.GP
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM