A2osX/SYS/KERNEL.S.BIN.txt

PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
* BIN.LoadExeYA
*  in :
*   A = hMem of FilePath (PSTR)
* out :
*   Y,A = MEMPTR	
*   X = hMem of Code Segment
*--------------------------------------
K.LoadEXEYA		>STYA K.LoadEXEYA.Filename
				>SYSCALL PStrUprYA			Y,A unmodified
				jsr MEM.GetMemByNameYA
				bcs K.LoadEXEYA.1		not already loaded

				>STYA ZPPtr1		Save base address
				ldy #S.MEM.REFCNT
				lda (ZPPtr1),y
				inc
				sta (ZPPtr1),y
				
				txa
				jmp K.GetMemPtrA		X=hMem from K.GetMemByNameA
*--------------------------------------				
K.LoadEXEYA.1	>PUSHWI K.S.STAT
				>PUSHW K.LoadEXEYA.Filename
				jsr K.STAT				Look for AUXTYPE
				bcs .9
				
				>LDYA K.S.STAT+S.STAT.P.AUXTYPE
				>STYA BIN.Relocate.Start

				>PUSHYA					Push AUXTYPE
				>PUSHBI 6				S.FILEINFO.TYPE.BIN
				>PUSHBI	SYS.FOpen.R
				>PUSHW K.LoadEXEYA.Filename

				jsr K.LoadFile
.9				bcs .99					Error Loading file

				stx K.LoadEXEYA.hMem		save hMem
				
				pha							YA=CODE+DATA size
				tya
*				clc						CC from bcs .99				

				adc BIN.Relocate.Start			Get AUXTYPE for actual Base Address
				sta BIN.Relocate.End			compute Range End=AUXTYPE+FILELEN
				pla
				adc BIN.Relocate.Start+1
				sta BIN.Relocate.End+1

				txa
				jsr K.GetMemPtrA
				>STYA ZPPtr1				set ZPPtr1 -> Code start

				pha								YA = actual load address
				tya
				sec
				sbc BIN.Relocate.Start
				sta BIN.Relocate.Offset			Offset=ZPPtr1-AUXTYPE
				pla
				sbc BIN.Relocate.Start+1
				sta BIN.Relocate.Offset+1
				
				ldy #H.BIN.CODE.LEN				get Code Len
				lda (ZPPtr1),y
				clc
				adc ZPPtr1
				sta ZPPtr2					Make ZPPtr2 = ZPPtr1 + CodeLen
				iny
				lda (ZPPtr1),y
				adc ZPPtr1+1
				sta ZPPtr2+1
				
				jsr BIN.RelocateEXE
				
				>LDYA K.LoadEXEYA.Filename	get back bin path
				>SYSCALL NewPStrYA			make a copy of this string
				bcs .98
				
				lda K.LoadEXEYA.hMem		Keep X=hMem		
				jsr K.GetMemByIDA			X unmodified
				>STYA ZPPtr1
				
				lda (ZPPtr1) 
				ora #S.MEM.F.CODE		This is a code segment
				sta (ZPPtr1)

				txa						Get Back hMem
				ldy #S.MEM.BIN
				sta (ZPPtr1),y
							
				lda K.LoadEXEYA.hMem		
				tax						return hMEM to Caller...
				jsr K.GetMemPtrA
				clc						...and Y,A=PTR to CS
				rts
				
.98				pha
				lda K.LoadEXEYA.hMem	
				jsr K.FreeMemA			Discard Loaded Code
				pla
				
				sec
.99				rts
*--------------------------------------
K.LoadEXEYA.Filename	.BS 2
K.LoadEXEYA.hMem		.BS 1
*--------------------------------------
* BIN.InstallDRV
*  In:
*   pDrv = .DRV File Loaded Address
* Note:
*  K.LoadEXEYA called from K.LoadDrvYA
*  Already setup correctly pDrv,
*  BIN.Relocate.Start,End
*--------------------------------------
BIN.InstallDRV	ldy #H.BIN.DRV.CODE.O
				lda (pDrv),y
				clc
				adc BIN.Relocate.Start		Advance start From AUXTYPE to AUXTYPE+DRV code offset
				sta BIN.Relocate.Start
				
				iny
				lda (pDrv),y
				adc BIN.Relocate.Start+1
				sta BIN.Relocate.Start+1
				
				lda DevMgr.Free				Offset = Target DRV address-(AUXTYPE+DRV OFFSET)
				sec
				sbc BIN.Relocate.Start
				sta BIN.Relocate.Offset
				
				lda DevMgr.Free+1
				sbc BIN.Relocate.Start+1
				sta BIN.Relocate.Offset+1
				
				lda	BIN.Relocate.End			Compute DRVLen=End-start
				sec
				sbc BIN.Relocate.Start
				sta BIN.InstallDRV.DRVLen
				
				lda BIN.Relocate.End+1
				sbc BIN.Relocate.Start+1
				sta BIN.InstallDRV.DRVLen+1
				
				lda DevMgr.Free
				clc
				adc BIN.InstallDRV.DRVLen
				sta BIN.InstallDRV.DRVEnd
				tay								Save DRVEnd LO
				lda DevMgr.Free+1
				adc BIN.InstallDRV.DRVLen+1		A = DRVEnd HI
				sta BIN.InstallDRV.DRVEnd+1
				
				bcs .9					we crossed $FFFF, out of mem
				
				cpy #DevMgr.HiMem
				sbc /DevMgr.HiMem
				bcs .9					No More Room to load Driver....

				lda DevMgr.Count
				cmp #K.DEV.MAX
				bne .10					No Device Handle Left
				
				lda #DEVMGR.ERROOH
				sec
				rts				
								
.9				lda #DEVMGR.ERROOM
				sec
				rts
				
.10				inc DevMgr.Count

				>SYSCALL GetDevByIDA
				>STYA ZPPtr2		setup Ptr2 to dest HEADER
				
				ldy	#H.BIN.DRV.HEADER.O
				lda (pDrv),y
				clc
				adc pDrv
				sta ZPPtr1
				iny
				lda (pDrv),y
				adc pDrv+1
				sta ZPPtr1+1		set Ptr1 to Src HEADER

				ldy #S.DEV-1
				
.1				lda (ZPPtr1),y		copy header to DevMgr.Table
				sta (ZPPtr2),y
				dey
				bpl .1
			
				ldy #S.DEV.DRV.JMP+1	Setup Main JMP
				lda DevMgr.Free+1
				sta (ZPPtr2),y
				tax
				
				dey
				lda DevMgr.Free
				sta (ZPPtr2),y
				
				sta ZPPtr2			set Ptr2 to Dest CODE
				stx ZPPtr2+1
				
				ldy	#H.BIN.DRV.CODE.O
				lda (pDrv),y
				clc
				adc pDrv
				sta ZPPtr1
				iny
				lda (pDrv),y
				adc pDrv+1
				sta ZPPtr1+1		set Ptr1 to Src CODE

				lda BIN.InstallDRV.DrvLen+1
				eor #$ff
				pha
				lda BIN.InstallDRV.DrvLen
				eor #$ff
				tax
				
				ldy #0
				
.2				inx						Move CODE in LC
				bne .3
				pla
				inc
				beq .4
				pha
				
.3				lda (ZPPtr1),y
				sta (ZPPtr2),y
				iny
				bne .2
				inc ZPPtr1+1
				inc ZPPtr2+1
				bra .2				
							
.4				ldy #H.BIN.DRV.CODE.LEN
				lda DevMgr.Free					Make Ptr1 = code start
				sta ZPPtr1
				clc
				adc (pDrv),y
				sta ZPPtr2
				
				iny
				lda DevMgr.Free+1
				sta ZPPtr1+1
				adc (pDrv),y
				sta ZPPtr2+1				Make ZPPtr2 = ZPPtr1 + CodeLen
				
				jsr BIN.RelocateDRV
				
				>LDYA BIN.InstallDRV.DrvEnd
				>STYA DevMgr.Free

				clc
				rts
*--------------------------------------
BIN.InstallDRV.DrvLen	.BS 2
BIN.InstallDRV.DrvEnd	.BS 2
*--------------------------------------
* BIN.Relocate___ :
*  In :
*  ZPPtr1 = Ptr to Code
*  ZPPtr2 = End Of Code
*--------------------------------------
BIN.Relocate.Start		.BS 2
BIN.Relocate.End		.BS 2
BIN.Relocate.Offset		.BS 2
*--------------------------------------
BIN.RelocateEXE	ldy #H.BIN.HEADER+1
				lda (ZPPtr1),y
				cmp /H.BIN.HEADER.BIN65
				beq .1
				cmp /H.BIN.HEADER.DRV65
				beq .1
				
				lda #SYSMGR.ERRIBIN
				sec
				rts
				
.1				ldy #H.BIN.JMP			relocate Main JMP
				lda (ZPPtr1),y
				clc
				adc BIN.Relocate.Offset
				sta (ZPPtr1),y

				iny
				lda (ZPPtr1),y
				adc BIN.Relocate.Offset+1
				sta (ZPPtr1),y

				ldy #H.BIN.EXE.REL.TABLE	skip Header, CS.SIZE & DS.SIZE... (16 bytes)
		
				.HS 2C					bit abs
*--------------------------------------					
BIN.RelocateDRV	ldy #H.BIN.DRV.REL.TABLE
				
.1				lda (ZPPtr1),y		Start Relocate JMP table
				tax						LO in X
				iny
				ora (ZPPtr1),y		ORA with HI
				beq .2					$0000 = end of table
				
				dey
				txa						get back LO
				clc
				adc BIN.Relocate.Offset
				sta (ZPPtr1),y

				iny
				lda (ZPPtr1),y
				adc BIN.Relocate.Offset+1
				sta (ZPPtr1),y

				iny

				bra .1
*--------------------------------------				
.2				tya						add current offset in Y to Ptr
				
				sec						+ 1 to skip last 00 from beq .2
				
				adc ZPPtr1
				sta ZPPtr1
				bcc .3	
				inc ZPPtr1+1		ZPPtr1=Current Code PTR
				
.3				lda (ZPPtr1)		get OPCODE
				lsr						/2
				tax
				lda BIN.OPCODES,x		get OPCODE definition
				bcs .4					go get LO nibble
				lsr
				lsr						move HI -> LO
				lsr
				lsr
.4				and #$0f				
				
				bit #$8					abs addressing? 
				beq .6					no....
				
				and #7					save Opcode length...
				pha
				
				ldy #1
				lda (ZPPtr1),y		Get LO
				tax						save LO in X
				
				iny						make Y point to HI

				cpx BIN.Relocate.Start
				lda (ZPPtr1),y		Get HI
				sbc BIN.Relocate.Start+1
				bcc .5					addr < BIN.Relocate.Start, out of range
				
				txa						Get back LO
				cpx BIN.Relocate.End
				lda (ZPPtr1),y		Get HI
				sbc BIN.Relocate.End+1
				bcs .5					addr > BIN.Relocate.End, out of range
				
				txa						Get back LO
*				clc						CC from bcs .6
				adc BIN.Relocate.Offset	add Offset to abs address
				dey
				sta (ZPPtr1),y		store relocated addr LO
				iny
				lda (ZPPtr1),y		Get HI
				adc BIN.Relocate.Offset+1
				sta (ZPPtr1),y		store relocated addr HI
				
.5				pla						get back Opcode length...

.6				clc						A = OPCODE length
				adc ZPPtr1
				sta ZPPtr1
				bcc .7
				inc ZPPtr1+1
				
.7				eor ZPPtr2			A = ZPPtr1
				bne .3
				lda ZPPtr1+1
				eor ZPPtr2+1
				bne .3					next opcode....
				
.8				rts
*--------------------------------------
* 65C02 OPCODES
* Bit 3 	: 1 = absolute addressing
* Bit 2-1-0 : opcode + @ length
*--------------------------------------
*					0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F
BIN.OPCODES		.HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3
				.HS B.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3
				.HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3
				.HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3
				.HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.BIN
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM