A2osX/SYS/KERNEL.S.IO.txt

NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
*/--------------------------------------
* # open
* ## C
* `hFD open(const char *pathname, short int flags);`
* ## ASM
* **In:**
* `>PUSHB flags`
* `>LDYA pathname`
* `>SYSCALL open`
* ## RETURN VALUE
* A = hFD
* REG File created on ProDOS : T=TXT,X=$0000
*\--------------------------------------
K.Open.FLAGS	.BS 1
K.Open.TYPE		.BS 1
K.Open.AUXTYPE	.BS 2
*--------------------------------------		
K.Open			>PULLB K.Open.FLAGS

				lda #S.FI.T.TXT
				sta K.Open.TYPE
				stz K.Open.AUXTYPE
				stz K.Open.AUXTYPE+1
				
IO.Open.I		ldx #5					$/DEV/ 
				cpx K.MLI.PATH
				bcs IO.OPEN.REG			
				
.1				lda K.MLI.PATH,x
				cmp IO.DEVDIR,x
				bne IO.OPEN.REG
				dex
				bne .1
*--------------------------------------		
* /DEV/xxxxxx (CDEV,BDEV,DSOCK,SSOCK,PIPE)
*--------------------------------------		
				>LDYAI K.MLI.PATH+6		skip $/DEV/
	
				jsr K.GetDevByName
				bcc .7
				
				ldx #0
				
.10				lda Nod.Table.hPath,x
				beq .6
				jsr K.GetMemPtr
				>STYA ZPPtr1
				
				ldy #0
				
.2				lda (ZPPtr1),y
				iny
				cmp K.MLI.PATH,y
				bne .6
				cmp #0					end of string ?
				bne .2
				
				txa						return hFILE
				clc
				rts
				
.6				inx
				cpx #K.NOD.MAX
				bne .10
				
				lda #MLI.E.NODEV
*				sec				
				rts						no OF found
				
.7				>STYA pFD
				phx						DEVID/hFILE
				
				lda (pFD)				#S.FD.T
				tax
				pla
				jmp (.8,x)
				
.8				.DA STDIO.IOERR			REG
				.DA STDIO.IOERR			DIR
				.DA IO.OPEN.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA IO.OPEN.DSOCK
				.DA IO.OPEN.SSOCK
				.DA IO.OPEN.PIPE
IO.OPEN.9		sec
IO.OPEN.RTS		rts				
*--------------------------------------
IO.OPEN.REG		>MLICALL MLIGETFILEINFO
				bcc K.IO.OPEN.REG.E		Already Exists
				
				bit K.Open.FLAGS		Create if not exists ?
				bpl IO.OPEN.9			No, return MLI error
				
				lda #S.FI.A.FULL				Yes, Create...
				sta K.MLI.PARAMS+3		Access
				
				ldx #2
				
.1				lda K.Open.TYPE,x
				sta K.MLI.PARAMS+4,x	File type,Aux type
				dex
				bpl .1

				lda #S.FI.ST.STD
				sta K.MLI.PARAMS+7
				
				ldx #3
				
.2				lda DATELO,x
				sta K.MLI.PARAMS+8,x
				dex
				bpl .2

				>MLICALL MLICREATE
				bcs IO.OPEN.RTS

K.IO.OPEN.REG.E	>LDYAI S.FD.REG
				ldx #S.MEM.F.INIT0+S.MEM.F.FD
				jsr MEM.GetMem.YAX
				bcs IO.OPEN.RTS
				
				>STYA pFD
				stx .8+1				save hFD			
								
*				ldy #S.FD.T				Done by GetMem0
*				lda #S.FD.T.REG
*				sta (pFD),y
				
				jsr STDIO.SetIOBUF
				bcs .9

				>MLICALL MLIOPEN
				bcs .9
				
				lda K.MLI.PARAMS+5		get ref_num
				ldy #S.FD.REG.REF
				sta (pFD),y
				
				sta K.MLI.PARAMS+1		Next MLI Calls are REF_NUM based
				
				lda K.Open.FLAGS
				bit #O.WRONLY
				beq .20					Write mode ?
				
				and #O.APPEND			Append ?
				bne .11					yes, go to end of file
				
				stz K.MLI.PARAMS+2
				stz K.MLI.PARAMS+3
				stz K.MLI.PARAMS+4
				>MLICALL MLISETEOF		no, reset size to 0
				bra .21
				
.11				>MLICALL MLIGETEOF
				bcs .9
				
				>MLICALL MLISETMARK
.21				bcs .9
				
.20				lda K.Open.FLAGS
				and #O.TEXT				Text Mode ?
				beq .8
				
				lda #$FF
				sta K.MLI.PARAMS+2
				lda #C.CR
				sta K.MLI.PARAMS+3
				>MLICALL MLINEWLINE
				bcs .9
				
.8				lda #$ff				SELF MODIFIED
				rts

.9				pha						Save Error Code
				lda .8+1
				jsr K.Close
				pla
				sec
				rts
*--------------------------------------
IO.OPEN.CDEV	sta .1+1				A=DEVID
				pha
				jsr K.IOCTL.GetPDrv
				
				ldx #IOCTL.OPEN
				pla						pass A=DEVID To Driver
				jsr K.IOCTL.pDrvJmp
				bcs .9
				
.1				ldx #$ff				SELF MODIFIED
				lda Dev.Table.hFD,x
.9				rts				
*--------------------------------------
IO.OPEN.DSOCK
*--------------------------------------
IO.OPEN.SSOCK
*--------------------------------------
IO.OPEN.PIPE
				clc
				rts
*/--------------------------------------
* # close
* ## C
* `int close(hFD fd);`
* ## ASM
* **In:**
* `lda fd`
* `>SYSCALL close`
*\--------------------------------------
K.Close			pha						save hFD
				jsr K.GetMemPtr
				>STYA pFD

				lda (pFD)				#S.FD.T
				tax
				pla
				jmp (.1,x)
				
.1				.DA IO.CLOSE.REG
				.DA IO.CLOSE.DIR
				.DA IO.CLOSE.CDEV
				.DA IO.CLOSE.BDEV
				.DA STDIO.IOERR			LNK
				.DA IO.CLOSE.DSOCK
				.DA IO.CLOSE.SSOCK
				.DA IO.CLOSE.PIPE
*--------------------------------------
IO.CLOSE.REG
IO.CLOSE.DIR	pha						save hFD
				ldy #S.FD.REG.REF
				lda (pFD),y
				beq .1
				sta K.MLI.PARAMS+1
				>MLICALL MLICLOSE

.1				ldy #S.FD.REG.IOBUF
				lda (pFD),y
				beq .2
				
				jsr K.FreeMem
				
.2				pla
				jmp K.FreeMem
*--------------------------------------
IO.CLOSE.CDEV
IO.CLOSE.BDEV
*--------------------------------------
IO.CLOSE.DSOCK
IO.CLOSE.SSOCK
*--------------------------------------
IO.CLOSE.PIPE	clc
				rts
*/--------------------------------------
* # read
* ## C
* `int read(hFD fd, void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>SYSCALL read`
* ## RETURN VALUE
* CC: Y,A = bytes read
* CS: A = EC
*\--------------------------------------
K.Read			jsr K.GetMemPtr
				>STYA pFD
				
IO.Read.I		lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.READ.REG
				.DA STDIO.IOERR			DIR
				.DA IO.READ.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA STDIO.IOERR			DSOCK
				.DA IO.READ.SSOCK
				.DA IO.READ.PIPE
*/--------------------------------------
* # write
* ## C
* `int write(hFD fd, const void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>SYSCALL write`
* ## RETURN VALUE
* CC: Y,A = bytes written
* CS: A = EC
*\--------------------------------------
K.Write			jsr K.GetMemPtr
				>STYA pFD

IO.Write.I		lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.WRITE.REG
				.DA STDIO.IOERR			DIR
				.DA IO.WRITE.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA STDIO.IOERR			DSOCK
				.DA IO.WRITE.SSOCK
				.DA IO.WRITE.PIPE
*--------------------------------------
IO.READ.REG		ldx #MLIREAD
				.HS 2C					BIT ABS
*--------------------------------------
IO.WRITE.REG	ldx #MLIWRITE

				ldy #S.FD.REG.REF
				lda (pFD),y
				sta K.MLI.PARAMS+1
				>PULLW K.MLI.PARAMS+2
				>PULLW K.MLI.PARAMS+4

				lda #4					Param Count = 4 for MLIREAD & MLIWRITE
				jsr GP.MLICall
				bcs .9
				>LDYA K.MLI.PARAMS+6
.9				rts
*--------------------------------------
IO.READ.CDEV	ldx #IOCTL.READ
				.HS 2C					BIT ABS
*--------------------------------------
IO.WRITE.CDEV	ldx #IOCTL.WRITE

				>PULLW K.S.IOCTL+S.IOCTL.BUFPTR
				>PULLW K.S.IOCTL+S.IOCTL.BYTECNT
				
				jsr K.IOCTL.GetPDRV
				
				>LDYAI K.S.IOCTL
				
.1				jsr K.IOCTL.pDrvJmp
				bcs .9
				>LDYA K.S.IOCTL+S.IOCTL.BYTECNT
.9				rts
*--------------------------------------
IO.WRITE.SSOCK	ldy #S.FD.SSOCK.WRITE
				.HS 2C					BIT ABS
*--------------------------------------
IO.READ.SSOCK	ldy #S.FD.SSOCK.READ

				lda (pFD),y
				tax						Function Offset in LIB

				ldy #S.FD.HANDLER
				lda (pFD),y
				jsr K.GetMemPtr
				>STYA .1
				
				ldy #S.FD.SSOCK.HSKT
				lda (pFD),y
				
.1				jmp $ffff
*--------------------------------------
IO.READ.PIPE	>PULLW K.S.IOCTL+S.IOCTL.BUFPTR
				>PULLW K.S.IOCTL+S.IOCTL.BYTECNT

				ldy #S.FD.PIPE.S
				lda (pFD),y
				bit #S.FD.PIPE.S.WOpened
				beq .9					Remote PS did not opened yet the pipe
				bit #S.FD.PIPE.S.WClosed
				beq .99					Remote PS closed the Pipe
				
				ldy #S.FD.PIPE.hMem
				lda (pFD),y
				jsr K.GetMemPtr

				clc
				rts

.9				lda #MLI.E.VOLFULL
				sec
				rts
.99				lda #MLI.E.EOF
				sec
				rts					
*--------------------------------------
IO.WRITE.PIPE	>PULLW K.S.IOCTL+S.IOCTL.BUFPTR
				>PULLW K.S.IOCTL+S.IOCTL.BYTECNT

				ldy #S.FD.PIPE.S
				lda (pFD),y
				bit #S.FD.PIPE.S.ROpened
				beq .9					Remote PS did not opened yet the pipe
				bit #S.FD.PIPE.S.RClosed
				beq .99					Remote PS closed the Pipe
				
				ldy #S.FD.PIPE.hMem
				lda (pFD),y
				jsr K.GetMemPtr
				>STYA .1+2
				
				ldy #S.FD.PIPE.Head
				lda (pFD),y
				inc
				dey						#S.FD.PIPE.Tail	
				cmp (pFD),y
				beq .9					PIPE is full
				iny
				sta (pFD),y
				tay
				lda K.IOBuf
.1				sta $ffff,y
				clc
				rts
				
.9				lda #MLI.E.VOLFULL
				sec
				rts
.99				lda #MLI.E.EOF
				sec
				rts	
*/--------------------------------------
* # IOCTL
* ## C
* `int ioctl(short int hFD, int request, void * param );`
* ## ASM
* `PUSHWI param`
* `PUSHBI request`
* `lda hFD`
* `>SYSCALL IOCTL`
* ## RETURN VALUE
*  Y,A = ...
*\--------------------------------------
K.IOCTL			jsr K.GetMemPtr
				bcs K.IOCTL.9
				
				>STYA pFD
				
				jsr K.IOCTL.GetPDrv
				
				>PULLA
				tax						request
				
				>PULLYA					param

K.IOCTL.pDrvJmp	jmp (pDrv)
				
K.IOCTL.9		lda #MLI.E.NODEV
				>RET 3
*--------------------------------------
K.IOCTL.GetPDrv	ldy #S.FD.DEV.DRVPTR
				lda (pFD),y
				sta pDRV
				iny
				lda (pFD),y
				sta pDRV+1
				rts
*/--------------------------------------
* # pipe
* ## C
* `int pipe(int pipefd[2]);`
* ## ASM
*\--------------------------------------
K.Pipe
.9				sec
				rts				
*--------------------------------------
IO.DEVDIR		>PSTR "/DEV/"
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.IO
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM