A2osX/SYS/KERNEL.S.IO.txt

NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
*/--------------------------------------
* # open
* ## C
* `int open(const char *pathname, int flags);`
* ## ASM
* **In:**
* `>PUSHB flags`
* `>LDYA pathname`
* `>SYSCALL open`
* **Out:**
* A = hFD
* note : if file is created on ProDOS : T=TXT,X=$0000
*\--------------------------------------
K.Open			jsr PFT.CheckPathYA		check if not /mnt

K.Open.I		jsr IO.SetMLIPathYA		local pathname...

				ldx #5					/DEV/ 
				cpx K.MLI.PATH
				bcs K.Open.REG
				
.1				lda K.MLI.PATH,x
				cmp IO.DEVDIR,x
				bne K.Open.REG
				dex
				bne .1
				
K.Open.DEV		ldy #K.MLI.PATH+6		skip L/DEV/
				lda /K.MLI.PATH+6
	
				jsr K.GetDevByName
				bcs .9
				
				>STYA pFD
				stx .8+1				DEVID
				
				ldy #S.FD.DEV.DRVPTR
				lda (pFD),y
				sta .1+1
				iny
				lda (pFD),y
				sta .1+2
				
				>PULLA					get flags
				ldx #IOCTL.OPEN
.1				jsr $ffff				SELF MODIFIED			
				bcs .99
				
.8				lda #$ff				SELF MODIFIED
.99				rts				
				
.9				>RET 1					discard flags			
	
K.Open.REG		>LDYAI K.MLI.PATH
				>STYA K.MLI.PARAMS+1
				
				lda (pStack)
*				sta K.S.IOCTL

				>RET 1
*--------------------------------------
* int close(int fd);
*--------------------------------------
K.Close			jsr K.GetMemPtr
				>STYA pFD

				lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.CLOSE.REG
				.DA STDIO.IOERR			DIR
				.DA IO.CLOSE.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA STDIO.IOERR			DSOCK
				.DA IO.CLOSE.SSOCK
				.DA IO.CLOSE.FIFO
*--------------------------------------
IO.CLOSE.REG
*--------------------------------------
IO.CLOSE.CDEV
*--------------------------------------
IO.CLOSE.SSOCK
*--------------------------------------
IO.CLOSE.FIFO
*--------------------------------------
* int read(int fd, void *buf, size_t count);
*--------------------------------------
K.Read
*--------------------------------------
* int write(int fd, const void *buf, size_t count);
*--------------------------------------
K.Write			jsr K.GetMemPtr
				>STYA pFD
				
				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.FIFO
*--------------------------------------
IO.WRITE.REG	>PUSHW K.S.IOCTL+S.IOCTL.BUFPTR
				>PUSHW K.S.IOCTL+S.IOCTL.BYTECNT
				ldy #S.FD.REG.REF
				>PUSHB (pFD),y

				jmp K.FWrite
*--------------------------------------
IO.WRITE.CDEV	ldy #S.FD.DEV.DRVPTR
				lda (pFD),y
				sta .1+1
				iny
				lda (pFD),y
				sta .1+2
				
				lda K.IOBuf
				ldx #IOCTL.WRITE
.1				jmp $ffff
*--------------------------------------
IO.WRITE.SSOCK	lda (pFD)				#S.FD.HANDLER
				jsr K.GetMemPtr
				>STYA .1
				
				ldy #S.FD.SSOCK.HSKT
				>PUSHB (pFD),y
				>PUSHB K.IOBuf
				
				ldy #S.FD.SSOCK.WRITE
				lda (pFD),y
				tax						Function Offset for write
.1				jmp $ffff
*--------------------------------------
IO.WRITE.FIFO	ldy #S.FD.FIFO.S
				lda (pFD),y
				beq .9					Remote PS did not opened yet the pipe
				cmp #S.FD.FIFO.S.Closed
				beq .99					Remote PS closed the Pipe
				
				ldy #S.FD.FIFO.hMem
				lda (pFD),y
				jsr K.GetMemPtr
				>STYA .1+2
				
				ldy #S.FD.FIFO.Head
				lda (pFD),y
				inc
				dey						#S.FD.FIFO.Tail	
				cmp (pFD),y
				beq .9					FIFO is full
				iny
				sta (pFD),y
				tay
				lda K.IOBuf
.1				sta $ffff,y
				clc
				rts
				
.9				lda #MLI.E.VOLFULL
				.HS 2C					bit abs			
.99				lda #MLI.E.EOF
				sec
				rts	
*/--------------------------------------
* # IOCTL
* ## C
* `int ioctl(int fd, unsigned long request, void * param );`
* ## ASM
* **In:** 
* `PUSHWI param`
* `lda #request`
* `ldy fd`
* `>SYSCALL IOCTL`
* **Out:**
*  Y,A = ...
*\--------------------------------------
K.IOCTL			tax						op
				>PULLB .1+1				param LO
				>PULLB .2+1				param HI
				
				tya						id
				
				jsr K.GetDevByID
				bcs K.IOCTL.9
				
				>STYA pFD
				
.1				ldy #$ff				SELF MODIFIED
.2				lda #$ff				SELF MODIFIED

				jmp (pFD)				x = op
				
K.IOCTL.9		rts
*/--------------------------------------
* # pipe
* ## C
* `int pipe(int pipefd[2]);`
* ## ASM
* **In:** 
*\-------------------------------------- 
IO.SELECT		cmp DevMgr.DevCnt
				bcs .9

				tax
				
				ldy FD.Table.PTRLO,x
				lda FD.Table.PTRHI,x
				>STYA pFD
				rts
				
.9				lda #MLI.E.NODEV
				rts				
*--------------------------------------
IO.PullMLIPath	>PULLYA
IO.SetMLIPathYA	>STYA .1+1
				
				ldx #0
				
.1				lda $ffff,x				Self Modified
				beq .8
				inx
				sta K.MLI.PATH,x
				cpx #MLI.MAXPATH
				bne .1
				
.8				stx K.MLI.PATH
				inx
				stz K.MLI.PATH,x
				
				rts
*--------------------------------------
IO.DEVDIR		>PSTR "/DEV/"
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.IO
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM