A2osX/SYS/KERNEL.S.PIPE.txt
2021-05-19 14:44:47 +02:00

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NEW
AUTO 3,1
*--------------------------------------
PIPE.SRCBUF .EQ ZPDRV
PIPE.DSTBUF .EQ ZPDRV+2
PIPE.CNT .EQ ZPDRV+4
PIPE.BASEH .EQ ZPDRV+6
PIPE.BUFH .EQ ZPDRV+7
PIPE.SIZEH .EQ ZPDRV+8
*--------------------------------------
PIPE.OPEN ldy #S.FD.PIPE.S
lda (pFD),y
inc
sta (pFD),y
lda IO.hDevNod
clc
rts
*--------------------------------------
PIPE.CLOSE ldy #S.FD.PIPE.S
lda (pFD),y
bmi .1 remote PS closed its end
lda #$80
sta (pFD),y
clc
rts
.1 ldy #S.FD.PIPE.hMem
lda (pFD),y
beq .2
>SYSCALL2 FreeStkObj
.2 jmp DEV.Destroy
*--------------------------------------
* (pStack)+2 buf
* (pStack)+0 count
*--------------------------------------
PIPE.WRITE ldy #S.FD.PIPE.S
lda (pFD),y
bpl .10
jmp PIPE.eEOF Remote PS closed the Pipe
.10 ldy #S.FD.PIPE.Free
lda (pFD),y
cmp (pStack)
ldy #S.FD.PIPE.Free+1
lda (pFD),y
ldy #1
sbc (pStack),y
bcc PIPE.eNODATA not enough room in PIPE
ldy #S.FD.PIPE.Head+1
jsr PIPE.GetBuf
>STYA PIPE.DSTBUF
>PULLA get cnt lo
sta PIPE.CNT
eor #$ff
tax
>PULLA get cnt hi
sta PIPE.CNT+1
eor #$ff
pha
>PULLW PIPE.SRCBUF
ldy #S.FD.PIPE.Head
lda (pFD),y
tay
sta SETWRITEAUX
.1 inx
bne .2
pla
inc
beq .8
pha
.2 lda (PIPE.SRCBUF)
sta (PIPE.DSTBUF),y
inc PIPE.SRCBUF
bne .4
inc PIPE.SRCBUF+1
.4 iny
bne .1
lda PIPE.BUFH
inc
cmp PIPE.SIZEH
beq .6
sta PIPE.BUFH
inc PIPE.DSTBUF+1
bra .1
.6 stz PIPE.BUFH
lda PIPE.BASEH Pipe Buffer Base
sta PIPE.DSTBUF+1
bra .1
.8 sta CLRWRITEAUX
tya
ldy #S.FD.PIPE.Head
sta (pFD),y
iny
lda PIPE.BUFH
sta (pFD),y
ldy #S.FD.PIPE.Free
jsr PIPE.SubCnt
iny #S.FD.PIPE.Used
jsr PIPE.AddCnt
jmp PIPE.EXIT
PIPE.eEOF lda #MLI.E.EOF
.HS 2C BIT ABS
PIPE.eNODATA lda #E.NODATA
sec
>RET 5
*--------------------------------------
PIPE.READ ldy #S.FD.PIPE.Used+1
lda (pFD),y Data ?
dey
ora (pFD),y
bne .10 yes...
ldy #S.FD.PIPE.S
lda (pFD),y
bmi PIPE.eEOF Remote PS closed the Pipe
bpl PIPE.eNODATA
.10 ldy #S.FD.PIPE.Tail+1
jsr PIPE.GetBuf
>STYA PIPE.SRCBUF
>PULLA get cnt lo
tax
ldy #S.FD.PIPE.Used
cmp (pFD),y
>PULLA get cnt hi
pha
iny #S.FD.PIPE.Used+1
sbc (pFD),y
pla
bcc .12 cnt < Used
dey
lda (pFD),y
tax
iny
lda (pFD),y X,A = Used
.12 stx PIPE.CNT
sta PIPE.CNT+1
eor #$ff
pha
txa
eor #$ff
tax
>PULLW PIPE.DSTBUF get dest buf
ldy #S.FD.PIPE.Tail
lda (pFD),y
tay
sta SETREADAUX
.1 inx
bne .2
pla
inc
beq .8
pha
.2 lda (PIPE.SRCBUF),y
sta (PIPE.DSTBUF)
inc PIPE.DSTBUF
bne .4
inc PIPE.DSTBUF+1
.4 iny
bne .1
lda PIPE.BUFH
inc
cmp PIPE.SIZEH
beq .6
sta PIPE.BUFH
inc PIPE.SRCBUF+1
bra .1
.6 stz PIPE.BUFH
lda PIPE.BASEH
sta PIPE.SRCBUF+1 Restore Pipe Buf base
bra .1
.8 sta CLRREADAUX
tya
ldy #S.FD.PIPE.Tail
sta (pFD),y
iny
lda PIPE.BUFH
sta (pFD),y
ldy #S.FD.PIPE.Free
jsr PIPE.AddCnt
iny #S.FD.PIPE.Used
jsr PIPE.SubCnt
PIPE.EXIT >LDYA PIPE.CNT Y,A = bytes written
inc pStack Discard hFILE
clc
rts
*--------------------------------------
PIPE.GetBuf lda (pFD),y
sta PIPE.BUFH
ldy #S.FD.PIPE.Size+1
lda (pFD),y
sta PIPE.SIZEH
ldy #S.FD.PIPE.hMem
lda (pFD),y
>SYSCALL2 GetStkObjPtr
sta PIPE.BASEH Pipe Buffer Base
* clc
adc PIPE.BUFH
rts
*--------------------------------------
PIPE.AddCnt clc
lda (pFD),y
adc PIPE.CNT
sta (pFD),y
iny
lda (pFD),y
adc PIPE.CNT+1
sta (pFD),y
rts
*--------------------------------------
PIPE.SubCnt sec
lda (pFD),y
sbc PIPE.CNT
sta (pFD),y
iny
lda (pFD),y
sbc PIPE.CNT+1
sta (pFD),y
rts
*--------------------------------------
PIPE.EOF clc
ldy #S.FD.PIPE.Used
lda (pFD),y
iny
ora (pFD),y
beq .8
lda #0
* clc
rts
.8 dec lda #$ff
* clc
rts
*--------------------------------------
MAN
SAVE usr/src/sys/kernel.s.pipe
LOAD usr/src/sys/kernel.s
ASM