A2osX/SYS/KERNEL.S.DEV.txt

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NEW
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AUTO 3,1
*/--------------------------------------
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* # GetDevByName
* Y,A = Ptr to device name (C-String)
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* ## RETURN VALUE
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* CC = OK, CS = ERROR
* Y,A = FD
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* X = hDev
*\--------------------------------------
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K.GetDevByName >STYA ZPPtr1 requested dev name
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ldx #1
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.1 lda Dev.Table,x
beq .4
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sta pFD+1
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pha
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lda Dev.Table-1,x
sta pFD
clc
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adc #S.FD.DEV
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tay
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pla
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adc /S.FD.DEV
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jsr .8
bcs .3
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jsr DEV.GetPDrv
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>LDYA pFD X = hDevNod
* clc
rts
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.3 inx no....loop
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inx
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cpx #K.DEV.MAX*2+1
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bne .1
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.4 ldx #2
.5 lda Nod.Table.hFD-2,x
beq .7
lda Nod.Table.hName-2,x
beq .7
jsr K.GetMemPtr
jsr .8
bcs .7
lda Nod.Table.hFD-2,x
jsr K.GetMemPtr Y,A = pPD, X = hDevNod
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>STYA pFD for IO.Open
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* clc
rts
.7 inx
inx
cpx #K.NOD.MAX*2+2
bne .5
.9 lda #MLI.E.NODEV
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sec
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rts
*--------------------------------------
.8 >STYA ZPPtr2
ldy #$ff
.80 iny
lda (ZPPtr1),y
cmp (ZPPtr2),y
bne .89
eor #0
bne .80
clc
rts
.89 sec
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K.GetDev.9 rts
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*/--------------------------------------
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* # GetDevStatus
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* ## C
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* `int getdevstatus(short int DevID, S.DIB *dstat);`
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* ## ASM
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* `>PUSHB DevID`
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* `>PUSHW S.DIB`
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* `>SYSCALL GetDevStatus`
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* ## RETURN VALUE
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*\--------------------------------------
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K.GetDevStatus >PULLW K.S.IOCTL+S.IOCTL.BUFPTR
>PULLA
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jsr DEV.GetPFD
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bcs K.GetDev.9
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lda #S.IOCTL.S.GETDIB
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*--------------------------------------
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DEV.GetDevStatus
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sta K.S.IOCTL+S.IOCTL.S
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ldy #S.FD.DEV.DEVID
lda (pFD),y
sta K.S.IOCTL+S.IOCTL.UNITNUM
>LDYAI K.S.IOCTL
ldx #IOCTL.STATUS
*--------------------------------------
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DEV.pDrvJmp jmp (pDrv)
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*/--------------------------------------
* # MKDev
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* Create a hDEV
* ## C
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* `hDEV mkdev (S.FD *fd, const char *devname)`
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* ## ASM
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* `>PUSHW fd`
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* `>PUSHW devname`
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* `>SYSCALL mkdev`
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* ## RETURN VALUE
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* A = hDEV
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*\--------------------------------------
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K.MKDev jsr SHARED.PullP2P1 ptr2=name,tr1=fd
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ldx #1
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.10 lda Dev.Table,x
beq .11
inx
inx
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cpx #K.DEV.MAX*2+1
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bne .10
bra .9
.11 stx IO.hDevNod
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ldy #$ff
ldx #S.FD.DEV
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.1 iny Get DEV name length
inx compute FD+NAME+\0 in X
lda (ZPPtr2),y
bne .1
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txa
tay
lda #0
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jsr MEM.GetKrnlBuf
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bcs .99
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>STYA pFD
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>STYA .4+1
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ldx IO.hDevNod
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sta Dev.Table,x
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tya
sta Dev.Table-1,x
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ldy #S.FD.DEV-1
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.2 lda (ZPPtr1),y
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sta (pFD),y
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dey
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bpl .2
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ldy #$ff
ldx #S.FD.DEV-1
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.3 iny
inx
lda (ZPPtr2),y
.4 sta $ffff,x
bne .3
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>LDYAI K.IOBuf
>STYA K.S.IOCTL+S.IOCTL.BUFPTR
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jsr DEV.GetPDrv
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lda #S.IOCTL.S.STATUS
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jsr DEV.GetDevStatus
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bcs .99
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lda K.IOBuf Get Status byte
bit #S.DIB.S.IRQ
beq .8
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ldx #0
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.5 lda IRQ.Vectors+1,x
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beq .7
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inx
inx
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cpx #K.IRQDEV.MAX*2+1
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bne .5
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.9 lda #E.OOH
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* sec
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.99 rts
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.7 ldy #IOCTL.IRQ+4
lda (pDRV),y
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sta IRQ.Vectors,x
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iny
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lda (pDRV),y
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sta IRQ.Vectors+1,x
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.8 lda IO.hDevNod
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* clc
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rts
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*/--------------------------------------
* # IOCTL
* ## C
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* `int ioctl(short int DevID, short int request, void *param);`
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* ## ASM
* `>PUSHB hDEV`
* `>PUSHB request`
* `>PUSHW param`
* `>SYSCALL IOCTL`
* ## RETURN VALUE
* Y,A = ...
*\--------------------------------------
K.IOCTL ldy #3 hDev
lda (pStack),y
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jsr DEV.GetPFD
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bcs .9
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ldy #2 request
lda (pStack),y
tax
>PULLYA param
inc pStack
inc pStack
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jmp (pDrv)
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.9 >RET 4
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*--------------------------------------
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DEV.GetPFD sta IO.hDevNod
tax
lsr
bcs .1
lda Nod.Table.hFD-2,x empty slot ?
beq DEV.GetPFD.9
sta IO.hFD
jsr K.GetMemPtr
>STYA pFD
* clc
rts
.1 stz IO.hFD
ldy Dev.Table-1,x
lda Dev.Table,x
beq DEV.GetPFD.9
>STYA pFD
DEV.GetPDrv ldy #S.FD.DEV.DRVPTR
lda (pFD),y
sta pDRV
iny
lda (pFD),y
sta pDRV+1
clc
rts
DEV.GetPFD.9 lda #E.INVH
sec
rts
*--------------------------------------
* X = 0 > REG
* X = 1 > DIR
* X = 2 > PIPE
*--------------------------------------
DEV.MkFD stx .8+1
ldy DEV.MkFD.Y,x
lda #0
ldx #S.MEM.F.INIT0+S.MEM.F.FD
jsr MEM.GetMem.YAX
bcs .9
>STYA pFD
stx IO.hFD
.8 ldx #$ff SELF MODIFIED
lda DEV.MkFD.T,x
sta (pFD) X = hFD, A = T
* clc
.9 rts
DEV.MkFD.Y .DA #S.FD.REG,#S.FD.DIR,#S.FD.PIPE
DEV.MkFD.T .DA #S.FD.T.REG,#S.FD.T.DIR,#S.FD.T.PIPE
*--------------------------------------
DEV.Destroy ldx IO.hDevNod
lda Nod.Table.hName-2,x
beq .1
stz Nod.Table.hName-2,x
jsr K.FreeMem
ldx IO.hDevNod
.1 lda Nod.Table.hFD-2,x
stz Nod.Table.hFD-2,x
jmp K.FreeMem
*--------------------------------------
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MAN
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SAVE usr/src/sys/kernel.s.dev
LOAD usr/src/sys/kernel.s
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ASM