A2osX/SYS/KERNEL.S.DEV.txt
2020-02-19 07:53:24 +01:00

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NEW
AUTO 3,1
*/--------------------------------------
* # GetDevByName
* Y,A = Ptr to device name (C-String)
* ## RETURN VALUE
* CC = OK, CS = ERROR
* Y,A = FD
* X = hDev
*\--------------------------------------
K.GetDevByName >STYA ZPPtr1 requested dev name
ldx #1
.1 lda Dev.Table-1,x
clc
adc #S.FD.DEV
sta ZPPtr2
lda Dev.Table,x
beq K.GetDev.NODEV
adc /S.FD.DEV
sta ZPPtr2+1
ldy #$ff
.2 iny
lda (ZPPtr1),y
cmp (ZPPtr2),y
bne .7
ora (ZPPtr2),y Both char are 0 ?
bne .2 no....loop
ldy Dev.Table-1,x
lda Dev.Table,x
clc
rts
.7 inx
inx
cpx #K.DEV.MAX*2+1
bne .1
K.GetDev.NODEV lda #MLI.E.NODEV
sec
K.GetDev.9 rts
*/--------------------------------------
* # GetDevStatus
* ## C
* `int getdevstatus(short int DevID, S.DIB *dstat);`
* ## ASM
* `>PUSHB DevID`
* `>PUSHW S.DIB`
* `>SYSCALL GetDevStatus`
* ## RETURN VALUE
*\--------------------------------------
K.GetDevStatus >PULLW K.S.IOCTL+S.IOCTL.BUFPTR
>PULLA
tax
lda Dev.Table,x
beq K.GetDev.NODEV
ldy Dev.Table-1,x
>STYA pFD
lda #S.IOCTL.STATCODE.GETDIB
jmp SHARED.GetDevStatus
*/--------------------------------------
* # MKDev
* Create a hDEV
* ## C
* `hDEV mkdev (S.FD *fd, const char *devname)`
* ## ASM
* `>PUSHW fd`
* `>PUSHW devname`
* `>SYSCALL mkdev
* ## RETURN VALUE
* A = hDEV
*\--------------------------------------
K.MKDev >PULLW ZPPtr2 ptr2=name
>PULLW ZPPtr1 ptr1=fd
ldx DevMgr.DevIdx
cpx #K.DEV.MAX*2+1
beq .9
ldy #$ff
ldx #S.FD.DEV
.1 iny Get DEV name length
inx compute FD+NAME+\0 in X
lda (ZPPtr2),y
bne .1
txa
tay
lda #0
jsr MEM.GetKrnlBuf
bcs .99
>STYA pFD
>STYA .4+1
ldx DevMgr.DevIdx
sta Dev.Table,x
tya
sta Dev.Table-1,x
ldy #S.FD.DEV-1
.2 lda (ZPPtr1),y
sta (pFD),y
dey
bpl .2
ldy #$ff
ldx #S.FD.DEV-1
.3 iny
inx
lda (ZPPtr2),y
.4 sta $ffff,x
bne .3
>LDYAI K.IOBuf
>STYA K.S.IOCTL+S.IOCTL.BUFPTR
lda #S.IOCTL.STATCODE.STATUS
jsr SHARED.GetDevStatus
bcs .99
lda K.IOBuf Get Status byte
bit #S.DIB.S.IRQ
beq .8
ldx #0
.5 lda IRQ.Vectors+1,x
beq .7
inx
inx
cpx #K.IRQDEV.MAX*2+1
bne .5
.9 lda #E.OOH
* sec
.99 rts
.7 ldy #IOCTL.IRQ+4
lda (pDRV),y
sta IRQ.Vectors,x
iny
lda (pDRV),y
sta IRQ.Vectors+1,x
.8 lda DevMgr.DevIdx
inc DevMgr.DevIdx
inc DevMgr.DevIdx
* clc
rts
*/--------------------------------------
* # IOCTL
* ## C
* `int ioctl(short int DevID, int request, void * param );`
* ## ASM
* `>PUSHB hDEV`
* `>PUSHB request`
* `>PUSHW param`
* `>SYSCALL IOCTL`
* ## RETURN VALUE
* Y,A = ...
*\--------------------------------------
K.IOCTL ldy #3 hDev
lda (pStack),y
tax
lda Dev.Table,x
beq .9
ldy Dev.Table-1,x
>STYA pFD
jsr SHARED.GetPDrv
ldy #2 request
lda (pStack),y
tax
>PULLYA param
inc pStack
inc pStack
jmp (pDrv)
.9 sec
lda #MLI.E.NODEV
>RET 4
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.DEV
LOAD USR/SRC/SYS/KERNEL.S
ASM