A2osX/SYS/KERNEL.S.DEV.txt

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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-1,x
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clc
adc #S.FD.DEV
sta ZPPtr2
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lda Dev.Table,x
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beq K.GetDev.NODEV
adc /S.FD.DEV
sta ZPPtr2+1
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ldy #$ff
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.2 iny
lda (ZPPtr1),y
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cmp (ZPPtr2),y
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bne .7
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ora (ZPPtr2),y Both char are 0 ?
bne .2 no....loop
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.3 ldy Dev.Table-1,x
.4 lda Dev.Table,x
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clc
rts
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.7 inx
inx
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cpx #K.DEV.MAX*2+1
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bne .1
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K.GetDev.NODEV lda #MLI.E.NODEV
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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* `>PUSHWI S.DIB`
* `lda DevID`
* `>SYSCALL GetDevStatus`
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* ## RETURN VALUE
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*\--------------------------------------
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K.GetDevStatus tax
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>PULLW K.S.IOCTL+S.IOCTL.BUFPTR
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lda Dev.Table,x
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beq K.GetDev.NODEV
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ldy Dev.Table-1,x
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>STYA pFD
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lda #S.IOCTL.STATCODE.GETDIB
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K.GetDevStatus.I
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sta K.S.IOCTL+S.IOCTL.STATCODE
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ldy #S.FD.DEV.DEVID
lda (pFD),y
sta K.S.IOCTL+S.IOCTL.UNITNUM
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jsr K.IOCTL.GetPDrv
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>LDYAI K.S.IOCTL
ldx #IOCTL.STATUS
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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 devname`
* `>LDYA fd`
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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.SPtr1PPtr2 ptr1=fd, ptr2=name
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ldx DevMgr.DevIdx
cpx #K.DEV.MAX*2+1
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beq .9
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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
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bcs .99
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>STYA pFD
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>STYA .4+1
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ldx DevMgr.DevIdx
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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
ldy #$ff
ldx #S.FD.DEV-1
.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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lda #S.IOCTL.STATCODE.STATUS
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jsr K.GetDevStatus.I
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 #S.FD.DEV.DRVPTR
lda (pFD),y
sta ZPPtr1
iny
lda (pFD),y
sta ZPPtr1+1
ldy #IOCTL.IRQ+4
lda (ZPPtr1),y
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sta IRQ.Vectors,x
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iny
lda (ZPPtr1),y
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sta IRQ.Vectors+1,x
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.8 lda DevMgr.DevIdx
inc DevMgr.DevIdx
inc DevMgr.DevIdx
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* clc
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rts
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*--------------------------------------
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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