A2osX/SYS/KERNEL.S.DEV.txt

NEW
PREFIX
AUTO 4,1
*/--------------------------------------
* # 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
				
.3				ldy Dev.Table-1,x
.4				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
* `>PUSHWI S.DIB`
* `lda DevID`
* `>SYSCALL GetDevStatus`
* ## RETURN VALUE
*\--------------------------------------
K.GetDevStatus	tax
				>PULLW K.S.IOCTL+S.IOCTL.BUFPTR

				lda Dev.Table,x
				beq K.GetDev.NODEV
				ldy Dev.Table-1,x
				>STYA pFD

				lda #S.IOCTL.STATCODE.GETDIB
K.GetDevStatus.I				
				sta K.S.IOCTL+S.IOCTL.STATCODE

				jsr K.IOCTL.GetPDrv
				
				>LDYAI K.S.IOCTL
				
				ldx #IOCTL.STATUS
				jmp (pDrv)
*/--------------------------------------
* # MKDev
* Create a hDEV
* ## C
* `hDEV mkdev (S.FD * fd, const char *devname)`
* ## ASM
* `>PUSHW devname`
* `>LDYA fd`
* `>SYSCALL mkdev
* ## RETURN VALUE
*  A = hDEV
*\--------------------------------------
K.MKDev			jsr MEM.SPtr1PPtr2		ptr1=fd, ptr2=name

				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 K.GetDevStatus.I
				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				lda pFD
				sta IRQ.Vectors,x
				lda pFD+1
				sta IRQ.Vectors+1,x
				
.8				lda DevMgr.DevIdx
				inc DevMgr.DevIdx
				inc DevMgr.DevIdx
*				clc
				rts
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.DEV
LOAD USR/SRC/SYS/KERNEL.S
ASM