int
devread(Xfs *xf, int32_t addr, void *buf, int32_t n)
{
int32_t nread;
if(xf->dev < 0)
return -1;
nread = pread(xf->dev, buf, n, xf->offset+(int64_t)addr*Sectorsize);
if (nread == n)
return 0;
return deverror("read", xf, addr, n, nread);
}
int
devwrite(Xfs *xf, int32_t addr, void *buf, int32_t n)
{
int32_t nwrite;
if(xf->omode==OREAD)
return -1;
if(xf->dev < 0)
return -1;
nwrite = pwrite(xf->dev, buf, n, xf->offset+(int64_t)addr*Sectorsize);
if (nwrite == n)
return 0;
return deverror("write", xf, addr, n, nwrite);
}
/*
* This is the disk interrupt service routine.
*/
static void ideISR(int irq, InterruptContext *icp) {
unsigned int diskCtrl;
struct buf *bp;
/* set process priority, re-enable interrupts */
spl5();
enableInt();
/* clear done bit und thus the yet pending irq */
diskCtrl = *DISK_CTRL;
*DISK_CTRL = diskCtrl & (unsigned)~(DISK_CTRL_DONE | DISK_CTRL_STRT);
if (ideTab.b_active == 0) {
return;
}
bp = ideTab.b_actf;
ideTab.b_active = 0;
if (diskCtrl & DISK_CTRL_ERR) {
/* an error occurred */
deverror(bp->b_dev, bp->b_blkno, diskCtrl);
if (++ideTab.b_errcnt <= 10) {
ideStart();
return;
}
bp->b_flags |= B_ERROR;
} else {
if (bp->b_flags & B_READ) {
/* this was a read operation - transfer block from disk buffer */
copyWords((unsigned int *) bp->b_un.b_addr, DISK_BUFFER, WPB);
}
}
ideTab.b_errcnt = 0;
ideTab.b_actf = bp->av_forw;
bp->b_resid = 0;
/* hand buffer back to buffer cache */
iodone(bp);
/* start next operation */
ideStart();
}
