sector             79 ide.c            int sector = b->blockno * sector_per_block;
sector             86 ide.c            outb(0x1f3, sector & 0xff);
sector             87 ide.c            outb(0x1f4, (sector >> 8) & 0xff);
sector             88 ide.c            outb(0x1f5, (sector >> 16) & 0xff);
sector             89 ide.c            outb(0x1f6, 0xe0 | ((b->dev&1)<<4) | ((sector>>24)&0x0f));