MAKEBOOTDEV
MAKEBOOTDEV(dev_maj[dsk.type], dsk.slice, dsk.unit, dsk.part),
MAKEBOOTDEV(dev_maj[gdsk.dsk.type], gdsk.dsk.part + 1, gdsk.dsk.unit, 0xff),
bootdev = MAKEBOOTDEV(dev_maj[DEVT_DISK], devdesc->d_slice + 1,
bootdev = MAKEBOOTDEV(dev_maj[bdev->dd.d_dev->dv_type],
MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.unit, 0),
rootdev = MAKEBOOTDEV(major, slice, unit, partition);