QVSIZE
virtual_avail += QVSIZE;
ioaccess((vaddr_t)qv_addr, QVADDR, (QVSIZE/VAX_NBPG));
if (bus_space_map(sc->sc_fbt, sc->sc_fbphys, QVSIZE,
sc->sc_fbphys & 0x3fffff, QVSIZE, EX_WAITOK)) {
bzero(sc->sc_fb, QVSIZE);
if (offset >= QVSIZE || offset < 0)