MAPVIRT
MAPVIRT(ptemapstart, vax_btoc(usrptsize * sizeof(struct pte)));
MAPVIRT(iospace, IOSPSZ); /* Device iospace mapping area */
MAPVIRT(qvmem[0], 64 * 1024 * NQD / VAX_NBPG);
MAPVIRT(qd_ubaio, 16);