vax_btoc
vax_btoc(vax_btoc(sc->uv_size) * sizeof(struct pte)));
npf = vax_btoc(bp->b_bcount + o) + 1;
cca = (void *)vax_map_physmem(mapaddr, vax_btoc(sizeof(struct cca)));
MAPVIRT(ptemapstart, vax_btoc(usrptsize * sizeof(struct pte)));
dstlen = vax_btoc(len)*PPTESZ;