ADDR_POFF
pgoff = va & ADDR_POFF;
va &= ~ADDR_POFF;
va &= ~ADDR_POFF;
pvo->pvo_vaddr &= ~ADDR_POFF;
pvo = pmap_pvo_find_va(pm, va & ~ADDR_POFF, NULL);
| (va & ADDR_POFF);
size_t offset = va & ADDR_POFF;
#define PVO_VADDR(pvo) ((pvo)->pvo_vaddr & ~ADDR_POFF)
va &= ADDR_PIDX | ADDR_POFF;