pmap_get_ptp
error = pmap_get_ptp(pmap, &pt, va, flags, &ptp);
static int pmap_get_ptp(struct pmap *, struct pmap_ptparray *, vaddr_t, int,
error = pmap_get_ptp(pmap, &pt, va, PMAP_CANFAIL, &ptp);
error = pmap_get_ptp(pmap, &pt, va, flags, &ptp);