Function pmap_pte

freebsd/arm64/arm64/pmap.c:552–592

* Returns the lowest valid pte block or table entry for a given virtual * address. If there are no valid entries return NULL and set the level to * the first invalid level. */

 * the first invalid level.
 */
static __inline pt_entry_t *
pmap_pte(pmap_t pmap, vm_offset_t va, int *level)
{
	pd_entry_t *l1, *l2, desc;
	pt_entry_t *l3;

	l1 = pmap_l1(pmap, va);
	if (l1 == NULL) {
		*level = 0;
		return (NULL);
	}
	desc = pmap_load(l1) & ATTR_DESCR_MASK;
	if (desc == L1_BLOCK) {
		*level = 1;
		return (l1);
	}

	if (desc != L1_TABLE) {
		*level = 1;
		return (NULL);
	}

	l2 = pmap_l1_to_l2(l1, va);
	desc = pmap_load(l2) & ATTR_DESCR_MASK;
	if (desc == L2_BLOCK) {
		*level = 2;
		return (l2);
	}

	if (desc != L2_TABLE) {
		*level = 2;
		return (NULL);
	}

	*level = 3;
	l3 = pmap_l2_to_l3(l2, va);
	if ((pmap_load(l3) & ATTR_DESCR_MASK) != L3_PAGE)
		return (NULL);

	return (l3);
}

bool
pmap_ps_enabled(pmap_t pmap __unused)