Function pmap_pde

freebsd/arm64/arm64/pmap.c:517–545

* Returns the lowest valid pde for a given virtual address. * The next level may or may not point to a valid page or block. */

 * The next level may or may not point to a valid page or block.
 */
static __inline pd_entry_t *
pmap_pde(pmap_t pmap, vm_offset_t va, int *level)
{
	pd_entry_t *l0, *l1, *l2, desc;

	l0 = pmap_l0(pmap, va);
	desc = pmap_load(l0) & ATTR_DESCR_MASK;
	if (desc != L0_TABLE) {
		*level = -1;
		return (NULL);
	}

	l1 = pmap_l0_to_l1(l0, va);
	desc = pmap_load(l1) & ATTR_DESCR_MASK;
	if (desc != L1_TABLE) {
		*level = 0;
		return (l0);
	}

	l2 = pmap_l1_to_l2(l1, va);
	desc = pmap_load(l2) & ATTR_DESCR_MASK;
	if (desc != L2_TABLE) {
		*level = 1;
		return (l1);
	}

	*level = 2;
	return (l2);
}

/*
 * Returns the lowest valid pte block or table entry for a given virtual