Function pmap_extract

freebsd/arm64/arm64/pmap.c:1264–1304

* Routine: pmap_extract * Function: * Extract the physical page address associated * with the given map/virtual_address pair. */

 *		with the given map/virtual_address pair.
 */
vm_paddr_t
pmap_extract(pmap_t pmap, vm_offset_t va)
{
	pt_entry_t *pte, tpte;
	vm_paddr_t pa;
	int lvl;

	pa = 0;
	PMAP_LOCK(pmap);
	/*
	 * Find the block or page map for this virtual address. pmap_pte
	 * will return either a valid block/page entry, or NULL.
	 */
	pte = pmap_pte(pmap, va, &lvl);
	if (pte != NULL) {
		tpte = pmap_load(pte);
		pa = tpte & ~ATTR_MASK;
		switch(lvl) {
		case 1:
			KASSERT((tpte & ATTR_DESCR_MASK) == L1_BLOCK,
			    ("pmap_extract: Invalid L1 pte found: %lx",
			    tpte & ATTR_DESCR_MASK));
			pa |= (va & L1_OFFSET);
			break;
		case 2:
			KASSERT((tpte & ATTR_DESCR_MASK) == L2_BLOCK,
			    ("pmap_extract: Invalid L2 pte found: %lx",
			    tpte & ATTR_DESCR_MASK));
			pa |= (va & L2_OFFSET);
			break;
		case 3:
			KASSERT((tpte & ATTR_DESCR_MASK) == L3_PAGE,
			    ("pmap_extract: Invalid L3 pte found: %lx",
			    tpte & ATTR_DESCR_MASK));
			pa |= (va & L3_OFFSET);
			break;
		}
	}
	PMAP_UNLOCK(pmap);
	return (pa);
}

/*
 *	Routine:	pmap_extract_and_hold