rem: vm_translation_map_quick_query(addr va, addr *out_physical)
add: vm_translation_map_quick_query(addr_t va, addr_t *out_physical)
context: vm_translation_map_quick_query(addr va, addr *out_physical){	ptentry *pentry;	if (page_hole_pgdir[VADDR_TO_PDENT(va)].present == 0) {		// no pagetable here		return ERR_VM_PAGE_NOT_PRESENT;	}	pentry = page_hole + va / PAGE_SIZE;	if (pentry->present == 0) {		// page mapping not valid		return ERR_VM_PAGE_NOT_PRESENT;	}	*out_physical = pentry->addr << 12;	return 0;}