e820_add_entry
if (e820_add_entry(address, address + length, type) != 0) {
if (e820_add_entry(base, base + length, type) != 0) {
if (e820_add_entry(address, address + length, type) != 0) {
error = e820_add_entry(0, lowmem_size, E820_TYPE_MEMORY);
error = e820_add_entry(4 * GB, 4 * GB + highmem_size,