PG_LEVEL_SIZE
#define PG_SIZE_4K PG_LEVEL_SIZE(PG_LEVEL_4K)
#define PG_SIZE_2M PG_LEVEL_SIZE(PG_LEVEL_2M)
#define PG_SIZE_1G PG_LEVEL_SIZE(PG_LEVEL_1G)
const uint64_t pg_size = PG_LEVEL_SIZE(level);
uint64_t pg_size = PG_LEVEL_SIZE(level);
size_t page_size = PG_LEVEL_SIZE(level);