__htobe64
#define __bemtoh64(_x) __htobe64(*(__uint64_t *)(_x))
#define __htobem64(_x, _v) (*(__uint64_t *)(_x) = __htobe64(_v))
#define htobe64(x) __htobe64(x)
#define be64toh(x) __htobe64(x)
#define betoh64(x) __htobe64(x)