Function nanoseconds

freebsd/kern/subr_lock.c:283–294

#ifndef USE_CPU_NANOSECONDS
uint64_t
nanoseconds(void)
{
	struct bintime bt;
	uint64_t ns;

	binuptime(&bt);
	/* From bintime2timespec */
	ns = bt.sec * (uint64_t)1000000000;
	ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
	return (ns);
}
#endif

static void