Function cputick2usec

freebsd/kern/kern_tc.c:2105–2115

 */

uint64_t
cputick2usec(uint64_t tick)
{

	if (tick > 18446744073709551LL)		/* floor(2^64 / 1000) */
		return (tick / (cpu_tickrate() / 1000000LL));
	else if (tick > 18446744073709LL)	/* floor(2^64 / 1000000) */
		return ((tick * 1000LL) / (cpu_tickrate() / 1000LL));
	else
		return ((tick * 1000000LL) / cpu_tickrate());
}

cpu_tick_f	*cpu_ticks = tc_cpu_ticks;