Function rtc_start

freebsd/x86/isa/atrtc.c:211–218

};

static int
rtc_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
{

	atrtc_rate(max(fls(period + (period >> 1)) - 17, 1));
	atrtc_enable_intr();
	return (0);
}

static int
rtc_stop(struct eventtimer *et)