Ejemplo n.º 1
0
/*
 * Initialize the TOD clock and the CPU timer of
 * the boot cpu.
 */
void __init time_init(void)
{
	u64 init_timer_cc;

	init_timer_cc = reset_tod_clock();
	jiffies_timer_cc = init_timer_cc - jiffies_64 * CLK_TICKS_PER_JIFFY;

	/* set xtime */
	tod_to_timeval(init_timer_cc - TOD_UNIX_EPOCH, &xtime);
        set_normalized_timespec(&wall_to_monotonic,
                                -xtime.tv_sec, -xtime.tv_nsec);

	/* request the clock comparator external interrupt */
	if (register_early_external_interrupt(0x1004,
					      clock_comparator_interrupt,
					      &ext_int_info_cc) != 0)
                panic("Couldn't request external interrupt 0x1004");

	if (clocksource_register(&clocksource_tod) != 0)
		panic("Could not register TOD clock source");

	/* request the timing alert external interrupt */
	if (register_early_external_interrupt(0x1406,
					      timing_alert_interrupt,
					      &ext_int_etr_cc) != 0)
		panic("Couldn't request external interrupt 0x1406");

	/* Enable TOD clock interrupts on the boot cpu. */
	init_cpu_timer();

#ifdef CONFIG_VIRT_TIMER
	vtime_init();
#endif
}
Ejemplo n.º 2
0
/*
 * Initialize the TOD clock and the CPU timer of
 * the boot cpu.
 */
void __init time_init(void)
{
	sched_clock_base_cc = reset_tod_clock();

	/* set xtime */
	tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &xtime);
        set_normalized_timespec(&wall_to_monotonic,
                                -xtime.tv_sec, -xtime.tv_nsec);

	/* request the clock comparator external interrupt */
	if (register_early_external_interrupt(0x1004,
					      clock_comparator_interrupt,
					      &ext_int_info_cc) != 0)
                panic("Couldn't request external interrupt 0x1004");

	if (clocksource_register(&clocksource_tod) != 0)
		panic("Could not register TOD clock source");

	/* request the timing alert external interrupt */
	if (register_early_external_interrupt(0x1406,
					      timing_alert_interrupt,
					      &ext_int_etr_cc) != 0)
		panic("Couldn't request external interrupt 0x1406");

	/* Enable TOD clock interrupts on the boot cpu. */
	init_cpu_timer();
	/* Enable cpu timer interrupts on the boot cpu. */
	vtime_init();
}
Ejemplo n.º 3
0
/*
 * Initialize the TOD clock and the CPU timer of
 * the boot cpu.
 */
void __init time_init(void)
{
	struct timespec ts;
	unsigned long flags;
	cycle_t now;

	/* Reset time synchronization interfaces. */
	etr_reset();
	stp_reset();

	/* request the clock comparator external interrupt */
	if (register_early_external_interrupt(0x1004,
					      clock_comparator_interrupt,
					      &ext_int_info_cc) != 0)
                panic("Couldn't request external interrupt 0x1004");

	/* request the timing alert external interrupt */
	if (register_early_external_interrupt(0x1406,
					      timing_alert_interrupt,
					      &ext_int_etr_cc) != 0)
		panic("Couldn't request external interrupt 0x1406");

	if (clocksource_register(&clocksource_tod) != 0)
		panic("Could not register TOD clock source");

	/*
	 * The TOD clock is an accurate clock. The xtime should be
	 * initialized in a way that the difference between TOD and
	 * xtime is reasonably small. Too bad that timekeeping_init
	 * sets xtime.tv_nsec to zero. In addition the clock source
	 * change from the jiffies clock source to the TOD clock
	 * source add another error of up to 1/HZ second. The same
	 * function sets wall_to_monotonic to a value that is too
	 * small for /proc/uptime to be accurate.
	 * Reset xtime and wall_to_monotonic to sane values.
	 */
	write_seqlock_irqsave(&xtime_lock, flags);
	now = get_clock();
	tod_to_timeval(now - TOD_UNIX_EPOCH, &xtime);
	clocksource_tod.cycle_last = now;
	clocksource_tod.raw_time = xtime;
	tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, &ts);
	set_normalized_timespec(&wall_to_monotonic, -ts.tv_sec, -ts.tv_nsec);
	write_sequnlock_irqrestore(&xtime_lock, flags);

	/* Enable TOD clock interrupts on the boot cpu. */
	init_cpu_timer();

	/* Enable cpu timer interrupts on the boot cpu. */
	vtime_init();
}