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Commit 791a644a authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds
Browse files

uml: clocksource support 



Add clocksource support.

Signed-off-by: default avatarJeff Dike <jdike@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 31ccc1f5

arch/um/kernel/time.c

+20 −0
Original line number Diff line number Diff line
@@ -97,6 +97,21 @@ static irqreturn_t um_timer(int irq, void *dev) 
	return IRQ_HANDLED;

}



static cycle_t itimer_read(void)

{

	return os_nsecs();

}



static struct clocksource itimer_clocksource = {

	.name		= "itimer",

	.rating		= 300,

	.read		= itimer_read,

	.mask		= CLOCKSOURCE_MASK(64),

	.mult		= 1,

	.shift		= 0,

	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,

};



static void __init setup_itimer(void)

{

	int err;
@@ -111,6 +126,11 @@ static void __init setup_itimer(void) 
		clockevent_delta2ns(60 * HZ, &itimer_clockevent);

	itimer_clockevent.min_delta_ns =

		clockevent_delta2ns(1, &itimer_clockevent);

	err = clocksource_register(&itimer_clocksource);

	if (err) {

		printk(KERN_ERR "clocksource_register returned %d\n", err);

		return;

	}

	clockevents_register_device(&itimer_clockevent);

}