/* * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk}) * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) * Copyright (C) 2012-2014 Cisco Systems * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ #include <linux/clockchips.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/jiffies.h>#include <linux/mm.h>#include <linux/sched.h>#include <linux/spinlock.h>#include <linux/threads.h>#include <asm/irq.h>#include <asm/param.h>#include <kern_util.h>#include <os.h>#include <timer-internal.h> void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs){	unsigned long flags; 	local_irq_save(flags);	do_IRQ(TIMER_IRQ, regs);	local_irq_restore(flags);} static int itimer_shutdown(struct clock_event_device *evt){	os_timer_disable();	return 0;} static int itimer_set_periodic(struct clock_event_device *evt){	os_timer_set_interval(NULL, NULL);	return 0;} static int itimer_next_event(unsigned long delta,			     struct clock_event_device *evt){	return os_timer_one_shot(delta);} static int itimer_one_shot(struct clock_event_device *evt){	os_timer_one_shot(1);	return 0;} static struct clock_event_device timer_clockevent = {	.name			= "posix-timer",	.rating			= 250,	.cpumask		= cpu_all_mask,	.features		= CLOCK_EVT_FEAT_PERIODIC |				  CLOCK_EVT_FEAT_ONESHOT,	.set_state_shutdown	= itimer_shutdown,	.set_state_periodic	= itimer_set_periodic,	.set_state_oneshot	= itimer_one_shot,	.set_next_event		= itimer_next_event,	.shift			= 0,	.max_delta_ns		= 0xffffffff,	.max_delta_ticks	= 0xffffffff,	.min_delta_ns		= TIMER_MIN_DELTA,	.min_delta_ticks	= TIMER_MIN_DELTA, // microsecond resolution should be enough for anyone, same as 640K RAM	.irq			= 0,	.mult			= 1,}; static irqreturn_t um_timer(int irq, void *dev){	if (get_current()->mm != NULL)	{        /* userspace - relay signal, results in correct userspace timers */		os_alarm_process(get_current()->mm->context.id.u.pid);	} 	(*timer_clockevent.event_handler)(&timer_clockevent); 	return IRQ_HANDLED;} static u64 timer_read(struct clocksource *cs){	return os_nsecs() / TIMER_MULTIPLIER;} static struct clocksource timer_clocksource = {	.name		= "timer",	.rating		= 300,	.read		= timer_read,	.mask		= CLOCKSOURCE_MASK(64),	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,}; static void __init timer_setup(void){	int err; 	err = request_irq(TIMER_IRQ, um_timer, IRQF_TIMER, "hr timer", NULL);	if (err != 0)		printk(KERN_ERR "register_timer : request_irq failed - "		       "errno = %d\n", -err); 	err = os_timer_create(NULL);	if (err != 0) {		printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);		return;	} 	err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER);	if (err) {		printk(KERN_ERR "clocksource_register_hz returned %d\n", err);		return;	}	clockevents_register_device(&timer_clockevent);} void read_persistent_clock(struct timespec *ts){	long long nsecs = os_persistent_clock_emulation(); 	set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,				nsecs % NSEC_PER_SEC);} void __init time_init(void){	timer_set_signal_handler();	late_time_init = timer_setup;}