![Arnd Bergmann](/assets/img/avatar_default.png)
This read_persistent_clock() implementation is the only remaining caller of set_normalized_timespec(). Using read_persistent_clock64() and set_normalized_timespec64() instead lets us remove the deprecated interface in the future and helps make 32-bit arch/um get closer to working beyond 2038. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Richard Weinberger <richard@nod.at>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
|
|
* 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 um_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_clock64(struct timespec64 *ts)
|
|
{
|
|
long long nsecs = os_persistent_clock_emulation();
|
|
|
|
set_normalized_timespec64(ts, nsecs / NSEC_PER_SEC,
|
|
nsecs % NSEC_PER_SEC);
|
|
}
|
|
|
|
void __init time_init(void)
|
|
{
|
|
timer_set_signal_handler();
|
|
late_time_init = um_timer_setup;
|
|
}
|