time.c
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// SPDX-License-Identifier: GPL-2.0
/*
* 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)
*/
#include <stddef.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <kern_util.h>
#include <os.h>
#include <string.h>
static timer_t event_high_res_timer = 0;
static inline long long timeval_to_ns(const struct timeval *tv)
{
return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
tv->tv_usec * UM_NSEC_PER_USEC;
}
static inline long long timespec_to_ns(const struct timespec *ts)
{
return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec;
}
long long os_persistent_clock_emulation(void)
{
struct timespec realtime_tp;
clock_gettime(CLOCK_REALTIME, &realtime_tp);
return timespec_to_ns(&realtime_tp);
}
/**
* os_timer_create() - create an new posix (interval) timer
*/
int os_timer_create(void)
{
timer_t *t = &event_high_res_timer;
if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1)
return -1;
return 0;
}
int os_timer_set_interval(unsigned long long nsecs)
{
struct itimerspec its;
its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC;
its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC;
its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC;
its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC;
if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1)
return -errno;
return 0;
}
int os_timer_one_shot(unsigned long long nsecs)
{
struct itimerspec its = {
.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC,
.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC,
.it_interval.tv_sec = 0,
.it_interval.tv_nsec = 0, // we cheat here
};
timer_settime(event_high_res_timer, 0, &its, NULL);
return 0;
}
/**
* os_timer_disable() - disable the posix (interval) timer
*/
void os_timer_disable(void)
{
struct itimerspec its;
memset(&its, 0, sizeof(struct itimerspec));
timer_settime(event_high_res_timer, 0, &its, NULL);
}
long long os_nsecs(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC,&ts);
return timespec_to_ns(&ts);
}
/**
* os_idle_sleep() - sleep for a given time of nsecs
* @nsecs: nanoseconds to sleep
*/
void os_idle_sleep(unsigned long long nsecs)
{
struct timespec ts = {
.tv_sec = nsecs / UM_NSEC_PER_SEC,
.tv_nsec = nsecs % UM_NSEC_PER_SEC
};
/*
* Relay the signal if clock_nanosleep is interrupted.
*/
if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL))
deliver_alarm();
}