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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();
- }
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