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-rw-r--r--arch/um/os-Linux/time.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
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+++ b/arch/um/os-Linux/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 <unistd.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 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 until interrupted
+ */
+void os_idle_sleep(void)
+{
+ struct itimerspec its;
+ sigset_t set, old;
+
+ /* block SIGALRM while we analyze the timer state */
+ sigemptyset(&set);
+ sigaddset(&set, SIGALRM);
+ sigprocmask(SIG_BLOCK, &set, &old);
+
+ /* check the timer, and if it'll fire then wait for it */
+ timer_gettime(event_high_res_timer, &its);
+ if (its.it_value.tv_sec || its.it_value.tv_nsec)
+ sigsuspend(&old);
+ /* either way, restore the signal mask */
+ sigprocmask(SIG_UNBLOCK, &set, NULL);
+}