1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
4 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
5 * Copyright (C) 2012-2014 Cisco Systems
6 * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
7 */
8
9 #include <stddef.h>
10 #include <errno.h>
11 #include <signal.h>
12 #include <time.h>
13 #include <sys/time.h>
14 #include <kern_util.h>
15 #include <os.h>
16 #include <string.h>
17
18 static timer_t event_high_res_timer = 0;
19
timeval_to_ns(const struct timeval * tv)20 static inline long long timeval_to_ns(const struct timeval *tv)
21 {
22 return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
23 tv->tv_usec * UM_NSEC_PER_USEC;
24 }
25
timespec_to_ns(const struct timespec * ts)26 static inline long long timespec_to_ns(const struct timespec *ts)
27 {
28 return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec;
29 }
30
os_persistent_clock_emulation(void)31 long long os_persistent_clock_emulation(void)
32 {
33 struct timespec realtime_tp;
34
35 clock_gettime(CLOCK_REALTIME, &realtime_tp);
36 return timespec_to_ns(&realtime_tp);
37 }
38
39 /**
40 * os_timer_create() - create an new posix (interval) timer
41 */
os_timer_create(void)42 int os_timer_create(void)
43 {
44 timer_t *t = &event_high_res_timer;
45
46 if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1)
47 return -1;
48
49 return 0;
50 }
51
os_timer_set_interval(unsigned long long nsecs)52 int os_timer_set_interval(unsigned long long nsecs)
53 {
54 struct itimerspec its;
55
56 its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC;
57 its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC;
58
59 its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC;
60 its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC;
61
62 if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1)
63 return -errno;
64
65 return 0;
66 }
67
os_timer_one_shot(unsigned long long nsecs)68 int os_timer_one_shot(unsigned long long nsecs)
69 {
70 struct itimerspec its = {
71 .it_value.tv_sec = nsecs / UM_NSEC_PER_SEC,
72 .it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC,
73
74 .it_interval.tv_sec = 0,
75 .it_interval.tv_nsec = 0, // we cheat here
76 };
77
78 timer_settime(event_high_res_timer, 0, &its, NULL);
79 return 0;
80 }
81
82 /**
83 * os_timer_disable() - disable the posix (interval) timer
84 */
os_timer_disable(void)85 void os_timer_disable(void)
86 {
87 struct itimerspec its;
88
89 memset(&its, 0, sizeof(struct itimerspec));
90 timer_settime(event_high_res_timer, 0, &its, NULL);
91 }
92
os_nsecs(void)93 long long os_nsecs(void)
94 {
95 struct timespec ts;
96
97 clock_gettime(CLOCK_MONOTONIC,&ts);
98 return timespec_to_ns(&ts);
99 }
100
101 /**
102 * os_idle_sleep() - sleep for a given time of nsecs
103 * @nsecs: nanoseconds to sleep
104 */
os_idle_sleep(unsigned long long nsecs)105 void os_idle_sleep(unsigned long long nsecs)
106 {
107 struct timespec ts = {
108 .tv_sec = nsecs / UM_NSEC_PER_SEC,
109 .tv_nsec = nsecs % UM_NSEC_PER_SEC
110 };
111
112 /*
113 * Relay the signal if clock_nanosleep is interrupted.
114 */
115 if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL))
116 deliver_alarm();
117 }
118
