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 <unistd.h> |
11 | #include <errno.h> |
12 | #include <signal.h> |
13 | #include <time.h> |
14 | #include <sys/time.h> |
15 | #include <kern_util.h> |
16 | #include <os.h> |
17 | #include <string.h> |
18 | |
19 | static timer_t event_high_res_timer = 0; |
20 | |
21 | static inline long long timespec_to_ns(const struct timespec *ts) |
22 | { |
23 | return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec; |
24 | } |
25 | |
26 | long long os_persistent_clock_emulation(void) |
27 | { |
28 | struct timespec realtime_tp; |
29 | |
30 | clock_gettime(CLOCK_REALTIME, &realtime_tp); |
31 | return timespec_to_ns(ts: &realtime_tp); |
32 | } |
33 | |
34 | /** |
35 | * os_timer_create() - create an new posix (interval) timer |
36 | */ |
37 | int os_timer_create(void) |
38 | { |
39 | timer_t *t = &event_high_res_timer; |
40 | |
41 | if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1) |
42 | return -1; |
43 | |
44 | return 0; |
45 | } |
46 | |
47 | int os_timer_set_interval(unsigned long long nsecs) |
48 | { |
49 | struct itimerspec its; |
50 | |
51 | its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC; |
52 | its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC; |
53 | |
54 | its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC; |
55 | its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC; |
56 | |
57 | if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1) |
58 | return -errno; |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | int os_timer_one_shot(unsigned long long nsecs) |
64 | { |
65 | struct itimerspec its = { |
66 | .it_value.tv_sec = nsecs / UM_NSEC_PER_SEC, |
67 | .it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC, |
68 | |
69 | .it_interval.tv_sec = 0, |
70 | .it_interval.tv_nsec = 0, // we cheat here |
71 | }; |
72 | |
73 | timer_settime(event_high_res_timer, 0, &its, NULL); |
74 | return 0; |
75 | } |
76 | |
77 | /** |
78 | * os_timer_disable() - disable the posix (interval) timer |
79 | */ |
80 | void os_timer_disable(void) |
81 | { |
82 | struct itimerspec its; |
83 | |
84 | memset(&its, 0, sizeof(struct itimerspec)); |
85 | timer_settime(event_high_res_timer, 0, &its, NULL); |
86 | } |
87 | |
88 | long long os_nsecs(void) |
89 | { |
90 | struct timespec ts; |
91 | |
92 | clock_gettime(CLOCK_MONOTONIC,&ts); |
93 | return timespec_to_ns(ts: &ts); |
94 | } |
95 | |
96 | /** |
97 | * os_idle_sleep() - sleep until interrupted |
98 | */ |
99 | void os_idle_sleep(void) |
100 | { |
101 | struct itimerspec its; |
102 | sigset_t set, old; |
103 | |
104 | /* block SIGALRM while we analyze the timer state */ |
105 | sigemptyset(&set); |
106 | sigaddset(&set, SIGALRM); |
107 | sigprocmask(SIG_BLOCK, &set, &old); |
108 | |
109 | /* check the timer, and if it'll fire then wait for it */ |
110 | timer_gettime(event_high_res_timer, &its); |
111 | if (its.it_value.tv_sec || its.it_value.tv_nsec) |
112 | sigsuspend(&old); |
113 | /* either way, restore the signal mask */ |
114 | sigprocmask(SIG_UNBLOCK, &set, NULL); |
115 | } |
116 | |