1 /*
2 * Copyright (C) 2018-2022 Intel Corporation.
3 * SPDX-License-Identifier: BSD-3-Clause
4 */
5
6 #ifndef _TIMER_H_
7 #define _TIMER_H_
8
9 #include <time.h> // for struct itimerspec
10 #include <sys/param.h>
11
12 struct acrn_timer {
13 int32_t fd;
14 int32_t clockid;
15 struct mevent *mevp;
16 void (*callback)(void *, uint64_t);
17 void *callback_param;
18 };
19
20 int32_t
21 acrn_timer_init(struct acrn_timer *timer, void (*cb)(void *, uint64_t), void *param);
22 void
23 acrn_timer_deinit(struct acrn_timer *timer);
24 int32_t
25 acrn_timer_settime(struct acrn_timer *timer, const struct itimerspec *new_value);
26 int32_t
27 acrn_timer_settime_abs(struct acrn_timer *timer,
28 const struct itimerspec *new_value);
29 int32_t
30 acrn_timer_gettime(struct acrn_timer *timer, struct itimerspec *cur_value);
31
32 #define NS_PER_SEC (1000000000ULL)
33
34 static inline uint64_t
ts_to_ticks(const uint32_t freq,const struct timespec * const ts)35 ts_to_ticks(const uint32_t freq, const struct timespec *const ts)
36 {
37 uint64_t tv_sec_ticks, tv_nsec_ticks;
38
39 tv_sec_ticks = ts->tv_sec * freq;
40 tv_nsec_ticks = (ts->tv_nsec * freq) / NS_PER_SEC;
41
42 return tv_sec_ticks + tv_nsec_ticks;
43 }
44
45 static inline void
ticks_to_ts(const uint32_t freq,const uint64_t ticks,struct timespec * const ts)46 ticks_to_ts(const uint32_t freq, const uint64_t ticks,
47 struct timespec *const ts)
48 {
49 uint64_t ns;
50
51 ns = howmany(ticks * NS_PER_SEC, freq);
52
53 ts->tv_sec = ns / NS_PER_SEC;
54 ts->tv_nsec = ns % NS_PER_SEC;
55 }
56 #endif /* _VTIMER_ */
57