1/*	$NetBSD: time.h,v 1.11 2021/12/19 12:30:23 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_TIME_H_
33#define _LINUX_TIME_H_
34
35#include <sys/time.h>
36
37#include <linux/math64.h>
38#include <linux/seqlock.h>
39
40#define	timespec64	timespec	/* take that, 2038 */
41
42#define NSEC_PER_USEC	1000L
43#define NSEC_PER_MSEC	1000000L
44#define	NSEC_PER_SEC	1000000000L
45#define USEC_PER_MSEC	1000L
46
47/*
48 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
49 * happen on 32-bit systems because it returns unsigned long.  Some
50 * callers in Linux (implicitly) convert the result to time_t, though.
51 * We'll pretend get_seconds returns time_t and make sure all our
52 * callers treat it as if it did.
53 */
54
55static inline time_t
56get_seconds(void)
57{
58	return time_second;
59}
60
61static inline void
62getrawmonotonic(struct timespec *ts)
63{
64	getnanouptime(ts);
65}
66
67static inline void
68do_gettimeofday(struct timeval *tv)
69{
70	microtime(tv);
71}
72
73static inline bool
74timespec_valid(const struct timespec *ts)
75{
76	if (ts->tv_sec < 0)
77		return false;
78	if (1000000000L <= ts->tv_nsec)
79		return false;
80	return true;
81}
82
83static inline struct timespec
84ns_to_timespec(const int64_t nsec)
85{
86	struct timespec ts;
87
88	ts.tv_sec = (nsec / 1000000000L);
89	ts.tv_nsec = (nsec % 1000000000L);
90	if (ts.tv_nsec < 0) {
91		ts.tv_sec -= 1;
92		ts.tv_nsec += 1000000000L;
93	}
94
95	return ts;
96}
97
98static inline int64_t
99timespec_to_ns(const struct timespec *ts)
100{
101	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
102}
103
104static inline struct timeval
105ns_to_timeval(int64_t nsec)
106{
107	struct timespec ts;
108	struct timeval tv;
109
110	ts = ns_to_timespec(nsec);
111	TIMESPEC_TO_TIMEVAL(&tv, &ts);
112
113	return tv;
114}
115
116static inline int64_t
117timeval_to_ns(const struct timeval *tv)
118{
119	return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
120}
121
122static inline struct timespec
123timespec_sub(struct timespec a, struct timespec b)
124{
125	struct timespec d;
126
127	timespecsub(&a, &b, &d);
128
129	return d;
130}
131
132static inline void
133set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
134{
135	while (nsec >= 1000000000L) {
136		nsec -= 1000000000L;
137		sec += 1;
138	}
139	while (nsec < 0) {
140		nsec += 1000000000L;
141		sec -= 1;
142	}
143	ts->tv_sec = sec;
144	ts->tv_nsec = nsec;
145}
146
147static inline bool
148time_after32(uint32_t a, uint32_t b)
149{
150	return (int32_t)(b - a) < 0;
151}
152
153#endif  /* _LINUX_TIME_H_ */
154