1/* $NetBSD: ktime.h,v 1.3 2014/07/16 20:56:25 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_KTIME_H_
33#define _LINUX_KTIME_H_
34
35#include <sys/types.h>
36#include <sys/endian.h>
37#include <sys/time.h>
38
39#include <linux/time.h>
40
41union ktime {
42 int64_t kt_nsec;
43 struct {
44#if _BYTE_ORDER == _BIG_ENDIAN
45 int32_t ktsn_sec;
46 int32_t ktsn_nsec;
47#else
48 int32_t ktsn_nsec;
49 int32_t ktsn_sec;
50#endif
51 } kt_sec_nsec;
52};
53
54typedef union ktime ktime_t;
55
56static inline ktime_t
57ktime_add_ns(ktime_t kt, int64_t nsec)
58{
59 return (ktime_t) { .kt_nsec = (kt.kt_nsec + nsec) };
60}
61
62static inline int64_t
63ktime_to_ns(ktime_t kt)
64{
65 return kt.kt_nsec;
66}
67
68static inline ktime_t
69ns_to_ktime(int64_t nsec)
70{
71 ktime_t kt;
72
73 kt.kt_nsec = nsec;
74
75 return kt;
76}
77
78static inline ktime_t
79ktime_sub(ktime_t a, ktime_t b)
80{
81 return ns_to_ktime(ktime_to_ns(a) - ktime_to_ns(b));
82}
83
84static inline ktime_t
85ktime_sub_ns(ktime_t a, int64_t nsec)
86{
87 return ns_to_ktime(ktime_to_ns(a) - nsec);
88}
89
90static inline struct timespec
91ktime_to_timespec(ktime_t kt)
92{
93 return ns_to_timespec(ktime_to_ns(kt));
94}
95
96static inline struct timeval
97ktime_to_timeval(ktime_t kt)
98{
99 return ns_to_timeval(ktime_to_ns(kt));
100}
101
102static inline ktime_t
103ktime_get(void)
104{
105 struct timespec ts;
106 ktime_t kt;
107
108 /* XXX nanotime or nanouptime? */
109 nanouptime(&ts);
110
111 /* XXX Silently truncate? */
112 kt.kt_sec_nsec.ktsn_sec = ts.tv_sec & 0xffffffffUL;
113 kt.kt_sec_nsec.ktsn_nsec = ts.tv_nsec;
114
115 return kt;
116}
117
118static inline ktime_t
119ktime_get_monotonic_offset(void)
120{
121 return ns_to_ktime(0); /* XXX Obviously wrong! Revisit. */
122}
123
124static inline bool
125time_in_range(unsigned long x, unsigned long a, unsigned long b)
126{
127 return ((a <= x) && (x <= b));
128}
129
130#endif /* _LINUX_KTIME_H_ */
131