FreeBSD/Linux Kernel Cross Reference
sys/sys/clock.h
1 /*-
2 * Copyright (c) 1996 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Gordon W. Ross
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $NetBSD: clock_subr.h,v 1.7 2000/10/03 13:41:07 tsutsui Exp $
30 *
31 *
32 * This file is the central clearing-house for calendrical issues.
33 *
34 * In general the kernel does not know about minutes, hours, days, timezones,
35 * daylight savings time, leap-years and such. All that is theoretically a
36 * matter for userland only.
37 *
38 * Parts of kernel code does however care: badly designed filesystems store
39 * timestamps in local time and RTC chips sometimes track time in a local
40 * timezone instead of UTC and so on.
41 *
42 * All that code should go here for service.
43 *
44 * $FreeBSD: releng/11.1/sys/sys/clock.h 306403 2016-09-28 09:46:29Z kib $
45 */
46
47 #ifndef _SYS_CLOCK_H_
48 #define _SYS_CLOCK_H_
49
50 #ifdef _KERNEL /* No user serviceable parts */
51
52 /*
53 * Timezone info from settimeofday(2), usually not used
54 */
55 extern int tz_minuteswest;
56 extern int tz_dsttime;
57 extern struct mtx resettodr_lock;
58
59 int utc_offset(void);
60
61 /*
62 * Structure to hold the values typically reported by time-of-day clocks.
63 * This can be passed to the generic conversion functions to be converted
64 * to a struct timespec.
65 */
66 struct clocktime {
67 int year; /* year (4 digit year) */
68 int mon; /* month (1 - 12) */
69 int day; /* day (1 - 31) */
70 int hour; /* hour (0 - 23) */
71 int min; /* minute (0 - 59) */
72 int sec; /* second (0 - 59) */
73 int dow; /* day of week (0 - 6; 0 = Sunday) */
74 long nsec; /* nano seconds */
75 };
76
77 int clock_ct_to_ts(struct clocktime *, struct timespec *);
78 void clock_ts_to_ct(struct timespec *, struct clocktime *);
79 void clock_register(device_t, long);
80
81 /*
82 * BCD to decimal and decimal to BCD.
83 */
84 #define FROMBCD(x) bcd2bin(x)
85 #define TOBCD(x) bin2bcd(x)
86
87 /* Some handy constants. */
88 #define SECDAY (24 * 60 * 60)
89 #define SECYR (SECDAY * 365)
90
91 /* Traditional POSIX base year */
92 #define POSIX_BASE_YEAR 1970
93
94 void timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp);
95 void fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp);
96
97 #endif /* _KERNEL */
98
99 #endif /* !_SYS_CLOCK_H_ */
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