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 * $FreeBSD$ 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 */ 55extern int tz_minuteswest; 56extern int tz_dsttime; 57 58int utc_offset(void); 59 60/* 61 * Structure to hold the values typically reported by time-of-day clocks. 62 * This can be passed to the generic conversion functions to be converted 63 * to a struct timespec. 64 */ 65struct clocktime { 66 int year; /* year (4 digit year) */ 67 int mon; /* month (1 - 12) */ 68 int day; /* day (1 - 31) */ 69 int hour; /* hour (0 - 23) */ 70 int min; /* minute (0 - 59) */ 71 int sec; /* second (0 - 59) */ 72 int dow; /* day of week (0 - 6; 0 = Sunday) */ 73 long nsec; /* nano seconds */ 74}; 75 76int clock_ct_to_ts(struct clocktime *, struct timespec *); 77void clock_ts_to_ct(struct timespec *, struct clocktime *); 78void clock_register(device_t, long); 79 80/* 81 * BCD to decimal and decimal to BCD. 82 */ 83#define FROMBCD(x) bcd2bin(x) 84#define TOBCD(x) bin2bcd(x) 85 86/* Some handy constants. */ 87#define SECDAY (24 * 60 * 60) 88#define SECYR (SECDAY * 365) 89 90/* Traditional POSIX base year */ 91#define POSIX_BASE_YEAR 1970 92 93void timespec2fattime(struct timespec *tsp, int utc, u_int16_t *ddp, u_int16_t *dtp, u_int8_t *dhp); 94void fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc, struct timespec *tsp); 95 96#endif /* _KERNEL */ 97 98#endif /* !_SYS_CLOCK_H_ */ 99