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for better structure. Much of this is related to <sys/clock.h>, which should really have been called <sys/calendar.h>, but unless and until we need the name, the repocopy can wait. In general the kernel does not know about minutes, hours, days, timezones, daylight savings time, leap-years and such. All that is theoretically a matter for userland only. Parts of kernel code does however care: badly designed filesystems store timestamps in local time and RTC chips almost universally track time in a YY-MM-DD HH:MM:SS format, and sometimes in local timezone instead of UTC. For this we have <sys/clock.h> <sys/time.h> on the other hand, deals with time_t, timeval, timespec and so on. These know only seconds and fractions thereof. Move inittodr() and resettodr() prototypes to <sys/time.h>. Retain the names as it is one of the few surviving PDP/VAX references. Move startrtclock() to <machine/clock.h> on relevant platforms, it is a MD call between machdep.c/clock.c. Remove references to it elsewhere. Remove a lot of unnecessary <sys/clock.h> includes. Move the machdep.disable_rtc_set sysctl to subr_rtc.c where it belongs. XXX: should be kern.disable_rtc_set really, it's not MD.
228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: clock.c 1.18 91/01/21$
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* from: @(#)clock.c 8.2 (Berkeley) 1/12/94
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* from: NetBSD: clock_subr.c,v 1.6 2001/07/07 17:04:02 thorpej Exp
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* and
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* from: src/sys/i386/isa/clock.c,v 1.176 2001/09/04
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/sysctl.h>
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#include <sys/timetc.h>
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#define ct_debug bootverbose
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static int adjkerntz; /* local offset from GMT in seconds */
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static int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
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int tz_minuteswest;
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int tz_dsttime;
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/*
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* This have traditionally been in machdep, but should probably be moved to
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* kern.
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*/
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SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock,
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CTLFLAG_RW, &wall_cmos_clock, 0, "");
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static int
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sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
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{
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int error;
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error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
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if (!error && req->newptr)
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resettodr();
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return (error);
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}
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SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
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&adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
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/*--------------------------------------------------------------------*
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* Generic routines to convert between a POSIX date
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* (seconds since 1/1/1970) and yr/mo/day/hr/min/sec
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* Derived from NetBSD arch/hp300/hp300/clock.c
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*/
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#define FEBRUARY 2
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#define days_in_year(y) (leapyear(y) ? 366 : 365)
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#define days_in_month(y, m) \
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(month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0))
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/* Day of week. Days are counted from 1/1/1970, which was a Thursday */
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#define day_of_week(days) (((days) + 4) % 7)
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static const int month_days[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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/*
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* This inline avoids some unnecessary modulo operations
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* as compared with the usual macro:
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* ( ((year % 4) == 0 &&
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* (year % 100) != 0) ||
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* ((year % 400) == 0) )
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* It is otherwise equivalent.
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*/
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static int
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leapyear(int year)
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{
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int rv = 0;
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if ((year & 3) == 0) {
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rv = 1;
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if ((year % 100) == 0) {
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rv = 0;
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if ((year % 400) == 0)
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rv = 1;
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}
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}
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return (rv);
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}
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static void
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print_ct(struct clocktime *ct)
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{
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printf("[%04d-%02d-%02d %02d:%02d:%02d]",
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ct->year, ct->mon, ct->day,
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ct->hour, ct->min, ct->sec);
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}
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int
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clock_ct_to_ts(struct clocktime *ct, struct timespec *ts)
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{
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time_t secs;
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int i, year, days;
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year = ct->year;
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if (ct_debug) {
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printf("ct_to_ts(");
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print_ct(ct);
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printf(")");
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}
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/* Sanity checks. */
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if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 ||
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ct->day > days_in_month(year, ct->mon) ||
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ct->hour > 23 || ct->min > 59 || ct->sec > 59 ||
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ct->year > 2037) { /* time_t overflow */
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if (ct_debug)
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printf(" = EINVAL\n");
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return (EINVAL);
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}
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/*
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* Compute days since start of time
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* First from years, then from months.
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*/
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days = 0;
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for (i = POSIX_BASE_YEAR; i < year; i++)
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days += days_in_year(i);
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/* Months */
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for (i = 1; i < ct->mon; i++)
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days += days_in_month(year, i);
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days += (ct->day - 1);
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/* XXX Dow sanity check. Dow is not used, so should we check it? */
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if (ct->dow != -1 && ct->dow != day_of_week(days))
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return (EINVAL);
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/* Add hours, minutes, seconds. */
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secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec;
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ts->tv_sec = secs;
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ts->tv_nsec = ct->nsec;
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if (ct_debug)
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printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec);
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return (0);
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}
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void
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clock_ts_to_ct(struct timespec *ts, struct clocktime *ct)
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{
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int i, year, days;
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time_t rsec; /* remainder seconds */
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time_t secs;
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secs = ts->tv_sec;
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days = secs / SECDAY;
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rsec = secs % SECDAY;
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ct->dow = day_of_week(days);
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/* Subtract out whole years, counting them in i. */
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for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++)
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days -= days_in_year(year);
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ct->year = year;
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/* Subtract out whole months, counting them in i. */
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for (i = 1; days >= days_in_month(year, i); i++)
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days -= days_in_month(year, i);
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ct->mon = i;
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/* Days are what is left over (+1) from all that. */
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ct->day = days + 1;
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/* Hours, minutes, seconds are easy */
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ct->hour = rsec / 3600;
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rsec = rsec % 3600;
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ct->min = rsec / 60;
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rsec = rsec % 60;
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ct->sec = rsec;
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ct->nsec = ts->tv_nsec;
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if (ct_debug) {
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printf("ts_to_ct(%ld.%09ld) = ",
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(long)ts->tv_sec, (long)ts->tv_nsec);
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print_ct(ct);
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printf("\n");
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}
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}
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int
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utc_offset(void)
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{
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return (tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0));
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}
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