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91f1c2b3cc
prevent the compiler from optimizing assignments into byte-copy operations which might make access to the individual fields non-atomic. Use the individual fields throughout, and don't bother locking them with Giant: it is no longer needed. Inspired by: tjr
320 lines
8.5 KiB
C
320 lines
8.5 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $FreeBSD$
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*/
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/*
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* Helpers for time-of-day clocks. This is useful for architectures that need
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* support multiple models of such clocks, and generally serves to make the
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* code more machine-independent.
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* If the clock in question can also be used as a time counter, the driver
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* needs to initiate this.
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* This code is not yet used by all architectures.
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*/
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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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#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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/* XXX: for the CPU_* sysctl OID constants. */
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#include <machine/cpu.h>
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#include "clock_if.h"
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static __inline int leapyear(int year);
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static int sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS);
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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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static device_t clock_dev = NULL;
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static long clock_res;
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int adjkerntz; /* local offset from GMT in seconds */
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int disable_rtc_set; /* disable resettodr() if != 0 */
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int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */
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/*
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* These 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_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
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&adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
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SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
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CTLFLAG_RW, &disable_rtc_set, 0, "");
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SYSCTL_INT(_machdep, CPU_WALLCLOCK, 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,
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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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/*
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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 __inline 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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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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/* 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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return (EINVAL);
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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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/* Another sanity check. */
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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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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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}
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void
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clock_register(device_t dev, long res)
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{
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if (clock_dev != NULL) {
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if (clock_res > res) {
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if (bootverbose) {
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device_printf(dev, "not installed as "
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"time-of-day clock: clock %s has higher "
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"resolution\n", device_get_name(clock_dev));
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}
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return;
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} else {
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if (bootverbose) {
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device_printf(clock_dev, "removed as "
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"time-of-day clock: clock %s has higher "
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"resolution\n", device_get_name(dev));
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}
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}
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}
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clock_dev = dev;
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clock_res = res;
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if (bootverbose) {
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device_printf(dev, "registered as a time-of-day clock "
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"(resolution %ldus)\n", res);
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}
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}
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/*
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* inittodr and settodr derived from the i386 versions written
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* by Christoph Robitschko <chmr@edvz.tu-graz.ac.at>, reintroduced and
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* updated by Chris Stenton <chris@gnome.co.uk> 8/10/94
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*/
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/*
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* Initialize the time of day register, based on the time base which is, e.g.
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* from a filesystem.
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*/
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void
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inittodr(time_t base)
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{
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struct timespec diff, ref, ts;
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int error;
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if (base) {
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ref.tv_sec = base;
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ref.tv_nsec = 0;
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tc_setclock(&ref);
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}
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if (clock_dev == NULL) {
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printf("warning: no time-of-day clock registered, system time "
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"will not be set accurately\n");
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return;
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}
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error = CLOCK_GETTIME(clock_dev, &ts);
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if (error != 0 && error != EINVAL) {
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printf("warning: clock_gettime failed (%d), the system time "
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"will not be set accurately\n", error);
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return;
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}
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if (error == EINVAL || ts.tv_sec < 0) {
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printf("Invalid time in real time clock.\n");
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printf("Check and reset the date immediately!\n");
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}
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ts.tv_sec += tz_minuteswest * 60 +
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(wall_cmos_clock ? adjkerntz : 0);
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if (timespeccmp(&ref, &ts, >)) {
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diff = ref;
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timespecsub(&ref, &ts);
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} else {
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diff = ts;
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timespecsub(&diff, &ref);
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}
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if (ts.tv_sec >= 2) {
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/* badly off, adjust it */
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tc_setclock(&ts);
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}
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}
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/*
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* Write system time back to RTC
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*/
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void
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resettodr()
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{
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struct timespec ts;
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int error;
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if (disable_rtc_set || clock_dev == NULL)
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return;
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getnanotime(&ts);
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ts.tv_sec -= tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0);
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if ((error = CLOCK_SETTIME(clock_dev, &ts)) != 0) {
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printf("warning: clock_settime failed (%d), time-of-day clock "
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"not adjusted to system time\n", error);
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return;
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}
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}
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