8d647da1ed
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.
174 lines
5.0 KiB
C
174 lines
5.0 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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/*
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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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#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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#include "clock_if.h"
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static device_t clock_dev = NULL;
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static long clock_res;
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/* XXX: should be kern. now, it's no longer machdep. */
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static int disable_rtc_set;
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SYSCTL_INT(_machdep, OID_AUTO, disable_rtc_set,
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CTLFLAG_RW, &disable_rtc_set, 0, "");
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void
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clock_register(device_t dev, long res) /* res has units of microseconds */
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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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/* XXX: We should poll all registered RTCs in case of failure */
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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 += utc_offset();
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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 -= utc_offset();
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/* XXX: We should really set all registered RTCs */
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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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