5656bdea79
consistant with other ports. Prevent uninitialized time from being written back to the RTC (1-Jan-1970) if the machine is halted from the root device name prompt (bootflags & RB_ASKNAME)
172 lines
5.2 KiB
C
172 lines
5.2 KiB
C
/* $NetBSD: clock.c,v 1.2 2000/08/29 10:34:13 wdk Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1992, 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, Ralph Campbell, and Kazumasa Utashiro of
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* Software Research Associates, Inc.
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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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*
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* @(#)clock.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/systm.h>
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#include <dev/clock_subr.h>
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#include <machine/cpu.h>
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#include <machine/autoconf.h>
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#include <machine/mainboard.h>
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#include <machine/sysconf.h>
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void setstatclockrate __P((int));
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void cpu_initclocks __P((void));
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void inittodr __P((time_t));
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void resettodr __P((void));
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#define MINYEAR 1998 /* "today" */
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/*
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* Machine-dependent clock routines.
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*
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* Startrtclock restarts the real-time clock, which provides
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* hardclock interrupts to kern_clock.c.
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*
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* Inittodr initializes the time of day hardware which provides
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* date functions. Its primary function is to use some file
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* system information in case the hardare clock lost state.
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*
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* Resettodr restores the time of day hardware after a time change.
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*/
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/*
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* We assume newhz is either stathz or profhz, and that neither will
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* change after being set up above. Could recalculate intervals here
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* but that would be a drag.
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*/
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void
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setstatclockrate(newhz)
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int newhz;
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{
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}
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/*
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* Set up the real-time and statistics clocks. Leave stathz 0 only if
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* no alternative timer is available.
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*/
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void
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cpu_initclocks()
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{
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}
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/*
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* Initialze the time of day register, based on the time base which is, e.g.
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* from a filesystem. Base provides the time to within six months,
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* and the time of year clock (if any) provides the rest.
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*/
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void
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inittodr(base)
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time_t base;
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{
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struct clock_ymdhms dt;
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int deltat, badbase = 0;
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if (base < (MINYEAR-1970)*SECYR) {
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printf("WARNING: preposterous time in file system\n");
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/* read the system clock anyway */
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base = 6*SECYR + 186*SECDAY + SECDAY/2;
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badbase = 1;
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}
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(*platform.read_todr)(&dt);
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/* simple sanity checks */
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if (dt.dt_mon < 1 || dt.dt_mon > 12 ||
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dt.dt_day < 1 || dt.dt_day > 31 ||
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dt.dt_hour > 23 || dt.dt_min > 59 || dt.dt_sec > 59) {
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printf("WARNING: preposterous clock chip time\n");
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/*
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* Believe the time in the file system for lack of
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* anything better, resetting the TODR.
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*/
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time.tv_sec = base;
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if (!badbase)
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resettodr();
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return;
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}
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/* now have days since Jan 1, 1970; the rest is easy... */
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time.tv_sec = clock_ymdhms_to_secs(&dt);
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if (!badbase) {
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/*
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* See if we gained/lost two or more days;
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* if so, assume something is amiss.
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*/
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deltat = time.tv_sec - base;
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if (deltat < 0)
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deltat = -deltat;
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if (deltat < 2 * SECDAY)
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return;
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printf("WARNING: clock %s %d days",
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time.tv_sec < base ? "lost" : "gained", deltat / SECDAY);
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printf(" -- CHECK AND RESET THE DATE!\n");
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}
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}
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/*
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* Reset the TODR based on the time value; used when the TODR
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* has a preposterous value and also when the time is reset
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* by the stime system call. Also called when the TODR goes past
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* TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight)
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* to wrap the TODR around.
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*/
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void
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resettodr()
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{
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struct clock_ymdhms dt;
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if (time.tv_sec >= (MINYEAR-1970)*SECYR) {
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clock_secs_to_ymdhms(time.tv_sec, &dt);
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(*platform.write_todr)(&dt);
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}
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}
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