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check CMOS time against base time, for sanity. if CMOS time invalid, 

warn user and user base time.  if base time < 1985, warn the user.
if base time 5 or more years different than clock time, warn user,
and if it's base time that's greater, use it.  (The latter case is
handy if one has a machine in which the CMOS battery is dead... I do.)
This commit is contained in:
cgd 1995-06-26 10:14:05 +00:00
parent 23e75a550d
commit 59e990a56b
1 changed files with 44 additions and 13 deletions
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57
sys/arch/i386/isa/clock.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: clock.c,v 1.31 1995/05/04 19:39:33 cgd Exp $ */
/* $NetBSD: clock.c,v 1.32 1995/06/26 10:14:05 cgd Exp $ */
/*-
* Copyright (c) 1993, 1994 Charles Hannum.
@ -107,6 +107,11 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
void spinwait __P((int));
#define SECMIN ((unsigned)60) /* seconds per minute */
#define SECHOUR ((unsigned)(60*SECMIN)) /* seconds per hour */
#define SECDAY ((unsigned)(24*SECHOUR)) /* seconds per day */
#define SECYR ((unsigned)(365*SECDAY)) /* seconds per common year */
__inline u_int
mc146818_read(sc, reg)
void *sc; /* XXX use it? */
@ -141,7 +146,7 @@ startrtclock()
outb(IO_TIMER1, TIMER_DIV(hz) % 256);
outb(IO_TIMER1, TIMER_DIV(hz) / 256);
/* Check diagnostic status */
/* Check diagnostic status */
if (s = mc146818_read(NULL, NVRAM_DIAG)) /* XXX softc */
printf("RTC BIOS diagnostic error %b\n", s, NVRAM_DIAG_BITS);
}
@ -310,7 +315,7 @@ rtcinit()
{
static int first_rtcopen_ever = 1;
if (!first_rtcopen_ever)
if (!first_rtcopen_ever)
return;
first_rtcopen_ever = 0;
@ -323,7 +328,7 @@ int
rtcget(regs)
mc_todregs *regs;
{
rtcinit();
if (mc146818_read(NULL, MC_REGD) & MC_REGD_VRT == 0) /* XXX softc */
return (-1);
@ -376,25 +381,34 @@ void
inittodr(base)
time_t base;
{
/*
* We ignore the suggested time for now and go for the RTC
* clock time stored in the CMOS RAM.
*/
mc_todregs rtclk;
time_t n;
int sec, min, hr, dom, mon, yr;
int i, days = 0;
int s;
/*
* We mostly ignore the suggested time and go for the RTC clock time
* stored in the CMOS RAM. If the time can't be obtained from the
* CMOS, or if the time obtained from the CMOS is 5 or more years
* less than the suggested time, we used the suggested time. (In
* the latter case, it's likely that the CMOS battery has died.)
*/
if (base < 15*SECYR) { /* if before 1985, something's odd... */
printf("WARNING: preposterous time in file system\n");
/* read the system clock anyway */
base = 17*SECYR + 186*SECDAY + SECDAY/2;
}
s = splclock();
if (rtcget(&rtclk)) {
splx(s);
return;
printf("WARNING: invalid time in clock chip\n");
goto fstime;
}
splx(s);
timeset = 1;
sec = hexdectodec(rtclk[MC_SEC]);
min = hexdectodec(rtclk[MC_MIN]);
hr = hexdectodec(rtclk[MC_HOUR]);
@ -418,8 +432,25 @@ inittodr(base)
n += tz.tz_minuteswest * 60;
if (tz.tz_dsttime)
n -= 3600;
if (base < n - 5*SECYR)
printf("WARNING: file system time much less than clock time\n");
else if (base > n + 5*SECYR) {
printf("WARNING: clock time much less than file system time\n");
printf("WARNING: using file system time\n");
goto fstime;
}
timeset = 1;
time.tv_sec = n;
time.tv_usec = 0;
time.tv_usec = 0;
return;
fstime:
timeset = 1;
time.tv_sec = base;
time.tv_usec = 0;
printf("WARNING: CHECK AND RESET THE DATE!\n");
}
/*
@ -442,7 +473,7 @@ resettodr()
s = splclock();
if (rtcget(&rtclk))
bzero(&rtclk, sizeof(rtclk));
bzero(&rtclk, sizeof(rtclk));
splx(s);
diff = tz.tz_minuteswest * 60;