Date: Tue, 04 Jan 2000 13:21:33 +0800 From: Peter Wemm <peter@netplex.com.au> To: Matt Jacob <mjacob@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/dec mcclock.c Message-ID: <20000104052133.C85E01CA0@overcee.netplex.com.au> In-Reply-To: Message from Matt Jacob <mjacob@FreeBSD.org> of "Mon, 03 Jan 2000 19:22:06 PST." <200001040322.TAA74392@freefall.freebsd.org>
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Matt Jacob wrote:
> mjacob 2000/01/03 19:22:06 PST
>
> Modified files:
> sys/dev/dec mcclock.c
> Log:
> Ho, ho, ho... this clock chip is not y2k compliant. Motorola
> has it blacklisted. Silly us for not planning ahead. Tsk. Anyway-
> a 10 year window patch is probably sufficient to still detect
> nonsense in the clock but allow us to roll past the year 2000.
Umm, this is the same chip that the PC rtc is based on:
#define MC_YEAR 0x9 /* Time of year: year in century (0-99) */
On the PC side of things we use an 70 year window. < 70 = 2000-2069
and >= 70 = 1970-1999.
#ifdef USE_RTC_CENTURY
year = readrtc(RTC_YEAR) + readrtc(RTC_CENTURY) * 100;
#else
year = readrtc(RTC_YEAR) + 1900;
if (year < 1970)
year += 100;
#endif
if (year < 1970) {
splx(s);
goto wrong_time;
}
The alpha equivalent of this code is in alpha/alpha/clock.c (inittodr), which
doesn't look quite right...
Cheers,
-Peter
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