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[PATCH] x86_64: Handle years beyond 2100 

ACPIv2 has an official but optional way to get a date >2100.  Use it.
But all the platforms I tested didn't seem to support it.  But anyways
the x86-64 kernel should be ready for the 22nd century now.  Actually i
shouldn't care about this because I will be dead by then @)

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-03-25 16:30:31 +01:00 committed by Linus Torvalds
parent eaeae0cc98
commit 6954bee829
1 changed files with 17 additions and 5 deletions
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22
arch/x86_64/kernel/time.c
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@ -517,6 +517,7 @@ static unsigned long get_cmos_time(void)
unsigned int timeout = 1000000, year, mon, day, hour, min, sec;
unsigned char uip = 0, this = 0;
unsigned long flags;
unsigned extyear = 0;
/*
* The Linux interpretation of the CMOS clock register contents: When the
@ -545,6 +546,11 @@ static unsigned long get_cmos_time(void)
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
#ifdef CONFIG_ACPI
if (acpi_fadt.revision >= FADT2_REVISION_ID && acpi_fadt.century)
extyear = CMOS_READ(acpi_fadt.century);
#endif
spin_unlock_irqrestore(&rtc_lock, flags);
/*
@ -559,11 +565,17 @@ static unsigned long get_cmos_time(void)
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
/*
* x86-64 systems only exists since 2002.
* This will work up to Dec 31, 2100
*/
year += 2000;
if (extyear) {
BCD_TO_BIN(extyear);
year += extyear;
printk(KERN_INFO "Extended CMOS year: %d\n", extyear);
} else {
/*
* x86-64 systems only exists since 2002.
* This will work up to Dec 31, 2100
*/
year += 2000;
}
return mktime(year, mon, day, hour, min, sec);
}