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libpayload: Add gettimeofday() and friends

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Add a gettimeofday() implementation - it works pretty well, but it
drifts a little bit so its not very suitable for keeping time.  It
works best to track changes in time over small periods of time.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3272 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Jordan Crouse
2008-04-25 23:11:02 +00:00
parent d772e1e7fe
commit e2271430c5
7 changed files with 200 additions and 4 deletions
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40
payloads/libpayload/drivers/nvram.c
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@@ -93,3 +93,43 @@ void nvram_write(u8 val, u8 addr)
outb(addr, rtc_port);
outb(val, rtc_port + 1);
}
/**
* Return 1 if the NVRAM is currently updating and a 0 otherwise
* @return A 1 if the NVRAM is updating and 0 otherwise
*/
int nvram_updating(void)
{
return (nvram_read(NVRAM_RTC_FREQ_SELECT) & NVRAM_RTC_UIP) ? 1 : 0;
}
/**
* Get the current time and date from the RTC
*
* @param time A pointer to a broken-down time structure
*/
void rtc_read_clock(struct tm *time)
{
memset(time, 0, sizeof(*time));
while(nvram_updating());
time->tm_mon = bcd2dec(nvram_read(NVRAM_RTC_MONTH)) - 1;
time->tm_sec = bcd2dec(nvram_read(NVRAM_RTC_SECONDS));
time->tm_min = bcd2dec(nvram_read(NVRAM_RTC_MINUTES));
time->tm_mday = bcd2dec(nvram_read(NVRAM_RTC_DAY));
time->tm_hour = bcd2dec(nvram_read(NVRAM_RTC_HOURS));
/* Instead of finding the century register,
we just make an assumption that if the year value is
less then 80, then it is 2000+
*/
time->tm_year = bcd2dec(nvram_read(NVRAM_RTC_YEAR));
if (time->tm_year < 80)
time->tm_year += 100;
}