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efi_loader: daylight saving time

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Adjust the SetTime() and GetTime() runtime services to correctly convert
the daylight saving time information when communicating with the RTC.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-10-23 05:30:29 +02:00
parent 529441ca89
commit 0eae552d18
1 changed files with 16 additions and 3 deletions
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19
lib/efi_loader/efi_runtime.c
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@ -266,9 +266,13 @@ static efi_status_t EFIAPI efi_get_time_boottime(
time->hour = tm.tm_hour; time->hour = tm.tm_hour;
time->minute = tm.tm_min; time->minute = tm.tm_min;
time->second = tm.tm_sec; time->second = tm.tm_sec;
if (tm.tm_isdst) if (tm.tm_isdst > 0)
time->daylight = time->daylight =
EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT; EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT;
else if (!tm.tm_isdst)
time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
else
time->daylight = 0;
time->timezone = EFI_UNSPECIFIED_TIMEZONE; time->timezone = EFI_UNSPECIFIED_TIMEZONE;
if (capabilities) { if (capabilities) {
@ -347,8 +351,17 @@ static efi_status_t EFIAPI efi_set_time_boottime(struct efi_time *time)
tm.tm_hour = time->hour; tm.tm_hour = time->hour;
tm.tm_min = time->minute; tm.tm_min = time->minute;
tm.tm_sec = time->second; tm.tm_sec = time->second;
tm.tm_isdst = time->daylight == switch (time->daylight) {
(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT); case EFI_TIME_ADJUST_DAYLIGHT:
tm.tm_isdst = 0;
break;
case EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT:
tm.tm_isdst = 1;
break;
default:
tm.tm_isdst = -1;
break;
}
/* Calculate day of week */ /* Calculate day of week */
rtc_calc_weekday(&tm); rtc_calc_weekday(&tm);