[edk2-devel] [Patch 1/1] PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe: PcdRtcDefaultYear bounds
Michael D Kinney
michael.d.kinney at intel.com
Wed Mar 29 22:36:56 UTC 2023
Add bounds checks of PcdRtcDefaultYear to guarantee that the year
is always between PcdMinimalValidYear and PcdMaximalValidYear.
This is required to make the following commit a backwards compatible
change and guarantee and invalid year is never set.
https://github.com/tianocore/edk2/commit/d55d73152ebf5c793b645d6ec5bc517d219881cd
This is required because use of an expression in the DEC file
PCD default value is only used to determine the DEC default values.
If an INF/DSC overrides PcdRtcDefaultYear, then the DEC expression
for PcdMinimalValidYear is not applied again.
Cc: Ray Ni <ray.ni at intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney at intel.com>
---
PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
index b059e92f02dc..15759463f2a3 100644
--- a/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
+++ b/PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
@@ -317,7 +317,8 @@ PcRtcInit (
Time.Hour = RTC_INIT_HOUR;
Time.Day = RTC_INIT_DAY;
Time.Month = RTC_INIT_MONTH;
- Time.Year = PcdGet16 (PcdRtcDefaultYear);
+ Time.Year = MAX (PcdGet16 (PcdRtcDefaultYear), PcdGet16 (PcdMinimalValidYear));
+ Time.Year = MIN (Time.Year, PcdGet16 (PcdMaximalValidYear));
Time.Nanosecond = 0;
Time.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
Time.Daylight = 0;
@@ -357,7 +358,8 @@ PcRtcInit (
Time.Hour = RTC_INIT_HOUR;
Time.Day = RTC_INIT_DAY;
Time.Month = RTC_INIT_MONTH;
- Time.Year = PcdGet16 (PcdRtcDefaultYear);
+ Time.Year = MAX (PcdGet16 (PcdRtcDefaultYear), PcdGet16 (PcdMinimalValidYear));
+ Time.Year = MIN (Time.Year, PcdGet16 (PcdMaximalValidYear));
Time.Nanosecond = 0;
Time.TimeZone = Global->SavedTimeZone;
Time.Daylight = Global->Daylight;
--
2.39.1.windows.1
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