[edk2-devel] [PATCH v2 3/4] EmbeddedPkg/TimeBaseLib: Add function to check Timezone and Daylight
Nhi Pham via groups.io
nhi=os.amperecomputing.com at groups.io
Wed Jan 6 16:09:02 UTC 2021
This adds two functions IsValidTimeZone() and IsValidDaylight() to check
the time zone and daylight value from EFI time. These functions are
retrieved from the RealTimeClockRuntimeDxe module as they reduce
duplicated code in RTC modules.
Cc: Leif Lindholm <leif at nuviainc.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Signed-off-by: Nhi Pham <nhi at os.amperecomputing.com>
---
EmbeddedPkg/Include/Library/TimeBaseLib.h | 36 ++++++++++++++
EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c | 49 +++++++++++++++++++-
2 files changed, 83 insertions(+), 2 deletions(-)
diff --git a/EmbeddedPkg/Include/Library/TimeBaseLib.h b/EmbeddedPkg/Include/Library/TimeBaseLib.h
index a9f3c6588b75..10700d1a649a 100644
--- a/EmbeddedPkg/Include/Library/TimeBaseLib.h
+++ b/EmbeddedPkg/Include/Library/TimeBaseLib.h
@@ -83,6 +83,42 @@ IsDayValid (
IN EFI_TIME *Time
);
+/**
+ Check if the time zone is valid.
+ Valid values are between -1440 and 1440 or 2047 (EFI_UNSPECIFIED_TIMEZONE).
+
+ @param TimeZone The time zone to be checked.
+
+ @retval TRUE Valid.
+ @retval FALSE Invalid.
+
+**/
+BOOLEAN
+EFIAPI
+IsValidTimeZone (
+ IN INT16 TimeZone
+ );
+
+/**
+ Check if the daylight is valid.
+ Valid values are:
+ 0 : Time is not affected.
+ 1 : Time is affected, and has not been adjusted for daylight savings.
+ 3 : Time is affected, and has been adjusted for daylight savings.
+ All other values are invalid.
+
+ @param Daylight The daylight to be checked.
+
+ @retval TRUE Valid.
+ @retval FALSE Invalid.
+
+**/
+BOOLEAN
+EFIAPI
+IsValidDaylight (
+ IN INT8 Daylight
+ );
+
/**
Check if the UEFI time is valid.
diff --git a/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c b/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
index 17466c1e6c67..210d0b2bf17d 100644
--- a/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
+++ b/EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
@@ -210,6 +210,51 @@ IsDayValid (
return TRUE;
}
+/**
+ Check if the time zone is valid.
+ Valid values are between -1440 and 1440 or 2047 (EFI_UNSPECIFIED_TIMEZONE).
+
+ @param TimeZone The time zone to be checked.
+
+ @retval TRUE Valid.
+ @retval FALSE Invalid.
+
+**/
+BOOLEAN
+EFIAPI
+IsValidTimeZone (
+ IN INT16 TimeZone
+ )
+{
+ return TimeZone == EFI_UNSPECIFIED_TIMEZONE ||
+ (TimeZone >= -1440 && TimeZone <= 1440);
+}
+
+/**
+ Check if the daylight is valid.
+ Valid values are:
+ 0 : Time is not affected.
+ 1 : Time is affected, and has not been adjusted for daylight savings.
+ 3 : Time is affected, and has been adjusted for daylight savings.
+ All other values are invalid.
+
+ @param Daylight The daylight to be checked.
+
+ @retval TRUE Valid.
+ @retval FALSE Invalid.
+
+**/
+BOOLEAN
+EFIAPI
+IsValidDaylight (
+ IN INT8 Daylight
+ )
+{
+ return Daylight == 0 ||
+ Daylight == EFI_TIME_ADJUST_DAYLIGHT ||
+ Daylight == (EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT);
+}
+
/**
Check if the UEFI time is valid.
@@ -235,8 +280,8 @@ IsTimeValid (
(Time->Minute > 59 ) ||
(Time->Second > 59 ) ||
(Time->Nanosecond > 999999999) ||
- (!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||
- (Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))) {
+ (!IsValidTimeZone(Time->TimeZone)) ||
+ (!IsValidDaylight(Time->Daylight))) {
return FALSE;
}
--
2.17.1
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