@@ -1,10 +1,8 @@
/** @file
Implement EFI RealTimeClock runtime services via RTC Lib.
- Currently this driver does not support runtime virtual calling.
-
-
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+ Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -17,14 +15,116 @@
**/
#include <PiDxe.h>
+#include <Library/DebugLib.h>
+#include <Library/RealTimeClockLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
-#include <Library/RealTimeClockLib.h>
+#include <Library/UefiRuntimeLib.h>
#include <Protocol/RealTimeClock.h>
EFI_HANDLE mHandle = NULL;
+//
+// These values can be set by SetTime () and need to be returned by GetTime ()
+// but cannot usually be kept by the RTC hardware, so we store them in a UEFI
+// variable instead.
+//
+typedef struct {
+ INT16 TimeZone;
+ UINT8 Daylight;
+} NON_VOLATILE_TIME_SETTINGS;
+
+STATIC CONST CHAR16 mTimeSettingsVariableName[] = L"RtcTimeSettings";
+STATIC NON_VOLATILE_TIME_SETTINGS mTimeSettings;
+
+STATIC
+BOOLEAN
+IsValidTimeZone (
+ IN INT16 TimeZone
+ )
+{
+ return TimeZone == EFI_UNSPECIFIED_TIMEZONE ||
+ (TimeZone >= -1440 && TimeZone <= 1440);
+}
+
+STATIC
+BOOLEAN
+IsValidDaylight (
+ IN INT8 Daylight
+ )
+{
+ return Daylight == 0 ||
+ Daylight == EFI_TIME_ADJUST_DAYLIGHT ||
+ Daylight == (EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT);
+}
+
+STATIC
+BOOLEAN
+EFIAPI
+IsLeapYear (
+ IN EFI_TIME *Time
+ )
+{
+ if (Time->Year % 4 == 0) {
+ if (Time->Year % 100 == 0) {
+ if (Time->Year % 400 == 0) {
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+ } else {
+ return TRUE;
+ }
+ } else {
+ return FALSE;
+ }
+}
+STATIC CONST INTN mDayOfMonth[12] = {
+ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+STATIC
+BOOLEAN
+EFIAPI
+IsDayValid (
+ IN EFI_TIME *Time
+ )
+{
+ ASSERT (Time->Day >= 1);
+ ASSERT (Time->Day <= mDayOfMonth[Time->Month - 1]);
+ ASSERT (Time->Month != 2 || (IsLeapYear (Time) && Time->Day <= 29));
+
+ if (Time->Day < 1 ||
+ Time->Day > mDayOfMonth[Time->Month - 1] ||
+ (Time->Month == 2 && (!IsLeapYear (Time) && Time->Day > 28))) {
+ return FALSE;
+ }
+ return TRUE;
+}
+
+STATIC
+BOOLEAN
+EFIAPI
+IsTimeValid(
+ IN EFI_TIME *Time
+ )
+{
+ // Check the input parameters are within the range specified by UEFI
+ if (Time->Year < 1900 ||
+ Time->Year > 9999 ||
+ Time->Month < 1 ||
+ Time->Month > 12 ||
+ !IsDayValid (Time) ||
+ Time->Hour > 23 ||
+ Time->Minute > 59 ||
+ Time->Second > 59 ||
+ !IsValidTimeZone (Time->TimeZone) ||
+ !IsValidDaylight (Time->Daylight)) {
+ return FALSE;
+ }
+ return TRUE;
+}
/**
Returns the current time and date information, and the time-keeping capabilities
@@ -46,6 +146,13 @@ GetTime (
OUT EFI_TIME_CAPABILITIES *Capabilities
)
{
+ //
+ // Set these first so the RealTimeClockLib implementation
+ // can override them based on its own settings.
+ //
+ Time->TimeZone = mTimeSettings.TimeZone;
+ Time->Daylight = mTimeSettings.Daylight;
+
return LibGetTime (Time, Capabilities);
}
@@ -67,7 +174,41 @@ SetTime (
IN EFI_TIME *Time
)
{
- return LibSetTime (Time);
+ EFI_STATUS Status;
+ BOOLEAN TimeSettingsChanged;
+
+ if (!IsTimeValid (Time)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ TimeSettingsChanged = FALSE;
+ if (mTimeSettings.TimeZone != Time->TimeZone ||
+ mTimeSettings.Daylight != Time->Daylight) {
+
+ mTimeSettings.TimeZone = Time->TimeZone;
+ mTimeSettings.Daylight = Time->Daylight;
+ TimeSettingsChanged = TRUE;
+ }
+
+ Status = LibSetTime (Time);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ if (TimeSettingsChanged) {
+ Status = EfiSetVariable (
+ (CHAR16 *)mTimeSettingsVariableName,
+ &gEfiCallerIdGuid,
+ EFI_VARIABLE_NON_VOLATILE |
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_RUNTIME_ACCESS,
+ sizeof (mTimeSettings),
+ (VOID *)&mTimeSettings);
+ if (EFI_ERROR (Status)) {
+ return EFI_DEVICE_ERROR;
+ }
+ }
+ return EFI_SUCCESS;
}
@@ -138,12 +279,26 @@ InitializeRealTimeClock (
)
{
EFI_STATUS Status;
+ UINTN Size;
Status = LibRtcInitialize (ImageHandle, SystemTable);
if (EFI_ERROR (Status)) {
return Status;
}
+ Size = sizeof (mTimeSettings);
+ Status = EfiGetVariable ((CHAR16 *)mTimeSettingsVariableName,
+ &gEfiCallerIdGuid, NULL, &Size, (VOID *)&mTimeSettings);
+ if (EFI_ERROR (Status) ||
+ !IsValidTimeZone (mTimeSettings.TimeZone) ||
+ !IsValidDaylight (mTimeSettings.Daylight)) {
+ DEBUG ((DEBUG_WARN, "%a: using default timezone/daylight settings\n",
+ __FUNCTION__));
+
+ mTimeSettings.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
+ mTimeSettings.Daylight = 0;
+ }
+
SystemTable->RuntimeServices->GetTime = GetTime;
SystemTable->RuntimeServices->SetTime = SetTime;
SystemTable->RuntimeServices->GetWakeupTime = GetWakeupTime;
@@ -1,8 +1,8 @@
#/** @file
-# Reset Architectural Protocol Driver as defined in PI
+# Real Time Clock Architectural Protocol Driver as defined in PI
#
-# This Reset module simulates system reset by process exit on NT.
-# Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR>
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -31,10 +31,11 @@ [Packages]
EmbeddedPkg/EmbeddedPkg.dec
[LibraryClasses]
- UefiBootServicesTableLib
- UefiDriverEntryPoint
DebugLib
RealTimeClockLib
+ UefiBootServicesTableLib
+ UefiDriverEntryPoint
+ UefiRuntimeLib
[Protocols]
gEfiRealTimeClockArchProtocolGuid
RealTimeClockRuntimeDxe defers the hardware/platform specific handling of reading/setting the hardware clock to RealTimeClockLib, but for unknown reasons, it also defers common functionality such as input validation and recording the timezone and DST settings (which are informational only and not managed by hardware) This has led to a lot of duplication in implementations of RealTimeClockLib as well as TimeBaseLib, to the point where each library implementation has its own set of UEFI variables to record the timezone and DST settings. This makes little sense, and so let's update RealTimeClockRuntimeDxe now to allow future implementations to rely on the core driver to take care of these things. Note that reading the timezone and DST settings occurs before calling into the library, so we can phase out this behavior gradually from library implementations in EDK2, edk2-platforms or out of tree. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClock.c | 165 +++++++++++++++++++- EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf | 11 +- 2 files changed, 166 insertions(+), 10 deletions(-) -- 2.11.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel