/** @file\r
Implement EFI RealTimeClock runtime services via RTC Lib.\r
- \r
- Currently this driver does not support runtime virtual calling.\r
-\r
\r
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
- \r
+ Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR>\r
+\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
\r
**/\r
\r
-#include <PiDxe.h> \r
+#include <PiDxe.h>\r
+#include <Library/DebugLib.h>\r
+#include <Library/RealTimeClockLib.h>\r
#include <Library/UefiLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
-#include <Library/RealTimeClockLib.h>\r
+#include <Library/UefiRuntimeLib.h>\r
#include <Protocol/RealTimeClock.h>\r
\r
EFI_HANDLE mHandle = NULL;\r
\r
+//\r
+// These values can be set by SetTime () and need to be returned by GetTime ()\r
+// but cannot usually be kept by the RTC hardware, so we store them in a UEFI\r
+// variable instead.\r
+//\r
+typedef struct {\r
+ INT16 TimeZone;\r
+ UINT8 Daylight;\r
+} NON_VOLATILE_TIME_SETTINGS;\r
+\r
+STATIC CONST CHAR16 mTimeSettingsVariableName[] = L"RtcTimeSettings";\r
+STATIC NON_VOLATILE_TIME_SETTINGS mTimeSettings;\r
+\r
+STATIC\r
+BOOLEAN\r
+IsValidTimeZone (\r
+ IN INT16 TimeZone\r
+ )\r
+{\r
+ return TimeZone == EFI_UNSPECIFIED_TIMEZONE ||\r
+ (TimeZone >= -1440 && TimeZone <= 1440);\r
+}\r
\r
+STATIC\r
+BOOLEAN\r
+IsValidDaylight (\r
+ IN INT8 Daylight\r
+ )\r
+{\r
+ return Daylight == 0 ||\r
+ Daylight == EFI_TIME_ADJUST_DAYLIGHT ||\r
+ Daylight == (EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT);\r
+}\r
+\r
+STATIC\r
+BOOLEAN\r
+EFIAPI\r
+IsLeapYear (\r
+ IN EFI_TIME *Time\r
+ )\r
+{\r
+ if (Time->Year % 4 == 0) {\r
+ if (Time->Year % 100 == 0) {\r
+ if (Time->Year % 400 == 0) {\r
+ return TRUE;\r
+ } else {\r
+ return FALSE;\r
+ }\r
+ } else {\r
+ return TRUE;\r
+ }\r
+ } else {\r
+ return FALSE;\r
+ }\r
+}\r
+\r
+STATIC CONST INTN mDayOfMonth[12] = {\r
+ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31\r
+};\r
+\r
+STATIC\r
+BOOLEAN\r
+EFIAPI\r
+IsDayValid (\r
+ IN EFI_TIME *Time\r
+ )\r
+{\r
+ ASSERT (Time->Day >= 1);\r
+ ASSERT (Time->Day <= mDayOfMonth[Time->Month - 1]);\r
+ ASSERT (Time->Month != 2 || IsLeapYear (Time) || Time->Day <= 28);\r
+\r
+ if (Time->Day < 1 ||\r
+ Time->Day > mDayOfMonth[Time->Month - 1] ||\r
+ (Time->Month == 2 && !IsLeapYear (Time) && Time->Day > 28)) {\r
+ return FALSE;\r
+ }\r
+ return TRUE;\r
+}\r
+\r
+STATIC\r
+BOOLEAN\r
+EFIAPI\r
+IsTimeValid(\r
+ IN EFI_TIME *Time\r
+ )\r
+{\r
+ // Check the input parameters are within the range specified by UEFI\r
+ if (Time->Year < 1900 ||\r
+ Time->Year > 9999 ||\r
+ Time->Month < 1 ||\r
+ Time->Month > 12 ||\r
+ !IsDayValid (Time) ||\r
+ Time->Hour > 23 ||\r
+ Time->Minute > 59 ||\r
+ Time->Second > 59 ||\r
+ !IsValidTimeZone (Time->TimeZone) ||\r
+ !IsValidDaylight (Time->Daylight)) {\r
+ return FALSE;\r
+ }\r
+ return TRUE;\r
+}\r
\r
/**\r
Returns the current time and date information, and the time-keeping capabilities\r
EFIAPI\r
GetTime (\r
OUT EFI_TIME *Time,\r
- OUT EFI_TIME_CAPABILITIES *Capabilities\r
+ OUT EFI_TIME_CAPABILITIES *Capabilities\r
)\r
{\r
+ if (Time == NULL) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ //\r
+ // Set these first so the RealTimeClockLib implementation\r
+ // can override them based on its own settings.\r
+ //\r
+ Time->TimeZone = mTimeSettings.TimeZone;\r
+ Time->Daylight = mTimeSettings.Daylight;\r
+\r
return LibGetTime (Time, Capabilities);\r
}\r
\r
IN EFI_TIME *Time\r
)\r
{\r
- return LibSetTime (Time);\r
+ EFI_STATUS Status;\r
+ BOOLEAN TimeSettingsChanged;\r
+\r
+ if (Time == NULL || !IsTimeValid (Time)) {\r
+ return EFI_INVALID_PARAMETER;\r
+ }\r
+\r
+ TimeSettingsChanged = FALSE;\r
+ if (mTimeSettings.TimeZone != Time->TimeZone ||\r
+ mTimeSettings.Daylight != Time->Daylight) {\r
+\r
+ mTimeSettings.TimeZone = Time->TimeZone;\r
+ mTimeSettings.Daylight = Time->Daylight;\r
+ TimeSettingsChanged = TRUE;\r
+ }\r
+\r
+ Status = LibSetTime (Time);\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ if (TimeSettingsChanged) {\r
+ Status = EfiSetVariable (\r
+ (CHAR16 *)mTimeSettingsVariableName,\r
+ &gEfiCallerIdGuid,\r
+ EFI_VARIABLE_NON_VOLATILE |\r
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |\r
+ EFI_VARIABLE_RUNTIME_ACCESS,\r
+ sizeof (mTimeSettings),\r
+ (VOID *)&mTimeSettings);\r
+ if (EFI_ERROR (Status)) {\r
+ return EFI_DEVICE_ERROR;\r
+ }\r
+ }\r
+ return EFI_SUCCESS;\r
}\r
\r
\r
)\r
{\r
EFI_STATUS Status;\r
-\r
- LibRtcInitialize (ImageHandle, SystemTable);\r
+ UINTN Size;\r
+\r
+ Status = LibRtcInitialize (ImageHandle, SystemTable);\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ Size = sizeof (mTimeSettings);\r
+ Status = EfiGetVariable ((CHAR16 *)mTimeSettingsVariableName,\r
+ &gEfiCallerIdGuid, NULL, &Size, (VOID *)&mTimeSettings);\r
+ if (EFI_ERROR (Status) ||\r
+ !IsValidTimeZone (mTimeSettings.TimeZone) ||\r
+ !IsValidDaylight (mTimeSettings.Daylight)) {\r
+ DEBUG ((DEBUG_WARN, "%a: using default timezone/daylight settings\n",\r
+ __FUNCTION__));\r
+\r
+ mTimeSettings.TimeZone = EFI_UNSPECIFIED_TIMEZONE;\r
+ mTimeSettings.Daylight = 0;\r
+ }\r
\r
SystemTable->RuntimeServices->GetTime = GetTime;\r
SystemTable->RuntimeServices->SetTime = SetTime;\r
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