X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=EmbeddedPkg%2FRealTimeClockRuntimeDxe%2FRealTimeClock.c;h=8323a4b4b84876aec4e42f68685a445a04719a99;hp=b93626a6fbece31118d1fb3bb73afcc83a9794d4;hb=76c09700edc67686b29662e81a3ca7d947594ce5;hpb=2ef2b01e07c02db339f34004445734a2dbdd80e1

diff --git a/EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClock.c b/EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClock.c
index b93626a6fb..8323a4b4b8 100644
--- a/EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClock.c
+++ b/EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClock.c
@@ -1,12 +1,10 @@
 /** @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>
 
-  Copyright (c) 2008-2009, Apple Inc. All rights reserved.
-  
-  All rights reserved. This program and the accompanying materials
+  This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php
@@ -16,15 +14,117 @@
 
 **/
 
-#include <PiDxe.h> 
+#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 <= 28);
+
+  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
@@ -43,9 +143,20 @@ EFI_STATUS
 EFIAPI
 GetTime (
   OUT EFI_TIME                *Time,
-  OUT  EFI_TIME_CAPABILITIES  *Capabilities
+  OUT EFI_TIME_CAPABILITIES   *Capabilities
   )
 {
+  if (Time == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // 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 +178,41 @@ SetTime (
   IN EFI_TIME                *Time
   )
 {
-  return LibSetTime (Time);
+  EFI_STATUS        Status;
+  BOOLEAN           TimeSettingsChanged;
+
+  if (Time == NULL || !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;
 }
 
 
@@ -138,8 +283,25 @@ InitializeRealTimeClock (
   )
 {
   EFI_STATUS  Status;
-
-  LibRtcInitialize (ImageHandle, SystemTable);
+  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;