[mirror_edk2.git] / ArmPlatformPkg / Bds / Bds.c

/** @file\r
*\r
*  Copyright (c) 2011-2014, ARM Limited. All rights reserved.\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
*  http://opensource.org/licenses/bsd-license.php\r
*\r
*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
*\r
**/\r
\r
#include "BdsInternal.h"\r
\r
#include <Library/PcdLib.h>\r
#include <Library/PerformanceLib.h>\r
\r
#include <Protocol/Bds.h>\r
\r
#include <Guid/EventGroup.h>\r
\r
#define EFI_SET_TIMER_TO_SECOND   10000000\r
\r
STATIC\r
EFI_STATUS\r
GetConsoleDevicePathFromVariable (\r
  IN  CHAR16*             ConsoleVarName,\r
  IN  CHAR16*             DefaultConsolePaths,\r
  OUT EFI_DEVICE_PATH**   DevicePaths\r
  )\r
{\r
  EFI_STATUS                Status;\r
  UINTN                     Size;\r
  EFI_DEVICE_PATH_PROTOCOL* DevicePathInstances;\r
  EFI_DEVICE_PATH_PROTOCOL* DevicePathInstance;\r
  CHAR16*                   DevicePathStr;\r
  CHAR16*                   NextDevicePathStr;\r
  EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL  *EfiDevicePathFromTextProtocol;\r
\r
  Status = GetGlobalEnvironmentVariable (ConsoleVarName, NULL, NULL, (VOID**)&DevicePathInstances);\r
  if (EFI_ERROR(Status)) {\r
    // In case no default console device path has been defined we assume a driver handles the console (eg: SimpleTextInOutSerial)\r
    if ((DefaultConsolePaths == NULL) || (DefaultConsolePaths[0] == L'\0')) {\r
      *DevicePaths = NULL;\r
      return EFI_SUCCESS;\r
    }\r
\r
    Status = gBS->LocateProtocol (&gEfiDevicePathFromTextProtocolGuid, NULL, (VOID **)&EfiDevicePathFromTextProtocol);\r
    ASSERT_EFI_ERROR(Status);\r
\r
    DevicePathInstances = NULL;\r
\r
    // Extract the Device Path instances from the multi-device path string\r
    while ((DefaultConsolePaths != NULL) && (DefaultConsolePaths[0] != L'\0')) {\r
      NextDevicePathStr = StrStr (DefaultConsolePaths, L";");\r
      if (NextDevicePathStr == NULL) {\r
        DevicePathStr = DefaultConsolePaths;\r
        DefaultConsolePaths = NULL;\r
      } else {\r
        DevicePathStr = (CHAR16*)AllocateCopyPool ((NextDevicePathStr - DefaultConsolePaths + 1) * sizeof(CHAR16), DefaultConsolePaths);\r
        *(DevicePathStr + (NextDevicePathStr - DefaultConsolePaths)) = L'\0';\r
        DefaultConsolePaths = NextDevicePathStr;\r
        if (DefaultConsolePaths[0] == L';') {\r
          DefaultConsolePaths++;\r
        }\r
      }\r
\r
      DevicePathInstance = EfiDevicePathFromTextProtocol->ConvertTextToDevicePath (DevicePathStr);\r
      ASSERT(DevicePathInstance != NULL);\r
      DevicePathInstances = AppendDevicePathInstance (DevicePathInstances, DevicePathInstance);\r
\r
      if (NextDevicePathStr != NULL) {\r
        FreePool (DevicePathStr);\r
      }\r
      FreePool (DevicePathInstance);\r
    }\r
\r
    // Set the environment variable with this device path multi-instances\r
    Size = GetDevicePathSize (DevicePathInstances);\r
    if (Size > 0) {\r
      gRT->SetVariable (\r
          ConsoleVarName,\r
          &gEfiGlobalVariableGuid,\r
          EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
          Size,\r
          DevicePathInstances\r
          );\r
    } else {\r
      Status = EFI_INVALID_PARAMETER;\r
    }\r
  }\r
\r
  if (!EFI_ERROR(Status)) {\r
    *DevicePaths = DevicePathInstances;\r
  }\r
  return Status;\r
}\r
\r
STATIC\r
EFI_STATUS\r
InitializeConsolePipe (\r
  IN EFI_DEVICE_PATH    *ConsoleDevicePaths,\r
  IN EFI_GUID           *Protocol,\r
  OUT EFI_HANDLE        *Handle,\r
  OUT VOID*             *Interface\r
  )\r
{\r
  EFI_STATUS                Status;\r
  UINTN                     Size;\r
  UINTN                     NoHandles;\r
  EFI_HANDLE                *Buffer;\r
  EFI_DEVICE_PATH_PROTOCOL* DevicePath;\r
\r
  // Connect all the Device Path Consoles\r
  while (ConsoleDevicePaths != NULL) {\r
    DevicePath = GetNextDevicePathInstance (&ConsoleDevicePaths, &Size);\r
\r
    Status = BdsConnectDevicePath (DevicePath, Handle, NULL);\r
    DEBUG_CODE_BEGIN();\r
      if (EFI_ERROR(Status)) {\r
        // We convert back to the text representation of the device Path\r
        EFI_DEVICE_PATH_TO_TEXT_PROTOCOL* DevicePathToTextProtocol;\r
        CHAR16* DevicePathTxt;\r
        EFI_STATUS Status;\r
\r
        Status = gBS->LocateProtocol(&gEfiDevicePathToTextProtocolGuid, NULL, (VOID **)&DevicePathToTextProtocol);\r
        if (!EFI_ERROR(Status)) {\r
          DevicePathTxt = DevicePathToTextProtocol->ConvertDevicePathToText (DevicePath, TRUE, TRUE);\r
\r
          DEBUG((EFI_D_ERROR,"Fail to start the console with the Device Path '%s'. (Error '%r')\n", DevicePathTxt, Status));\r
\r
          FreePool (DevicePathTxt);\r
        }\r
      }\r
    DEBUG_CODE_END();\r
\r
    // If the console splitter driver is not supported by the platform then use the first Device Path\r
    // instance for the console interface.\r
    if (!EFI_ERROR(Status) && (*Interface == NULL)) {\r
      Status = gBS->HandleProtocol (*Handle, Protocol, Interface);\r
    }\r
  }\r
\r
  // No Device Path has been defined for this console interface. We take the first protocol implementation\r
  if (*Interface == NULL) {\r
    Status = gBS->LocateHandleBuffer (ByProtocol, Protocol, NULL, &NoHandles, &Buffer);\r
    if (EFI_ERROR (Status)) {\r
      BdsConnectAllDrivers();\r
      Status = gBS->LocateHandleBuffer (ByProtocol, Protocol, NULL, &NoHandles, &Buffer);\r
    }\r
\r
    if (!EFI_ERROR(Status)) {\r
      *Handle = Buffer[0];\r
      Status = gBS->HandleProtocol (*Handle, Protocol, Interface);\r
      ASSERT_EFI_ERROR(Status);\r
      FreePool (Buffer);\r
    }\r
  } else {\r
    Status = EFI_SUCCESS;\r
  }\r
\r
  return Status;\r
}\r
\r
EFI_STATUS\r
InitializeConsole (\r
  VOID\r
  )\r
{\r
  EFI_STATUS                Status;\r
  EFI_DEVICE_PATH*          ConOutDevicePaths;\r
  EFI_DEVICE_PATH*          ConInDevicePaths;\r
  EFI_DEVICE_PATH*          ConErrDevicePaths;\r
\r
  // By getting the Console Device Paths from the environment variables before initializing the console pipe, we\r
  // create the 3 environment variables (ConIn, ConOut, ConErr) that allows to initialize all the console interface\r
  // of newly installed console drivers\r
  Status = GetConsoleDevicePathFromVariable (L"ConOut", (CHAR16*)PcdGetPtr(PcdDefaultConOutPaths), &ConOutDevicePaths);\r
  ASSERT_EFI_ERROR (Status);\r
  Status = GetConsoleDevicePathFromVariable (L"ConIn", (CHAR16*)PcdGetPtr(PcdDefaultConInPaths), &ConInDevicePaths);\r
  ASSERT_EFI_ERROR (Status);\r
  Status = GetConsoleDevicePathFromVariable (L"ErrOut", (CHAR16*)PcdGetPtr(PcdDefaultConOutPaths), &ConErrDevicePaths);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  // Initialize the Consoles\r
  Status = InitializeConsolePipe (ConOutDevicePaths, &gEfiSimpleTextOutProtocolGuid, &gST->ConsoleOutHandle, (VOID **)&gST->ConOut);\r
  ASSERT_EFI_ERROR (Status);\r
  Status = InitializeConsolePipe (ConInDevicePaths, &gEfiSimpleTextInProtocolGuid, &gST->ConsoleInHandle, (VOID **)&gST->ConIn);\r
  ASSERT_EFI_ERROR (Status);\r
  Status = InitializeConsolePipe (ConErrDevicePaths, &gEfiSimpleTextOutProtocolGuid, &gST->StandardErrorHandle, (VOID **)&gST->StdErr);\r
  if (EFI_ERROR(Status)) {\r
    // In case of error, we reuse the console output for the error output\r
    gST->StandardErrorHandle = gST->ConsoleOutHandle;\r
    gST->StdErr = gST->ConOut;\r
  }\r
\r
  // Free Memory allocated for reading the UEFI Variables\r
  if (ConOutDevicePaths) {\r
    FreePool (ConOutDevicePaths);\r
  }\r
  if (ConInDevicePaths) {\r
    FreePool (ConInDevicePaths);\r
  }\r
  if (ConErrDevicePaths) {\r
    FreePool (ConErrDevicePaths);\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
EFI_STATUS\r
DefineDefaultBootEntries (\r
  VOID\r
  )\r
{\r
  BDS_LOAD_OPTION*                    BdsLoadOption;\r
  UINTN                               Size;\r
  EFI_STATUS                          Status;\r
  EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL* EfiDevicePathFromTextProtocol;\r
  EFI_DEVICE_PATH*                    BootDevicePath;\r
  UINT8*                              OptionalData;\r
  UINTN                               OptionalDataSize;\r
  ARM_BDS_LOADER_ARGUMENTS*           BootArguments;\r
  ARM_BDS_LOADER_TYPE                 BootType;\r
  EFI_DEVICE_PATH*                    InitrdPath;\r
  UINTN                               InitrdSize;\r
  UINTN                               CmdLineSize;\r
  UINTN                               CmdLineAsciiSize;\r
  CHAR16*                             DefaultBootArgument;\r
  CHAR8*                              AsciiDefaultBootArgument;\r
\r
  //\r
  // If Boot Order does not exist then create a default entry\r
  //\r
  Size = 0;\r
  Status = gRT->GetVariable (L"BootOrder", &gEfiGlobalVariableGuid, NULL, &Size, NULL);\r
  if (Status == EFI_NOT_FOUND) {\r
    if ((PcdGetPtr(PcdDefaultBootDevicePath) == NULL) || (StrLen ((CHAR16*)PcdGetPtr(PcdDefaultBootDevicePath)) == 0)) {\r
      return EFI_UNSUPPORTED;\r
    }\r
\r
    Status = gBS->LocateProtocol (&gEfiDevicePathFromTextProtocolGuid, NULL, (VOID **)&EfiDevicePathFromTextProtocol);\r
    if (EFI_ERROR(Status)) {\r
      // You must provide an implementation of DevicePathFromTextProtocol in your firmware (eg: DevicePathDxe)\r
      DEBUG((EFI_D_ERROR,"Error: Bds requires DevicePathFromTextProtocol\n"));\r
      return Status;\r
    }\r
    BootDevicePath = EfiDevicePathFromTextProtocol->ConvertTextToDevicePath ((CHAR16*)PcdGetPtr(PcdDefaultBootDevicePath));\r
\r
    DEBUG_CODE_BEGIN();\r
      // We convert back to the text representation of the device Path to see if the initial text is correct\r
      EFI_DEVICE_PATH_TO_TEXT_PROTOCOL* DevicePathToTextProtocol;\r
      CHAR16* DevicePathTxt;\r
\r
      Status = gBS->LocateProtocol(&gEfiDevicePathToTextProtocolGuid, NULL, (VOID **)&DevicePathToTextProtocol);\r
      ASSERT_EFI_ERROR(Status);\r
      DevicePathTxt = DevicePathToTextProtocol->ConvertDevicePathToText (BootDevicePath, TRUE, TRUE);\r
\r
      ASSERT (StrCmp ((CHAR16*)PcdGetPtr(PcdDefaultBootDevicePath), DevicePathTxt) == 0);\r
\r
      FreePool (DevicePathTxt);\r
    DEBUG_CODE_END();\r
\r
    // Create the entry is the Default values are correct\r
    if (BootDevicePath != NULL) {\r
      BootType = (ARM_BDS_LOADER_TYPE)PcdGet32 (PcdDefaultBootType);\r
\r
      // We do not support NULL pointer\r
      ASSERT (PcdGetPtr (PcdDefaultBootArgument) != NULL);\r
\r
      //\r
      // Logic to handle ASCII or Unicode default parameters\r
      //\r
      if (*(CHAR8*)PcdGetPtr (PcdDefaultBootArgument) == '\0') {\r
        CmdLineSize = 0;\r
        CmdLineAsciiSize = 0;\r
        DefaultBootArgument = NULL;\r
        AsciiDefaultBootArgument = NULL;\r
      } else if (IsUnicodeString ((CHAR16*)PcdGetPtr (PcdDefaultBootArgument))) {\r
        // The command line is a Unicode string\r
        DefaultBootArgument = (CHAR16*)PcdGetPtr (PcdDefaultBootArgument);\r
        CmdLineSize = StrSize (DefaultBootArgument);\r
\r
        // Initialize ASCII variables\r
        CmdLineAsciiSize = CmdLineSize / 2;\r
        AsciiDefaultBootArgument = AllocatePool (CmdLineAsciiSize);\r
        if (AsciiDefaultBootArgument == NULL) {\r
          return EFI_OUT_OF_RESOURCES;\r
        }\r
        UnicodeStrToAsciiStr ((CHAR16*)PcdGetPtr (PcdDefaultBootArgument), AsciiDefaultBootArgument);\r
      } else {\r
        // The command line is a ASCII string\r
        AsciiDefaultBootArgument = (CHAR8*)PcdGetPtr (PcdDefaultBootArgument);\r
        CmdLineAsciiSize = AsciiStrSize (AsciiDefaultBootArgument);\r
\r
        // Initialize ASCII variables\r
        CmdLineSize = CmdLineAsciiSize * 2;\r
        DefaultBootArgument = AllocatePool (CmdLineSize);\r
        if (DefaultBootArgument == NULL) {\r
          return EFI_OUT_OF_RESOURCES;\r
        }\r
        AsciiStrToUnicodeStr (AsciiDefaultBootArgument, DefaultBootArgument);\r
      }\r
\r
      if ((BootType == BDS_LOADER_KERNEL_LINUX_ATAG) || (BootType == BDS_LOADER_KERNEL_LINUX_FDT)) {\r
        InitrdPath = EfiDevicePathFromTextProtocol->ConvertTextToDevicePath ((CHAR16*)PcdGetPtr(PcdDefaultBootInitrdPath));\r
        InitrdSize = GetDevicePathSize (InitrdPath);\r
\r
        OptionalDataSize = sizeof(ARM_BDS_LOADER_ARGUMENTS) + CmdLineAsciiSize + InitrdSize;\r
        BootArguments = (ARM_BDS_LOADER_ARGUMENTS*)AllocatePool (OptionalDataSize);\r
        if (BootArguments == NULL) {\r
          return EFI_OUT_OF_RESOURCES;\r
        }\r
        BootArguments->LinuxArguments.CmdLineSize = CmdLineAsciiSize;\r
        BootArguments->LinuxArguments.InitrdSize = InitrdSize;\r
\r
        CopyMem ((VOID*)(BootArguments + 1), AsciiDefaultBootArgument, CmdLineAsciiSize);\r
        CopyMem ((VOID*)((UINTN)(BootArguments + 1) + CmdLineAsciiSize), InitrdPath, InitrdSize);\r
\r
        OptionalData = (UINT8*)BootArguments;\r
      } else {\r
        OptionalData = (UINT8*)DefaultBootArgument;\r
        OptionalDataSize = CmdLineSize;\r
      }\r
\r
      BootOptionCreate (LOAD_OPTION_ACTIVE | LOAD_OPTION_CATEGORY_BOOT,\r
        (CHAR16*)PcdGetPtr(PcdDefaultBootDescription),\r
        BootDevicePath,\r
        BootType,\r
        OptionalData,\r
        OptionalDataSize,\r
        &BdsLoadOption\r
        );\r
      FreePool (BdsLoadOption);\r
\r
      if (DefaultBootArgument == (CHAR16*)PcdGetPtr (PcdDefaultBootArgument)) {\r
        FreePool (AsciiDefaultBootArgument);\r
      } else if (DefaultBootArgument != NULL) {\r
        FreePool (DefaultBootArgument);\r
      }\r
    } else {\r
      Status = EFI_UNSUPPORTED;\r
    }\r
  }\r
\r
  return Status;\r
}\r
\r
EFI_STATUS\r
StartDefaultBootOnTimeout (\r
  VOID\r
  )\r
{\r
  UINTN               Size;\r
  UINT16              Timeout;\r
  UINT16              *TimeoutPtr;\r
  EFI_EVENT           WaitList[2];\r
  UINTN               WaitIndex;\r
  UINT16              *BootOrder;\r
  UINTN               BootOrderSize;\r
  UINTN               Index;\r
  CHAR16              BootVariableName[9];\r
  EFI_STATUS          Status;\r
  EFI_INPUT_KEY       Key;\r
\r
  Size = sizeof(UINT16);\r
  Timeout = (UINT16)PcdGet16 (PcdPlatformBootTimeOut);\r
  Status = GetGlobalEnvironmentVariable (L"Timeout", &Timeout, &Size, (VOID**)&TimeoutPtr);\r
  if (!EFI_ERROR (Status)) {\r
    Timeout = *TimeoutPtr;\r
    FreePool (TimeoutPtr);\r
  }\r
\r
  if (Timeout != 0xFFFF) {\r
    if (Timeout > 0) {\r
      // Create the waiting events (keystroke and 1sec timer)\r
      gBS->CreateEvent (EVT_TIMER, 0, NULL, NULL, &WaitList[0]);\r
      gBS->SetTimer (WaitList[0], TimerPeriodic, EFI_SET_TIMER_TO_SECOND);\r
      WaitList[1] = gST->ConIn->WaitForKey;\r
\r
      // Start the timer\r
      WaitIndex = 0;\r
      Print(L"The default boot selection will start in ");\r
      while ((Timeout > 0) && (WaitIndex == 0)) {\r
        Print(L"%3d seconds",Timeout);\r
        gBS->WaitForEvent (2, WaitList, &WaitIndex);\r
        if (WaitIndex == 0) {\r
          Print(L"\b\b\b\b\b\b\b\b\b\b\b");\r
          Timeout--;\r
        }\r
      }\r
      // Discard key in the buffer\r
      do {\r
        Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);\r
      } while(!EFI_ERROR(Status));\r
      gBS->CloseEvent (WaitList[0]);\r
      Print(L"\n\r");\r
    }\r
\r
    // In case of Timeout we start the default boot selection\r
    if (Timeout == 0) {\r
      // Get the Boot Option Order from the environment variable (a default value should have been created)\r
      GetGlobalEnvironmentVariable (L"BootOrder", NULL, &BootOrderSize, (VOID**)&BootOrder);\r
\r
      for (Index = 0; Index < BootOrderSize / sizeof (UINT16); Index++) {\r
        UnicodeSPrint (BootVariableName, 9 * sizeof(CHAR16), L"Boot%04X", BootOrder[Index]);\r
        Status = BdsStartBootOption (BootVariableName);\r
        if(!EFI_ERROR(Status)){\r
          // Boot option returned successfully, hence don't need to start next boot option\r
          break;\r
        }\r
        // In case of success, we should not return from this call.\r
      }\r
      FreePool (BootOrder);\r
    }\r
  }\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  An empty function to pass error checking of CreateEventEx ().\r
\r
  @param  Event                 Event whose notification function is being invoked.\r
  @param  Context               Pointer to the notification function's context,\r
                                which is implementation-dependent.\r
\r
**/\r
VOID\r
EFIAPI\r
EmptyCallbackFunction (\r
  IN EFI_EVENT                Event,\r
  IN VOID                     *Context\r
  )\r
{\r
  return;\r
}\r
\r
/**\r
  This function uses policy data from the platform to determine what operating\r
  system or system utility should be loaded and invoked.  This function call\r
  also optionally make the use of user input to determine the operating system\r
  or system utility to be loaded and invoked.  When the DXE Core has dispatched\r
  all the drivers on the dispatch queue, this function is called.  This\r
  function will attempt to connect the boot devices required to load and invoke\r
  the selected operating system or system utility.  During this process,\r
  additional firmware volumes may be discovered that may contain addition DXE\r
  drivers that can be dispatched by the DXE Core.   If a boot device cannot be\r
  fully connected, this function calls the DXE Service Dispatch() to allow the\r
  DXE drivers from any newly discovered firmware volumes to be dispatched.\r
  Then the boot device connection can be attempted again.  If the same boot\r
  device connection operation fails twice in a row, then that boot device has\r
  failed, and should be skipped.  This function should never return.\r
\r
  @param  This             The EFI_BDS_ARCH_PROTOCOL instance.\r
\r
  @return None.\r
\r
**/\r
VOID\r
EFIAPI\r
BdsEntry (\r
  IN EFI_BDS_ARCH_PROTOCOL  *This\r
  )\r
{\r
  UINTN               Size;\r
  EFI_STATUS          Status;\r
  UINT16             *BootNext;\r
  UINTN               BootNextSize;\r
  CHAR16              BootVariableName[9];\r
  EFI_EVENT           EndOfDxeEvent;\r
\r
  //\r
  // Signal EndOfDxe PI Event\r
  //\r
  Status = gBS->CreateEventEx (\r
      EVT_NOTIFY_SIGNAL,\r
      TPL_NOTIFY,\r
      EmptyCallbackFunction,\r
      NULL,\r
      &gEfiEndOfDxeEventGroupGuid,\r
      &EndOfDxeEvent\r
      );\r
  if (!EFI_ERROR (Status)) {\r
    gBS->SignalEvent (EndOfDxeEvent);\r
  }\r
\r
  PERF_END   (NULL, "DXE", NULL, 0);\r
\r
  //\r
  // Declare the Firmware Vendor\r
  //\r
  if (FixedPcdGetPtr(PcdFirmwareVendor) != NULL) {\r
    Size = 0x100;\r
    gST->FirmwareVendor = AllocateRuntimePool (Size);\r
    ASSERT (gST->FirmwareVendor != NULL);\r
    UnicodeSPrint (gST->FirmwareVendor, Size, L"%a EFI %a %a", PcdGetPtr(PcdFirmwareVendor), __DATE__, __TIME__);\r
  }\r
\r
  //\r
  // Fixup Table CRC after we updated Firmware Vendor\r
  //\r
  gST->Hdr.CRC32 = 0;\r
  Status = gBS->CalculateCrc32 ((VOID*)gST, gST->Hdr.HeaderSize, &gST->Hdr.CRC32);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  // If BootNext environment variable is defined then we just load it !\r
  BootNextSize = sizeof(UINT16);\r
  Status = GetGlobalEnvironmentVariable (L"BootNext", NULL, &BootNextSize, (VOID**)&BootNext);\r
  if (!EFI_ERROR(Status)) {\r
    ASSERT(BootNextSize == sizeof(UINT16));\r
\r
    // Generate the requested Boot Entry variable name\r
    UnicodeSPrint (BootVariableName, 9 * sizeof(CHAR16), L"Boot%04X", *BootNext);\r
\r
    // Set BootCurrent variable\r
    gRT->SetVariable (L"BootCurrent", &gEfiGlobalVariableGuid,\r
              EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
              BootNextSize, BootNext);\r
\r
    FreePool (BootNext);\r
\r
    // Start the requested Boot Entry\r
    Status = BdsStartBootOption (BootVariableName);\r
    if (Status != EFI_NOT_FOUND) {\r
      // BootNext has not been succeeded launched\r
      if (EFI_ERROR(Status)) {\r
        Print(L"Fail to start BootNext.\n");\r
      }\r
\r
      // Delete the BootNext environment variable\r
      gRT->SetVariable (L"BootNext", &gEfiGlobalVariableGuid,\r
          EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
          0, NULL);\r
    }\r
\r
    // Clear BootCurrent variable\r
    gRT->SetVariable (L"BootCurrent", &gEfiGlobalVariableGuid,\r
        EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
        0, NULL);\r
  }\r
\r
  // If Boot Order does not exist then create a default entry\r
  DefineDefaultBootEntries ();\r
\r
  // Now we need to setup the EFI System Table with information about the console devices.\r
  InitializeConsole ();\r
\r
  //\r
  // Update the CRC32 in the EFI System Table header\r
  //\r
  gST->Hdr.CRC32 = 0;\r
  Status = gBS->CalculateCrc32 ((VOID*)gST, gST->Hdr.HeaderSize, &gST->Hdr.CRC32);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  // Timer before initiating the default boot selection\r
  StartDefaultBootOnTimeout ();\r
\r
  // Start the Boot Menu\r
  Status = BootMenuMain ();\r
  ASSERT_EFI_ERROR (Status);\r
\r
}\r
\r
EFI_BDS_ARCH_PROTOCOL  gBdsProtocol = {\r
  BdsEntry,\r
};\r
\r
EFI_STATUS\r
EFIAPI\r
BdsInitialize (\r
  IN EFI_HANDLE                            ImageHandle,\r
  IN EFI_SYSTEM_TABLE                      *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &ImageHandle,\r
                  &gEfiBdsArchProtocolGuid, &gBdsProtocol,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r