text: /** @file
    The boot manager reference implementation
  
  Copyright (c) 2004 - 2016, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials are licensed and made available under
  the terms and conditions of the BSD License that accompanies this distribution.
  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.
  
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  
  #include "BootManager.h"
  
  UINT16             mKeyInput;
  EFI_GUID           mBootManagerGuid = BOOT_MANAGER_FORMSET_GUID;
  //
  // Boot video resolution and text mode.
  //
  UINT32    mBmBootHorizontalResolution    = 0;
  UINT32    mBmBootVerticalResolution      = 0;
  UINT32    mBmBootTextModeColumn          = 0;
  UINT32    mBmBootTextModeRow             = 0;
  //
  // BIOS setup video resolution and text mode.
  //
  UINT32    mBmSetupTextModeColumn         = 0;
  UINT32    mBmSetupTextModeRow            = 0;
  UINT32    mBmSetupHorizontalResolution   = 0;
  UINT32    mBmSetupVerticalResolution     = 0;
  
  BOOLEAN   mBmModeInitialized             = FALSE;
  
  CHAR16             *mDeviceTypeStr[] = {
    L"Legacy BEV",
    L"Legacy Floppy",
    L"Legacy Hard Drive",
    L"Legacy CD ROM",
    L"Legacy PCMCIA",
    L"Legacy USB",
    L"Legacy Embedded Network",
    L"Legacy Unknown Device"
  };
  
  HII_VENDOR_DEVICE_PATH  mBootManagerHiiVendorDevicePath = {
    {
      {
        HARDWARE_DEVICE_PATH,
        HW_VENDOR_DP,
        {
          (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
          (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
        }
      },
      //
      // {1DDDBE15-481D-4d2b-8277-B191EAF66525}
      //
      { 0x1dddbe15, 0x481d, 0x4d2b, { 0x82, 0x77, 0xb1, 0x91, 0xea, 0xf6, 0x65, 0x25 } }
    },
    {
      END_DEVICE_PATH_TYPE,
      END_ENTIRE_DEVICE_PATH_SUBTYPE,
      { 
        (UINT8) (END_DEVICE_PATH_LENGTH),
        (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
      }
    }
  };
  
  BOOT_MANAGER_CALLBACK_DATA  gBootManagerPrivate = {
    BOOT_MANAGER_CALLBACK_DATA_SIGNATURE,
    NULL,
    NULL,
    {
      BootManagerExtractConfig,
      BootManagerRouteConfig,
      BootManagerCallback
    }
  };
  
  /**
    This function will change video resolution and text mode
    according to defined setup mode or defined boot mode  
  
    @param  IsSetupMode   Indicate mode is changed to setup mode or boot mode. 
  
    @retval  EFI_SUCCESS  Mode is changed successfully.
    @retval  Others             Mode failed to be changed.
  
  **/
  EFI_STATUS
  BmSetConsoleMode (
    BOOLEAN  IsSetupMode
    )
  {
    EFI_GRAPHICS_OUTPUT_PROTOCOL          *GraphicsOutput;
    EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL       *SimpleTextOut;
    UINTN                                 SizeOfInfo;
    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION  *Info;
    UINT32                                MaxGopMode;
    UINT32                                MaxTextMode;
    UINT32                                ModeNumber;
    UINT32                                NewHorizontalResolution;
    UINT32                                NewVerticalResolution;
    UINT32                                NewColumns;
    UINT32                                NewRows;
    UINTN                                 HandleCount;
    EFI_HANDLE                            *HandleBuffer;
    EFI_STATUS                            Status;
    UINTN                                 Index;
    UINTN                                 CurrentColumn;
    UINTN                                 CurrentRow;  
  
    MaxGopMode  = 0;
    MaxTextMode = 0;
  
    //
    // Get current video resolution and text mode 
    //
    Status = gBS->HandleProtocol (
                    gST->ConsoleOutHandle,
                    &gEfiGraphicsOutputProtocolGuid,
                    (VOID**)&GraphicsOutput
                    );
    if (EFI_ERROR (Status)) {
      GraphicsOutput = NULL;
    }
  
    Status = gBS->HandleProtocol (
                    gST->ConsoleOutHandle,
                    &gEfiSimpleTextOutProtocolGuid,
                    (VOID**)&SimpleTextOut
                    );
    if (EFI_ERROR (Status)) {
      SimpleTextOut = NULL;
    }
  
    if ((GraphicsOutput == NULL) || (SimpleTextOut == NULL)) {
      return EFI_UNSUPPORTED;
    }
  
    if (IsSetupMode) {
      //
      // The required resolution and text mode is setup mode.
      //
      NewHorizontalResolution = mBmSetupHorizontalResolution;
      NewVerticalResolution   = mBmSetupVerticalResolution;
      NewColumns              = mBmSetupTextModeColumn;
      NewRows                 = mBmSetupTextModeRow;
    } else {
      //
      // The required resolution and text mode is boot mode.
      //
      NewHorizontalResolution = mBmBootHorizontalResolution;
      NewVerticalResolution   = mBmBootVerticalResolution;
      NewColumns              = mBmBootTextModeColumn;
      NewRows                 = mBmBootTextModeRow;   
    }
  
    if (GraphicsOutput != NULL) {
      MaxGopMode  = GraphicsOutput->Mode->MaxMode;
    }
  
    if (SimpleTextOut != NULL) {
      MaxTextMode = SimpleTextOut->Mode->MaxMode;
    }
  
    //
    // 1. If current video resolution is same with required video resolution,
    //    video resolution need not be changed.
    //    1.1. If current text mode is same with required text mode, text mode need not be changed.
    //    1.2. If current text mode is different from required text mode, text mode need be changed.
    // 2. If current video resolution is different from required video resolution, we need restart whole console drivers.
    //
    for (ModeNumber = 0; ModeNumber < MaxGopMode; ModeNumber++) {
      Status = GraphicsOutput->QueryMode (
                         GraphicsOutput,
                         ModeNumber,
                         &SizeOfInfo,
                         &Info
                         );
      if (!EFI_ERROR (Status)) {
        if ((Info->HorizontalResolution == NewHorizontalResolution) &&
            (Info->VerticalResolution == NewVerticalResolution)) {
          if ((GraphicsOutput->Mode->Info->HorizontalResolution == NewHorizontalResolution) &&
              (GraphicsOutput->Mode->Info->VerticalResolution == NewVerticalResolution)) {
            //
            // Current resolution is same with required resolution, check if text mode need be set
            //
            Status = SimpleTextOut->QueryMode (SimpleTextOut, SimpleTextOut->Mode->Mode, &CurrentColumn, &CurrentRow);
            ASSERT_EFI_ERROR (Status);
            if (CurrentColumn == NewColumns && CurrentRow == NewRows) {
              //
              // If current text mode is same with required text mode. Do nothing
              //
              FreePool (Info);
              return EFI_SUCCESS;
            } else {
              //
              // If current text mode is different from required text mode.  Set new video mode
              //
              for (Index = 0; Index < MaxTextMode; Index++) {
                Status = SimpleTextOut->QueryMode (SimpleTextOut, Index, &CurrentColumn, &CurrentRow);
                if (!EFI_ERROR(Status)) {
                  if ((CurrentColumn == NewColumns) && (CurrentRow == NewRows)) {
                    //
                    // Required text mode is supported, set it.
                    //
                    Status = SimpleTextOut->SetMode (SimpleTextOut, Index);
                    ASSERT_EFI_ERROR (Status);
                    //
                    // Update text mode PCD.
                    //
                    Status = PcdSet32S (PcdConOutColumn, mBmSetupTextModeColumn);
                    ASSERT_EFI_ERROR (Status);
                    Status = PcdSet32S (PcdConOutRow, mBmSetupTextModeRow);
                    ASSERT_EFI_ERROR (Status);
                    FreePool (Info);
                    return EFI_SUCCESS;
                  }
                }
              }
              if (Index == MaxTextMode) {
                //
                // If required text mode is not supported, return error.
                //
                FreePool (Info);
                return EFI_UNSUPPORTED;
              }
            }
          } else {
            //
            // If current video resolution is not same with the new one, set new video resolution.
            // In this case, the driver which produces simple text out need be restarted.
            //
            Status = GraphicsOutput->SetMode (GraphicsOutput, ModeNumber);
            if (!EFI_ERROR (Status)) {
              FreePool (Info);
              break;
            }
          }
        }
        FreePool (Info);
      }
    }
  
    if (ModeNumber == MaxGopMode) {
      //
      // If the resolution is not supported, return error.
      //
      return EFI_UNSUPPORTED;
    }
  
    //
    // Set PCD to Inform GraphicsConsole to change video resolution.
    // Set PCD to Inform Consplitter to change text mode.
    //
    Status = PcdSet32S (PcdVideoHorizontalResolution, NewHorizontalResolution);
    ASSERT_EFI_ERROR (Status);
    Status = PcdSet32S (PcdVideoVerticalResolution, NewVerticalResolution);
    ASSERT_EFI_ERROR (Status);
    Status = PcdSet32S (PcdConOutColumn, NewColumns);
    ASSERT_EFI_ERROR (Status);
    Status = PcdSet32S (PcdConOutRow, NewRows);
    ASSERT_EFI_ERROR (Status);
  
    //
    // Video mode is changed, so restart graphics console driver and higher level driver.
    // Reconnect graphics console driver and higher level driver.
    // Locate all the handles with GOP protocol and reconnect it.
    //
    Status = gBS->LocateHandleBuffer (
                     ByProtocol,
                     &gEfiSimpleTextOutProtocolGuid,
                     NULL,
                     &HandleCount,
                     &HandleBuffer
                     );
    if (!EFI_ERROR (Status)) {
      for (Index = 0; Index < HandleCount; Index++) {
        gBS->DisconnectController (HandleBuffer[Index], NULL, NULL);
      }
      for (Index = 0; Index < HandleCount; Index++) {
        gBS->ConnectController (HandleBuffer[Index], NULL, NULL, TRUE);
      }
      if (HandleBuffer != NULL) {
        FreePool (HandleBuffer);
      }
    }
  
    return EFI_SUCCESS;
  }
  
  /**
    Group the legacy boot options in the BootOption.
  
    The routine assumes the boot options in the beginning that covers all the device 
    types are ordered properly and re-position the following boot options just after
    the corresponding boot options with the same device type.
    For example:
    1. Input  = [Harddisk1 CdRom2 Efi1 Harddisk0 CdRom0 CdRom1 Harddisk2 Efi0]
       Assuming [Harddisk1 CdRom2 Efi1] is ordered properly
       Output = [Harddisk1 Harddisk0 Harddisk2 CdRom2 CdRom0 CdRom1 Efi1 Efi0]
  
    2. Input  = [Efi1 Efi0 CdRom1 Harddisk0 Harddisk1 Harddisk2 CdRom0 CdRom2]
       Assuming [Efi1 Efi0 CdRom1 Harddisk0] is ordered properly
       Output = [Efi1 Efi0 CdRom1 CdRom0 CdRom2 Harddisk0 Harddisk1 Harddisk2]
  
  **/
  VOID
  GroupMultipleLegacyBootOption4SameType (
    VOID
    )
  {
    EFI_STATUS                   Status;
    UINTN                        Index;
    UINTN                        DeviceIndex;
    UINTN                        DeviceTypeIndex[7];
    UINTN                        *NextIndex;
    UINT16                       OptionNumber;
    UINT16                       *BootOrder;
    UINTN                        BootOrderSize;
    CHAR16                       OptionName[sizeof ("Boot####")];
    EFI_BOOT_MANAGER_LOAD_OPTION BootOption;
  
    SetMem (DeviceTypeIndex, sizeof (DeviceTypeIndex), 0xff);
  
    GetEfiGlobalVariable2 (L"BootOrder", (VOID **) &BootOrder, &BootOrderSize);
    if (BootOrder == NULL) {
      return;
    }
  
    for (Index = 0; Index < BootOrderSize / sizeof (UINT16); Index++) {
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", BootOrder[Index]);
      Status = EfiBootManagerVariableToLoadOption (OptionName, &BootOption);
      ASSERT_EFI_ERROR (Status);
  
      if ((DevicePathType (BootOption.FilePath) == BBS_DEVICE_PATH) &&
          (DevicePathSubType (BootOption.FilePath) == BBS_BBS_DP)) {
        //
        // Legacy Boot Option
        //
        DEBUG ((EFI_D_ERROR, "[BootManagerDxe] ==== Find Legacy Boot Option  0x%x! ==== \n", Index));
        ASSERT ((((BBS_BBS_DEVICE_PATH *) BootOption.FilePath)->DeviceType & 0xF) < ARRAY_SIZE (DeviceTypeIndex));
        NextIndex = &DeviceTypeIndex[((BBS_BBS_DEVICE_PATH *) BootOption.FilePath)->DeviceType & 0xF];
  
        if (*NextIndex == (UINTN) -1) {
          //
          // *NextIndex is the Index in BootOrder to put the next Option Number for the same type
          //
          *NextIndex = Index + 1;
        } else {
          //
          // insert the current boot option before *NextIndex, causing [*Next .. Index] shift right one position
          //
          OptionNumber = BootOrder[Index];
          CopyMem (&BootOrder[*NextIndex + 1], &BootOrder[*NextIndex], (Index - *NextIndex) * sizeof (UINT16));
          BootOrder[*NextIndex] = OptionNumber;
  
          //
          // Update the DeviceTypeIndex array to reflect the right shift operation
          //
          for (DeviceIndex = 0; DeviceIndex < ARRAY_SIZE (DeviceTypeIndex); DeviceIndex++) {
            if (DeviceTypeIndex[DeviceIndex] != (UINTN) -1 && DeviceTypeIndex[DeviceIndex] >= *NextIndex) {
              DeviceTypeIndex[DeviceIndex]++;
            }
          }
        }
      }
      EfiBootManagerFreeLoadOption (&BootOption);
    }
  
    gRT->SetVariable (
           L"BootOrder",
           &gEfiGlobalVariableGuid,
           VAR_FLAG,
           BootOrderSize,
           BootOrder
           );
    FreePool (BootOrder);
  }
  
  /**
    This function converts an input device structure to a Unicode string.
  
    @param DevPath                  A pointer to the device path structure.
  
    @return A new allocated Unicode string that represents the device path.
  
  **/
  CHAR16 *
  BmDevicePathToStr (
    IN EFI_DEVICE_PATH_PROTOCOL     *DevPath
    )
  {
    EFI_STATUS                       Status;
    CHAR16                           *ToText;
    EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *DevPathToText;
  
    if (DevPath == NULL) {
      return NULL;
    }
  
    Status = gBS->LocateProtocol (
                    &gEfiDevicePathToTextProtocolGuid,
                    NULL,
                    (VOID **) &DevPathToText
                    );
    ASSERT_EFI_ERROR (Status);
    ToText = DevPathToText->ConvertDevicePathToText (
                              DevPath,
                              FALSE,
                              TRUE
                              );
    ASSERT (ToText != NULL);
    return ToText;
  }
  
  /**
    This function invokes Boot Manager. It then enumerate all boot options. If
    a boot option from the Boot Manager page is selected, Boot Manager will boot
    from this boot option.
    
  **/
  VOID
  UpdateBootManager (
    VOID
    )
  {
    UINTN                         Index;
    EFI_BOOT_MANAGER_LOAD_OPTION  *BootOption;
    UINTN                         BootOptionCount;
    EFI_STRING_ID                 Token;
    CHAR16                        *HelpString;
    EFI_STRING_ID                 HelpToken;
    UINT16                        *TempStr;
    EFI_HII_HANDLE                HiiHandle;
    UINTN                         TempSize;
    VOID                          *StartOpCodeHandle;
    VOID                          *EndOpCodeHandle;
    EFI_IFR_GUID_LABEL            *StartLabel;
    EFI_IFR_GUID_LABEL            *EndLabel;
    UINT16                        DeviceType;
    BOOLEAN                       IsLegacyOption;
    BOOLEAN                       NeedEndOp;
    UINTN                         MaxLen;
  
    DeviceType = (UINT16) -1;
  
    //
    // for better user experience
    // 1. User changes HD configuration (e.g.: unplug HDD), here we have a chance to remove the HDD boot option
    // 2. User enables/disables UEFI PXE, here we have a chance to add/remove EFI Network boot option
    //
    EfiBootManagerRefreshAllBootOption ();
  
    //
    // BdsDxe doesn't group the legacy boot options for the same device type
    // It's UI's choice.
    //
    GroupMultipleLegacyBootOption4SameType ();
  
    BootOption = EfiBootManagerGetLoadOptions (&BootOptionCount, LoadOptionTypeBoot);
  
    HiiHandle = gBootManagerPrivate.HiiHandle;
  
    //
    // Allocate space for creation of UpdateData Buffer
    //
    StartOpCodeHandle = HiiAllocateOpCodeHandle ();
    ASSERT (StartOpCodeHandle != NULL);
  
    EndOpCodeHandle = HiiAllocateOpCodeHandle ();
    ASSERT (EndOpCodeHandle != NULL);
  
    //
    // Create Hii Extend Label OpCode as the start opcode
    //
    StartLabel = (EFI_IFR_GUID_LABEL *) HiiCreateGuidOpCode (StartOpCodeHandle, &gEfiIfrTianoGuid, NULL, sizeof (EFI_IFR_GUID_LABEL));
    StartLabel->ExtendOpCode = EFI_IFR_EXTEND_OP_LABEL;
    StartLabel->Number       = LABEL_BOOT_OPTION;
  
    //
    // Create Hii Extend Label OpCode as the end opcode
    //
    EndLabel = (EFI_IFR_GUID_LABEL *) HiiCreateGuidOpCode (EndOpCodeHandle, &gEfiIfrTianoGuid, NULL, sizeof (EFI_IFR_GUID_LABEL));
    EndLabel->ExtendOpCode = EFI_IFR_EXTEND_OP_LABEL;
    EndLabel->Number       = LABEL_BOOT_OPTION_END;
    mKeyInput = 0;
    NeedEndOp = FALSE;
    for (Index = 0; Index < BootOptionCount; Index++) {
      //
      // At this stage we are creating a menu entry, thus the Keys are reproduceable
      //
      mKeyInput++;
  
      //
      // Don't display the hidden/inactive boot option
      //
      if (((BootOption[Index].Attributes & LOAD_OPTION_HIDDEN) != 0) || ((BootOption[Index].Attributes & LOAD_OPTION_ACTIVE) == 0)) {
        continue;
      }
  
      //
      // Group the legacy boot option in the sub title created dynamically
      //
      IsLegacyOption = (BOOLEAN) (
                         (DevicePathType (BootOption[Index].FilePath) == BBS_DEVICE_PATH) &&
                         (DevicePathSubType (BootOption[Index].FilePath) == BBS_BBS_DP)
                         );
  
      if (!IsLegacyOption && NeedEndOp) {
        NeedEndOp = FALSE;
        HiiCreateEndOpCode (StartOpCodeHandle);
      }
      
      if (IsLegacyOption && DeviceType != ((BBS_BBS_DEVICE_PATH *) BootOption[Index].FilePath)->DeviceType) {
        if (NeedEndOp) {
          HiiCreateEndOpCode (StartOpCodeHandle);
        }
  
        DeviceType = ((BBS_BBS_DEVICE_PATH *) BootOption[Index].FilePath)->DeviceType;
        Token      = HiiSetString (
                       HiiHandle,
                       0,
                       mDeviceTypeStr[
                         MIN (DeviceType & 0xF, ARRAY_SIZE (mDeviceTypeStr) - 1)
                         ],
                       NULL
                       );
        HiiCreateSubTitleOpCode (StartOpCodeHandle, Token, 0, 0, 1);
        NeedEndOp = TRUE;
      }
  
      ASSERT (BootOption[Index].Description != NULL);
  
      Token = HiiSetString (HiiHandle, 0, BootOption[Index].Description, NULL);
  
      TempStr = BmDevicePathToStr (BootOption[Index].FilePath);
      TempSize = StrSize (TempStr);
      HelpString = AllocateZeroPool (TempSize + StrSize (L"Device Path : "));
      MaxLen = (TempSize + StrSize (L"Device Path : "))/sizeof(CHAR16);
      ASSERT (HelpString != NULL);
      StrCatS (HelpString, MaxLen, L"Device Path : ");
      StrCatS (HelpString, MaxLen, TempStr);
  
      HelpToken = HiiSetString (HiiHandle, 0, HelpString, NULL);
  
      HiiCreateActionOpCode (
        StartOpCodeHandle,
        mKeyInput,
        Token,
        HelpToken,
        EFI_IFR_FLAG_CALLBACK,
        0
        );
    }
  
    if (NeedEndOp) {
      HiiCreateEndOpCode (StartOpCodeHandle);
    }
  
    HiiUpdateForm (
      HiiHandle,
      &mBootManagerGuid,
      BOOT_MANAGER_FORM_ID,
      StartOpCodeHandle,
      EndOpCodeHandle
      );
  
    HiiFreeOpCodeHandle (StartOpCodeHandle);
    HiiFreeOpCodeHandle (EndOpCodeHandle);
  
    EfiBootManagerFreeLoadOptions (BootOption, BootOptionCount);
  }
  
  /**
    This function allows a caller to extract the current configuration for one
    or more named elements from the target driver.
  
  
    @param This            Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
    @param Request         A null-terminated Unicode string in <ConfigRequest> format.
    @param Progress        On return, points to a character in the Request string.
                           Points to the string's null terminator if request was successful.
                           Points to the most recent '&' before the first failing name/value
                           pair (or the beginning of the string if the failure is in the
                           first name/value pair) if the request was not successful.
    @param Results         A null-terminated Unicode string in <ConfigAltResp> format which
                           has all values filled in for the names in the Request string.
                           String to be allocated by the called function.
  
    @retval  EFI_SUCCESS            The Results is filled with the requested values.
    @retval  EFI_OUT_OF_RESOURCES   Not enough memory to store the results.
    @retval  EFI_INVALID_PARAMETER  Request is illegal syntax, or unknown name.
    @retval  EFI_NOT_FOUND          Routing data doesn't match any storage in this driver.
  
  **/
  EFI_STATUS
  EFIAPI
  BootManagerExtractConfig (
    IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
    IN  CONST EFI_STRING                       Request,
    OUT EFI_STRING                             *Progress,
    OUT EFI_STRING                             *Results
    )
  {
    if (Progress == NULL || Results == NULL) {
      return EFI_INVALID_PARAMETER;
    }
    *Progress = Request;
    return EFI_NOT_FOUND;
  }
  
  /**
    This function processes the results of changes in configuration.
  
  
    @param This            Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
    @param Configuration   A null-terminated Unicode string in <ConfigResp> format.
    @param Progress        A pointer to a string filled in with the offset of the most
                           recent '&' before the first failing name/value pair (or the
                           beginning of the string if the failure is in the first
                           name/value pair) or the terminating NULL if all was successful.
  
    @retval  EFI_SUCCESS            The Results is processed successfully.
    @retval  EFI_INVALID_PARAMETER  Configuration is NULL.
    @retval  EFI_NOT_FOUND          Routing data doesn't match any storage in this driver.
  
  **/
  EFI_STATUS
  EFIAPI
  BootManagerRouteConfig (
    IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
    IN  CONST EFI_STRING                       Configuration,
    OUT EFI_STRING                             *Progress
    )
  {
    if (Configuration == NULL || Progress == NULL) {
      return EFI_INVALID_PARAMETER;
    }
  
    *Progress = Configuration;
  
    return EFI_NOT_FOUND;
  }
  
  /**
    Initial the boot mode related parameters.
  
  **/
  VOID
  BmInitialBootModeInfo (
    VOID
    )
  {
    EFI_STATUS                         Status;
    EFI_GRAPHICS_OUTPUT_PROTOCOL       *GraphicsOutput;
    EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL    *SimpleTextOut;
    UINTN                              BootTextColumn;
    UINTN                              BootTextRow;
  
    if (mBmModeInitialized) {
      return;
    }
  
    //
    // After the console is ready, get current video resolution
    // and text mode before launching setup at first time.
    //
    Status = gBS->HandleProtocol (
                    gST->ConsoleOutHandle,
                    &gEfiGraphicsOutputProtocolGuid,
                    (VOID**)&GraphicsOutput
                    );
    if (EFI_ERROR (Status)) {
      GraphicsOutput = NULL;
    }
  
    Status = gBS->HandleProtocol (
                    gST->ConsoleOutHandle,
                    &gEfiSimpleTextOutProtocolGuid,
                    (VOID**)&SimpleTextOut
                    );
    if (EFI_ERROR (Status)) {
      SimpleTextOut = NULL;
    }
  
    if (GraphicsOutput != NULL) {
      //
      // Get current video resolution and text mode.
      //
      mBmBootHorizontalResolution = GraphicsOutput->Mode->Info->HorizontalResolution;
      mBmBootVerticalResolution   = GraphicsOutput->Mode->Info->VerticalResolution;
    }
  
    if (SimpleTextOut != NULL) {
      Status = SimpleTextOut->QueryMode (
                                SimpleTextOut,
                                SimpleTextOut->Mode->Mode,
                                &BootTextColumn,
                                &BootTextRow
                                );
      mBmBootTextModeColumn = (UINT32)BootTextColumn;
      mBmBootTextModeRow    = (UINT32)BootTextRow;
    }
  
    //
    // Get user defined text mode for setup.
    //
    mBmSetupHorizontalResolution = PcdGet32 (PcdSetupVideoHorizontalResolution);
    mBmSetupVerticalResolution   = PcdGet32 (PcdSetupVideoVerticalResolution);
    mBmSetupTextModeColumn       = PcdGet32 (PcdSetupConOutColumn);
    mBmSetupTextModeRow          = PcdGet32 (PcdSetupConOutRow);
  
    mBmModeInitialized           = TRUE;
  }
  
  /**
    This call back function is registered with Boot Manager formset.
    When user selects a boot option, this call back function will
    be triggered. The boot option is saved for later processing.
  
  
    @param This            Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
    @param Action          Specifies the type of action taken by the browser.
    @param QuestionId      A unique value which is sent to the original exporting driver
                           so that it can identify the type of data to expect.
    @param Type            The type of value for the question.
    @param Value           A pointer to the data being sent to the original exporting driver.
    @param ActionRequest   On return, points to the action requested by the callback function.
  
    @retval  EFI_SUCCESS           The callback successfully handled the action.
    @retval  EFI_INVALID_PARAMETER The setup browser call this function with invalid parameters.
  
  **/
  EFI_STATUS
  EFIAPI
  BootManagerCallback (
    IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
    IN  EFI_BROWSER_ACTION                     Action,
    IN  EFI_QUESTION_ID                        QuestionId,
    IN  UINT8                                  Type,
    IN  EFI_IFR_TYPE_VALUE                     *Value,
    OUT EFI_BROWSER_ACTION_REQUEST             *ActionRequest
    )
  {
    EFI_BOOT_MANAGER_LOAD_OPTION *BootOption;
    UINTN                        BootOptionCount;
    EFI_INPUT_KEY                Key;
  
    if (Action == EFI_BROWSER_ACTION_FORM_OPEN) {
      //
      //Means enter the boot manager form.
      //Update the boot manage page,because the boot option may changed.
      //
      if (QuestionId == 0x1212){
        UpdateBootManager();
      }
      return EFI_SUCCESS;
    }
  
    if (Action != EFI_BROWSER_ACTION_CHANGED) {
      //
      // Do nothing for other UEFI Action. Only do call back when data is changed.
      //
      return EFI_UNSUPPORTED;
    }
  
    if ((Value == NULL) || (ActionRequest == NULL)) {
      return EFI_INVALID_PARAMETER;
    }
  
    BootOption = EfiBootManagerGetLoadOptions (&BootOptionCount, LoadOptionTypeBoot);
  
    //
    // Clear  the  screen  before.
    //
    gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
    gST->ConOut->ClearScreen (gST->ConOut);
  
    //
    // parse the selected option
    //
    BmSetConsoleMode (FALSE);
    EfiBootManagerBoot (&BootOption[QuestionId - 1]);
    BmSetConsoleMode (TRUE);
  
    if (EFI_ERROR (BootOption[QuestionId - 1].Status)) {
      gST->ConOut->OutputString (
                    gST->ConOut,
                    HiiGetString (gBootManagerPrivate.HiiHandle, STRING_TOKEN (STR_ANY_KEY_CONTINUE), NULL)
                    );
      gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
    }
  
    EfiBootManagerFreeLoadOptions (BootOption, BootOptionCount);
  
    return EFI_SUCCESS;
  }
  
  /**
  
    Install Boot Manager Menu driver.
  
    @param ImageHandle     The image handle.
    @param SystemTable     The system table.
  
    @retval  EFI_SUCEESS  Install Boot manager menu success.
    @retval  Other        Return error status.
  
  **/
  EFI_STATUS
  EFIAPI
  BootManagerUiLibConstructor (
    IN EFI_HANDLE                            ImageHandle,
    IN EFI_SYSTEM_TABLE                      *SystemTable
    )
  {
    EFI_STATUS                     Status;
  
    //
    // Install Device Path Protocol and Config Access protocol to driver handle
    //
    gBootManagerPrivate.DriverHandle = NULL;
    Status = gBS->InstallMultipleProtocolInterfaces (
                    &gBootManagerPrivate.DriverHandle,
                    &gEfiDevicePathProtocolGuid,
                    &mBootManagerHiiVendorDevicePath,
                    &gEfiHiiConfigAccessProtocolGuid,
                    &gBootManagerPrivate.ConfigAccess,
                    NULL
                    );
    ASSERT_EFI_ERROR (Status);
  
    //
    // Publish our HII data
    //
    gBootManagerPrivate.HiiHandle = HiiAddPackages (
                                      &mBootManagerGuid,
                                      gBootManagerPrivate.DriverHandle,
                                      BootManagerVfrBin,
                                      BootManagerUiLibStrings,
                                      NULL
                                      );
    ASSERT (gBootManagerPrivate.HiiHandle != NULL);
  
    BmInitialBootModeInfo ();
  
    return EFI_SUCCESS;
  }
  
  /**
    Unloads the application and its installed protocol.
  
    @param[in]  ImageHandle       Handle that identifies the image to be unloaded.
    @param[in]  SystemTable       System Table
  
    @retval EFI_SUCCESS           The image has been unloaded.
  **/
  EFI_STATUS
  EFIAPI
  BootManagerUiLibDestructor (
    IN EFI_HANDLE                            ImageHandle,
    IN EFI_SYSTEM_TABLE                      *SystemTable
    )
  {
    EFI_STATUS    Status;
  
    Status = gBS->UninstallMultipleProtocolInterfaces (
                    gBootManagerPrivate.DriverHandle,
                    &gEfiDevicePathProtocolGuid,
                    &mBootManagerHiiVendorDevicePath,
                    &gEfiHiiConfigAccessProtocolGuid,
                    &gBootManagerPrivate.ConfigAccess,
                    NULL
                    );
    ASSERT_EFI_ERROR (Status);
  
    HiiRemovePackages (gBootManagerPrivate.HiiHandle);
  
    return EFI_SUCCESS;
  }
  
  