/** @file
  The functions for Boot Maintainence Main menu.

Copyright (c) 2004 - 2011, 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
which 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 "BootMaint.h"
#include "FormGuid.h"
#include "Bds.h"
#include "FrontPage.h"

EFI_DEVICE_PATH_PROTOCOL  EndDevicePath[] = {
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    {
      END_DEVICE_PATH_LENGTH,
      0
    }
  }
};

HII_VENDOR_DEVICE_PATH  mBmmHiiVendorDevicePath = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_VENDOR_DP,
      {
        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
      }
    },
    //
    // {165A028F-0BB2-4b5f-8747-77592E3F6499}
    //
    { 0x165a028f, 0xbb2, 0x4b5f, { 0x87, 0x47, 0x77, 0x59, 0x2e, 0x3f, 0x64, 0x99 } }
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    { 
      (UINT8) (END_DEVICE_PATH_LENGTH),
      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
    }
  }
};

HII_VENDOR_DEVICE_PATH  mFeHiiVendorDevicePath = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_VENDOR_DP,
      {
        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
      }
    },
    //
    // {91DB4238-B0C8-472e-BBCF-F3A6541010F4}
    //
    { 0x91db4238, 0xb0c8, 0x472e, { 0xbb, 0xcf, 0xf3, 0xa6, 0x54, 0x10, 0x10, 0xf4 } }
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    { 
      (UINT8) (END_DEVICE_PATH_LENGTH),
      (UINT8) ((END_DEVICE_PATH_LENGTH) >> 8)
    }
  }
};

EFI_GUID EfiLegacyDevOrderGuid  = EFI_LEGACY_DEV_ORDER_VARIABLE_GUID;
EFI_GUID mBootMaintGuid         = BOOT_MAINT_FORMSET_GUID;
EFI_GUID mFileExplorerGuid      = FILE_EXPLORE_FORMSET_GUID;

CHAR16  mBootMaintStorageName[]     = L"BmmData";
CHAR16  mFileExplorerStorageName[]  = L"FeData";

/**
  Init all memu.

  @param CallbackData    The BMM context data.

**/
VOID
InitAllMenu (
  IN  BMM_CALLBACK_DATA    *CallbackData
  );

/**
  Free up all Menu Option list.

**/
VOID
FreeAllMenu (
  VOID
  );

/**
  Create string tokens for a menu from its help strings and display strings

  @param CallbackData       The BMM context data.
  @param HiiHandle          Hii Handle of the package to be updated.
  @param MenuOption         The Menu whose string tokens need to be created

  @retval  EFI_SUCCESS      String tokens created successfully
  @retval  others           contain some errors
**/
EFI_STATUS
CreateMenuStringToken (
  IN BMM_CALLBACK_DATA                *CallbackData,
  IN EFI_HII_HANDLE                   HiiHandle,
  IN BM_MENU_OPTION                   *MenuOption
  )
{
  BM_MENU_ENTRY *NewMenuEntry;
  UINTN         Index;

  for (Index = 0; Index < MenuOption->MenuNumber; Index++) {
    NewMenuEntry = BOpt_GetMenuEntry (MenuOption, Index);

    NewMenuEntry->DisplayStringToken = HiiSetString (
                                         HiiHandle,
                                         0,
                                         NewMenuEntry->DisplayString,
                                         NULL
                                         );

    if (NULL == NewMenuEntry->HelpString) {
      NewMenuEntry->HelpStringToken = NewMenuEntry->DisplayStringToken;
    } else {
      NewMenuEntry->HelpStringToken = HiiSetString (
                                        HiiHandle,
                                        0,
                                        NewMenuEntry->HelpString,
                                        NULL
                                        );
    }
  }

  return EFI_SUCCESS;
}

/**
  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 NULL, illegal syntax, or unknown name.
  @retval  EFI_NOT_FOUND          Routing data doesn't match any storage in this driver.

**/
EFI_STATUS
EFIAPI
BootMaintExtractConfig (
  IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
  IN  CONST EFI_STRING                       Request,
  OUT EFI_STRING                             *Progress,
  OUT EFI_STRING                             *Results
  )
{
  EFI_STATUS         Status;
  UINTN              BufferSize;
  BMM_CALLBACK_DATA  *Private;
  EFI_STRING                       ConfigRequestHdr;
  EFI_STRING                       ConfigRequest;
  BOOLEAN                          AllocatedRequest;
  UINTN                            Size;

  if (Progress == NULL || Results == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  *Progress = Request;
  if ((Request != NULL) && !HiiIsConfigHdrMatch (Request, &mBootMaintGuid, mBootMaintStorageName)) {
    return EFI_NOT_FOUND;
  }

  ConfigRequestHdr = NULL;
  ConfigRequest    = NULL;
  AllocatedRequest = FALSE;
  Size             = 0;

  Private = BMM_CALLBACK_DATA_FROM_THIS (This);
  //
  // Convert buffer data to <ConfigResp> by helper function BlockToConfig()
  //
  BufferSize = sizeof (BMM_FAKE_NV_DATA);
  ConfigRequest = Request;
  if ((Request == NULL) || (StrStr (Request, L"OFFSET") == NULL)) {
    //
    // Request has no request element, construct full request string.
    // Allocate and fill a buffer large enough to hold the <ConfigHdr> template
    // followed by "&OFFSET=0&WIDTH=WWWWWWWWWWWWWWWW" followed by a Null-terminator
    //
    ConfigRequestHdr = HiiConstructConfigHdr (&mBootMaintGuid, mBootMaintStorageName, Private->BmmDriverHandle);
    Size = (StrLen (ConfigRequestHdr) + 32 + 1) * sizeof (CHAR16);
    ConfigRequest = AllocateZeroPool (Size);
    ASSERT (ConfigRequest != NULL);
    AllocatedRequest = TRUE;
    UnicodeSPrint (ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, (UINT64)BufferSize);
    FreePool (ConfigRequestHdr);
  }

  Status = gHiiConfigRouting->BlockToConfig (
                                gHiiConfigRouting,
                                ConfigRequest,
                                (UINT8 *) &Private->BmmFakeNvData,
                                BufferSize,
                                Results,
                                Progress
                                );
  //
  // Free the allocated config request string.
  //
  if (AllocatedRequest) {
    FreePool (ConfigRequest);
    ConfigRequest = NULL;
  }
  //
  // Set Progress string to the original request string.
  //
  if (Request == NULL) {
    *Progress = NULL;
  } else if (StrStr (Request, L"OFFSET") == NULL) {
    *Progress = Request + StrLen (Request);
  }

  return Status;
}

/**
  This function processes the results of changes in configuration.


  @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_OUT_OF_RESOURCES  Not enough storage is available to hold the variable and its data.
  @retval EFI_DEVICE_ERROR      The variable could not be saved.
  @retval EFI_UNSUPPORTED       The specified Action is not supported by the callback.
  @retval EFI_INVALID_PARAMETER The parameter of Value or ActionRequest is invalid.
**/
EFI_STATUS
EFIAPI
BootMaintCallback (
  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
  )
{
  BMM_CALLBACK_DATA *Private;
  BM_MENU_ENTRY     *NewMenuEntry;
  BMM_FAKE_NV_DATA  *CurrentFakeNVMap;
  EFI_STATUS        Status;
  UINTN             OldValue;
  UINTN             NewValue;
  UINTN             Number;
  UINTN             Pos;
  UINTN             Bit;
  UINT16            NewValuePos;
  UINT16            Index2;
  UINT16            Index;
  UINT8             *OldLegacyDev;
  UINT8             *NewLegacyDev;
  UINT8             *DisMap;
  EFI_FORM_ID       FormId;
  
  if ((Action == EFI_BROWSER_ACTION_FORM_OPEN) || (Action == EFI_BROWSER_ACTION_FORM_CLOSE)) {
    //
    // Do nothing for UEFI OPEN/CLOSE Action
    //
    return EFI_SUCCESS;
  }

  if ((Value == NULL) || (ActionRequest == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  OldValue       = 0;
  NewValue       = 0;
  Number         = 0;
  OldLegacyDev   = NULL;
  NewLegacyDev   = NULL;
  NewValuePos    = 0;
  DisMap         = NULL;
  *ActionRequest = EFI_BROWSER_ACTION_REQUEST_NONE;

  Private        = BMM_CALLBACK_DATA_FROM_THIS (This);
  UpdatePageId (Private, QuestionId);

  //
  // Retrive uncommitted data from Form Browser
  //
  CurrentFakeNVMap = &Private->BmmFakeNvData;
  HiiGetBrowserData (&mBootMaintGuid, mBootMaintStorageName, sizeof (BMM_FAKE_NV_DATA), (UINT8 *) CurrentFakeNVMap);

  //
  // need to be subtituded.
  //
  // Update Select FD/HD/CD/NET/BEV Order Form
  //
  if (FORM_SET_FD_ORDER_ID == Private->BmmPreviousPageId ||
      FORM_SET_HD_ORDER_ID == Private->BmmPreviousPageId ||
      FORM_SET_CD_ORDER_ID == Private->BmmPreviousPageId ||
      FORM_SET_NET_ORDER_ID == Private->BmmPreviousPageId ||
      FORM_SET_BEV_ORDER_ID == Private->BmmPreviousPageId ||
      ((FORM_BOOT_SETUP_ID == Private->BmmPreviousPageId) &&
      (QuestionId >= LEGACY_FD_QUESTION_ID) &&
       (QuestionId < (LEGACY_BEV_QUESTION_ID + 100)) )
      ) {

    DisMap  = Private->BmmOldFakeNVData.DisableMap;

    FormId  = Private->BmmPreviousPageId;
    if (FormId == FORM_BOOT_SETUP_ID) {
      FormId = Private->BmmCurrentPageId;
    }

    switch (FormId) {
    case FORM_SET_FD_ORDER_ID:
      Number        = (UINT16) LegacyFDMenu.MenuNumber;
      OldLegacyDev  = Private->BmmOldFakeNVData.LegacyFD;
      NewLegacyDev  = CurrentFakeNVMap->LegacyFD;
      break;

    case FORM_SET_HD_ORDER_ID:
      Number        = (UINT16) LegacyHDMenu.MenuNumber;
      OldLegacyDev  = Private->BmmOldFakeNVData.LegacyHD;
      NewLegacyDev  = CurrentFakeNVMap->LegacyHD;
      break;

    case FORM_SET_CD_ORDER_ID:
      Number        = (UINT16) LegacyCDMenu.MenuNumber;
      OldLegacyDev  = Private->BmmOldFakeNVData.LegacyCD;
      NewLegacyDev  = CurrentFakeNVMap->LegacyCD;
      break;

    case FORM_SET_NET_ORDER_ID:
      Number        = (UINT16) LegacyNETMenu.MenuNumber;
      OldLegacyDev  = Private->BmmOldFakeNVData.LegacyNET;
      NewLegacyDev  = CurrentFakeNVMap->LegacyNET;
      break;

    case FORM_SET_BEV_ORDER_ID:
      Number        = (UINT16) LegacyBEVMenu.MenuNumber;
      OldLegacyDev  = Private->BmmOldFakeNVData.LegacyBEV;
      NewLegacyDev  = CurrentFakeNVMap->LegacyBEV;
      break;

    default:
      break;
    }
    //
    //  First, find the different position
    //  if there is change, it should be only one
    //
    for (Index = 0; Index < Number; Index++) {
      if (OldLegacyDev[Index] != NewLegacyDev[Index]) {
        OldValue  = OldLegacyDev[Index];
        NewValue  = NewLegacyDev[Index];
        break;
      }
    }

    if (Index != Number) {
      //
      // there is change, now process
      //
      if (0xFF == NewValue) {
        //
        // This item will be disable
        // Just move the items behind this forward to overlap it
        //
        Pos = OldValue / 8;
        Bit = 7 - (OldValue % 8);
        DisMap[Pos] = (UINT8) (DisMap[Pos] | (UINT8) (1 << Bit));
        for (Index2 = Index; Index2 < Number - 1; Index2++) {
          NewLegacyDev[Index2] = NewLegacyDev[Index2 + 1];
        }

        NewLegacyDev[Index2] = 0xFF;
      } else {
        for (Index2 = 0; Index2 < Number; Index2++) {
          if (Index2 == Index) {
            continue;
          }

          if (OldLegacyDev[Index2] == NewValue) {
            //
            // If NewValue is in OldLegacyDev array
            // remember its old position
            //
            NewValuePos = Index2;
            break;
          }
        }

        if (Index2 != Number) {
          //
          // We will change current item to an existing item
          // (It's hard to describe here, please read code, it's like a cycle-moving)
          //
          for (Index2 = NewValuePos; Index2 != Index;) {
            if (NewValuePos < Index) {
              NewLegacyDev[Index2] = OldLegacyDev[Index2 + 1];
              Index2++;
            } else {
              NewLegacyDev[Index2] = OldLegacyDev[Index2 - 1];
              Index2--;
            }
          }
        } else {
          //
          // If NewValue is not in OldlegacyDev array, we are changing to a disabled item
          // so we should modify DisMap to reflect the change
          //
          Pos = NewValue / 8;
          Bit = 7 - (NewValue % 8);
          DisMap[Pos] = (UINT8) (DisMap[Pos] & (~ (UINT8) (1 << Bit)));
          if (0xFF != OldValue) {
            //
            // Because NewValue is a item that was disabled before
            // so after changing the OldValue should be disabled
            // actually we are doing a swap of enable-disable states of two items
            //
            Pos = OldValue / 8;
            Bit = 7 - (OldValue % 8);
            DisMap[Pos] = (UINT8) (DisMap[Pos] | (UINT8) (1 << Bit));
          }
        }
      }
      //
      // To prevent DISABLE appears in the middle of the list
      // we should perform a re-ordering
      //
      Index = 0;
      while (Index < Number) {
        if (0xFF != NewLegacyDev[Index]) {
          Index++;
          continue;
        }

        Index2 = Index;
        Index2++;
        while (Index2 < Number) {
          if (0xFF != NewLegacyDev[Index2]) {
            break;
          }

          Index2++;
        }

        if (Index2 < Number) {
          NewLegacyDev[Index]   = NewLegacyDev[Index2];
          NewLegacyDev[Index2]  = 0xFF;
        }

        Index++;
      }

      CopyMem (
        OldLegacyDev,
        NewLegacyDev,
        Number
        );
    }
  }

  if (QuestionId < FILE_OPTION_OFFSET) {
    if (QuestionId < CONFIG_OPTION_OFFSET) {
      switch (QuestionId) {
      case KEY_VALUE_BOOT_FROM_FILE:
        Private->FeCurrentState = FileExplorerStateBootFromFile;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
        break;

      case FORM_BOOT_ADD_ID:
        Private->FeCurrentState = FileExplorerStateAddBootOption;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
        break;

      case FORM_DRV_ADD_FILE_ID:
        Private->FeCurrentState = FileExplorerStateAddDriverOptionState;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
        break;

      case FORM_DRV_ADD_HANDLE_ID:
        CleanUpPage (FORM_DRV_ADD_HANDLE_ID, Private);
        UpdateDrvAddHandlePage (Private);
        break;

      case FORM_BOOT_DEL_ID:
        CleanUpPage (FORM_BOOT_DEL_ID, Private);
        UpdateBootDelPage (Private);
        break;

      case FORM_BOOT_CHG_ID:
      case FORM_DRV_CHG_ID:
        UpdatePageBody (QuestionId, Private);
        break;

      case FORM_DRV_DEL_ID:
        CleanUpPage (FORM_DRV_DEL_ID, Private);
        UpdateDrvDelPage (Private);
        break;

      case FORM_BOOT_NEXT_ID:
        CleanUpPage (FORM_BOOT_NEXT_ID, Private);
        UpdateBootNextPage (Private);
        break;

      case FORM_TIME_OUT_ID:
        CleanUpPage (FORM_TIME_OUT_ID, Private);
        UpdateTimeOutPage (Private);
        break;

      case FORM_RESET:
        gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
        return EFI_UNSUPPORTED;

      case FORM_CON_IN_ID:
      case FORM_CON_OUT_ID:
      case FORM_CON_ERR_ID:
        UpdatePageBody (QuestionId, Private);
        break;

      case FORM_CON_MODE_ID:
        CleanUpPage (FORM_CON_MODE_ID, Private);
        UpdateConModePage (Private);
        break;

      case FORM_CON_COM_ID:
        CleanUpPage (FORM_CON_COM_ID, Private);
        UpdateConCOMPage (Private);
        break;

      case FORM_SET_FD_ORDER_ID:
      case FORM_SET_HD_ORDER_ID:
      case FORM_SET_CD_ORDER_ID:
      case FORM_SET_NET_ORDER_ID:
      case FORM_SET_BEV_ORDER_ID:
        CleanUpPage (QuestionId, Private);
        UpdateSetLegacyDeviceOrderPage (QuestionId, Private);
        break;

      case KEY_VALUE_SAVE_AND_EXIT:
      case KEY_VALUE_NO_SAVE_AND_EXIT:

        if (QuestionId == KEY_VALUE_SAVE_AND_EXIT) {
          Status = ApplyChangeHandler (Private, CurrentFakeNVMap, Private->BmmPreviousPageId);
          if (EFI_ERROR (Status)) {
            return Status;
          }
        } else if (QuestionId == KEY_VALUE_NO_SAVE_AND_EXIT) {
          DiscardChangeHandler (Private, CurrentFakeNVMap);
        }

        //
        // Tell browser not to ask for confirmation of changes,
        // since we have already applied or discarded.
        //
        *ActionRequest = EFI_BROWSER_ACTION_REQUEST_SUBMIT;
        break;

      default:
        break;
      }
    } else if ((QuestionId >= TERMINAL_OPTION_OFFSET) && (QuestionId < CONSOLE_OPTION_OFFSET)) {
      Index2                    = (UINT16) (QuestionId - TERMINAL_OPTION_OFFSET);
      Private->CurrentTerminal  = Index2;

      CleanUpPage (FORM_CON_COM_SETUP_ID, Private);
      UpdateTerminalPage (Private);

    } else if (QuestionId >= HANDLE_OPTION_OFFSET) {
      Index2                  = (UINT16) (QuestionId - HANDLE_OPTION_OFFSET);

      NewMenuEntry            = BOpt_GetMenuEntry (&DriverMenu, Index2);
      ASSERT (NewMenuEntry != NULL);
      Private->HandleContext  = (BM_HANDLE_CONTEXT *) NewMenuEntry->VariableContext;

      CleanUpPage (FORM_DRV_ADD_HANDLE_DESC_ID, Private);

      Private->MenuEntry                  = NewMenuEntry;
      Private->LoadContext->FilePathList  = Private->HandleContext->DevicePath;

      UpdateDriverAddHandleDescPage (Private);
    }
  }

  //
  // Pass changed uncommitted data back to Form Browser
  //
  Status = HiiSetBrowserData (&mBootMaintGuid, mBootMaintStorageName, sizeof (BMM_FAKE_NV_DATA), (UINT8 *) CurrentFakeNVMap, NULL);

  return Status;
}

/**
  Function handling request to apply changes for BMM pages.

  @param Private            Pointer to callback data buffer.
  @param CurrentFakeNVMap   Pointer to buffer holding data of various values used by BMM
  @param FormId             ID of the form which has sent the request to apply change.

  @retval  EFI_SUCCESS       Change successfully applied.
  @retval  Other             Error occurs while trying to apply changes.

**/
EFI_STATUS
ApplyChangeHandler (
  IN  BMM_CALLBACK_DATA               *Private,
  IN  BMM_FAKE_NV_DATA                *CurrentFakeNVMap,
  IN  EFI_FORM_ID                     FormId
  )
{
  BM_CONSOLE_CONTEXT  *NewConsoleContext;
  BM_TERMINAL_CONTEXT *NewTerminalContext;
  BM_LOAD_CONTEXT     *NewLoadContext;
  BM_MENU_ENTRY       *NewMenuEntry;
  EFI_STATUS          Status;
  UINT16              Index;

  Status = EFI_SUCCESS;

  switch (FormId) {
  case FORM_SET_FD_ORDER_ID:
  case FORM_SET_HD_ORDER_ID:
  case FORM_SET_CD_ORDER_ID:
  case FORM_SET_NET_ORDER_ID:
  case FORM_SET_BEV_ORDER_ID:
    Var_UpdateBBSOption (Private);
    break;

  case FORM_BOOT_DEL_ID:
    for (Index = 0; 
         ((Index < BootOptionMenu.MenuNumber) && (Index < (sizeof (CurrentFakeNVMap->OptionDel) / sizeof (CurrentFakeNVMap->OptionDel[0])))); 
         Index ++) {
      NewMenuEntry            = BOpt_GetMenuEntry (&BootOptionMenu, Index);
      NewLoadContext          = (BM_LOAD_CONTEXT *) NewMenuEntry->VariableContext;
      NewLoadContext->Deleted = CurrentFakeNVMap->OptionDel[Index];
    }

    Var_DelBootOption ();
    break;

  case FORM_DRV_DEL_ID:
    for (Index = 0; 
         ((Index < DriverOptionMenu.MenuNumber) && (Index < (sizeof (CurrentFakeNVMap->OptionDel) / sizeof (CurrentFakeNVMap->OptionDel[0])))); 
         Index++) {
      NewMenuEntry            = BOpt_GetMenuEntry (&DriverOptionMenu, Index);
      NewLoadContext          = (BM_LOAD_CONTEXT *) NewMenuEntry->VariableContext;
      NewLoadContext->Deleted = CurrentFakeNVMap->OptionDel[Index];
    }

    Var_DelDriverOption ();
    break;

  case FORM_BOOT_CHG_ID:
    Status = Var_UpdateBootOrder (Private);
    break;

  case FORM_DRV_CHG_ID:
    Status = Var_UpdateDriverOrder (Private);
    break;

  case FORM_TIME_OUT_ID:
    PcdSet16 (PcdPlatformBootTimeOut, CurrentFakeNVMap->BootTimeOut);

    Private->BmmOldFakeNVData.BootTimeOut = CurrentFakeNVMap->BootTimeOut;
    break;

  case FORM_BOOT_NEXT_ID:
    Status = Var_UpdateBootNext (Private);
    break;

  case FORM_CON_MODE_ID:
    Status = Var_UpdateConMode (Private);
    break;

  case FORM_CON_COM_SETUP_ID:
    NewMenuEntry                      = BOpt_GetMenuEntry (&TerminalMenu, Private->CurrentTerminal);

    ASSERT (NewMenuEntry != NULL);

    NewTerminalContext                = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;

    NewTerminalContext->BaudRateIndex = CurrentFakeNVMap->COMBaudRate;
    ASSERT (CurrentFakeNVMap->COMBaudRate < (sizeof (BaudRateList) / sizeof (BaudRateList[0])));
    NewTerminalContext->BaudRate      = BaudRateList[CurrentFakeNVMap->COMBaudRate].Value;
    NewTerminalContext->DataBitsIndex = CurrentFakeNVMap->COMDataRate;
    ASSERT (CurrentFakeNVMap->COMDataRate < (sizeof (DataBitsList) / sizeof (DataBitsList[0])));
    NewTerminalContext->DataBits      = (UINT8) DataBitsList[CurrentFakeNVMap->COMDataRate].Value;
    NewTerminalContext->StopBitsIndex = CurrentFakeNVMap->COMStopBits;
    ASSERT (CurrentFakeNVMap->COMStopBits < (sizeof (StopBitsList) / sizeof (StopBitsList[0])));
    NewTerminalContext->StopBits      = (UINT8) StopBitsList[CurrentFakeNVMap->COMStopBits].Value;
    NewTerminalContext->ParityIndex   = CurrentFakeNVMap->COMParity;
    ASSERT (CurrentFakeNVMap->COMParity < (sizeof (ParityList) / sizeof (ParityList[0])));
    NewTerminalContext->Parity        = (UINT8) ParityList[CurrentFakeNVMap->COMParity].Value;
    NewTerminalContext->TerminalType  = CurrentFakeNVMap->COMTerminalType;
    NewTerminalContext->FlowControl   = CurrentFakeNVMap->COMFlowControl;

    ChangeTerminalDevicePath (
      &(NewTerminalContext->DevicePath),
      FALSE
      );

    Var_UpdateConsoleInpOption ();
    Var_UpdateConsoleOutOption ();
    Var_UpdateErrorOutOption ();
    break;

  case FORM_CON_IN_ID:
    for (Index = 0; Index < ConsoleInpMenu.MenuNumber; Index++) {
      NewMenuEntry                = BOpt_GetMenuEntry (&ConsoleInpMenu, Index);
      NewConsoleContext           = (BM_CONSOLE_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index < MAX_MENU_NUMBER);
      NewConsoleContext->IsActive = CurrentFakeNVMap->ConsoleCheck[Index];
    }

    for (Index = 0; Index < TerminalMenu.MenuNumber; Index++) {
      NewMenuEntry                = BOpt_GetMenuEntry (&TerminalMenu, Index);
      NewTerminalContext          = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index + ConsoleInpMenu.MenuNumber < MAX_MENU_NUMBER);
      NewTerminalContext->IsConIn = CurrentFakeNVMap->ConsoleCheck[Index + ConsoleInpMenu.MenuNumber];
    }

    Var_UpdateConsoleInpOption ();
    break;

  case FORM_CON_OUT_ID:
    for (Index = 0; Index < ConsoleOutMenu.MenuNumber; Index++) {
      NewMenuEntry                = BOpt_GetMenuEntry (&ConsoleOutMenu, Index);
      NewConsoleContext           = (BM_CONSOLE_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index < MAX_MENU_NUMBER);
      NewConsoleContext->IsActive = CurrentFakeNVMap->ConsoleCheck[Index];
    }

    for (Index = 0; Index < TerminalMenu.MenuNumber; Index++) {
      NewMenuEntry                  = BOpt_GetMenuEntry (&TerminalMenu, Index);
      NewTerminalContext            = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index + ConsoleOutMenu.MenuNumber < MAX_MENU_NUMBER);
      NewTerminalContext->IsConOut  = CurrentFakeNVMap->ConsoleCheck[Index + ConsoleOutMenu.MenuNumber];
    }

    Var_UpdateConsoleOutOption ();
    break;

  case FORM_CON_ERR_ID:
    for (Index = 0; Index < ConsoleErrMenu.MenuNumber; Index++) {
      NewMenuEntry                = BOpt_GetMenuEntry (&ConsoleErrMenu, Index);
      NewConsoleContext           = (BM_CONSOLE_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index < MAX_MENU_NUMBER);
      NewConsoleContext->IsActive = CurrentFakeNVMap->ConsoleCheck[Index];
    }

    for (Index = 0; Index < TerminalMenu.MenuNumber; Index++) {
      NewMenuEntry                  = BOpt_GetMenuEntry (&TerminalMenu, Index);
      NewTerminalContext            = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;
      ASSERT (Index + ConsoleErrMenu.MenuNumber < MAX_MENU_NUMBER);
      NewTerminalContext->IsStdErr  = CurrentFakeNVMap->ConsoleCheck[Index + ConsoleErrMenu.MenuNumber];
    }

    Var_UpdateErrorOutOption ();
    break;

  case FORM_DRV_ADD_HANDLE_DESC_ID:
    Status = Var_UpdateDriverOption (
               Private,
               Private->BmmHiiHandle,
               CurrentFakeNVMap->DriverAddHandleDesc,
               CurrentFakeNVMap->DriverAddHandleOptionalData,
               CurrentFakeNVMap->DriverAddForceReconnect
               );
    if (EFI_ERROR (Status)) {
      goto Error;
    }

    BOpt_GetDriverOptions (Private);
    CreateMenuStringToken (Private, Private->BmmHiiHandle, &DriverOptionMenu);
    break;

  default:
    break;
  }

Error:
  return Status;
}

/**
  Discard all changes done to the BMM pages such as Boot Order change,
  Driver order change.

  @param Private            The BMM context data.
  @param CurrentFakeNVMap   The current Fack NV Map.

**/
VOID
DiscardChangeHandler (
  IN  BMM_CALLBACK_DATA               *Private,
  IN  BMM_FAKE_NV_DATA                *CurrentFakeNVMap
  )
{
  UINT16  Index;

  switch (Private->BmmPreviousPageId) {
  case FORM_BOOT_CHG_ID:
  case FORM_DRV_CHG_ID:
    CopyMem (CurrentFakeNVMap->OptionOrder, Private->BmmOldFakeNVData.OptionOrder, sizeof (CurrentFakeNVMap->OptionOrder));
    break;

  case FORM_BOOT_DEL_ID:
    ASSERT (BootOptionMenu.MenuNumber <= (sizeof (CurrentFakeNVMap->OptionDel) / sizeof (CurrentFakeNVMap->OptionDel[0])));
    for (Index = 0; Index < BootOptionMenu.MenuNumber; Index++) {
      CurrentFakeNVMap->OptionDel[Index] = FALSE;
    }
    break;

  case FORM_DRV_DEL_ID:
    ASSERT (DriverOptionMenu.MenuNumber <= (sizeof (CurrentFakeNVMap->OptionDel) / sizeof (CurrentFakeNVMap->OptionDel[0])));
    for (Index = 0; Index < DriverOptionMenu.MenuNumber; Index++) {
      CurrentFakeNVMap->OptionDel[Index] = FALSE;
    }
    break;

  case FORM_BOOT_NEXT_ID:
    CurrentFakeNVMap->BootNext = Private->BmmOldFakeNVData.BootNext;
    break;

  case FORM_TIME_OUT_ID:
    CurrentFakeNVMap->BootTimeOut = Private->BmmOldFakeNVData.BootTimeOut;
    break;

  case FORM_DRV_ADD_HANDLE_DESC_ID:
  case FORM_DRV_ADD_FILE_ID:
  case FORM_DRV_ADD_HANDLE_ID:
    CurrentFakeNVMap->DriverAddHandleDesc[0]          = 0x0000;
    CurrentFakeNVMap->DriverAddHandleOptionalData[0]  = 0x0000;
    break;

  default:
    break;
  }
}

/**
  Initialize the Boot Maintenance Utitliy.


  @retval  EFI_SUCCESS      utility ended successfully
  @retval  others           contain some errors

**/
EFI_STATUS
InitializeBM (
  VOID
  )
{
  EFI_LEGACY_BIOS_PROTOCOL    *LegacyBios;
  BMM_CALLBACK_DATA           *BmmCallbackInfo;
  EFI_STATUS                  Status;
  UINT8                       *Ptr;

  Status = EFI_SUCCESS;

  //
  // Create CallbackData structures for Driver Callback
  //
  BmmCallbackInfo = AllocateZeroPool (sizeof (BMM_CALLBACK_DATA));
  if (BmmCallbackInfo == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Create LoadOption in BmmCallbackInfo for Driver Callback
  //
  Ptr = AllocateZeroPool (sizeof (BM_LOAD_CONTEXT) + sizeof (BM_FILE_CONTEXT) + sizeof (BM_HANDLE_CONTEXT) + sizeof (BM_MENU_ENTRY));
  if (Ptr == NULL) {
    FreePool (BmmCallbackInfo);
    return EFI_OUT_OF_RESOURCES;
  }

  //
  // Initialize Bmm callback data.
  //
  BmmCallbackInfo->LoadContext = (BM_LOAD_CONTEXT *) Ptr;
  Ptr += sizeof (BM_LOAD_CONTEXT);

  BmmCallbackInfo->FileContext = (BM_FILE_CONTEXT *) Ptr;
  Ptr += sizeof (BM_FILE_CONTEXT);

  BmmCallbackInfo->HandleContext = (BM_HANDLE_CONTEXT *) Ptr;
  Ptr += sizeof (BM_HANDLE_CONTEXT);

  BmmCallbackInfo->MenuEntry      = (BM_MENU_ENTRY *) Ptr;

  BmmCallbackInfo->Signature                     = BMM_CALLBACK_DATA_SIGNATURE;
  BmmCallbackInfo->BmmConfigAccess.ExtractConfig = BootMaintExtractConfig;
  BmmCallbackInfo->BmmConfigAccess.RouteConfig   = FakeRouteConfig;
  BmmCallbackInfo->BmmConfigAccess.Callback      = BootMaintCallback;
  BmmCallbackInfo->BmmPreviousPageId             = FORM_MAIN_ID;
  BmmCallbackInfo->BmmCurrentPageId              = FORM_MAIN_ID;
  BmmCallbackInfo->FeConfigAccess.ExtractConfig  = FakeExtractConfig;
  BmmCallbackInfo->FeConfigAccess.RouteConfig    = FakeRouteConfig;
  BmmCallbackInfo->FeConfigAccess.Callback       = FileExplorerCallback;
  BmmCallbackInfo->FeCurrentState                = FileExplorerStateInActive;
  BmmCallbackInfo->FeDisplayContext              = FileExplorerDisplayUnknown;

  //
  // Install Device Path Protocol and Config Access protocol to driver handle
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &BmmCallbackInfo->BmmDriverHandle,
                  &gEfiDevicePathProtocolGuid,
                  &mBmmHiiVendorDevicePath,
                  &gEfiHiiConfigAccessProtocolGuid,
                  &BmmCallbackInfo->BmmConfigAccess,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    goto Exit;
  }

  //
  // Install Device Path Protocol and Config Access protocol to driver handle
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &BmmCallbackInfo->FeDriverHandle,
                  &gEfiDevicePathProtocolGuid,
                  &mFeHiiVendorDevicePath,
                  &gEfiHiiConfigAccessProtocolGuid,
                  &BmmCallbackInfo->FeConfigAccess,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    goto Exit;
  }

  //
  // Post our Boot Maint VFR binary to the HII database.
  //
  BmmCallbackInfo->BmmHiiHandle = HiiAddPackages (
                                    &mBootMaintGuid,
                                    BmmCallbackInfo->BmmDriverHandle,
                                    BmBin,
                                    BdsDxeStrings,
                                    NULL
                                    );
  ASSERT (BmmCallbackInfo->BmmHiiHandle != NULL);

  //
  // Post our File Explorer VFR binary to the HII database.
  //
  BmmCallbackInfo->FeHiiHandle = HiiAddPackages (
                                   &mFileExplorerGuid,
                                   BmmCallbackInfo->FeDriverHandle,
                                   FEBin,
                                   BdsDxeStrings,
                                   NULL
                                   );
  ASSERT (BmmCallbackInfo->FeHiiHandle != NULL);

  //
  // Init OpCode Handle and Allocate space for creation of Buffer
  //
  mStartOpCodeHandle = HiiAllocateOpCodeHandle ();
  if (mStartOpCodeHandle == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Exit;
  }

  mEndOpCodeHandle = HiiAllocateOpCodeHandle ();
  if (mEndOpCodeHandle == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto Exit;
  }

  //
  // Create Hii Extend Label OpCode as the start opcode
  //
  mStartLabel = (EFI_IFR_GUID_LABEL *) HiiCreateGuidOpCode (mStartOpCodeHandle, &gEfiIfrTianoGuid, NULL, sizeof (EFI_IFR_GUID_LABEL));
  mStartLabel->ExtendOpCode = EFI_IFR_EXTEND_OP_LABEL;

  //
  // Create Hii Extend Label OpCode as the end opcode
  //
  mEndLabel = (EFI_IFR_GUID_LABEL *) HiiCreateGuidOpCode (mEndOpCodeHandle, &gEfiIfrTianoGuid, NULL, sizeof (EFI_IFR_GUID_LABEL));
  mEndLabel->ExtendOpCode = EFI_IFR_EXTEND_OP_LABEL;
  mEndLabel->Number       = LABEL_END;

  InitializeStringDepository ();

  InitAllMenu (BmmCallbackInfo);

  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &ConsoleInpMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &ConsoleOutMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &ConsoleErrMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &BootOptionMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &DriverOptionMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &TerminalMenu);
  CreateMenuStringToken (BmmCallbackInfo, BmmCallbackInfo->BmmHiiHandle, &DriverMenu);

  UpdateBootDelPage (BmmCallbackInfo);
  UpdateDrvDelPage (BmmCallbackInfo);

  if (TerminalMenu.MenuNumber > 0) {
    BmmCallbackInfo->CurrentTerminal = 0;
    UpdateTerminalPage (BmmCallbackInfo);
  }

  Status = EfiLibLocateProtocol (&gEfiLegacyBiosProtocolGuid, (VOID **) &LegacyBios);
  if (!EFI_ERROR (Status)) {
    RefreshUpdateData ();
    mStartLabel->Number = FORM_BOOT_LEGACY_DEVICE_ID;

    //
    // If LegacyBios Protocol is installed, add 3 tags about legacy boot option
    // in BootOption form: legacy FD/HD/CD/NET/BEV
    //
    HiiCreateGotoOpCode (
      mStartOpCodeHandle,
      FORM_SET_FD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_FD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_FD_ORDER_TITLE),
      EFI_IFR_FLAG_CALLBACK,
      FORM_SET_FD_ORDER_ID
      );

    HiiCreateGotoOpCode (
      mStartOpCodeHandle,
      FORM_SET_HD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_HD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_HD_ORDER_TITLE),
      EFI_IFR_FLAG_CALLBACK,
      FORM_SET_HD_ORDER_ID
      );

    HiiCreateGotoOpCode (
      mStartOpCodeHandle,
      FORM_SET_CD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_CD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_CD_ORDER_TITLE),
      EFI_IFR_FLAG_CALLBACK,
      FORM_SET_CD_ORDER_ID
      );

    HiiCreateGotoOpCode (
      mStartOpCodeHandle,
      FORM_SET_NET_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_NET_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_NET_ORDER_TITLE),
      EFI_IFR_FLAG_CALLBACK,
      FORM_SET_NET_ORDER_ID
      );

    HiiCreateGotoOpCode (
      mStartOpCodeHandle,
      FORM_SET_BEV_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_BEV_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_BEV_ORDER_TITLE),
      EFI_IFR_FLAG_CALLBACK,
      FORM_SET_BEV_ORDER_ID
      );
    
    HiiUpdateForm (
      BmmCallbackInfo->BmmHiiHandle,
      &mBootMaintGuid,
      FORM_BOOT_SETUP_ID,
      mStartOpCodeHandle, // Label FORM_BOOT_LEGACY_DEVICE_ID
      mEndOpCodeHandle    // LABEL_END
      );
  }

  //
  // Dispatch BMM main formset and File Explorer formset.
  //
  FormSetDispatcher (BmmCallbackInfo);

  //
  // Remove our IFR data from HII database
  //
  HiiRemovePackages (BmmCallbackInfo->BmmHiiHandle);
  HiiRemovePackages (BmmCallbackInfo->FeHiiHandle);

  CleanUpStringDepository ();

  FreeAllMenu ();

Exit:
  if (mStartOpCodeHandle != NULL) {
    HiiFreeOpCodeHandle (mStartOpCodeHandle);
  }

  if (mEndOpCodeHandle != NULL) {
    HiiFreeOpCodeHandle (mEndOpCodeHandle);
  }

  if (BmmCallbackInfo->FeDriverHandle != NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           BmmCallbackInfo->FeDriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mFeHiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           &BmmCallbackInfo->FeConfigAccess,
           NULL
           );
  }

  if (BmmCallbackInfo->BmmDriverHandle != NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           BmmCallbackInfo->BmmDriverHandle,
           &gEfiDevicePathProtocolGuid,
           &mBmmHiiVendorDevicePath,
           &gEfiHiiConfigAccessProtocolGuid,
           &BmmCallbackInfo->BmmConfigAccess,
           NULL
           );
  }

  FreePool (BmmCallbackInfo->LoadContext);
  FreePool (BmmCallbackInfo);

  return Status;
}

/**
  Initialized all Menu Option List.

  @param CallbackData    The BMM context data.

**/
VOID
InitAllMenu (
  IN  BMM_CALLBACK_DATA    *CallbackData
  )
{
  InitializeListHead (&BootOptionMenu.Head);
  InitializeListHead (&DriverOptionMenu.Head);
  BOpt_GetBootOptions (CallbackData);
  BOpt_GetDriverOptions (CallbackData);
  BOpt_GetLegacyOptions ();
  InitializeListHead (&FsOptionMenu.Head);
  BOpt_FindDrivers ();
  InitializeListHead (&DirectoryMenu.Head);
  InitializeListHead (&ConsoleInpMenu.Head);
  InitializeListHead (&ConsoleOutMenu.Head);
  InitializeListHead (&ConsoleErrMenu.Head);
  InitializeListHead (&TerminalMenu.Head);
  LocateSerialIo ();
  GetAllConsoles ();
}

/**
  Free up all Menu Option list.

**/
VOID
FreeAllMenu (
  VOID
  )
{
  BOpt_FreeMenu (&DirectoryMenu);
  BOpt_FreeMenu (&FsOptionMenu);
  BOpt_FreeMenu (&BootOptionMenu);
  BOpt_FreeMenu (&DriverOptionMenu);
  BOpt_FreeMenu (&DriverMenu);
  BOpt_FreeLegacyOptions ();
  FreeAllConsoles ();
}

/**
  Initialize all the string depositories.

**/
VOID
InitializeStringDepository (
  VOID
  )
{
  STRING_DEPOSITORY *StringDepository;
  StringDepository              = AllocateZeroPool (sizeof (STRING_DEPOSITORY) * STRING_DEPOSITORY_NUMBER);
  FileOptionStrDepository       = StringDepository++;
  ConsoleOptionStrDepository    = StringDepository++;
  BootOptionStrDepository       = StringDepository++;
  BootOptionHelpStrDepository   = StringDepository++;
  DriverOptionStrDepository     = StringDepository++;
  DriverOptionHelpStrDepository = StringDepository++;
  TerminalStrDepository         = StringDepository;
}

/**
  Fetch a usable string node from the string depository and return the string token.

  @param CallbackData       The BMM context data.
  @param StringDepository   The string repository.

  @retval  EFI_STRING_ID           String token.

**/
EFI_STRING_ID
GetStringTokenFromDepository (
  IN   BMM_CALLBACK_DATA     *CallbackData,
  IN   STRING_DEPOSITORY     *StringDepository
  )
{
  STRING_LIST_NODE  *CurrentListNode;
  STRING_LIST_NODE  *NextListNode;

  CurrentListNode = StringDepository->CurrentNode;

  if ((NULL != CurrentListNode) && (NULL != CurrentListNode->Next)) {
    //
    // Fetch one reclaimed node from the list.
    //
    NextListNode = StringDepository->CurrentNode->Next;
  } else {
    //
    // If there is no usable node in the list, update the list.
    //
    NextListNode = AllocateZeroPool (sizeof (STRING_LIST_NODE));
    ASSERT (NextListNode != NULL);
    NextListNode->StringToken = HiiSetString (CallbackData->BmmHiiHandle, 0, L" ", NULL);
    ASSERT (NextListNode->StringToken != 0);

    StringDepository->TotalNodeNumber++;

    if (NULL == CurrentListNode) {
      StringDepository->ListHead = NextListNode;
    } else {
      CurrentListNode->Next = NextListNode;
    }
  }

  StringDepository->CurrentNode = NextListNode;

  return StringDepository->CurrentNode->StringToken;
}

/**
  Reclaim string depositories by moving the current node pointer to list head..

**/
VOID
ReclaimStringDepository (
  VOID
  )
{
  UINTN             DepositoryIndex;
  STRING_DEPOSITORY *StringDepository;

  StringDepository = FileOptionStrDepository;
  for (DepositoryIndex = 0; DepositoryIndex < STRING_DEPOSITORY_NUMBER; DepositoryIndex++) {
    StringDepository->CurrentNode = StringDepository->ListHead;
    StringDepository++;
  }
}

/**
  Release resource for all the string depositories.

**/
VOID
CleanUpStringDepository (
  VOID
  )
{
  UINTN             NodeIndex;
  UINTN             DepositoryIndex;
  STRING_LIST_NODE  *CurrentListNode;
  STRING_LIST_NODE  *NextListNode;
  STRING_DEPOSITORY *StringDepository;

  //
  // Release string list nodes.
  //
  StringDepository = FileOptionStrDepository;
  for (DepositoryIndex = 0; DepositoryIndex < STRING_DEPOSITORY_NUMBER; DepositoryIndex++) {
    CurrentListNode = StringDepository->ListHead;
    for (NodeIndex = 0; NodeIndex < StringDepository->TotalNodeNumber; NodeIndex++) {
      NextListNode = CurrentListNode->Next;
      FreePool (CurrentListNode);
      CurrentListNode = NextListNode;
    }

    StringDepository++;
  }
  //
  // Release string depository.
  //
  FreePool (FileOptionStrDepository);
}

/**
  Start boot maintenance manager

  @retval EFI_SUCCESS If BMM is invoked successfully.
  @return Other value if BMM return unsuccessfully.

**/
EFI_STATUS
BdsStartBootMaint (
  VOID
  )
{
  EFI_STATUS      Status;
  LIST_ENTRY      BdsBootOptionList;

  InitializeListHead (&BdsBootOptionList);

  //
  // Connect all prior to entering the platform setup menu.
  //
  if (!gConnectAllHappened) {
    BdsLibConnectAllDriversToAllControllers ();
    gConnectAllHappened = TRUE;
  }
  //
  // Have chance to enumerate boot device
  //
  BdsLibEnumerateAllBootOption (&BdsBootOptionList);

  //
  // Init the BMM
  //
  Status = InitializeBM ();

  return Status;
}

/**
  Dispatch BMM formset and FileExplorer formset.


  @param CallbackData    The BMM context data.

  @retval EFI_SUCCESS If function complete successfully.
  @return Other value if the Setup Browser process BMM's pages and
           return unsuccessfully.

**/
EFI_STATUS
FormSetDispatcher (
  IN  BMM_CALLBACK_DATA    *CallbackData
  )
{
  EFI_STATUS                 Status;
  EFI_BROWSER_ACTION_REQUEST ActionRequest;

  while (TRUE) {
    UpdatePageId (CallbackData, FORM_MAIN_ID);

    ActionRequest = EFI_BROWSER_ACTION_REQUEST_NONE;
    Status = gFormBrowser2->SendForm (
                             gFormBrowser2,
                             &CallbackData->BmmHiiHandle,
                             1,
                             &mBootMaintGuid,
                             0,
                             NULL,
                             &ActionRequest
                             );
    if (ActionRequest == EFI_BROWSER_ACTION_REQUEST_RESET) {
      EnableResetRequired ();
    }

    ReclaimStringDepository ();

    //
    // When this Formset returns, check if we are going to explore files.
    //
    if (FileExplorerStateInActive != CallbackData->FeCurrentState) {
      UpdateFileExplorer (CallbackData, 0);

      ActionRequest = EFI_BROWSER_ACTION_REQUEST_NONE;
      Status = gFormBrowser2->SendForm (
                               gFormBrowser2,
                               &CallbackData->FeHiiHandle,
                               1,
                               &mFileExplorerGuid,
                               0,
                               NULL,
                               &ActionRequest
                               );
      if (ActionRequest == EFI_BROWSER_ACTION_REQUEST_RESET) {
        EnableResetRequired ();
      }

      CallbackData->FeCurrentState    = FileExplorerStateInActive;
      CallbackData->FeDisplayContext  = FileExplorerDisplayUnknown;
      ReclaimStringDepository ();
    } else {
      break;
    }
  }

  return Status;
}


/**
  Deletete the Boot Option from EFI Variable. The Boot Order Arrray
  is also updated.

  @param OptionNumber    The number of Boot option want to be deleted.
  @param BootOrder       The Boot Order array.
  @param BootOrderSize   The size of the Boot Order Array.

  @retval  EFI_SUCCESS           The Boot Option Variable was found and removed
  @retval  EFI_UNSUPPORTED       The Boot Option Variable store was inaccessible
  @retval  EFI_NOT_FOUND         The Boot Option Variable was not found
**/
EFI_STATUS
EFIAPI
BdsDeleteBootOption (
  IN UINTN                       OptionNumber,
  IN OUT UINT16                  *BootOrder,
  IN OUT UINTN                   *BootOrderSize
  )
{
  UINT16      BootOption[100];
  UINTN       Index;
  EFI_STATUS  Status;
  UINTN       Index2Del;

  Status    = EFI_SUCCESS;
  Index2Del = 0;

  UnicodeSPrint (BootOption, sizeof (BootOption), L"Boot%04x", OptionNumber);
  Status = EfiLibDeleteVariable (BootOption, &gEfiGlobalVariableGuid);
  
  //
  // adjust boot order array
  //
  for (Index = 0; Index < *BootOrderSize / sizeof (UINT16); Index++) {
    if (BootOrder[Index] == OptionNumber) {
      Index2Del = Index;
      break;
    }
  }

  if (Index != *BootOrderSize / sizeof (UINT16)) {
    for (Index = 0; Index < *BootOrderSize / sizeof (UINT16) - 1; Index++) {
      if (Index >= Index2Del) {
        BootOrder[Index] = BootOrder[Index + 1];
      }
    }

    *BootOrderSize -= sizeof (UINT16);
  }

  return Status;

}