/*++

Copyright (c) 2006 - 2007, Intel Corporation
All rights reserved. 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.

Module Name:

  BootMaint.c

Abstract:

  Boot Maintainence Main File

--*/

#include "Generic/Bds.h"
#include "BootMaint.h"
#include "BdsStrDefs.h"
#include "formguid.h"

//
// Form binary for Boot Maintenance
//
extern UINT8    bmBin[];
extern UINT8    FEBin[];
extern EFI_GUID gBdsStringPackGuid;
extern BOOLEAN  gConnectAllHappened;

EFI_GUID        EfiLegacyDevOrderGuid = EFI_LEGACY_DEV_ORDER_VARIABLE_GUID;

VOID
InitAllMenu (
  IN  BMM_CALLBACK_DATA    *CallbackData
  );

VOID
FreeAllMenu (
  VOID
  );

EFI_STATUS
CreateMenuStringToken (
  IN BMM_CALLBACK_DATA                *CallbackData,
  IN EFI_HII_HANDLE                   HiiHandle,
  IN BM_MENU_OPTION                   *MenuOption
  )
/*++
Routine Description:

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

Arguments:

  HiiHandle       - Hii Handle of the package to be updated.

  MenuOption      - The Menu whose string tokens need to be created

Returns:

  EFI_SUCCESS     - string tokens created successfully

  others          - contain some errors

--*/
{
  BM_MENU_ENTRY *NewMenuEntry;
  UINTN         Index;

  for (Index = 0; Index < MenuOption->MenuNumber; Index++) {
    NewMenuEntry = BOpt_GetMenuEntry (MenuOption, Index);
    CallbackData->Hii->NewString (
                        CallbackData->Hii,
                        NULL,
                        HiiHandle,
                        &NewMenuEntry->DisplayStringToken,
                        NewMenuEntry->DisplayString
                        );

    if (NULL == NewMenuEntry->HelpString) {
      NewMenuEntry->HelpStringToken = NewMenuEntry->DisplayStringToken;
    } else {
      CallbackData->Hii->NewString (
                          CallbackData->Hii,
                          NULL,
                          HiiHandle,
                          &NewMenuEntry->HelpStringToken,
                          NewMenuEntry->HelpString
                          );
    }
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
DriverCallback (
  IN EFI_FORM_CALLBACK_PROTOCOL       *This,
  IN UINT16                           KeyValue,
  IN EFI_IFR_DATA_ARRAY               *Data,
  OUT EFI_HII_CALLBACK_PACKET         **Packet
  )
/*++
Routine Description:

  Callback Function for boot maintenance utility user interface interaction.

Arguments:

  This            - File explorer callback protocol pointer.
  KeyValue        - Key value to identify the type of data to expect.
  Data            - A pointer to the data being sent to the original exporting driver.
  Packet          - A pointer to a packet of information which a driver passes back to the browser.

Returns:

  EFI_SUCCESS     - Callback ended successfully.
  Others          - Contain some errors.

--*/
{
  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             *Location;
  UINT8             *DisMap;
  FORM_ID           FormId;

  OldValue                        = 0;
  NewValue                        = 0;
  Number                          = 0;
  OldLegacyDev                    = NULL;
  NewLegacyDev                    = NULL;
  NewValuePos                     = 0;
  DisMap                          = NULL;

  Private                         = BMM_CALLBACK_DATA_FROM_THIS (This);
  UpdateData->FormCallbackHandle  = (EFI_PHYSICAL_ADDRESS) (UINTN) Private->BmmCallbackHandle;
  CurrentFakeNVMap                = (BMM_FAKE_NV_DATA *) Data->NvRamMap;
  Private->BmmFakeNvData          = CurrentFakeNVMap;
  Location                        = (UINT8 *) &UpdateData->Data;

  UpdatePageId (Private, KeyValue);

  //
  // 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) &&
      (KeyValue >= LEGACY_FD_QUESTION_ID) &&
       (KeyValue < (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) (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) (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) (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 (KeyValue < FILE_OPTION_OFFSET) {
    if (KeyValue < NORMAL_GOTO_OFFSET) {
      switch (KeyValue) {
      case KEY_VALUE_BOOT_FROM_FILE:
        Private->FeCurrentState = BOOT_FROM_FILE_STATE;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        CreateCallbackPacket (Packet, EXIT_REQUIRED);

        break;

      case FORM_BOOT_ADD_ID:
        Private->FeCurrentState = ADD_BOOT_OPTION_STATE;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        CreateCallbackPacket (Packet, EXIT_REQUIRED);
        break;

      case FORM_DRV_ADD_FILE_ID:
        Private->FeCurrentState = ADD_DRIVER_OPTION_STATE;

        //
        // Exit Bmm main formset to send File Explorer formset.
        //
        CreateCallbackPacket (Packet, EXIT_REQUIRED);

        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 (KeyValue, 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 (KeyValue, 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 (KeyValue, Private);
        UpdateSetLegacyDeviceOrderPage (KeyValue, Private);
        break;

      case KEY_VALUE_SAVE_AND_EXIT:
      case KEY_VALUE_NO_SAVE_AND_EXIT:

        if (KeyValue == KEY_VALUE_SAVE_AND_EXIT) {
          Status = ApplyChangeHandler (Private, CurrentFakeNVMap, Private->BmmPreviousPageId);
          if (EFI_ERROR (Status)) {
            return Status;
          }
        } else if (KeyValue == 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.
        //
        CreateCallbackPacket (Packet, NV_NOT_CHANGED);
        break;

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

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

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

  return EFI_SUCCESS;
}

EFI_STATUS
ApplyChangeHandler (
  IN  BMM_CALLBACK_DATA               *Private,
  IN  BMM_FAKE_NV_DATA                *CurrentFakeNVMap,
  IN  FORM_ID                         FormId
  )
/*++

Routine Description:

  Function handling request to apply changes for BMM pages.

Arguments:

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

Returns:

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

--*/
{
  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++) {
      NewMenuEntry            = BOpt_GetMenuEntry (&BootOptionMenu, Index);
      NewLoadContext          = (BM_LOAD_CONTEXT *) NewMenuEntry->VariableContext;
      NewLoadContext->Deleted = CurrentFakeNVMap->BootOptionDel[Index];
    }

    Var_DelBootOption ();
    break;

  case FORM_DRV_DEL_ID:
    for (Index = 0; Index < DriverOptionMenu.MenuNumber; Index++) {
      NewMenuEntry            = BOpt_GetMenuEntry (&DriverOptionMenu, Index);
      NewLoadContext          = (BM_LOAD_CONTEXT *) NewMenuEntry->VariableContext;
      NewLoadContext->Deleted = CurrentFakeNVMap->DriverOptionDel[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:
    Status = gRT->SetVariable (
                    L"Timeout",
                    &gEfiGlobalVariableGuid,
                    VAR_FLAG,
                    sizeof (UINT16),
                    &(CurrentFakeNVMap->BootTimeOut)
                    );
    if (EFI_ERROR (Status)) {
      goto Error;
    }

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

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

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

    ASSERT (NewMenuEntry != NULL);

    NewTerminalContext                = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;

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

    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;
      NewConsoleContext->IsActive = CurrentFakeNVMap->ConsoleCheck[Index];
    }

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

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

    for (Index = 0; Index < TerminalMenu.MenuNumber; Index++) {
      NewMenuEntry                  = BOpt_GetMenuEntry (&TerminalMenu, Index);
      NewTerminalContext            = (BM_TERMINAL_CONTEXT *) NewMenuEntry->VariableContext;
      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;
}

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, 100);
    break;

  case FORM_BOOT_DEL_ID:
    for (Index = 0; Index < BootOptionMenu.MenuNumber; Index++) {
      CurrentFakeNVMap->BootOptionDel[Index] = 0x00;
    }
    break;

  case FORM_DRV_DEL_ID:
    for (Index = 0; Index < DriverOptionMenu.MenuNumber; Index++) {
      CurrentFakeNVMap->DriverOptionDel[Index] = 0x00;
    }
    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;
  }
}

EFI_STATUS
EFIAPI
NvWrite (
  IN     EFI_FORM_CALLBACK_PROTOCOL              *This,
  IN     CHAR16                                  *VariableName,
  IN     EFI_GUID                                *VendorGuid,
  OUT    UINT32                                  Attributes OPTIONAL,
  IN OUT UINTN                                   DataSize,
  OUT    VOID                                    *Buffer,
  OUT    BOOLEAN                                 *ResetRequired
  )
{
  //
  // Do nothing here. Just to catch the F10, we use "Apply Changes" tag to save.
  //
  return EFI_SUCCESS;
}

EFI_STATUS
InitializeBM (
  VOID
  )
/*++
Routine Description:

  Initialize the Boot Maintenance Utitliy

Arguments:

  ImageHandle     - caller provided handle

  SystemTable     - caller provided system tables

Returns:

  EFI_SUCCESS     - utility ended successfully

  others          - contain some errors

--*/
{
  EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  EFI_HII_PACKAGES          *PackageList;
  BMM_CALLBACK_DATA         *BmmCallbackInfo;
  EFI_HII_PROTOCOL          *Hii;
  EFI_HII_HANDLE            HiiHandle;
  EFI_STATUS                Status;
  EFI_HANDLE                Handle;
  UINT8                     *Ptr;
  UINT8                     *Location;

  Status      = EFI_SUCCESS;
  UpdateData  = NULL;
  //
  // Initialize EfiUtilityLib and EfiDriverLib
  // Since many functions in UtilityLib must be used and
  // SetupBrowser use DriverLib
  //
  //
  // There should be only one EFI_HII_PROTOCOL Image
  //
  Status = EfiLibLocateProtocol (&gEfiHiiProtocolGuid, &Hii);
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Create CallbackData structures for Driver Callback
  //
  BmmCallbackInfo = AllocateZeroPool (sizeof (BMM_CALLBACK_DATA));
  if (!BmmCallbackInfo) {
    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) {
    SafeFreePool (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->BmmFakeNvData  = &BmmCallbackInfo->BmmOldFakeNVData;

  ZeroMem (BmmCallbackInfo->BmmFakeNvData, sizeof (BMM_FAKE_NV_DATA));

  BmmCallbackInfo->Signature                  = BMM_CALLBACK_DATA_SIGNATURE;
  BmmCallbackInfo->Hii                        = Hii;
  BmmCallbackInfo->BmmDriverCallback.NvRead   = NULL;
  BmmCallbackInfo->BmmDriverCallback.NvWrite  = NvWrite;
  BmmCallbackInfo->BmmDriverCallback.Callback = DriverCallback;
  BmmCallbackInfo->BmmPreviousPageId          = FORM_MAIN_ID;
  BmmCallbackInfo->BmmCurrentPageId           = FORM_MAIN_ID;
  BmmCallbackInfo->FeDriverCallback.NvRead    = NULL;
  BmmCallbackInfo->FeDriverCallback.NvWrite   = NvWrite;
  BmmCallbackInfo->FeDriverCallback.Callback  = FileExplorerCallback;
  BmmCallbackInfo->FeCurrentState             = INACTIVE_STATE;
  BmmCallbackInfo->FeDisplayContext           = UNKNOWN_CONTEXT;

  //
  // Install bmm callback protocol interface
  //
  Handle = NULL;
  Status = gBS->InstallProtocolInterface (
                  &Handle,
                  &gEfiFormCallbackProtocolGuid,
                  EFI_NATIVE_INTERFACE,
                  &BmmCallbackInfo->BmmDriverCallback
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  BmmCallbackInfo->BmmCallbackHandle = Handle;

  //
  // Install file explorer callback protocol interface
  //
  Handle = NULL;
  Status = gBS->InstallProtocolInterface (
                  &Handle,
                  &gEfiFormCallbackProtocolGuid,
                  EFI_NATIVE_INTERFACE,
                  &BmmCallbackInfo->FeDriverCallback
                  );

  if (EFI_ERROR (Status)) {
    return Status;
  }

  BmmCallbackInfo->FeCallbackHandle = Handle;

  //
  // Post our VFR to the HII database.
  //
  PackageList = PreparePackages (1, &gBdsStringPackGuid, bmBin);
  Status      = Hii->NewPack (Hii, PackageList, &HiiHandle);
  FreePool (PackageList);

  BmmCallbackInfo->BmmHiiHandle = HiiHandle;

  PackageList                   = PreparePackages (1, &gBdsStringPackGuid, FEBin);
  Status                        = Hii->NewPack (Hii, PackageList, &HiiHandle);
  FreePool (PackageList);

  BmmCallbackInfo->FeHiiHandle = HiiHandle;

  //
  // Allocate space for creation of Buffer
  //
  UpdateData = AllocateZeroPool (UPDATE_DATA_SIZE);
  if (!UpdateData) {
    SafeFreePool (BmmCallbackInfo->LoadContext);
    SafeFreePool (BmmCallbackInfo);
    return EFI_OUT_OF_RESOURCES;
  }
  //
  // Initialize UpdateData structure
  //
  RefreshUpdateData (TRUE, (EFI_PHYSICAL_ADDRESS) (UINTN) BmmCallbackInfo->BmmCallbackHandle, FALSE, 0, 0);

  Location = (UINT8 *) &UpdateData->Data;

  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);
  }

  Location  = (UINT8 *) &UpdateData->Data;
  Status    = EfiLibLocateProtocol (&gEfiLegacyBiosProtocolGuid, &LegacyBios);
  if (!EFI_ERROR (Status)) {
    //
    // If LegacyBios Protocol is installed, add 3 tags about legacy boot option
    // in BootOption form: legacy FD/HD/CD/NET/BEV
    //
    UpdateData->DataCount = 5;
    CreateGotoOpCode (
      FORM_SET_FD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_FD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_FD_ORDER_TITLE),
      EFI_IFR_FLAG_INTERACTIVE | EFI_IFR_FLAG_NV_ACCESS,
      FORM_SET_FD_ORDER_ID,
      Location
      );

    Location = Location + ((EFI_IFR_OP_HEADER *) Location)->Length;

    CreateGotoOpCode (
      FORM_SET_HD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_HD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_HD_ORDER_TITLE),
      EFI_IFR_FLAG_INTERACTIVE | EFI_IFR_FLAG_NV_ACCESS,
      FORM_SET_HD_ORDER_ID,
      Location
      );

    Location = Location + ((EFI_IFR_OP_HEADER *) Location)->Length;

    CreateGotoOpCode (
      FORM_SET_CD_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_CD_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_CD_ORDER_TITLE),
      EFI_IFR_FLAG_INTERACTIVE | EFI_IFR_FLAG_NV_ACCESS,
      FORM_SET_CD_ORDER_ID,
      Location
      );

    Location = Location + ((EFI_IFR_OP_HEADER *) Location)->Length;

    CreateGotoOpCode (
      FORM_SET_NET_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_NET_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_NET_ORDER_TITLE),
      EFI_IFR_FLAG_INTERACTIVE | EFI_IFR_FLAG_NV_ACCESS,
      FORM_SET_NET_ORDER_ID,
      Location
      );

    Location = Location + ((EFI_IFR_OP_HEADER *) Location)->Length;

    CreateGotoOpCode (
      FORM_SET_BEV_ORDER_ID,
      STRING_TOKEN (STR_FORM_SET_BEV_ORDER_TITLE),
      STRING_TOKEN (STR_FORM_SET_BEV_ORDER_TITLE),
      EFI_IFR_FLAG_INTERACTIVE | EFI_IFR_FLAG_NV_ACCESS,
      FORM_SET_BEV_ORDER_ID,
      Location
      );

    Hii->UpdateForm (
          Hii,
          BmmCallbackInfo->BmmHiiHandle,
          (EFI_FORM_LABEL) FORM_BOOT_LEGACY_DEVICE_ID,
          TRUE,
          UpdateData
          );
  }
  //
  // Dispatch BMM main formset and File Explorer formset.
  //
  FormSetDispatcher (BmmCallbackInfo);

  Hii->ResetStrings (Hii, HiiHandle);

  CleanUpStringDepository ();

  if (EFI_ERROR (Status)) {
    return Status;
  }

  FreeAllMenu ();

  SafeFreePool (BmmCallbackInfo->LoadContext);
  BmmCallbackInfo->LoadContext = NULL;
  SafeFreePool (BmmCallbackInfo);
  BmmCallbackInfo = NULL;
  SafeFreePool (UpdateData);
  UpdateData = NULL;

  return Status;
}

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 ();
}

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

VOID
InitializeStringDepository (
  VOID
  )
/*++
Routine Description:
  Intialize all the string depositories.

Arguments:
  None.

Returns:
  None.
--*/
{
  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;
}

STRING_REF
GetStringTokenFromDepository (
  IN   BMM_CALLBACK_DATA     *CallbackData,
  IN   STRING_DEPOSITORY     *StringDepository
  )
/*++
Routine Description:
  Fetch a usable string node from the string depository and return the string token.

Arguments:
  StringDepository       - Pointer of the string depository.

Returns:
  STRING_REF             - String token.
--*/
{
  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));

    CallbackData->Hii->NewString (
                        CallbackData->Hii,
                        NULL,
                        CallbackData->BmmHiiHandle,
                        &(NextListNode->StringToken),
                        L" "
                        );

    ASSERT (NextListNode->StringToken != 0);

    StringDepository->TotalNodeNumber++;

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

  StringDepository->CurrentNode = NextListNode;

  return StringDepository->CurrentNode->StringToken;
}

VOID
ReclaimStringDepository (
  VOID
  )
/*++
Routine Description:
  Reclaim string depositories by moving the current node pointer to list head..

Arguments:
  None.

Returns:
  None.
--*/
{
  UINTN             DepositoryIndex;
  STRING_DEPOSITORY *StringDepository;

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

VOID
CleanUpStringDepository (
  VOID
  )
/*++
Routine Description:
  Release resource for all the string depositories.

Arguments:
  None.

Returns:
  None.
--*/
{
  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;
      SafeFreePool (CurrentListNode);
      CurrentListNode = NextListNode;
    }

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

EFI_STATUS
BdsStartBootMaint (
  VOID
  )
/*++

Routine Description:
  Start boot maintenance manager

Arguments:

Returns:

--*/
{
  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;
}

EFI_STATUS
FormSetDispatcher (
  IN  BMM_CALLBACK_DATA    *CallbackData
  )
/*++

Routine Description:
  Dispatch BMM formset and FileExplorer formset.

Arguments:

Returns:

--*/
{
  EFI_FORM_BROWSER_PROTOCOL *FormConfig;
  UINT8                     *Location;
  EFI_STATUS                Status;
  UINTN                     Index;
  BM_MENU_ENTRY             *NewMenuEntry;
  BM_FILE_CONTEXT           *NewFileContext;
  BOOLEAN	                 BootMaintMenuResetRequired;

  Location        = NULL;
  Index           = 0;
  NewMenuEntry    = NULL;
  NewFileContext  = NULL;

  //
  // There should only be one Form Configuration protocol
  //
  Status = EfiLibLocateProtocol (&gEfiFormBrowserProtocolGuid, &FormConfig);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  while (1) {
    UpdatePageId (CallbackData, FORM_MAIN_ID);

    BootMaintMenuResetRequired = FALSE;
    Status = FormConfig->SendForm (
                          FormConfig,
                          TRUE,
                          &(CallbackData->BmmHiiHandle),
                          1,
                          NULL,
                          NULL,
                          (UINT8 *) CallbackData->BmmFakeNvData,
                          NULL,
                          &BootMaintMenuResetRequired
                          );

    if (BootMaintMenuResetRequired) {
      EnableResetRequired ();
    }

    ReclaimStringDepository ();

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

      BootMaintMenuResetRequired = FALSE;
      Status = FormConfig->SendForm (
                            FormConfig,
                            TRUE,
                            &(CallbackData->FeHiiHandle),
                            1,
                            NULL,
                            NULL,
                            NULL,
                            NULL,
                            &BootMaintMenuResetRequired
                            );

      if (BootMaintMenuResetRequired) {
        EnableResetRequired ();
      }

      CallbackData->FeCurrentState    = INACTIVE_STATE;
      CallbackData->FeDisplayContext  = UNKNOWN_CONTEXT;
      ReclaimStringDepository ();
    } else {
      break;
    }
  }

  return Status;
}

VOID
CreateCallbackPacket (
  OUT EFI_HII_CALLBACK_PACKET         **Packet,
  IN  UINT16                          Flags
  )
{
  *Packet = (EFI_HII_CALLBACK_PACKET *) AllocateZeroPool (sizeof (EFI_HII_CALLBACK_PACKET) + 2);
  ASSERT (*Packet != NULL);

  (*Packet)->DataArray.EntryCount   = 1;
  (*Packet)->DataArray.NvRamMap     = NULL;
  ((EFI_IFR_DATA_ENTRY *) (&((*Packet)->DataArray) + 1))->Flags  = Flags;
}