[mirror_edk2.git] / MdeModulePkg / Library / GenericBdsLib / BdsMisc.c

/** @file\r
  Misc BDS library function\r
\r
Copyright (c) 2004 - 2008, Intel Corporation. <BR>\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "InternalBdsLib.h"\r
\r
\r
#define MAX_STRING_LEN        200\r
\r
BOOLEAN   mFeaturerSwitch = TRUE;\r
BOOLEAN   mResetRequired  = FALSE;\r
\r
extern UINT16 gPlatformBootTimeOutDefault;\r
\r
\r
/**\r
  Return the default value for system Timeout variable.\r
\r
  @return Timeout value.\r
\r
**/\r
UINT16\r
EFIAPI\r
BdsLibGetTimeout (\r
  VOID\r
  )\r
{\r
  UINT16      Timeout;\r
  UINTN       Size;\r
  EFI_STATUS  Status;\r
\r
  //\r
  // Return Timeout variable or 0xffff if no valid\r
  // Timeout variable exists.\r
  //\r
  Size    = sizeof (UINT16);\r
  Status  = gRT->GetVariable (L"Timeout", &gEfiGlobalVariableGuid, NULL, &Size, &Timeout);\r
  if (EFI_ERROR (Status)) {\r
    //\r
    // According to UEFI 2.0 spec, it should treat the Timeout value as 0xffff\r
    // (default value PcdPlatformBootTimeOutDefault) when L"Timeout" variable is not present.\r
    // To make the current EFI Automatic-Test activity possible, platform can choose other value\r
    // for automatic boot when the variable is not present.\r
    //\r
    Timeout = PcdGet16 (PcdPlatformBootTimeOutDefault);\r
  }\r
\r
  return Timeout;\r
}\r
\r
/**\r
  The function will go through the driver optoin link list, load and start\r
  every driver the driver optoin device path point to.\r
\r
  @param  BdsDriverLists        The header of the current driver option link list\r
\r
**/\r
VOID\r
EFIAPI\r
BdsLibLoadDrivers (\r
  IN LIST_ENTRY                   *BdsDriverLists\r
  )\r
{\r
  EFI_STATUS                Status;\r
  LIST_ENTRY                *Link;\r
  BDS_COMMON_OPTION         *Option;\r
  EFI_HANDLE                ImageHandle;\r
  EFI_LOADED_IMAGE_PROTOCOL *ImageInfo;\r
  UINTN                     ExitDataSize;\r
  CHAR16                    *ExitData;\r
  BOOLEAN                   ReconnectAll;\r
\r
  ReconnectAll = FALSE;\r
\r
  //\r
  // Process the driver option\r
  //\r
  for (Link = BdsDriverLists->ForwardLink; Link != BdsDriverLists; Link = Link->ForwardLink) {\r
    Option = CR (Link, BDS_COMMON_OPTION, Link, BDS_LOAD_OPTION_SIGNATURE);\r
    \r
    //\r
    // If a load option is not marked as LOAD_OPTION_ACTIVE,\r
    // the boot manager will not automatically load the option.\r
    //\r
    if (!IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_ACTIVE)) {\r
      continue;\r
    }\r
    \r
    //\r
    // If a driver load option is marked as LOAD_OPTION_FORCE_RECONNECT,\r
    // then all of the EFI drivers in the system will be disconnected and\r
    // reconnected after the last driver load option is processed.\r
    //\r
    if (IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_FORCE_RECONNECT)) {\r
      ReconnectAll = TRUE;\r
    }\r
    \r
    //\r
    // Make sure the driver path is connected.\r
    //\r
    BdsLibConnectDevicePath (Option->DevicePath);\r
\r
    //\r
    // Load and start the image that Driver#### describes\r
    //\r
    Status = gBS->LoadImage (\r
                    FALSE,\r
                    mBdsImageHandle,\r
                    Option->DevicePath,\r
                    NULL,\r
                    0,\r
                    &ImageHandle\r
                    );\r
\r
    if (!EFI_ERROR (Status)) {\r
      gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **) &ImageInfo);\r
\r
      //\r
      // Verify whether this image is a driver, if not,\r
      // exit it and continue to parse next load option\r
      //\r
      if (ImageInfo->ImageCodeType != EfiBootServicesCode && ImageInfo->ImageCodeType != EfiRuntimeServicesCode) {\r
        gBS->Exit (ImageHandle, EFI_INVALID_PARAMETER, 0, NULL);\r
        continue;\r
      }\r
\r
      if (Option->LoadOptionsSize != 0) {\r
        ImageInfo->LoadOptionsSize  = Option->LoadOptionsSize;\r
        ImageInfo->LoadOptions      = Option->LoadOptions;\r
      }\r
      //\r
      // Before calling the image, enable the Watchdog Timer for\r
      // the 5 Minute period\r
      //\r
      gBS->SetWatchdogTimer (5 * 60, 0x0000, 0x00, NULL);\r
\r
      Status = gBS->StartImage (ImageHandle, &ExitDataSize, &ExitData);\r
      DEBUG ((DEBUG_INFO | DEBUG_LOAD, "Driver Return Status = %r\n", Status));\r
\r
      //\r
      // Clear the Watchdog Timer after the image returns\r
      //\r
      gBS->SetWatchdogTimer (0x0000, 0x0000, 0x0000, NULL);\r
    }\r
  }\r
  \r
  //\r
  // Process the LOAD_OPTION_FORCE_RECONNECT driver option\r
  //\r
  if (ReconnectAll) {\r
    BdsLibDisconnectAllEfi ();\r
    BdsLibConnectAll ();\r
  }\r
\r
}\r
\r
/**\r
  Get the Option Number that does not used.\r
  Try to locate the specific option variable one by one untile find a free number.\r
\r
  @param  VariableName          Indicate if the boot#### or driver#### option\r
\r
  @return The Minimal Free Option Number\r
\r
**/\r
UINT16\r
BdsLibGetFreeOptionNumber (\r
  IN  CHAR16    *VariableName\r
  )\r
{\r
  UINTN         Index;\r
  CHAR16        StrTemp[10];\r
  UINT16        *OptionBuffer;\r
  UINTN         OptionSize;\r
\r
  //\r
  // Try to find the minimum free number from 0, 1, 2, 3....\r
  //\r
  Index = 0;\r
  do {\r
    if (*VariableName == 'B') {\r
      UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Boot%04x", Index);\r
    } else {\r
      UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Driver%04x", Index);\r
    }\r
    //\r
    // try if the option number is used\r
    //\r
    OptionBuffer = BdsLibGetVariableAndSize (\r
                     StrTemp,\r
                     &gEfiGlobalVariableGuid,\r
                     &OptionSize\r
                     );\r
    if (OptionBuffer == NULL) {\r
      break;\r
    }\r
    Index ++;\r
  } while (TRUE);\r
\r
  return ((UINT16) Index);\r
}\r
\r
\r
/**\r
  This function will register the new boot#### or driver#### option base on\r
  the VariableName. The new registered boot#### or driver#### will be linked\r
  to BdsOptionList and also update to the VariableName. After the boot#### or\r
  driver#### updated, the BootOrder or DriverOrder will also be updated.\r
\r
  @param  BdsOptionList         The header of the boot#### or driver#### link list\r
  @param  DevicePath            The device path which the boot#### or driver####\r
                                option present\r
  @param  String                The description of the boot#### or driver####\r
  @param  VariableName          Indicate if the boot#### or driver#### option\r
\r
  @retval EFI_SUCCESS           The boot#### or driver#### have been success\r
                                registered\r
  @retval EFI_STATUS            Return the status of gRT->SetVariable ().\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
BdsLibRegisterNewOption (\r
  IN  LIST_ENTRY                     *BdsOptionList,\r
  IN  EFI_DEVICE_PATH_PROTOCOL       *DevicePath,\r
  IN  CHAR16                         *String,\r
  IN  CHAR16                         *VariableName\r
  )\r
{\r
  EFI_STATUS                Status;\r
  UINTN                     Index;\r
  UINT16                    RegisterOptionNumber;\r
  UINT16                    *TempOptionPtr;\r
  UINTN                     TempOptionSize;\r
  UINT16                    *OptionOrderPtr;\r
  VOID                      *OptionPtr;\r
  UINTN                     OptionSize;\r
  UINT8                     *TempPtr;\r
  EFI_DEVICE_PATH_PROTOCOL  *OptionDevicePath;\r
  CHAR16                    *Description;\r
  CHAR16                    OptionName[10];\r
  BOOLEAN                   UpdateDescription;\r
  UINT16                    BootOrderEntry;\r
  UINTN                     OrderItemNum;\r
\r
\r
  OptionPtr             = NULL;\r
  OptionSize            = 0;\r
  TempPtr               = NULL;\r
  OptionDevicePath      = NULL;\r
  Description           = NULL;\r
  OptionOrderPtr        = NULL;\r
  UpdateDescription     = FALSE;\r
  Status                = EFI_SUCCESS;\r
  ZeroMem (OptionName, sizeof (OptionName));\r
\r
  TempOptionSize = 0;\r
  TempOptionPtr = BdsLibGetVariableAndSize (\r
                    VariableName,\r
                    &gEfiGlobalVariableGuid,\r
                    &TempOptionSize\r
                    );\r
\r
  //\r
  // Compare with current option variable\r
  //\r
  for (Index = 0; Index < TempOptionSize / sizeof (UINT16); Index++) {\r
\r
    if (*VariableName == 'B') {\r
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", TempOptionPtr[Index]);\r
    } else {\r
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", TempOptionPtr[Index]);\r
    }\r
\r
    OptionPtr = BdsLibGetVariableAndSize (\r
                  OptionName,\r
                  &gEfiGlobalVariableGuid,\r
                  &OptionSize\r
                  );\r
    if (OptionPtr == NULL) {\r
      continue;\r
    }\r
    TempPtr         =   OptionPtr;\r
    TempPtr         +=  sizeof (UINT32) + sizeof (UINT16);\r
    Description     =   (CHAR16 *) TempPtr;\r
    TempPtr         +=  StrSize ((CHAR16 *) TempPtr);\r
    OptionDevicePath =  (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;\r
\r
    //\r
    // Notes: the description may will change base on the GetStringToken\r
    //\r
    if (CompareMem (OptionDevicePath, DevicePath, GetDevicePathSize (OptionDevicePath)) == 0) {\r
      if (CompareMem (Description, String, StrSize (Description)) == 0) { \r
        //\r
        // Got the option, so just return\r
        //\r
        FreePool (OptionPtr);\r
        FreePool (TempOptionPtr);\r
        return EFI_SUCCESS;\r
      } else {\r
        //\r
        // Option description changed, need update.\r
        //\r
        UpdateDescription = TRUE;\r
        FreePool (OptionPtr);\r
        break;\r
      }\r
    }\r
\r
    FreePool (OptionPtr);\r
  }\r
\r
  OptionSize          = sizeof (UINT32) + sizeof (UINT16) + StrSize (String);\r
  OptionSize          += GetDevicePathSize (DevicePath);\r
  OptionPtr           = AllocateZeroPool (OptionSize);\r
  ASSERT (OptionPtr != NULL);\r
  \r
  TempPtr             = OptionPtr;\r
  *(UINT32 *) TempPtr = LOAD_OPTION_ACTIVE;\r
  TempPtr             += sizeof (UINT32);\r
  *(UINT16 *) TempPtr = (UINT16) GetDevicePathSize (DevicePath);\r
  TempPtr             += sizeof (UINT16);\r
  CopyMem (TempPtr, String, StrSize (String));\r
  TempPtr             += StrSize (String);\r
  CopyMem (TempPtr, DevicePath, GetDevicePathSize (DevicePath));\r
\r
  if (UpdateDescription) {\r
    //\r
    // The number in option#### to be updated\r
    //\r
    RegisterOptionNumber = TempOptionPtr[Index];\r
  } else {\r
    //\r
    // The new option#### number\r
    //\r
    RegisterOptionNumber = BdsLibGetFreeOptionNumber(VariableName);\r
  }\r
\r
  if (*VariableName == 'B') {\r
    UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", RegisterOptionNumber);\r
  } else {\r
    UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", RegisterOptionNumber);\r
  }\r
\r
  Status = gRT->SetVariable (\r
                  OptionName,\r
                  &gEfiGlobalVariableGuid,\r
                  EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,\r
                  OptionSize,\r
                  OptionPtr\r
                  );\r
  //\r
  // Return if only need to update a changed description or fail to set option.\r
  //\r
  if (EFI_ERROR (Status) || UpdateDescription) {\r
    FreePool (OptionPtr);\r
    if (TempOptionPtr != NULL) {\r
      FreePool (TempOptionPtr);\r
    }\r
    return Status;\r
  }\r
\r
  FreePool (OptionPtr);\r
\r
  //\r
  // Update the option order variable\r
  //\r
\r
  //\r
  // If no option order\r
  //\r
  if (TempOptionSize == 0) {\r
    BootOrderEntry = 0;\r
    Status = gRT->SetVariable (\r
                    VariableName,\r
                    &gEfiGlobalVariableGuid,\r
                    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,\r
                    sizeof (UINT16),\r
                    &BootOrderEntry\r
                    );\r
    if (TempOptionPtr != NULL) {\r
      FreePool (TempOptionPtr);\r
    }\r
    return Status;\r
  }\r
\r
  //\r
  // Append the new option number to the original option order\r
  //\r
  OrderItemNum = (TempOptionSize / sizeof (UINT16)) + 1 ;\r
  OptionOrderPtr = AllocateZeroPool ( OrderItemNum * sizeof (UINT16));\r
  ASSERT (OptionOrderPtr!= NULL);\r
  \r
  CopyMem (OptionOrderPtr, TempOptionPtr, (OrderItemNum - 1) * sizeof (UINT16));\r
\r
  OptionOrderPtr[Index] = RegisterOptionNumber;\r
\r
  Status = gRT->SetVariable (\r
                  VariableName,\r
                  &gEfiGlobalVariableGuid,\r
                  EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,\r
                  OrderItemNum * sizeof (UINT16),\r
                  OptionOrderPtr\r
                  );\r
  FreePool (TempOptionPtr);\r
  FreePool (OptionOrderPtr);\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Build the boot#### or driver#### option from the VariableName, the\r
  build boot#### or driver#### will also be linked to BdsCommonOptionList.\r
\r
  @param  BdsCommonOptionList   The header of the boot#### or driver#### option\r
                                link list\r
  @param  VariableName          EFI Variable name indicate if it is boot#### or\r
                                driver####\r
\r
  @retval BDS_COMMON_OPTION     Get the option just been created\r
  @retval NULL                  Failed to get the new option\r
\r
**/\r
BDS_COMMON_OPTION *\r
EFIAPI\r
BdsLibVariableToOption (\r
  IN OUT LIST_ENTRY                   *BdsCommonOptionList,\r
  IN  CHAR16                          *VariableName\r
  )\r
{\r
  UINT32                    Attribute;\r
  UINT16                    FilePathSize;\r
  UINT8                     *Variable;\r
  UINT8                     *TempPtr;\r
  UINTN                     VariableSize;\r
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;\r
  BDS_COMMON_OPTION         *Option;\r
  VOID                      *LoadOptions;\r
  UINT32                    LoadOptionsSize;\r
  CHAR16                    *Description;\r
  UINT8                     NumOff;\r
  //\r
  // Read the variable. We will never free this data.\r
  //\r
  Variable = BdsLibGetVariableAndSize (\r
              VariableName,\r
              &gEfiGlobalVariableGuid,\r
              &VariableSize\r
              );\r
  if (Variable == NULL) {\r
    return NULL;\r
  }\r
  //\r
  // Notes: careful defined the variable of Boot#### or\r
  // Driver####, consider use some macro to abstract the code\r
  //\r
  //\r
  // Get the option attribute\r
  //\r
  TempPtr   =  Variable;\r
  Attribute =  *(UINT32 *) Variable;\r
  TempPtr   += sizeof (UINT32);\r
\r
  //\r
  // Get the option's device path size\r
  //\r
  FilePathSize =  *(UINT16 *) TempPtr;\r
  TempPtr      += sizeof (UINT16);\r
\r
  //\r
  // Get the option's description string\r
  //\r
  Description = (CHAR16 *) TempPtr;\r
\r
  //\r
  // Get the option's description string size\r
  //\r
  TempPtr     += StrSize ((CHAR16 *) TempPtr);\r
\r
  //\r
  // Get the option's device path\r
  //\r
  DevicePath =  (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;\r
  TempPtr    += FilePathSize;\r
\r
  LoadOptions     = TempPtr;\r
  LoadOptionsSize = (UINT32) (VariableSize - (UINTN) (TempPtr - Variable));\r
\r
  //\r
  // The Console variables may have multiple device paths, so make\r
  // an Entry for each one.\r
  //\r
  Option = AllocateZeroPool (sizeof (BDS_COMMON_OPTION));\r
  if (Option == NULL) {\r
    return NULL;\r
  }\r
\r
  Option->Signature   = BDS_LOAD_OPTION_SIGNATURE;\r
  Option->DevicePath  = AllocateZeroPool (GetDevicePathSize (DevicePath));\r
  CopyMem (Option->DevicePath, DevicePath, GetDevicePathSize (DevicePath));\r
  Option->Attribute   = Attribute;\r
  Option->Description = AllocateZeroPool (StrSize (Description));\r
  CopyMem (Option->Description, Description, StrSize (Description));\r
  Option->LoadOptions = AllocateZeroPool (LoadOptionsSize);\r
  CopyMem (Option->LoadOptions, LoadOptions, LoadOptionsSize);\r
  Option->LoadOptionsSize = LoadOptionsSize;\r
\r
  //\r
  // Get the value from VariableName Unicode string\r
  // since the ISO standard assumes ASCII equivalent abbreviations, we can be safe in converting this\r
  // Unicode stream to ASCII without any loss in meaning.\r
  //\r
  if (*VariableName == 'B') {\r
    NumOff = sizeof (L"Boot")/sizeof(CHAR16) -1 ;\r
    Option->BootCurrent = (UINT16) ((VariableName[NumOff]  -'0') * 0x1000);\r
    Option->BootCurrent = (UINT16) (Option->BootCurrent + ((VariableName[NumOff+1]-'0') * 0x100));\r
    Option->BootCurrent = (UINT16) (Option->BootCurrent +  ((VariableName[NumOff+2]-'0') * 0x10));\r
    Option->BootCurrent = (UINT16) (Option->BootCurrent + ((VariableName[NumOff+3]-'0')));\r
  }\r
  //\r
  // Insert active entry to BdsDeviceList\r
  //\r
  if ((Option->Attribute & LOAD_OPTION_ACTIVE) == LOAD_OPTION_ACTIVE) {\r
    InsertTailList (BdsCommonOptionList, &Option->Link);\r
    FreePool (Variable);\r
    return Option;\r
  }\r
\r
  FreePool (Variable);\r
  FreePool (Option);\r
  return NULL;\r
\r
}\r
\r
/**\r
  Process BootOrder, or DriverOrder variables, by calling\r
  BdsLibVariableToOption () for each UINT16 in the variables.\r
\r
  @param  BdsCommonOptionList   The header of the option list base on variable\r
                                VariableName\r
  @param  VariableName          EFI Variable name indicate the BootOrder or\r
                                DriverOrder\r
\r
  @retval EFI_SUCCESS           Success create the boot option or driver option\r
                                list\r
  @retval EFI_OUT_OF_RESOURCES  Failed to get the boot option or driver option list\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
BdsLibBuildOptionFromVar (\r
  IN  LIST_ENTRY                      *BdsCommonOptionList,\r
  IN  CHAR16                          *VariableName\r
  )\r
{\r
  UINT16            *OptionOrder;\r
  UINTN             OptionOrderSize;\r
  UINTN             Index;\r
  BDS_COMMON_OPTION *Option;\r
  CHAR16            OptionName[20];\r
\r
  //\r
  // Zero Buffer in order to get all BOOT#### variables\r
  //\r
  ZeroMem (OptionName, sizeof (OptionName));\r
\r
  //\r
  // Read the BootOrder, or DriverOrder variable.\r
  //\r
  OptionOrder = BdsLibGetVariableAndSize (\r
                  VariableName,\r
                  &gEfiGlobalVariableGuid,\r
                  &OptionOrderSize\r
                  );\r
  if (OptionOrder == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  for (Index = 0; Index < OptionOrderSize / sizeof (UINT16); Index++) {\r
    if (*VariableName == 'B') {\r
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", OptionOrder[Index]);\r
    } else {\r
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", OptionOrder[Index]);\r
    }\r
\r
    Option              = BdsLibVariableToOption (BdsCommonOptionList, OptionName);\r
    Option->BootCurrent = OptionOrder[Index];\r
\r
  }\r
\r
  FreePool (OptionOrder);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Get boot mode by looking up configuration table and parsing HOB list\r
\r
  @param  BootMode              Boot mode from PEI handoff HOB.\r
\r
  @retval EFI_SUCCESS           Successfully get boot mode\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
BdsLibGetBootMode (\r
  OUT EFI_BOOT_MODE       *BootMode\r
  )\r
{\r
  *BootMode = GetBootModeHob ();\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Read the EFI variable (VendorGuid/Name) and return a dynamically allocated\r
  buffer, and the size of the buffer. If failure return NULL.\r
\r
  @param  Name                  String part of EFI variable name\r
  @param  VendorGuid            GUID part of EFI variable name\r
  @param  VariableSize          Returns the size of the EFI variable that was read\r
\r
  @return Dynamically allocated memory that contains a copy of the EFI variable.\r
  @return Caller is responsible freeing the buffer.\r
  @retval NULL                  Variable was not read\r
\r
**/\r
VOID *\r
EFIAPI\r
BdsLibGetVariableAndSize (\r
  IN  CHAR16              *Name,\r
  IN  EFI_GUID            *VendorGuid,\r
  OUT UINTN               *VariableSize\r
  )\r
{\r
  EFI_STATUS  Status;\r
  UINTN       BufferSize;\r
  VOID        *Buffer;\r
\r
  Buffer = NULL;\r
\r
  //\r
  // Pass in a zero size buffer to find the required buffer size.\r
  //\r
  BufferSize  = 0;\r
  Status      = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);\r
  if (Status == EFI_BUFFER_TOO_SMALL) {\r
    //\r
    // Allocate the buffer to return\r
    //\r
    Buffer = AllocateZeroPool (BufferSize);\r
    if (Buffer == NULL) {\r
      return NULL;\r
    }\r
    //\r
    // Read variable into the allocated buffer.\r
    //\r
    Status = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);\r
    if (EFI_ERROR (Status)) {\r
      BufferSize = 0;\r
    }\r
  }\r
\r
  *VariableSize = BufferSize;\r
  return Buffer;\r
}\r
\r
/**\r
  Delete the instance in Multi which matches partly with Single instance\r
\r
  @param  Multi                 A pointer to a multi-instance device path data\r
                                structure.\r
  @param  Single                A pointer to a single-instance device path data\r
                                structure.\r
\r
  @return This function will remove the device path instances in Multi which partly\r
          match with the Single, and return the result device path. If there is no\r
          remaining device path as a result, this function will return NULL.\r
\r
**/\r
EFI_DEVICE_PATH_PROTOCOL *\r
EFIAPI\r
BdsLibDelPartMatchInstance (\r
  IN     EFI_DEVICE_PATH_PROTOCOL  *Multi,\r
  IN     EFI_DEVICE_PATH_PROTOCOL  *Single\r
  )\r
{\r
  EFI_DEVICE_PATH_PROTOCOL  *Instance;\r
  EFI_DEVICE_PATH_PROTOCOL  *NewDevicePath;\r
  EFI_DEVICE_PATH_PROTOCOL  *TempNewDevicePath;\r
  UINTN                     InstanceSize;\r
  UINTN                     SingleDpSize;\r
  UINTN                     Size;\r
\r
  NewDevicePath     = NULL;\r
  TempNewDevicePath = NULL;\r
\r
  if (Multi == NULL || Single == NULL) {\r
    return Multi;\r
  }\r
\r
  Instance        =  GetNextDevicePathInstance (&Multi, &InstanceSize);\r
  SingleDpSize    =  GetDevicePathSize (Single) - END_DEVICE_PATH_LENGTH;\r
  InstanceSize    -= END_DEVICE_PATH_LENGTH;\r
\r
  while (Instance != NULL) {\r
\r
    Size = (SingleDpSize < InstanceSize) ? SingleDpSize : InstanceSize;\r
\r
    if ((CompareMem (Instance, Single, Size) != 0)) {\r
      //\r
      // Append the device path instance which does not match with Single\r
      //\r
      TempNewDevicePath = NewDevicePath;\r
      NewDevicePath = AppendDevicePathInstance (NewDevicePath, Instance);\r
      if (TempNewDevicePath != NULL) {\r
        FreePool(TempNewDevicePath);\r
      }\r
    }\r
    FreePool(Instance);\r
    Instance = GetNextDevicePathInstance (&Multi, &InstanceSize);\r
    InstanceSize  -= END_DEVICE_PATH_LENGTH;\r
  }\r
\r
  return NewDevicePath;\r
}\r
\r
/**\r
  Function compares a device path data structure to that of all the nodes of a\r
  second device path instance.\r
\r
  @param  Multi                 A pointer to a multi-instance device path data\r
                                structure.\r
  @param  Single                A pointer to a single-instance device path data\r
                                structure.\r
\r
  @retval TRUE                  If the Single is contained within Multi\r
  @retval FALSE                 The Single is not match within Multi\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
BdsLibMatchDevicePaths (\r
  IN  EFI_DEVICE_PATH_PROTOCOL  *Multi,\r
  IN  EFI_DEVICE_PATH_PROTOCOL  *Single\r
  )\r
{\r
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;\r
  EFI_DEVICE_PATH_PROTOCOL  *DevicePathInst;\r
  UINTN                     Size;\r
\r
  if (Multi == NULL || Single  == NULL) {\r
    return FALSE;\r
  }\r
\r
  DevicePath      = Multi;\r
  DevicePathInst  = GetNextDevicePathInstance (&DevicePath, &Size);\r
\r
  //\r
  // Search for the match of 'Single' in 'Multi'\r
  //\r
  while (DevicePathInst != NULL) {\r
    //\r
    // If the single device path is found in multiple device paths,\r
    // return success\r
    //\r
    if (CompareMem (Single, DevicePathInst, Size) == 0) {\r
      FreePool (DevicePathInst);\r
      return TRUE;\r
    }\r
\r
    FreePool (DevicePathInst);\r
    DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);\r
  }\r
\r
  return FALSE;\r
}\r
\r
/**\r
  This function prints a series of strings.\r
\r
  @param  ConOut                Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL\r
  @param  ...                   A variable argument list containing series of\r
                                strings, the last string must be NULL.\r
\r
  @retval EFI_SUCCESS           Success print out the string using ConOut.\r
  @retval EFI_STATUS            Return the status of the ConOut->OutputString ().\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
BdsLibOutputStrings (\r
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL   *ConOut,\r
  ...\r
  )\r
{\r
  VA_LIST     Args;\r
  EFI_STATUS  Status;\r
  CHAR16      *String;\r
\r
  Status = EFI_SUCCESS;\r
  VA_START (Args, ConOut);\r
\r
  while (!EFI_ERROR (Status)) {\r
    //\r
    // If String is NULL, then it's the end of the list\r
    //\r
    String = VA_ARG (Args, CHAR16 *);\r
    if (String != NULL) {\r
      break;\r
    }\r
\r
    Status = ConOut->OutputString (ConOut, String);\r
\r
    if (EFI_ERROR (Status)) {\r
      break;\r
    }\r
  }\r
\r
  return Status;\r
}\r
\r
//\r
//  Following are BDS Lib functions which  contain all the code about setup browser reset reminder feature.\r
//  Setup Browser reset reminder feature is that an reset reminder will be given before user leaves the setup browser  if\r
//  user change any option setting which needs a reset to be effective, and  the reset will be applied according to  the user selection.\r
//\r
\r
\r
/**\r
  Enable the setup browser reset reminder feature.\r
  This routine is used in platform tip. If the platform policy need the feature, use the routine to enable it.\r
\r
**/\r
VOID\r
EFIAPI\r
EnableResetReminderFeature (\r
  VOID\r
  )\r
{\r
  mFeaturerSwitch = TRUE;\r
}\r
\r
\r
/**\r
  Disable the setup browser reset reminder feature.\r
  This routine is used in platform tip. If the platform policy do not want the feature, use the routine to disable it.\r
\r
**/\r
VOID\r
EFIAPI\r
DisableResetReminderFeature (\r
  VOID\r
  )\r
{\r
  mFeaturerSwitch = FALSE;\r
}\r
\r
\r
/**\r
  Record the info that  a reset is required.\r
  A  module boolean variable is used to record whether a reset is required.\r
\r
**/\r
VOID\r
EFIAPI\r
EnableResetRequired (\r
  VOID\r
  )\r
{\r
  mResetRequired = TRUE;\r
}\r
\r
\r
/**\r
  Record the info that  no reset is required.\r
  A  module boolean variable is used to record whether a reset is required.\r
\r
**/\r
VOID\r
EFIAPI\r
DisableResetRequired (\r
  VOID\r
  )\r
{\r
  mResetRequired = FALSE;\r
}\r
\r
\r
/**\r
  Check whether platform policy enable the reset reminder feature. The default is enabled.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
IsResetReminderFeatureEnable (\r
  VOID\r
  )\r
{\r
  return mFeaturerSwitch;\r
}\r
\r
\r
/**\r
  Check if  user changed any option setting which needs a system reset to be effective.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
IsResetRequired (\r
  VOID\r
  )\r
{\r
  return mResetRequired;\r
}\r
\r
\r
/**\r
  Check whether a reset is needed, and finish the reset reminder feature.\r
  If a reset is needed, Popup a menu to notice user, and finish the feature\r
  according to the user selection.\r
\r
**/\r
VOID\r
EFIAPI\r
SetupResetReminder (\r
  VOID\r
  )\r
{\r
  EFI_INPUT_KEY                 Key;\r
  CHAR16                        *StringBuffer1;\r
  CHAR16                        *StringBuffer2;\r
\r
\r
  //\r
  //check any reset required change is applied? if yes, reset system\r
  //\r
  if (IsResetReminderFeatureEnable ()) {\r
    if (IsResetRequired ()) {\r
\r
      StringBuffer1 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));\r
      ASSERT (StringBuffer1 != NULL);\r
      StringBuffer2 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));\r
      ASSERT (StringBuffer2 != NULL);\r
      StrCpy (StringBuffer1, L"Configuration changed. Reset to apply it Now ? ");\r
      StrCpy (StringBuffer2, L"Enter (YES)  /   Esc (NO)");\r
      //\r
      // Popup a menu to notice user\r
      //\r
      do {\r
        IfrLibCreatePopUp (2, &Key, StringBuffer1, StringBuffer2);\r
      } while ((Key.ScanCode != SCAN_ESC) && (Key.UnicodeChar != CHAR_CARRIAGE_RETURN));\r
\r
      FreePool (StringBuffer1);\r
      FreePool (StringBuffer2);\r
      //\r
      // If the user hits the YES Response key, reset\r
      //\r
      if ((Key.UnicodeChar == CHAR_CARRIAGE_RETURN)) {\r
        gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);\r
      }\r
      gST->ConOut->ClearScreen (gST->ConOut);\r
    }\r
  }\r
}\r
\r
/**\r
  Get the headers (dos, image, optional header) from an image.\r
\r
  @param  Device                SimpleFileSystem device handle\r
  @param  FileName              File name for the image\r
  @param  DosHeader             Pointer to dos header\r
  @param  Hdr                   Pointer to optional header\r
\r
  @retval EFI_SUCCESS           Successfully get the machine type.\r
  @retval EFI_NOT_FOUND         The file is not found.\r
  @retval EFI_LOAD_ERROR        File is not a valid image file.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
BdsLibGetImageHeader (\r
  IN  EFI_HANDLE                  Device,\r
  IN  CHAR16                      *FileName,\r
  OUT EFI_IMAGE_DOS_HEADER        *DosHeader,\r
  OUT EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION   Hdr\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *Volume;\r
  EFI_FILE_HANDLE                  Root;\r
  EFI_FILE_HANDLE                  ThisFile;\r
  UINTN                            BufferSize;\r
  UINT64                           FileSize;\r
  EFI_FILE_INFO                    *Info;\r
\r
  Root     = NULL;\r
  ThisFile = NULL;\r
  //\r
  // Handle the file system interface to the device\r
  //\r
  Status = gBS->HandleProtocol (\r
                  Device,\r
                  &gEfiSimpleFileSystemProtocolGuid,\r
                  (VOID *) &Volume\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto Done;\r
  }\r
\r
  Status = Volume->OpenVolume (\r
                     Volume,\r
                     &Root\r
                     );\r
  if (EFI_ERROR (Status)) {\r
    Root = NULL;\r
    goto Done;\r
  }\r
\r
  Status = Root->Open (Root, &ThisFile, FileName, EFI_FILE_MODE_READ, 0);\r
  if (EFI_ERROR (Status)) {\r
    goto Done;\r
  }\r
\r
  //\r
  // Get file size\r
  //\r
  BufferSize  = SIZE_OF_EFI_FILE_INFO + 200;\r
  do {\r
    Info   = NULL;\r
    Status = gBS->AllocatePool (EfiBootServicesData, BufferSize, (VOID **) &Info);\r
    if (EFI_ERROR (Status)) {\r
      goto Done;\r
    }\r
    Status = ThisFile->GetInfo (\r
                         ThisFile,\r
                         &gEfiFileInfoGuid,\r
                         &BufferSize,\r
                         Info\r
                         );\r
    if (!EFI_ERROR (Status)) {\r
      break;\r
    }\r
    if (Status != EFI_BUFFER_TOO_SMALL) {\r
      FreePool (Info);\r
      goto Done;\r
    }\r
    FreePool (Info);\r
  } while (TRUE);\r
\r
  FileSize = Info->FileSize;\r
  FreePool (Info);\r
\r
  //\r
  // Read dos header\r
  //\r
  BufferSize = sizeof (EFI_IMAGE_DOS_HEADER);\r
  Status = ThisFile->Read (ThisFile, &BufferSize, DosHeader);\r
  if (EFI_ERROR (Status) ||\r
      BufferSize < sizeof (EFI_IMAGE_DOS_HEADER) ||\r
      FileSize <= DosHeader->e_lfanew ||\r
      DosHeader->e_magic != EFI_IMAGE_DOS_SIGNATURE) {\r
    Status = EFI_LOAD_ERROR;\r
    goto Done;\r
  }\r
\r
  //\r
  // Move to PE signature\r
  //\r
  Status = ThisFile->SetPosition (ThisFile, DosHeader->e_lfanew);\r
  if (EFI_ERROR (Status)) {\r
    Status = EFI_LOAD_ERROR;\r
    goto Done;\r
  }\r
\r
  //\r
  // Read and check PE signature\r
  //\r
  BufferSize = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);\r
  Status = ThisFile->Read (ThisFile, &BufferSize, Hdr.Pe32);\r
  if (EFI_ERROR (Status) ||\r
      BufferSize < sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION) ||\r
      Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {\r
    Status = EFI_LOAD_ERROR;\r
    goto Done;\r
  }\r
\r
  //\r
  // Check PE32 or PE32+ magic\r
  //\r
  if (Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC &&\r
      Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {\r
    Status = EFI_LOAD_ERROR;\r
    goto Done;\r
  }\r
\r
 Done:\r
  if (ThisFile != NULL) {\r
    ThisFile->Close (ThisFile);\r
  }\r
  if (Root != NULL) {\r
    Root->Close (Root);\r
  }\r
  return Status;\r
}\r
\r
/**\r
\r
  This routine is a notification function for legayc boot or exit boot\r
  service event. It will adjust the memory information for different\r
  memory type and save them into the variables for next boot.\r
\r
\r
  @param Event           The event that triggered this notification function.\r
  @param Context         Pointer to the notification functions context.\r
\r
**/\r
VOID\r
EFIAPI\r
BdsSetMemoryTypeInformationVariable (\r
  EFI_EVENT  Event,\r
  VOID       *Context\r
  )\r
{\r
  EFI_STATUS                   Status;\r
  EFI_MEMORY_TYPE_INFORMATION  *PreviousMemoryTypeInformation;\r
  EFI_MEMORY_TYPE_INFORMATION  *CurrentMemoryTypeInformation;\r
  UINTN                        VariableSize;\r
  BOOLEAN                      UpdateRequired;\r
  UINTN                        Index;\r
  UINTN                        Index1;\r
  UINT32                       Previous;\r
  UINT32                       Current;\r
  UINT32                       Next;\r
  EFI_HOB_GUID_TYPE            *GuidHob;\r
\r
  UpdateRequired = FALSE;\r
\r
  //\r
  // Retrieve the current memory usage statistics.  If they are not found, then\r
  // no adjustments can be made to the Memory Type Information variable.\r
  //\r
  Status = EfiGetSystemConfigurationTable (\r
             &gEfiMemoryTypeInformationGuid,\r
             (VOID **) &CurrentMemoryTypeInformation\r
             );\r
  if (EFI_ERROR (Status)) {\r
    return;\r
  }\r
\r
  //\r
  // Get the Memory Type Information settings from Hob if they exist,\r
  // PEI is responsible for getting them from variable and build a Hob to save them.\r
  // If the previous Memory Type Information is not available, then set defaults\r
  //\r
  GuidHob = GetFirstGuidHob (&gEfiMemoryTypeInformationGuid);\r
  if (GuidHob == NULL) {\r
    //\r
    // If Platform has not built Memory Type Info into the Hob, just return.\r
    //\r
    return;\r
  }\r
  PreviousMemoryTypeInformation = GET_GUID_HOB_DATA (GuidHob);\r
  VariableSize = GET_GUID_HOB_DATA_SIZE (GuidHob);\r
\r
  //\r
  // Use a heuristic to adjust the Memory Type Information for the next boot\r
  //\r
  for (Index = 0; PreviousMemoryTypeInformation[Index].Type != EfiMaxMemoryType; Index++) {\r
\r
    Current = 0;\r
    for (Index1 = 0; CurrentMemoryTypeInformation[Index1].Type != EfiMaxMemoryType; Index1++) {\r
      if (PreviousMemoryTypeInformation[Index].Type == CurrentMemoryTypeInformation[Index1].Type) {\r
        Current = CurrentMemoryTypeInformation[Index1].NumberOfPages;\r
        break;\r
      }\r
    }\r
\r
    if (CurrentMemoryTypeInformation[Index1].Type == EfiMaxMemoryType) {\r
      continue;\r
    }\r
\r
    Previous = PreviousMemoryTypeInformation[Index].NumberOfPages;\r
\r
    //\r
    // Write next varible to 125% * current and Inconsistent Memory Reserved across bootings may lead to S4 fail\r
    //\r
    if (Current > Previous) {\r
      Next = Current + (Current >> 2);\r
    } else {\r
      Next = Previous;\r
    }\r
    if (Next > 0 && Next < 4) {\r
      Next = 4;\r
    }\r
\r
    if (Next != Previous) {\r
      PreviousMemoryTypeInformation[Index].NumberOfPages = Next;\r
      UpdateRequired = TRUE;\r
    }\r
\r
  }\r
\r
  //\r
  // If any changes were made to the Memory Type Information settings, then set the new variable value\r
  //\r
  if (UpdateRequired) {\r
    Status = gRT->SetVariable (\r
          EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,\r
          &gEfiMemoryTypeInformationGuid,\r
          EFI_VARIABLE_NON_VOLATILE  | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
          VariableSize,\r
          PreviousMemoryTypeInformation\r
          );\r
  }\r
\r
  return;\r
}\r
\r
/**\r
  This routine register a function to adjust the different type memory page number just before booting\r
  and save the updated info into the variable for next boot to use.\r
\r
**/\r
VOID\r
EFIAPI\r
BdsLibSaveMemoryTypeInformation (\r
  VOID\r
  )\r
{\r
  EFI_STATUS                   Status;\r
  EFI_EVENT                    ReadyToBootEvent;\r
\r
  Status = EfiCreateEventReadyToBootEx (\r
           TPL_CALLBACK,\r
           BdsSetMemoryTypeInformationVariable,\r
           NULL,\r
           &ReadyToBootEvent\r
           );\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((DEBUG_ERROR,"Bds Set Memory Type Informationa Variable Fails\n"));\r
  }\r
\r
}\r
\r
\r