EdkCompatibilityPkg/Compatibility/FvOnFv2Thunk/FvOnFv2Thunk.c - edk2 - Git at Google

 /** @file
 UEFI PI specification supersedes Inte's Framework Specification.
 EFI_FIRMWARE_VOLUME_PROTOCOL defined in Intel Framework Pkg is replaced by
 EFI_FIRMWARE_VOLUME2_PROTOCOL in MdePkg.
 This module produces FV on top of FV2. This module is used on platform when both of
 these two conditions are true:
 1) Framework module consuming FV is present
 2) And the platform only produces FV2

 Copyright (c) 2006 - 2010, 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.
 Module Name:

 **/

 #include <PiDxe.h>
 #include <Protocol/FirmwareVolume2.h>
 #include <Protocol/FirmwareVolume.h>
 #include <Library/BaseLib.h>
 #include <Library/DebugLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiDriverEntryPoint.h>
 #include <Library/UefiLib.h>
 #include <Library/MemoryAllocationLib.h>

 #define FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE  SIGNATURE_32 ('f', 'v', 't', 'h')

 typedef struct {
   UINTN                          Signature;
   EFI_FIRMWARE_VOLUME_PROTOCOL   FirmwareVolume;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;
 } FIRMWARE_VOLUME_PRIVATE_DATA;

 #define FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS(a) CR (a, FIRMWARE_VOLUME_PRIVATE_DATA, FirmwareVolume, FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE)

 /**
   Convert FV attrbiutes to FV2 attributes.

   @param Fv2Attributes FV2 attributes.

   @return FV attributes.

 **/
 FRAMEWORK_EFI_FV_ATTRIBUTES
 Fv2AttributesToFvAttributes (
   IN  EFI_FV_ATTRIBUTES Fv2Attributes
   )
 {
   //
   // Clear those filed that is not defined in Framework FV spec and Alignment conversion.
   //
   return (Fv2Attributes & 0x1ff) | ((UINTN) EFI_FV_ALIGNMENT_2 << RShiftU64((Fv2Attributes & EFI_FV2_ALIGNMENT), 16));
 }

 /**
   Retrieves attributes, insures positive polarity of attribute bits, returns
   resulting attributes in output parameter.

   @param  This                  Calling context
   @param  Attributes            output buffer which contains attributes

   @retval EFI_SUCCESS           The firmware volume attributes were returned.

 **/
 EFI_STATUS
 EFIAPI
 FvGetVolumeAttributes (
   IN  EFI_FIRMWARE_VOLUME_PROTOCOL  *This,
   OUT FRAMEWORK_EFI_FV_ATTRIBUTES   *Attributes
   )
 {
   EFI_STATUS                     Status;
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   Status = FirmwareVolume2->GetVolumeAttributes (
                               FirmwareVolume2,
                               Attributes
                               );
   if (!EFI_ERROR (Status)) {
     *Attributes = Fv2AttributesToFvAttributes (*Attributes);
   }
   return Status;
 }

 /**
   Sets volume attributes.

   @param  This                  Calling context
   @param  Attributes            Buffer which contains attributes

   @retval EFI_INVALID_PARAMETER A bit in Attributes was invalid
   @retval EFI_SUCCESS           The requested firmware volume attributes were set
                                 and the resulting EFI_FV_ATTRIBUTES is returned in
                                 Attributes.
   @retval EFI_ACCESS_DENIED     The Device is locked and does not permit modification.

 **/
 EFI_STATUS
 EFIAPI
 FvSetVolumeAttributes (
   IN EFI_FIRMWARE_VOLUME_PROTOCOL     *This,
   IN OUT FRAMEWORK_EFI_FV_ATTRIBUTES  *Attributes
   )
 {
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;
   EFI_FV_ATTRIBUTES              Fv2Attributes;
   EFI_STATUS                     Status;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   Fv2Attributes = (*Attributes & 0x1ff);
   Status = FirmwareVolume2->SetVolumeAttributes (
                             FirmwareVolume2,
                             &Fv2Attributes
                             );

   *Attributes = Fv2AttributesToFvAttributes (Fv2Attributes);

   return Status;
 }

 /**
   Read the requested file (NameGuid) and returns data in Buffer.

   @param  This                  Calling context
   @param  NameGuid              Filename identifying which file to read
   @param  Buffer                Pointer to pointer to buffer in which contents of file are returned.
                                 <br>
                                 If Buffer is NULL, only type, attributes, and size are returned as
                                 there is no output buffer.
                                 <br>
                                 If Buffer != NULL and *Buffer == NULL, the output buffer is allocated
                                 from BS pool by ReadFile
                                 <br>
                                 If Buffer != NULL and *Buffer != NULL, the output buffer has been
                                 allocated by the caller and is being passed in.
   @param  BufferSize            Indicates the buffer size passed in, and on output the size
                                 required to complete the read
   @param  FoundType             Indicates the type of the file who's data is returned
   @param  FileAttributes        Indicates the attributes of the file who's data is resturned
   @param  AuthenticationStatus  Indicates the authentication status of the data

   @retval EFI_SUCCESS               The call completed successfully
   @retval EFI_WARN_BUFFER_TOO_SMALL The buffer is too small to contain the requested output.
                                     The buffer is filled and the output is truncated.
   @retval EFI_NOT_FOUND             NameGuid was not found in the firmware volume.
   @retval EFI_DEVICE_ERROR          A hardware error occurred when attempting to access the firmware volume.
   @retval EFI_ACCESS_DENIED         The firmware volume is configured to disallow reads.
   @retval EFI_OUT_OF_RESOURCES      An allocation failure occurred.

 **/
 EFI_STATUS
 EFIAPI
 FvReadFile (
   IN EFI_FIRMWARE_VOLUME_PROTOCOL   *This,
   IN EFI_GUID                       *NameGuid,
   IN OUT VOID                       **Buffer,
   IN OUT UINTN                      *BufferSize,
   OUT EFI_FV_FILETYPE               *FoundType,
   OUT EFI_FV_FILE_ATTRIBUTES        *FileAttributes,
   OUT UINT32                        *AuthenticationStatus
   )
 {
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;
   EFI_STATUS                     Status;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   Status = FirmwareVolume2->ReadFile (
                             FirmwareVolume2,
                             NameGuid,
                             Buffer,
                             BufferSize,
                             FoundType,
                             FileAttributes,
                             AuthenticationStatus
                             );

   //
   // For Framework FV attrbutes, only alignment fields are valid.
   //
   *FileAttributes = *FileAttributes & EFI_FV_FILE_ATTRIB_ALIGNMENT;

   return Status;
 }

 /**
   Read the requested section from the specified file and returns data in Buffer.

   @param  This                  Calling context
   @param  NameGuid              Filename identifying the file from which to read
   @param  SectionType           Indicates what section type to retrieve
   @param  SectionInstance       Indicates which instance of SectionType to retrieve
   @param  Buffer                Pointer to pointer to buffer in which contents of file are returned.
                                 <br>
                                 If Buffer is NULL, only type, attributes, and size are returned as
                                 there is no output buffer.
                                 <br>
                                 If Buffer != NULL and *Buffer == NULL, the output buffer is allocated
                                 from BS pool by ReadFile
                                 <br>
                                 If Buffer != NULL and *Buffer != NULL, the output buffer has been
                                 allocated by the caller and is being passed in.
   @param  BufferSize            Indicates the buffer size passed in, and on output the size
                                 required to complete the read
   @param  AuthenticationStatus  Indicates the authentication status of the data

   @retval EFI_SUCCESS                The call completed successfully.
   @retval EFI_WARN_BUFFER_TOO_SMALL  The buffer is too small to contain the requested output.
                                      The buffer is filled and the output is truncated.
   @retval EFI_OUT_OF_RESOURCES       An allocation failure occurred.
   @retval EFI_NOT_FOUND              Name was not found in the firmware volume.
   @retval EFI_DEVICE_ERROR           A hardware error occurred when attempting to access the firmware volume.
   @retval EFI_ACCESS_DENIED          The firmware volume is configured to disallow reads.

 **/
 EFI_STATUS
 EFIAPI
 FvReadSection (
   IN EFI_FIRMWARE_VOLUME_PROTOCOL   *This,
   IN EFI_GUID                       *NameGuid,
   IN EFI_SECTION_TYPE               SectionType,
   IN UINTN                          SectionInstance,
   IN OUT VOID                       **Buffer,
   IN OUT UINTN                      *BufferSize,
   OUT UINT32                        *AuthenticationStatus
   )
 {
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   return FirmwareVolume2->ReadSection (
                             FirmwareVolume2,
                             NameGuid,
                             SectionType,
                             SectionInstance,
                             Buffer,
                             BufferSize,
                             AuthenticationStatus
                             );
 }

 /**
   Write the supplied file (NameGuid) to the FV.

   @param  This                  Calling context
   @param  NumberOfFiles         Indicates the number of file records pointed to by FileData
   @param  WritePolicy           Indicates the level of reliability of the write with respect to
                                 things like power failure events.
   @param  FileData              A pointer to an array of EFI_FV_WRITE_FILE_DATA structures. Each
                                 element in the array indicates a file to write, and there are
                                 NumberOfFiles elements in the input array.

   @retval EFI_SUCCESS           The write completed successfully.
   @retval EFI_OUT_OF_RESOURCES  The firmware volume does not have enough free space to store file(s).
   @retval EFI_DEVICE_ERROR      A hardware error occurred when attempting to access the firmware volume.
   @retval EFI_WRITE_PROTECTED   The firmware volume is configured to disallow writes.
   @retval EFI_NOT_FOUND         A delete was requested, but the requested file was not
                                 found in the firmware volume.
   @retval EFI_INVALID_PARAMETER A delete was requested with a multiple file write.
                                 An unsupported WritePolicy was requested.
                                 An unknown file type was specified.
                                 A file system specific error has occurred.

 **/
 EFI_STATUS
 EFIAPI
 FvWriteFile (
   IN EFI_FIRMWARE_VOLUME_PROTOCOL      *This,
   IN UINT32                            NumberOfFiles,
   IN FRAMEWORK_EFI_FV_WRITE_POLICY     WritePolicy,
   IN FRAMEWORK_EFI_FV_WRITE_FILE_DATA  *FileData
   )
 {
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;
   EFI_FV_WRITE_FILE_DATA         *PiFileData;
   EFI_STATUS                     Status;
   UINTN                          Index;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   PiFileData = AllocateCopyPool (sizeof (EFI_FV_WRITE_FILE_DATA), FileData);
   ASSERT (PiFileData != NULL);

   //
   // Framework Spec assume firmware files are Memory-Mapped.
   //
   for (Index = 0; Index < NumberOfFiles; Index++) {
     PiFileData[Index].FileAttributes |= EFI_FV_FILE_ATTRIB_MEMORY_MAPPED;
   }

   Status = FirmwareVolume2->WriteFile (
                             FirmwareVolume2,
                             NumberOfFiles,
                             WritePolicy,
                             (EFI_FV_WRITE_FILE_DATA *)FileData
                             );

   FreePool (PiFileData);
   return Status;
 }

 /**
   Given the input key, search for the next matching file in the volume.

   @param  This                  Calling context
   @param  Key                   Pointer to a caller allocated buffer that contains an implementation
                                 specific key that is used to track where to begin searching on
                                 successive calls.
   @param  FileType              Indicates the file type to filter for
   @param  NameGuid              Guid filename of the file found
   @param  Attributes            Attributes of the file found
   @param  Size                  Size in bytes of the file found

   @retval EFI_SUCCESS           The output parameters are filled with data obtained from
                                 the first matching file that was found.
   @retval EFI_NOT_FOUND         No files of type FileType were found.
   @retval EFI_DEVICE_ERROR      A hardware error occurred when attempting to access
                                 the firmware volume.
   @retval EFI_ACCESS_DENIED     The firmware volume is configured to disallow reads.

 **/
 EFI_STATUS
 EFIAPI
 FvGetNextFile (
   IN EFI_FIRMWARE_VOLUME_PROTOCOL   *This,
   IN OUT VOID                       *Key,
   IN OUT EFI_FV_FILETYPE            *FileType,
   OUT EFI_GUID                      *NameGuid,
   OUT EFI_FV_FILE_ATTRIBUTES        *Attributes,
   OUT UINTN                         *Size
   )
 {
   FIRMWARE_VOLUME_PRIVATE_DATA   *Private;
   EFI_FIRMWARE_VOLUME2_PROTOCOL  *FirmwareVolume2;
   EFI_STATUS                     Status;

   Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
   FirmwareVolume2 = Private->FirmwareVolume2;

   Status = FirmwareVolume2->GetNextFile (
                             FirmwareVolume2,
                             Key,
                             FileType,
                             NameGuid,
                             Attributes,
                             Size
                             );

   //
   // For Framework FV attrbutes, only alignment fields are valid.
   //
   *Attributes = *Attributes & EFI_FV_FILE_ATTRIB_ALIGNMENT;

   return Status;
 }

 //
 // Firmware Volume Protocol template
 //
 EFI_EVENT  mFvRegistration;

 FIRMWARE_VOLUME_PRIVATE_DATA gFirmwareVolumePrivateDataTemplate = {
   FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE,
   {
     FvGetVolumeAttributes,
     FvSetVolumeAttributes,
     FvReadFile,
     FvReadSection,
     FvWriteFile,
     FvGetNextFile,
     0,
     NULL
   },
   NULL
 };

 //
 // Module globals
 //
 /**
   This notification function is invoked when an instance of the
   EFI_FIRMWARE_VOLUME2_PROTOCOL is produced. It installs another instance of the
   EFI_FIRMWARE_VOLUME_PROTOCOL on the same handle.

   @param  Event                 The event that occured
   @param  Context               Context of event. Not used in this nofication function.

 **/
 VOID
 EFIAPI
 FvNotificationEvent (
   IN  EFI_EVENT       Event,
   IN  VOID            *Context
   )
 {
   EFI_STATUS                    Status;
   UINTN                         BufferSize;
   EFI_HANDLE                    Handle;
   FIRMWARE_VOLUME_PRIVATE_DATA  *Private;
   EFI_FIRMWARE_VOLUME_PROTOCOL  *FirmwareVolume;

   while (TRUE) {
     BufferSize = sizeof (Handle);
     Status = gBS->LocateHandle (
                     ByRegisterNotify,
                     &gEfiFirmwareVolume2ProtocolGuid,
                     mFvRegistration,
                     &BufferSize,
                     &Handle
                     );
     if (EFI_ERROR (Status)) {
       //
       // Exit Path of While Loop....
       //
       break;
     }

     //
     // Skip this handle if the Firmware Volume Protocol is already installed
     //
     Status = gBS->HandleProtocol (
                     Handle,
                     &gEfiFirmwareVolumeProtocolGuid,
                     (VOID **)&FirmwareVolume
                     );
     if (!EFI_ERROR (Status)) {
       continue;
     }

     //
     // Allocate private data structure
     //
     Private = AllocateCopyPool (sizeof (FIRMWARE_VOLUME_PRIVATE_DATA), &gFirmwareVolumePrivateDataTemplate);
     if (Private == NULL) {
       continue;
     }

     //
     // Retrieve the Firmware Volume2 Protocol
     //
     Status = gBS->HandleProtocol (
                     Handle,
                     &gEfiFirmwareVolume2ProtocolGuid,
                     (VOID **)&Private->FirmwareVolume2
                     );
     ASSERT_EFI_ERROR (Status);

     //
     // Fill in rest of private data structure
     //
     Private->FirmwareVolume.KeySize      = Private->FirmwareVolume2->KeySize;
     Private->FirmwareVolume.ParentHandle = Private->FirmwareVolume2->ParentHandle;

     //
     // Install Firmware Volume Protocol onto same handle
     //
     Status = gBS->InstallMultipleProtocolInterfaces (
                     &Handle,
                     &gEfiFirmwareVolumeProtocolGuid,
                     &Private->FirmwareVolume,
                     NULL
                     );
     ASSERT_EFI_ERROR (Status);
   }
 }


 /**
   The user Entry Point for DXE driver. The user code starts with this function
   as the real entry point for the image goes into a library that calls this
   function.

   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
   @param[in] SystemTable    A pointer to the EFI System Table.

   @retval EFI_SUCCESS       The entry point is executed successfully.
   @retval other             Some error occurs when executing this entry point.

 **/
 EFI_STATUS
 EFIAPI
 InitializeFirmwareVolume2 (
   IN EFI_HANDLE        ImageHandle,
   IN EFI_SYSTEM_TABLE  *SystemTable
   )
 {
   EfiCreateProtocolNotifyEvent (
     &gEfiFirmwareVolume2ProtocolGuid,
     TPL_CALLBACK,
     FvNotificationEvent,
     NULL,
     &mFvRegistration
     );
   return EFI_SUCCESS;
 }
	/** @file
	UEFI PI specification supersedes Inte's Framework Specification.
	EFI_FIRMWARE_VOLUME_PROTOCOL defined in Intel Framework Pkg is replaced by
	EFI_FIRMWARE_VOLUME2_PROTOCOL in MdePkg.
	This module produces FV on top of FV2. This module is used on platform when both of
	these two conditions are true:
	1) Framework module consuming FV is present
	2) And the platform only produces FV2

	Copyright (c) 2006 - 2010, 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.
	Module Name:

	**/

	#include <PiDxe.h>
	#include <Protocol/FirmwareVolume2.h>
	#include <Protocol/FirmwareVolume.h>
	#include <Library/BaseLib.h>
	#include <Library/DebugLib.h>
	#include <Library/UefiBootServicesTableLib.h>
	#include <Library/UefiDriverEntryPoint.h>
	#include <Library/UefiLib.h>
	#include <Library/MemoryAllocationLib.h>

	#define FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('f', 'v', 't', 'h')

	typedef struct {
	UINTN Signature;
	EFI_FIRMWARE_VOLUME_PROTOCOL FirmwareVolume;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;
	} FIRMWARE_VOLUME_PRIVATE_DATA;

	#define FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS(a) CR (a, FIRMWARE_VOLUME_PRIVATE_DATA, FirmwareVolume, FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE)

	/**
	Convert FV attrbiutes to FV2 attributes.

	@param Fv2Attributes FV2 attributes.

	@return FV attributes.

	**/
	FRAMEWORK_EFI_FV_ATTRIBUTES
	Fv2AttributesToFvAttributes (
	IN EFI_FV_ATTRIBUTES Fv2Attributes
	)
	{
	//
	// Clear those filed that is not defined in Framework FV spec and Alignment conversion.
	//
	return (Fv2Attributes & 0x1ff) \| ((UINTN) EFI_FV_ALIGNMENT_2 << RShiftU64((Fv2Attributes & EFI_FV2_ALIGNMENT), 16));
	}

	/**
	Retrieves attributes, insures positive polarity of attribute bits, returns
	resulting attributes in output parameter.

	@param This Calling context
	@param Attributes output buffer which contains attributes

	@retval EFI_SUCCESS The firmware volume attributes were returned.

	**/
	EFI_STATUS
	EFIAPI
	FvGetVolumeAttributes (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	OUT FRAMEWORK_EFI_FV_ATTRIBUTES *Attributes
	)
	{
	EFI_STATUS Status;
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	Status = FirmwareVolume2->GetVolumeAttributes (
	FirmwareVolume2,
	Attributes
	);
	if (!EFI_ERROR (Status)) {
	Attributes = Fv2AttributesToFvAttributes (Attributes);
	}
	return Status;
	}

	/**
	Sets volume attributes.

	@param This Calling context
	@param Attributes Buffer which contains attributes

	@retval EFI_INVALID_PARAMETER A bit in Attributes was invalid
	@retval EFI_SUCCESS The requested firmware volume attributes were set
	and the resulting EFI_FV_ATTRIBUTES is returned in
	Attributes.
	@retval EFI_ACCESS_DENIED The Device is locked and does not permit modification.

	**/
	EFI_STATUS
	EFIAPI
	FvSetVolumeAttributes (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	IN OUT FRAMEWORK_EFI_FV_ATTRIBUTES *Attributes
	)
	{
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;
	EFI_FV_ATTRIBUTES Fv2Attributes;
	EFI_STATUS Status;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	Fv2Attributes = (*Attributes & 0x1ff);
	Status = FirmwareVolume2->SetVolumeAttributes (
	FirmwareVolume2,
	&Fv2Attributes
	);

	*Attributes = Fv2AttributesToFvAttributes (Fv2Attributes);

	return Status;
	}

	/**
	Read the requested file (NameGuid) and returns data in Buffer.

	@param This Calling context
	@param NameGuid Filename identifying which file to read
	@param Buffer Pointer to pointer to buffer in which contents of file are returned.
	<br>
	If Buffer is NULL, only type, attributes, and size are returned as
	there is no output buffer.
	<br>
	If Buffer != NULL and *Buffer == NULL, the output buffer is allocated
	from BS pool by ReadFile
	<br>
	If Buffer != NULL and *Buffer != NULL, the output buffer has been
	allocated by the caller and is being passed in.
	@param BufferSize Indicates the buffer size passed in, and on output the size
	required to complete the read
	@param FoundType Indicates the type of the file who's data is returned
	@param FileAttributes Indicates the attributes of the file who's data is resturned
	@param AuthenticationStatus Indicates the authentication status of the data

	@retval EFI_SUCCESS The call completed successfully
	@retval EFI_WARN_BUFFER_TOO_SMALL The buffer is too small to contain the requested output.
	The buffer is filled and the output is truncated.
	@retval EFI_NOT_FOUND NameGuid was not found in the firmware volume.
	@retval EFI_DEVICE_ERROR A hardware error occurred when attempting to access the firmware volume.
	@retval EFI_ACCESS_DENIED The firmware volume is configured to disallow reads.
	@retval EFI_OUT_OF_RESOURCES An allocation failure occurred.

	**/
	EFI_STATUS
	EFIAPI
	FvReadFile (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	IN EFI_GUID *NameGuid,
	IN OUT VOID **Buffer,
	IN OUT UINTN *BufferSize,
	OUT EFI_FV_FILETYPE *FoundType,
	OUT EFI_FV_FILE_ATTRIBUTES *FileAttributes,
	OUT UINT32 *AuthenticationStatus
	)
	{
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;
	EFI_STATUS Status;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	Status = FirmwareVolume2->ReadFile (
	FirmwareVolume2,
	NameGuid,
	Buffer,
	BufferSize,
	FoundType,
	FileAttributes,
	AuthenticationStatus
	);

	//
	// For Framework FV attrbutes, only alignment fields are valid.
	//
	FileAttributes = FileAttributes & EFI_FV_FILE_ATTRIB_ALIGNMENT;

	return Status;
	}

	/**
	Read the requested section from the specified file and returns data in Buffer.

	@param This Calling context
	@param NameGuid Filename identifying the file from which to read
	@param SectionType Indicates what section type to retrieve
	@param SectionInstance Indicates which instance of SectionType to retrieve
	@param Buffer Pointer to pointer to buffer in which contents of file are returned.
	<br>
	If Buffer is NULL, only type, attributes, and size are returned as
	there is no output buffer.
	<br>
	If Buffer != NULL and *Buffer == NULL, the output buffer is allocated
	from BS pool by ReadFile
	<br>
	If Buffer != NULL and *Buffer != NULL, the output buffer has been
	allocated by the caller and is being passed in.
	@param BufferSize Indicates the buffer size passed in, and on output the size
	required to complete the read
	@param AuthenticationStatus Indicates the authentication status of the data

	@retval EFI_SUCCESS The call completed successfully.
	@retval EFI_WARN_BUFFER_TOO_SMALL The buffer is too small to contain the requested output.
	The buffer is filled and the output is truncated.
	@retval EFI_OUT_OF_RESOURCES An allocation failure occurred.
	@retval EFI_NOT_FOUND Name was not found in the firmware volume.
	@retval EFI_DEVICE_ERROR A hardware error occurred when attempting to access the firmware volume.
	@retval EFI_ACCESS_DENIED The firmware volume is configured to disallow reads.

	**/
	EFI_STATUS
	EFIAPI
	FvReadSection (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	IN EFI_GUID *NameGuid,
	IN EFI_SECTION_TYPE SectionType,
	IN UINTN SectionInstance,
	IN OUT VOID **Buffer,
	IN OUT UINTN *BufferSize,
	OUT UINT32 *AuthenticationStatus
	)
	{
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	return FirmwareVolume2->ReadSection (
	FirmwareVolume2,
	NameGuid,
	SectionType,
	SectionInstance,
	Buffer,
	BufferSize,
	AuthenticationStatus
	);
	}

	/**
	Write the supplied file (NameGuid) to the FV.

	@param This Calling context
	@param NumberOfFiles Indicates the number of file records pointed to by FileData
	@param WritePolicy Indicates the level of reliability of the write with respect to
	things like power failure events.
	@param FileData A pointer to an array of EFI_FV_WRITE_FILE_DATA structures. Each
	element in the array indicates a file to write, and there are
	NumberOfFiles elements in the input array.

	@retval EFI_SUCCESS The write completed successfully.
	@retval EFI_OUT_OF_RESOURCES The firmware volume does not have enough free space to store file(s).
	@retval EFI_DEVICE_ERROR A hardware error occurred when attempting to access the firmware volume.
	@retval EFI_WRITE_PROTECTED The firmware volume is configured to disallow writes.
	@retval EFI_NOT_FOUND A delete was requested, but the requested file was not
	found in the firmware volume.
	@retval EFI_INVALID_PARAMETER A delete was requested with a multiple file write.
	An unsupported WritePolicy was requested.
	An unknown file type was specified.
	A file system specific error has occurred.

	**/
	EFI_STATUS
	EFIAPI
	FvWriteFile (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	IN UINT32 NumberOfFiles,
	IN FRAMEWORK_EFI_FV_WRITE_POLICY WritePolicy,
	IN FRAMEWORK_EFI_FV_WRITE_FILE_DATA *FileData
	)
	{
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;
	EFI_FV_WRITE_FILE_DATA *PiFileData;
	EFI_STATUS Status;
	UINTN Index;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	PiFileData = AllocateCopyPool (sizeof (EFI_FV_WRITE_FILE_DATA), FileData);
	ASSERT (PiFileData != NULL);

	//
	// Framework Spec assume firmware files are Memory-Mapped.
	//
	for (Index = 0; Index < NumberOfFiles; Index++) {
	PiFileData[Index].FileAttributes \|= EFI_FV_FILE_ATTRIB_MEMORY_MAPPED;
	}

	Status = FirmwareVolume2->WriteFile (
	FirmwareVolume2,
	NumberOfFiles,
	WritePolicy,
	(EFI_FV_WRITE_FILE_DATA *)FileData
	);

	FreePool (PiFileData);
	return Status;
	}

	/**
	Given the input key, search for the next matching file in the volume.

	@param This Calling context
	@param Key Pointer to a caller allocated buffer that contains an implementation
	specific key that is used to track where to begin searching on
	successive calls.
	@param FileType Indicates the file type to filter for
	@param NameGuid Guid filename of the file found
	@param Attributes Attributes of the file found
	@param Size Size in bytes of the file found

	@retval EFI_SUCCESS The output parameters are filled with data obtained from
	the first matching file that was found.
	@retval EFI_NOT_FOUND No files of type FileType were found.
	@retval EFI_DEVICE_ERROR A hardware error occurred when attempting to access
	the firmware volume.
	@retval EFI_ACCESS_DENIED The firmware volume is configured to disallow reads.

	**/
	EFI_STATUS
	EFIAPI
	FvGetNextFile (
	IN EFI_FIRMWARE_VOLUME_PROTOCOL *This,
	IN OUT VOID *Key,
	IN OUT EFI_FV_FILETYPE *FileType,
	OUT EFI_GUID *NameGuid,
	OUT EFI_FV_FILE_ATTRIBUTES *Attributes,
	OUT UINTN *Size
	)
	{
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME2_PROTOCOL *FirmwareVolume2;
	EFI_STATUS Status;

	Private = FIRMWARE_VOLUME_PRIVATE_DATA_FROM_THIS (This);
	FirmwareVolume2 = Private->FirmwareVolume2;

	Status = FirmwareVolume2->GetNextFile (
	FirmwareVolume2,
	Key,
	FileType,
	NameGuid,
	Attributes,
	Size
	);

	//
	// For Framework FV attrbutes, only alignment fields are valid.
	//
	Attributes = Attributes & EFI_FV_FILE_ATTRIB_ALIGNMENT;

	return Status;
	}

	//
	// Firmware Volume Protocol template
	//
	EFI_EVENT mFvRegistration;

	FIRMWARE_VOLUME_PRIVATE_DATA gFirmwareVolumePrivateDataTemplate = {
	FIRMWARE_VOLUME_PRIVATE_DATA_SIGNATURE,
	{
	FvGetVolumeAttributes,
	FvSetVolumeAttributes,
	FvReadFile,
	FvReadSection,
	FvWriteFile,
	FvGetNextFile,
	0,
	NULL
	},
	NULL
	};

	//
	// Module globals
	//
	/**
	This notification function is invoked when an instance of the
	EFI_FIRMWARE_VOLUME2_PROTOCOL is produced. It installs another instance of the
	EFI_FIRMWARE_VOLUME_PROTOCOL on the same handle.

	@param Event The event that occured
	@param Context Context of event. Not used in this nofication function.

	**/
	VOID
	EFIAPI
	FvNotificationEvent (
	IN EFI_EVENT Event,
	IN VOID *Context
	)
	{
	EFI_STATUS Status;
	UINTN BufferSize;
	EFI_HANDLE Handle;
	FIRMWARE_VOLUME_PRIVATE_DATA *Private;
	EFI_FIRMWARE_VOLUME_PROTOCOL *FirmwareVolume;

	while (TRUE) {
	BufferSize = sizeof (Handle);
	Status = gBS->LocateHandle (
	ByRegisterNotify,
	&gEfiFirmwareVolume2ProtocolGuid,
	mFvRegistration,
	&BufferSize,
	&Handle
	);
	if (EFI_ERROR (Status)) {
	//
	// Exit Path of While Loop....
	//
	break;
	}

	//
	// Skip this handle if the Firmware Volume Protocol is already installed
	//
	Status = gBS->HandleProtocol (
	Handle,
	&gEfiFirmwareVolumeProtocolGuid,
	(VOID **)&FirmwareVolume
	);
	if (!EFI_ERROR (Status)) {
	continue;
	}

	//
	// Allocate private data structure
	//
	Private = AllocateCopyPool (sizeof (FIRMWARE_VOLUME_PRIVATE_DATA), &gFirmwareVolumePrivateDataTemplate);
	if (Private == NULL) {
	continue;
	}

	//
	// Retrieve the Firmware Volume2 Protocol
	//
	Status = gBS->HandleProtocol (
	Handle,
	&gEfiFirmwareVolume2ProtocolGuid,
	(VOID **)&Private->FirmwareVolume2
	);
	ASSERT_EFI_ERROR (Status);

	//
	// Fill in rest of private data structure
	//
	Private->FirmwareVolume.KeySize = Private->FirmwareVolume2->KeySize;
	Private->FirmwareVolume.ParentHandle = Private->FirmwareVolume2->ParentHandle;

	//
	// Install Firmware Volume Protocol onto same handle
	//
	Status = gBS->InstallMultipleProtocolInterfaces (
	&Handle,
	&gEfiFirmwareVolumeProtocolGuid,
	&Private->FirmwareVolume,
	NULL
	);
	ASSERT_EFI_ERROR (Status);
	}
	}


	/**
	The user Entry Point for DXE driver. The user code starts with this function
	as the real entry point for the image goes into a library that calls this
	function.

	@param[in] ImageHandle The firmware allocated handle for the EFI image.
	@param[in] SystemTable A pointer to the EFI System Table.

	@retval EFI_SUCCESS The entry point is executed successfully.
	@retval other Some error occurs when executing this entry point.

	**/
	EFI_STATUS
	EFIAPI
	InitializeFirmwareVolume2 (
	IN EFI_HANDLE ImageHandle,
	IN EFI_SYSTEM_TABLE *SystemTable
	)
	{
	EfiCreateProtocolNotifyEvent (
	&gEfiFirmwareVolume2ProtocolGuid,
	TPL_CALLBACK,
	FvNotificationEvent,
	NULL,
	&mFvRegistration
	);
	return EFI_SUCCESS;
	}