Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c

/** @file
  Firmware Volume Block Driver for Lakeport Platform.

  Firmware volume block driver for FWH or SPI device.
  It depends on which Flash Device Library to be linked with this driver.

Copyright (c) 2006  - 2014, Intel Corporation. All rights reserved.<BR>

  This program and the accompanying materials are licensed and made available under
  the terms and conditions of the BSD License that accompanies this distribution.
  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.


**/

#include "FvbService.h"

//
// Global variable for this FVB driver  which contains
// the private data of all firmware volume block instances.
//
FWB_GLOBAL   mFvbModuleGlobal;

//
// This platform driver knows there are 3 FVs on
// FD, which are FvRecovery, FvMain and FvNvStorage.
//
UINT32 mPlatformFvBaseAddress[] = {
  FixedPcdGet32(PcdFlashNvStorageVariableBase),
};

FV_MEMMAP_DEVICE_PATH mFvMemmapDevicePathTemplate = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_MEMMAP_DP,
      {
        (UINT8)(sizeof (MEMMAP_DEVICE_PATH)),
        (UINT8)(sizeof (MEMMAP_DEVICE_PATH) >> 8)
      }
    },
    EfiMemoryMappedIO,
    (EFI_PHYSICAL_ADDRESS) 0,
    (EFI_PHYSICAL_ADDRESS) 0,
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    {
      END_DEVICE_PATH_LENGTH,
      0
    }
  }
};

FV_PIWG_DEVICE_PATH mFvPIWGDevicePathTemplate = {
  {
    {
      MEDIA_DEVICE_PATH,
      MEDIA_PIWG_FW_VOL_DP,
      {
        (UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH)),
        (UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH) >> 8)
      }
    },
    { 0 }
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    {
      END_DEVICE_PATH_LENGTH,
      0
    }
  }
};

//
// Template structure used when installing FVB protocol.
//
EFI_FW_VOL_BLOCK_DEVICE mFvbDeviceTemplate = {
  FVB_DEVICE_SIGNATURE,
  NULL,
  0, // Instance
  {
    FvbProtocolGetAttributes,
    FvbProtocolSetAttributes,
    FvbProtocolGetPhysicalAddress,
    FvbProtocolGetBlockSize,
    FvbProtocolRead,
    FvbProtocolWrite,
    FvbProtocolEraseBlocks,
    NULL
  } // FwVolBlockInstance
};


/**
  Get the pointer to EFI_FW_VOL_INSTANCE from the buffer pointed
  by mFvbModuleGlobal.FvInstance based on a index.
  Each EFI_FW_VOL_INSTANCE is  with variable length as
  we have a block map at the end of the EFI_FIRMWARE_VOLUME_HEADER.

  @param[in] Instance The index of the EFI_FW_VOL_INSTANCE.

  @return A pointer to EFI_FW_VOL_INSTANCE.

**/
EFI_FW_VOL_INSTANCE *
GetFvbInstance (
  IN  UINTN             Instance
  )
{
  EFI_FW_VOL_INSTANCE   *FwhRecord;

  if ( Instance >= mFvbModuleGlobal.NumFv ) {
    ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
    return NULL;
  }

  //
  // Find the right instance of the FVB private data.
  //
  FwhRecord = mFvbModuleGlobal.FvInstance;
  while ( Instance > 0 ) {
    FwhRecord = (EFI_FW_VOL_INSTANCE *) ((UINTN)((UINT8 *)FwhRecord) +
                FwhRecord->VolumeHeader.HeaderLength +
                (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER)));
    Instance --;
  }

  return FwhRecord;

}


/**
  Get the EFI_FVB_ATTRIBUTES_2 of a FV.

  @param[in]  The index of the EFI_FW_VOL_INSTANCE.

  @return     EFI_FVB_ATTRIBUTES_2 of the FV identified by Instance.

**/
STATIC
EFI_FVB_ATTRIBUTES_2
FvbGetVolumeAttributes (
  IN UINTN                                Instance
  )
{
  EFI_FW_VOL_INSTANCE *    FwInstance = NULL;
  FwInstance = GetFvbInstance(Instance);
  ASSERT (FwInstance != NULL);

  if ( FwInstance != NULL ) {
    return FwInstance->VolumeHeader.Attributes;
  } else {
    return 0;
  }
}


/**
  Retrieves the starting address of an LBA in an FV. It also
  return a few other attribut of the FV.

  @param[in]  Instance               The index of the EFI_FW_VOL_INSTANCE.
  @param[in]  Lba                    The logical block address.
  @param[out] LbaAddress             On output, contains the physical starting address
                                     of the Lba.
  @param[out] LbaLength              On output, contains the length of the block.
  @param[out] NumOfBlocks            A pointer to a caller allocated UINTN in which the
                                     number of consecutive blocks starting with Lba is
                                     returned. All blocks in this range have a size of
                                     BlockSize.

  @retval  EFI_SUCCESS Successfully  returns.
  @retval  EFI_INVALID_PARAMETER     Instance not found.

**/
STATIC
EFI_STATUS
FvbGetLbaAddress (
  IN  UINTN                               Instance,
  IN  EFI_LBA                             Lba,
  OUT UINTN                               *LbaAddress,
  OUT UINTN                               *LbaLength,
  OUT UINTN                               *NumOfBlocks
  )
{
  UINT32                                  NumBlocks = 0;
  UINT32                                  BlockLength = 0;
  UINTN                                   Offset;
  EFI_LBA                                 StartLba;
  EFI_LBA                                 NextLba;
  EFI_FW_VOL_INSTANCE                     *FwhInstance;
  EFI_FV_BLOCK_MAP_ENTRY                  *BlockMap = NULL;

  //
  // Find the right instance of the FVB private data.
  //
  FwhInstance = GetFvbInstance (Instance);

  StartLba  = 0;
  Offset    = 0;
  BlockMap  = &(FwhInstance->VolumeHeader.BlockMap[0]);
  ASSERT (BlockMap != NULL);

  //
  // Parse the blockmap of the FV to find which map entry the Lba belongs to.
  //
  while (TRUE) {
    if ( BlockMap != NULL) {
      NumBlocks   = BlockMap->NumBlocks;
      BlockLength = BlockMap->Length;
    }

    if ( NumBlocks == 0 || BlockLength == 0) {
      return EFI_INVALID_PARAMETER;
    }

    NextLba = StartLba + NumBlocks;

    //
    // The map entry found.
    //
    if (Lba >= StartLba && Lba < NextLba) {
      Offset = Offset + (UINTN)MultU64x32((Lba - StartLba), BlockLength);
      if ( LbaAddress && FwhInstance ) {
        *LbaAddress = FwhInstance->FvBase + Offset;
      }

      if (LbaLength ) {
        *LbaLength = BlockLength;
      }

      if (NumOfBlocks ) {
        *NumOfBlocks = (UINTN)(NextLba - Lba);
      }
      return EFI_SUCCESS;
    }

    StartLba  = NextLba;
    Offset    = Offset + NumBlocks * BlockLength;
    BlockMap++;
  }
}


/**
  Reads specified number of bytes into a buffer from the specified block.

  @param[in]      Instance               The FV instance to be read from.
  @param[in]      Lba                    The logical block address to be read from.
  @param[in]      BlockOffset            Offset into the block at which to begin reading.
  @param[in]      NumBytes               Pointer that on input contains the total size of
                                         the buffer. On output, it contains the total number
                                         of bytes read.
  @param[in]      Buffer                 Pointer to a caller allocated buffer that will be
                                         used to hold the data read.


  @retval         EFI_SUCCESS            The firmware volume was read successfully and
                                         contents are in Buffer.
  @retval         EFI_BAD_BUFFER_SIZE    Read attempted across a LBA boundary. On output,
                                         NumBytes contains the total number of bytes returned
                                         in Buffer.
  @retval         EFI_ACCESS_DENIED      The firmware volume is in the ReadDisabled state.
  @retval         EFI_DEVICE_ERROR       The block device is not functioning correctly and
                                         could not be read.
  @retval         EFI_INVALID_PARAMETER  Instance not found, or NumBytes, Buffer are NULL.

**/
STATIC
EFI_STATUS
FvbReadBlock (
  IN UINTN                                Instance,
  IN EFI_LBA                              Lba,
  IN UINTN                                BlockOffset,
  IN OUT UINTN                            *NumBytes,
  IN UINT8                                *Buffer
  )
{
  EFI_FVB_ATTRIBUTES_2                    Attributes;
  UINTN                                   LbaAddress;
  UINTN                                   LbaLength;
  EFI_STATUS                              Status;

  if ( (NumBytes == NULL) || (Buffer == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
  if (*NumBytes == 0) {
    return (EFI_INVALID_PARAMETER);
  }

  Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
  if (EFI_ERROR(Status)) {
    return Status;
  }

  Attributes = FvbGetVolumeAttributes (Instance);

  if ( (Attributes & EFI_FVB2_READ_STATUS) == 0) {
    return (EFI_ACCESS_DENIED);
  }

  if (BlockOffset > LbaLength) {
   return (EFI_INVALID_PARAMETER);
  }

  if (LbaLength < ( *NumBytes + BlockOffset ) ) {
    *NumBytes = (UINT32) (LbaLength - BlockOffset);
    Status = EFI_BAD_BUFFER_SIZE;
  }

  LibFvbFlashDeviceRead (LbaAddress + BlockOffset, NumBytes, Buffer);

  return Status;
}


/**
  Writes specified number of bytes from the input buffer to the block.

  @param[in]  Instance               The FV instance to be written to.
  @param[in]  Lba                    The starting logical block index to write to.
  @param[in]  BlockOffset            Offset into the block at which to begin writing.
  @param[in]  NumBytes               Pointer that on input contains the total size of
                                     the buffer. On output, it contains the total number
                                     of bytes actually written.
  @param[in]  Buffer                 Pointer to a caller allocated buffer that contains
                                     the source for the write.
  @retval     EFI_SUCCESS            The firmware volume was written successfully.
  @retval     EFI_BAD_BUFFER_SIZE    Write attempted across a LBA boundary. On output,
                                     NumBytes contains the total number of bytes
                                     actually writte.
  @retval     EFI_ACCESS_DENIED      The firmware volume is in the WriteDisabled state.
  @retval     EFI_DEVICE_ERROR       The block device is not functioning correctly and
                                     could not be written.
  @retval     EFI_INVALID_PARAMETER  Instance not found, or NumBytes, Buffer are NULL.

**/
EFI_STATUS
FvbWriteBlock (
  IN UINTN                                Instance,
  IN EFI_LBA                              Lba,
  IN UINTN                                BlockOffset,
  IN OUT UINTN                            *NumBytes,
  IN UINT8                                *Buffer
  )
{
  EFI_FVB_ATTRIBUTES_2                    Attributes;
  UINTN                                   LbaAddress;
  UINTN                                   LbaLength;
  EFI_STATUS                              Status;
  EFI_STATUS                              Status1;

  if ( (NumBytes == NULL) || (Buffer == NULL)) {
    return (EFI_INVALID_PARAMETER);
  }
  if (*NumBytes == 0) {
    return (EFI_INVALID_PARAMETER);
  }

  Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
  if (EFI_ERROR(Status)) {
    return Status;
  }

  //
  // Check if the FV is write enabled.
  //
  Attributes = FvbGetVolumeAttributes (Instance);
  if ( (Attributes & EFI_FVB2_WRITE_STATUS) == 0) {
    return (EFI_ACCESS_DENIED);
  }

  //
  // Perform boundary checks and adjust NumBytes.
  //
  if (BlockOffset > LbaLength) {
    return (EFI_INVALID_PARAMETER);
  }

  if ( LbaLength < ( *NumBytes + BlockOffset ) ) {
    DEBUG ((EFI_D_ERROR,
      "FvWriteBlock: Reducing Numbytes from 0x%x to 0x%x\n",
      *NumBytes,
      (UINT32)(LbaLength-BlockOffset))
      );
    *NumBytes = (UINT32) (LbaLength - BlockOffset);
    Status = EFI_BAD_BUFFER_SIZE;
  }

  LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, FALSE);

  Status1 = LibFvbFlashDeviceWrite (LbaAddress + BlockOffset, NumBytes, Buffer);

  LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, TRUE);
  WriteBackInvalidateDataCacheRange ((VOID *) (LbaAddress + BlockOffset), *NumBytes);

  if ( EFI_ERROR (Status1) ) {
    return Status1;
  }

  return Status;
}


/**
  Erases and initializes a firmware volume block.

  @param[in]    Instance           The FV instance to be erased.
  @param[in]    Lba                The logical block index to be erased.

  @retval   EFI_SUCCESS            The erase request was successfully completed.
  @retval   EFI_ACCESS_DENIED      The firmware volume is in the WriteDisabled state.
  @retval   EFI_DEVICE_ERROR       The block device is not functioning correctly and
                                   could not be written. Firmware device may have been
                                   partially erased.
  @retval   EFI_INVALID_PARAMETER  Instance not found.

**/
EFI_STATUS
FvbEraseBlock (
  IN UINTN                                Instance,
  IN EFI_LBA                              Lba
  )
{
  EFI_FVB_ATTRIBUTES_2                    Attributes;
  UINTN                                   LbaAddress;
  UINTN                                   LbaLength;
  EFI_STATUS                              Status;

  //
  // Check if the FV is write enabled.
  //
  Attributes = FvbGetVolumeAttributes (Instance);

  if( (Attributes & EFI_FVB2_WRITE_STATUS) == 0) {
    return (EFI_ACCESS_DENIED);
  }

  //
  // Get the starting address of the block for erase.
  //
  Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
  if (EFI_ERROR(Status)) {
    return Status;
  }

  LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, FALSE);

  Status = LibFvbFlashDeviceBlockErase (LbaAddress, LbaLength);

  LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, TRUE);

  WriteBackInvalidateDataCacheRange ((VOID *) LbaAddress, LbaLength);

  return Status;
}


/**
  Modifies the current settings of the firmware volume according to the
  input parameter, and returns the new setting of the volume.

  @param[in]  Instance              The FV instance whose attributes is going to be
                                    modified.
  @param[in]  Attributes            On input, it is a pointer to EFI_FVB_ATTRIBUTES_2
                                    containing the desired firmware volume settings.
                                    On successful return, it contains the new settings
                                    of the firmware volume.

  @retval     EFI_SUCCESS           Successfully returns.
  @retval     EFI_ACCESS_DENIED     The volume setting is locked and cannot be modified.
  @retval     EFI_INVALID_PARAMETER Instance not found, or The attributes requested are
                                    in conflict with the capabilities as declared in the
                                    firmware volume header.

**/
STATIC
EFI_STATUS
FvbSetVolumeAttributes (
  IN UINTN                                Instance,
  IN OUT EFI_FVB_ATTRIBUTES_2             *Attributes
  )
{
  EFI_FW_VOL_INSTANCE                       *FwhInstance = NULL;
  EFI_FVB_ATTRIBUTES_2                      OldAttributes = 0;
  EFI_FVB_ATTRIBUTES_2                      *AttribPtr = NULL;
  EFI_FVB_ATTRIBUTES_2                      UnchangedAttributes;
  UINT32                                    Capabilities;
  UINT32                                    OldStatus, NewStatus;

  //
  // Find the right instance of the FVB private data.
  //
  FwhInstance = GetFvbInstance (Instance);

  AttribPtr     = (EFI_FVB_ATTRIBUTES_2 *) & (FwhInstance->VolumeHeader.Attributes);
  ASSERT (AttribPtr != NULL);

  if ( AttribPtr != NULL) {
    OldAttributes = *AttribPtr;
  }

  Capabilities  = OldAttributes & EFI_FVB2_CAPABILITIES;
  OldStatus     = OldAttributes & EFI_FVB2_STATUS;
  NewStatus     = *Attributes & EFI_FVB2_STATUS;

  UnchangedAttributes = EFI_FVB2_READ_DISABLED_CAP  | \
                        EFI_FVB2_READ_ENABLED_CAP   | \
                        EFI_FVB2_WRITE_DISABLED_CAP | \
                        EFI_FVB2_WRITE_ENABLED_CAP  | \
                        EFI_FVB2_LOCK_CAP           | \
                        EFI_FVB2_STICKY_WRITE       | \
                        EFI_FVB2_MEMORY_MAPPED      | \
                        EFI_FVB2_ERASE_POLARITY     | \
                        EFI_FVB2_READ_LOCK_CAP      | \
                        EFI_FVB2_WRITE_LOCK_CAP     | \
                        EFI_FVB2_ALIGNMENT;

  //
  // Some attributes of FV is read only can *not* be set.
  //
  if ((OldAttributes & UnchangedAttributes) ^ (*Attributes & UnchangedAttributes)) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // If firmware volume is locked, no status bit can be updated.
  //
  if ( OldAttributes & EFI_FVB2_LOCK_STATUS ) {
    if ( OldStatus ^ NewStatus ) {
      return EFI_ACCESS_DENIED;
    }
  }

  //
  // Test read disable.
  //
  if ((Capabilities & EFI_FVB2_READ_DISABLED_CAP) == 0) {
    if ((NewStatus & EFI_FVB2_READ_STATUS) == 0) {
      return EFI_INVALID_PARAMETER;
    }
  }

  //
  // Test read enable.
  //
  if ((Capabilities & EFI_FVB2_READ_ENABLED_CAP) == 0) {
    if (NewStatus & EFI_FVB2_READ_STATUS) {
      return EFI_INVALID_PARAMETER;
    }
  }

  //
  // Test write disable.
  //
  if ((Capabilities & EFI_FVB2_WRITE_DISABLED_CAP) == 0) {
    if ((NewStatus & EFI_FVB2_WRITE_STATUS) == 0) {
      return EFI_INVALID_PARAMETER;
    }
  }

  //
  // Test write enable.
  //
  if ((Capabilities & EFI_FVB2_WRITE_ENABLED_CAP) == 0) {
    if (NewStatus & EFI_FVB2_WRITE_STATUS) {
      return EFI_INVALID_PARAMETER;
    }
  }

  //
  // Test lock.
  //
  if ((Capabilities & EFI_FVB2_LOCK_CAP) == 0) {
    if (NewStatus & EFI_FVB2_LOCK_STATUS) {
      return EFI_INVALID_PARAMETER;
    }
  }

  *AttribPtr  = (*AttribPtr) & (0xFFFFFFFF & (~EFI_FVB2_STATUS));
  *AttribPtr  = (*AttribPtr) | NewStatus;
  *Attributes = *AttribPtr;

  return EFI_SUCCESS;
}

//
// FVB protocol APIs.
//
/**
  Retrieves the physical address of the device.

  @param[in]  This    A pointer to EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL.
  @param[out] Address Output buffer containing the address.

  retval      EFI_SUCCESS The function always return successfully.

**/
EFI_STATUS
EFIAPI
FvbProtocolGetPhysicalAddress (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,
  OUT EFI_PHYSICAL_ADDRESS               *Address
  )
{
  EFI_FW_VOL_BLOCK_DEVICE               *FvbDevice;
  EFI_FW_VOL_INSTANCE                   *FvInstance;

  FvbDevice = FVB_DEVICE_FROM_THIS (This);
  FvInstance = GetFvbInstance(FvbDevice->Instance);

  if (FvInstance != NULL) {
    *Address = FvInstance->FvBase;
  }

  return EFI_SUCCESS;
}


/**
  Retrieve the size of a logical block.

  @param[in]  This         Calling context.
  @param[in]  Lba          Indicates which block to return the size for.
  @param[out] BlockSize    A pointer to a caller allocated UINTN in which
                           the size of the block is returned.
  @param[out] NumOfBlocks  A pointer to a caller allocated UINTN in which the
                           number of consecutive blocks starting with Lba is
                           returned. All blocks in this range have a size of
                           BlockSize.

  @retval     EFI_SUCCESS  The function always return successfully.

**/
EFI_STATUS
EFIAPI
FvbProtocolGetBlockSize (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,
  IN  EFI_LBA                            Lba,
  OUT UINTN                              *BlockSize,
  OUT UINTN                              *NumOfBlocks
  )
{
  EFI_FW_VOL_BLOCK_DEVICE                 *FvbDevice;

  DEBUG((EFI_D_INFO,
    "FvbProtocolGetBlockSize: Lba: 0x%lx BlockSize: 0x%x NumOfBlocks: 0x%x\n",
    Lba,
    BlockSize,
    NumOfBlocks)
    );

  FvbDevice = FVB_DEVICE_FROM_THIS (This);

  return FvbGetLbaAddress (
           FvbDevice->Instance,
           Lba,
           NULL,
           BlockSize,
           NumOfBlocks
           );
}


/**
  Retrieves Volume attributes.  No polarity translations are done.

  @param[in]    This         Calling context.
  @param[out]   Attributes   Output buffer which contains attributes.

  @retval       EFI_SUCCESS  The function always return successfully.

**/
EFI_STATUS
EFIAPI
FvbProtocolGetAttributes (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL   *This,
  OUT EFI_FVB_ATTRIBUTES_2                *Attributes
  )
{
  EFI_FW_VOL_BLOCK_DEVICE               *FvbDevice;

  FvbDevice = FVB_DEVICE_FROM_THIS (This);

  *Attributes = FvbGetVolumeAttributes (FvbDevice->Instance);

  DEBUG ((EFI_D_INFO,
    "FvbProtocolGetAttributes: This: 0x%x Attributes: 0x%x\n",
    This,
    *Attributes)
    );

  return EFI_SUCCESS;
}


/**
  Sets Volume attributes. No polarity translations are done.

  @param[in]  This         Calling context.
  @param[out] Attributes   Output buffer which contains attributes.

  @retval     EFI_SUCCESS  The function always return successfully.

**/
EFI_STATUS
EFIAPI
FvbProtocolSetAttributes (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL   *This,
  IN OUT EFI_FVB_ATTRIBUTES_2             *Attributes
  )
{
  EFI_STATUS                            Status;
  EFI_FW_VOL_BLOCK_DEVICE               *FvbDevice;

  DEBUG((EFI_D_INFO,
    "FvbProtocolSetAttributes: Before SET -  This: 0x%x Attributes: 0x%x\n",
    This,
    *Attributes)
    );

  FvbDevice = FVB_DEVICE_FROM_THIS (This);

  Status = FvbSetVolumeAttributes (FvbDevice->Instance, Attributes);

  DEBUG((EFI_D_INFO,
    "FvbProtocolSetAttributes: After SET -  This: 0x%x Attributes: 0x%x\n",
    This,
    *Attributes)
    );

  return Status;
}


/**
  The EraseBlock() function erases one or more blocks as denoted by the
  variable argument list. The entire parameter list of blocks must be verified
  prior to erasing any blocks.  If a block is requested that does not exist
  within the associated firmware volume (it has a larger index than the last
  block of the firmware volume), the EraseBlock() function must return
  EFI_INVALID_PARAMETER without modifying the contents of the firmware volume.

  @param[in] This            Calling context.
  @param[in] ...             Starting LBA followed by Number of Lba to erase.
                             a -1 to terminate the list.

  @retval EFI_SUCCESS        The erase request was successfully completed.
  @retval EFI_ACCESS_DENIED  The firmware volume is in the WriteDisabled state.
  @retval EFI_DEVICE_ERROR   The block device is not functioning correctly and
                             could not be written. Firmware device may have been
                             partially erased.

**/
EFI_STATUS
EFIAPI
FvbProtocolEraseBlocks (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL    *This,
  ...
  )
{
  EFI_FW_VOL_BLOCK_DEVICE               *FvbDevice;
  EFI_FW_VOL_INSTANCE                   *FwhInstance;
  UINTN                                 NumOfBlocks = 0;
  VA_LIST                               args;
  EFI_LBA                               StartingLba;
  UINTN                                 NumOfLba;
  EFI_STATUS                            Status;

  DEBUG((EFI_D_INFO, "FvbProtocolEraseBlocks: \n"));
  FvbDevice = FVB_DEVICE_FROM_THIS (This);

  FwhInstance  = GetFvbInstance (FvbDevice->Instance);

  if (FwhInstance != NULL) {
    NumOfBlocks = FwhInstance->NumOfBlocks;
  }

  VA_START (args, This);

  do {
    StartingLba = VA_ARG (args, EFI_LBA);
    if ( StartingLba == EFI_LBA_LIST_TERMINATOR ) {
      break;
    }

    NumOfLba = VA_ARG (args, UINT32);

    //
    // Check input parameters.
    //
    if (NumOfLba == 0) {
      VA_END (args);
      return EFI_INVALID_PARAMETER;
    }

    if ( ( StartingLba + NumOfLba ) > NumOfBlocks ) {
      return EFI_INVALID_PARAMETER;
    }
  } while ( 1 );

  VA_END (args);

  VA_START (args, This);
  do {
    StartingLba = VA_ARG (args, EFI_LBA);
    if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
      break;
    }

    NumOfLba = VA_ARG (args, UINT32);

    while ( NumOfLba > 0 ) {
      Status = FvbEraseBlock (FvbDevice->Instance, StartingLba);
      if ( EFI_ERROR(Status)) {
        VA_END (args);
        return Status;
      }
      StartingLba ++;
      NumOfLba --;
    }

  } while ( 1 );

  VA_END (args);

  return EFI_SUCCESS;
}


/**
  Writes data beginning at Lba:Offset from FV. The write terminates either
  when *NumBytes of data have been written, or when a block boundary is
  reached.  *NumBytes is updated to reflect the actual number of bytes
  written. The write opertion does not include erase. This routine will
  attempt to write only the specified bytes. If the writes do not stick,
  it will return an error.

  @param[in]      This      Calling context.
  @param[in]      Lba       Block in which to begin write.
  @param[in]      Offset    Offset in the block at which to begin write.
  @param[in,out]  NumBytes  On input, indicates the requested write size. On
                            output, indicates the actual number of bytes written
  @param[in]      Buffer    Buffer containing source data for the write.

  @retval EFI_SUCCESS           The firmware volume was written successfully.
  @retval EFI_BAD_BUFFER_SIZE   Write attempted across a LBA boundary. On output,
                                NumBytes contains the total number of bytes
                                actually written.
  @retval EFI_ACCESS_DENIED     The firmware volume is in the WriteDisabled state.
  @retval EFI_DEVICE_ERROR      The block device is not functioning correctly and
                                could not be written.
  @retval EFI_INVALID_PARAMETER NumBytes or Buffer are NULL.

**/
EFI_STATUS
EFIAPI
FvbProtocolWrite (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL   *This,
  IN EFI_LBA                              Lba,
  IN UINTN                                Offset,
  IN OUT UINTN                            *NumBytes,
  IN UINT8                                *Buffer
  )
{

  EFI_FW_VOL_BLOCK_DEVICE               *FvbDevice;

  FvbDevice = FVB_DEVICE_FROM_THIS (This);

  DEBUG((EFI_D_INFO,
    "FvbProtocolWrite: Lba: 0x%lx Offset: 0x%x NumBytes: 0x%x, Buffer: 0x%x\n",
    Lba,
    Offset,
    *NumBytes,
    Buffer)
    );

  return FvbWriteBlock (FvbDevice->Instance, Lba, Offset, NumBytes, Buffer);
}


/**
  Reads data beginning at Lba:Offset from FV. The Read terminates either
  when *NumBytes of data have been read, or when a block boundary is
  reached.  *NumBytes is updated to reflect the actual number of bytes
  written. The write opertion does not include erase. This routine will
  attempt to write only the specified bytes. If the writes do not stick,
  it will return an error.

  @param[in]      This      Calling context.
  @param[in]      Lba       Block in which to begin write.
  @param[in]      Offset    Offset in the block at which to begin write
  @param[in,out]  NumBytes  On input, indicates the requested write size. On
                            output, indicates the actual number of bytes written.
  @param[in]      Buffer    Buffer containing source data for the write.


Returns:
  @retval EFI_SUCCESS            The firmware volume was read successfully and
                                 contents are in Buffer.
  @retval EFI_BAD_BUFFER_SIZE    Read attempted across a LBA boundary. On output,
                                 NumBytes contains the total number of bytes returned
                                 in Buffer.
  @retval EFI_ACCESS_DENIED      The firmware volume is in the ReadDisabled state
  @retval EFI_DEVICE_ERROR       The block device is not functioning correctly and
                                 could not be read.
  @retval EFI_INVALID_PARAMETER  NumBytes or Buffer are NULL.

**/
EFI_STATUS
EFIAPI
FvbProtocolRead (
  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL   *This,
  IN EFI_LBA                              Lba,
  IN UINTN                                Offset,
  IN OUT UINTN                            *NumBytes,
  OUT UINT8                                *Buffer
  )
{

  EFI_FW_VOL_BLOCK_DEVICE   *FvbDevice;
  EFI_STATUS                Status;

  FvbDevice = FVB_DEVICE_FROM_THIS (This);
  Status = FvbReadBlock (FvbDevice->Instance, Lba, Offset, NumBytes, Buffer);
  DEBUG((EFI_D_INFO,
    "FvbProtocolRead: Lba: 0x%lx Offset: 0x%x NumBytes: 0x%x, Buffer: 0x%x\n",
    Lba,
    Offset,
    *NumBytes,
    Buffer)
    );

  return Status;
}


/**
  Check the integrity of firmware volume header.

  @param[in]  FwVolHeader   A pointer to a firmware volume header.

  @retval     TRUE          The firmware volume is consistent.
  @retval     FALSE         The firmware volume has corrupted.

**/
BOOLEAN
IsFvHeaderValid (
  IN       EFI_PHYSICAL_ADDRESS          FvBase,
  IN CONST EFI_FIRMWARE_VOLUME_HEADER    *FwVolHeader
  )
{
  if (FvBase == PcdGet32(PcdFlashNvStorageVariableBase)) {
    if (CompareMem (&FwVolHeader->FileSystemGuid, &gEfiSystemNvDataFvGuid, sizeof(EFI_GUID)) != 0 ) {
      return FALSE;
    }
  } else {
    if (CompareMem (&FwVolHeader->FileSystemGuid, &gEfiFirmwareFileSystem2Guid, sizeof(EFI_GUID)) != 0 ) {
      return FALSE;
    }
  }
  if ( (FwVolHeader->Revision != EFI_FVH_REVISION)   ||
       (FwVolHeader->Signature != EFI_FVH_SIGNATURE) ||
       (FwVolHeader->FvLength == ((UINTN) -1))       ||
       ((FwVolHeader->HeaderLength & 0x01 ) !=0) ) {
    return FALSE;
  }

  if (CalculateCheckSum16 ((UINT16 *) FwVolHeader, FwVolHeader->HeaderLength) != 0) {
    return FALSE;
  }

  return TRUE;
}


/**
  The function does the necessary initialization work for
  Firmware Volume Block Driver.

  @retval     EFI_SUCCESS       This funtion always return EFI_SUCCESS.
                                It will ASSERT on errors.

**/
EFI_STATUS
FvbInitialize (
  VOID
  )
{
  EFI_FW_VOL_INSTANCE                   *FwhInstance;
  EFI_FIRMWARE_VOLUME_HEADER            *FwVolHeader;
  EFI_FIRMWARE_VOLUME_HEADER            *FvHeader;
  EFI_FV_BLOCK_MAP_ENTRY                *PtrBlockMapEntry;
  EFI_PHYSICAL_ADDRESS                  BaseAddress;
  EFI_STATUS                            Status;
  UINTN                                 BufferSize;
  UINTN                                 TmpHeaderLength;
  UINTN                                 Idx;
  UINT32                                MaxLbaSize;

  //
  // Calculate the total size for all firmware volume block instances.
  //
  BufferSize = 0;
  for (Idx = 0; Idx < 1; Idx++) {
    FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) mPlatformFvBaseAddress[Idx];
    BufferSize +=  (FvHeader->HeaderLength +
                    sizeof (EFI_FW_VOL_INSTANCE) -
                    sizeof (EFI_FIRMWARE_VOLUME_HEADER)
                   );
  }

  mFvbModuleGlobal.FvInstance =  (EFI_FW_VOL_INSTANCE *) AllocateRuntimeZeroPool (BufferSize);
  ASSERT (NULL != mFvbModuleGlobal.FvInstance);


  MaxLbaSize      = 0;
  FwhInstance     = mFvbModuleGlobal.FvInstance;
  mFvbModuleGlobal.NumFv   = 0;

  for (Idx = 0; Idx < 1; Idx++) {
    BaseAddress = mPlatformFvBaseAddress[Idx];
    FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) BaseAddress;

    if (!IsFvHeaderValid (BaseAddress, FwVolHeader)) {
      //
      // If not valid, get FvbInfo from the information carried in
      // FVB driver.
      //
      DEBUG ((EFI_D_ERROR, "Fvb: FV header @ 0x%lx invalid\n", BaseAddress));
      Status          = GetFvbInfo (BaseAddress, &FwVolHeader);
      ASSERT_EFI_ERROR(Status);
      //
      //  Write back a healthy FV header.
      //
      DEBUG ((EFI_D_ERROR, "FwBlockService.c: Writing back healthy FV header\n"));
      LibFvbFlashDeviceBlockLock ((UINTN)BaseAddress, FwVolHeader->BlockMap->Length, FALSE);

      Status = LibFvbFlashDeviceBlockErase ((UINTN)BaseAddress, FwVolHeader->BlockMap->Length);

      TmpHeaderLength = (UINTN) FwVolHeader->HeaderLength;
      Status = LibFvbFlashDeviceWrite (
                 (UINTN)BaseAddress,
                 &TmpHeaderLength,
                 (UINT8 *) FwVolHeader
                 );

      LibFvbFlashDeviceBlockLock ((UINTN)BaseAddress, FwVolHeader->BlockMap->Length, TRUE);

      WriteBackInvalidateDataCacheRange (
        (VOID *) (UINTN) BaseAddress,
        FwVolHeader->BlockMap->Length
        );

    }

    CopyMem (&(FwhInstance->VolumeHeader), FwVolHeader, FwVolHeader->HeaderLength);

    FwVolHeader = &(FwhInstance->VolumeHeader);
    FwhInstance->FvBase = (UINTN)BaseAddress;

    //
    // Process the block map for each FV.
    //
    FwhInstance->NumOfBlocks = 0;
    for (PtrBlockMapEntry = FwVolHeader->BlockMap; PtrBlockMapEntry->NumBlocks != 0; PtrBlockMapEntry++) {
      //
      // Get the maximum size of a block.
      //
      if (MaxLbaSize < PtrBlockMapEntry->Length) {
        MaxLbaSize  = PtrBlockMapEntry->Length;
      }
      FwhInstance->NumOfBlocks += PtrBlockMapEntry->NumBlocks;
    }

    //
    // Add a FVB Protocol Instance.
    //
    mFvbModuleGlobal.NumFv++;
    InstallFvbProtocol (FwhInstance, mFvbModuleGlobal.NumFv - 1);

    //
    // Move on to the next FwhInstance.
    //
    FwhInstance = (EFI_FW_VOL_INSTANCE *) ((UINTN)((UINT8 *)FwhInstance) +
                                          FwVolHeader->HeaderLength +
                                          (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER)));

  }

  return EFI_SUCCESS;
}