ftwlite.h

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/*++

Copyright (c) 2004, Intel Corporation                                                         
All rights reserved. This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 


Module Name:

  FtwLite.h

Abstract:

  This is a simple fault tolerant write driver, based on PlatformFd library.
  And it only supports write BufferSize <= SpareAreaLength.

  This boot service only protocol provides fault tolerant write capability for 
  block devices.  The protocol has internal non-volatile intermediate storage 
  of the data and private information. It should be able to recover 
  automatically from a critical fault, such as power failure. 

--*/

#ifndef _EFI_FAULT_TOLERANT_WRITE_LITE_H_
#define _EFI_FAULT_TOLERANT_WRITE_LITE_H_

#include "Tiano.h"
#include "EfiDriverLib.h"

#include EFI_GUID_DEFINITION (AlternateFvBlock)
#include EFI_GUID_DEFINITION (SystemNvDataGuid)
#include EFI_PROTOCOL_CONSUMER (FirmwareVolumeBlock)
#include EFI_PROTOCOL_CONSUMER (PciRootBridgeIo)
#include EFI_PROTOCOL_PRODUCER (FaultTolerantWriteLite)

#define EFI_D_FTW_LITE  EFI_D_ERROR
#define EFI_D_FTW_INFO  EFI_D_INFO

//
// Flash erase polarity is 1
//
#define FTW_ERASE_POLARITY  1

#define FTW_VALID_STATE     0
#define FTW_INVALID_STATE   1

#define FTW_ERASED_BYTE     ((UINT8) (255))
#define FTW_POLARITY_REVERT ((UINT8) (255))

#include "EfiWorkingBlockHeader.h"

typedef struct {
  UINT8         WriteAllocated : 1;
  UINT8         SpareCompleted : 1;
  UINT8         WriteCompleted : 1;
  UINT8         Reserved : 5;
#define WRITE_ALLOCATED 0x1
#define SPARE_COMPLETED 0x2
#define WRITE_COMPLETED 0x4

  EFI_DEV_PATH  DevPath;
  EFI_LBA       Lba;
  UINTN         Offset;
  UINTN         NumBytes;
  //
  // UINTN           SpareAreaOffset;
  //
} EFI_FTW_LITE_RECORD;

#define FTW_LITE_DEVICE_SIGNATURE EFI_SIGNATURE_32 ('F', 'T', 'W', 'L')

//
// MACRO for Block size.
// Flash Erasing will do in block granularity.
//
#ifdef FV_BLOCK_SIZE
#define FTW_BLOCK_SIZE  FV_BLOCK_SIZE
#else
#define FV_BLOCK_SIZE   0x10000
#define FTW_BLOCK_SIZE  FV_BLOCK_SIZE
#endif
//
// MACRO for FTW WORK SPACE Base & Size
//
#ifdef EFI_FTW_WORKING_OFFSET
#define FTW_WORK_SPACE_BASE EFI_FTW_WORKING_OFFSET
#else
#define FTW_WORK_SPACE_BASE 0x00E000
#endif

#ifdef EFI_FTW_WORKING_LENGTH
#define FTW_WORK_SPACE_SIZE EFI_FTW_WORKING_LENGTH
#else
#define FTW_WORK_SPACE_SIZE 0x002000
#endif
//
// MACRO for FTW header and record
//
#define FTW_WORKING_QUEUE_SIZE  (FTW_WORK_SPACE_SIZE - sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER))
#define FTW_LITE_RECORD_SIZE    (sizeof (EFI_FTW_LITE_RECORD))
#define WRITE_TOTAL_SIZE        FTW_LITE_RECORD_SIZE

//
// EFI Fault tolerant protocol private data structure
//
typedef struct {
  UINTN                                   Signature;
  EFI_HANDLE                              Handle;
  EFI_FTW_LITE_PROTOCOL                   FtwLiteInstance;
  EFI_PHYSICAL_ADDRESS                    WorkSpaceAddress;
  UINTN                                   WorkSpaceLength;
  EFI_PHYSICAL_ADDRESS                    SpareAreaAddress;
  UINTN                                   SpareAreaLength;
  UINTN                                   NumberOfSpareBlock; // Number of the blocks in spare block
  UINTN                                   SizeOfSpareBlock;   // Block size in bytes of the blocks in spare block
  EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *FtwWorkSpaceHeader;
  EFI_FTW_LITE_RECORD                     *FtwLastRecord;
  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL      *FtwFvBlock;        // FVB of working block
  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL      *FtwBackupFvb;      // FVB of spare block
  EFI_LBA                                 FtwSpareLba;
  EFI_LBA                                 FtwWorkBlockLba;    // Start LBA of working block
  EFI_LBA                                 FtwWorkSpaceLba;    // Start LBA of working space
  UINTN                                   FtwWorkSpaceBase;   // Offset from LBA start addr
  UINTN                                   FtwWorkSpaceSize;
  UINT8                                   *FtwWorkSpace;
  //
  // Following a buffer of FtwWorkSpace[FTW_WORK_SPACE_SIZE],
  // Allocated with EFI_FTW_LITE_DEVICE.
  //
} EFI_FTW_LITE_DEVICE;

#define FTW_LITE_CONTEXT_FROM_THIS(a) CR (a, EFI_FTW_LITE_DEVICE, FtwLiteInstance, FTW_LITE_DEVICE_SIGNATURE)

//
// Driver entry point
//
EFI_STATUS
EFIAPI
InitializeFtwLite (
  IN EFI_HANDLE                 ImageHandle,
  IN EFI_SYSTEM_TABLE           *SystemTable
  )
/*++

Routine Description:
    This function is the entry point of the Fault Tolerant Write driver.

Arguments:
    ImageHandle   - EFI_HANDLE: A handle for the image that is initializing 
                    this driver
    SystemTable   - EFI_SYSTEM_TABLE: A pointer to the EFI system table

Returns:
    EFI_SUCCESS           - FTW has finished the initialization
    EFI_ABORTED           - FTW initialization error

--*/
;

//
// Fault Tolerant Write Protocol API
//
EFI_STATUS
EFIAPI
FtwLiteWrite (
  IN EFI_FTW_LITE_PROTOCOL                 *This,
  IN EFI_HANDLE                            FvbHandle,
  IN EFI_LBA                               Lba,
  IN UINTN                                 Offset,
  IN UINTN                                 *NumBytes,
  IN VOID                                  *Buffer
  )
/*++

Routine Description:
    Starts a target block update. This function will record data about write 
    in fault tolerant storage and will complete the write in a recoverable 
    manner, ensuring at all times that either the original contents or 
    the modified contents are available.

Arguments:
    This             - Calling context
    FvbHandle        - The handle of FVB protocol that provides services for 
                       reading, writing, and erasing the target block.
    Lba              - The logical block address of the target block.  
    Offset           - The offset within the target block to place the data.
    NumBytes         - The number of bytes to write to the target block.
    Buffer           - The data to write.

Returns:
    EFI_SUCCESS          - The function completed successfully
    EFI_BAD_BUFFER_SIZE  - The write would span a target block, which is not 
                           a valid action.
    EFI_ACCESS_DENIED    - No writes have been allocated.
    EFI_NOT_FOUND        - Cannot find FVB by handle.
    EFI_OUT_OF_RESOURCES - Cannot allocate memory.
    EFI_ABORTED          - The function could not complete successfully.

--*/
;

//
// Internal functions
//
STATIC
EFI_STATUS
FtwRestart (
  IN EFI_FTW_LITE_DEVICE    *FtwLiteDevice
  )
/*++

Routine Description:
    Restarts a previously interrupted write. The caller must provide the 
    block protocol needed to complete the interrupted write.

Arguments:
    FtwLiteDevice       - The private data of FTW_LITE driver
    FvbHandle           - The handle of FVB protocol that provides services for 
                          reading, writing, and erasing the target block.

Returns:
    EFI_SUCCESS         - The function completed successfully
    EFI_ACCESS_DENIED   - No pending writes exist
    EFI_NOT_FOUND       - FVB protocol not found by the handle
    EFI_ABORTED         - The function could not complete successfully

--*/
;

STATIC
EFI_STATUS
FtwAbort (
  IN EFI_FTW_LITE_DEVICE    *FtwLiteDevice
  )
/*++

Routine Description:
    Aborts all previous allocated writes.

Arguments:
    FtwLiteDevice    - The private data of FTW_LITE driver

Returns:
    EFI_SUCCESS      - The function completed successfully
    EFI_ABORTED      - The function could not complete successfully.
    EFI_NOT_FOUND    - No allocated writes exist.

--*/
;

STATIC
EFI_STATUS
FtwWriteRecord (
  IN EFI_FTW_LITE_DEVICE                   *FtwLiteDevice,
  IN EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL    *Fvb
  )
/*++

Routine Description:
    Write a record with fault tolerant mannaer.
    Since the content has already backuped in spare block, the write is 
    guaranteed to be completed with fault tolerant manner.

Arguments:
    FtwLiteDevice       - The private data of FTW_LITE driver
    Fvb                 - The FVB protocol that provides services for 
                          reading, writing, and erasing the target block.

Returns:
    EFI_SUCCESS         - The function completed successfully
    EFI_ABORTED         - The function could not complete successfully

--*/
;

EFI_STATUS
FtwEraseBlock (
  IN EFI_FTW_LITE_DEVICE              *FtwLiteDevice,
  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *FvBlock,
  EFI_LBA                             Lba
  )
/*++

Routine Description:
    To Erase one block. The size is FTW_BLOCK_SIZE

Arguments:
    FtwLiteDevice - Calling context
    FvBlock       - FVB Protocol interface
    Lba           - Lba of the firmware block

Returns:
    EFI_SUCCESS   - Block LBA is Erased successfully
    Others        - Error occurs

--*/
;

EFI_STATUS
FtwEraseSpareBlock (
  IN EFI_FTW_LITE_DEVICE   *FtwLiteDevice
  )
/*++

Routine Description:

  Erase spare block.

Arguments:

  FtwLiteDevice - Calling context

Returns:

  Status code

--*/
;

EFI_STATUS
FtwGetFvbByHandle (
  IN EFI_HANDLE                           FvBlockHandle,
  OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  **FvBlock
  )
/*++

Routine Description:
    Retrive the proper FVB protocol interface by HANDLE.

Arguments:
    FvBlockHandle       - The handle of FVB protocol that provides services for 
                          reading, writing, and erasing the target block.
    FvBlock             - The interface of FVB protocol

Returns:
    EFI_SUCCESS         - The function completed successfully
    EFI_ABORTED         - The function could not complete successfully
--*/