/** @file
  Block IO2 protocol as defined in the UEFI 2.3.1 specification.

  The Block IO2 protocol defines an extension to the Block IO protocol which
  enables the ability to read and write data at a block level in a non-blocking
  manner.

  Copyright (c) 2011, 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.             

**/

#ifndef __BLOCK_IO2_H__
#define __BLOCK_IO2_H__

#include <Protocol/BlockIo.h>

#define EFI_BLOCK_IO2_PROTOCOL_GUID \
  { \
    0xa77b2472, 0xe282, 0x4e9f, {0xa2, 0x45, 0xc2, 0xc0, 0xe2, 0x7b, 0xbc, 0xc1} \
  }

typedef struct _EFI_BLOCK_IO2_PROTOCOL  EFI_BLOCK_IO2_PROTOCOL;

/**
  The struct of Block IO2 Token.
**/
typedef struct {

  ///
  /// If Event is NULL, then blocking I/O is performed.If Event is not NULL and
  /// non-blocking I/O is supported, then non-blocking I/O is performed, and
  /// Event will be signaled when the read request is completed.
  ///
  EFI_EVENT               Event;

  ///
  /// Defines whether or not the signaled event encountered an error.
  ///
  EFI_STATUS              TransactionStatus;
} EFI_BLOCK_IO2_TOKEN;


/**
  Reset the block device hardware.

  @param[in]  This                 Indicates a pointer to the calling context.
  @param[in]  ExtendedVerification Indicates that the driver may perform a more
                                   exhausive verification operation of the device
                                   during reset.

  @retval EFI_SUCCESS          The device was reset.
  @retval EFI_DEVICE_ERROR     The device is not functioning properly and could
                               not be reset.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_RESET_EX) (
  IN EFI_BLOCK_IO2_PROTOCOL  *This,
  IN BOOLEAN                 ExtendedVerification
  );

/**
  Read BufferSize bytes from Lba into Buffer.
  
  This function reads the requested number of blocks from the device. All the
  blocks are read, or an error is returned.
  If EFI_DEVICE_ERROR, EFI_NO_MEDIA,_or EFI_MEDIA_CHANGED is returned and
  non-blocking I/O is being used, the Event associated with this request will
  not be signaled.

  @param[in]       This       Indicates a pointer to the calling context.
  @param[in]       MediaId    Id of the media, changes every time the media is 
                              replaced.
  @param[in]       Lba        The starting Logical Block Address to read from.
  @param[in, out]  Token	    A pointer to the token associated with the transaction.
  @param[in]       BufferSize Size of Buffer, must be a multiple of device block size.  
  @param[out]      Buffer     A pointer to the destination buffer for the data. The 
                              caller is responsible for either having implicit or 
                              explicit ownership of the buffer.

  @retval EFI_SUCCESS           The read request was queued if Token->Event is
                                not NULL.The data was read correctly from the
                                device if the Token->Event is NULL.
  @retval EFI_DEVICE_ERROR      The device reported an error while performing
                                the read.
  @retval EFI_NO_MEDIA          There is no media in the device.
  @retval EFI_MEDIA_CHANGED     The MediaId is not for the current media.
  @retval EFI_BAD_BUFFER_SIZE   The BufferSize parameter is not a multiple of the
                                intrinsic block size of the device.
  @retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid, 
                                or the buffer is not on proper alignment.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack
                                of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_READ_EX) (
  IN     EFI_BLOCK_IO2_PROTOCOL *This,
  IN     UINT32                 MediaId,
  IN     EFI_LBA                LBA,
  IN OUT EFI_BLOCK_IO2_TOKEN    *Token,
  IN     UINTN                  BufferSize,
     OUT VOID                  *Buffer
  );

/**
  Write BufferSize bytes from Lba into Buffer.

  This function writes the requested number of blocks to the device. All blocks
  are written, or an error is returned.If EFI_DEVICE_ERROR, EFI_NO_MEDIA,
  EFI_WRITE_PROTECTED or EFI_MEDIA_CHANGED is returned and non-blocking I/O is
  being used, the Event associated with this request will not be signaled.

  @param[in]       This       Indicates a pointer to the calling context.
  @param[in]       MediaId    The media ID that the write request is for.
  @param[in]       Lba        The starting logical block address to be written. The
                              caller is responsible for writing to only legitimate
                              locations.
  @param[in, out]  Token      A pointer to the token associated with the transaction.
  @param[in]       BufferSize Size of Buffer, must be a multiple of device block size.
  @param[in]       Buffer     A pointer to the source buffer for the data.

  @retval EFI_SUCCESS           The write request was queued if Event is not NULL.
                                The data was written correctly to the device if
                                the Event is NULL.
  @retval EFI_WRITE_PROTECTED   The device can not be written to.
  @retval EFI_NO_MEDIA          There is no media in the device.
  @retval EFI_MEDIA_CHNAGED     The MediaId does not matched the current device.
  @retval EFI_DEVICE_ERROR      The device reported an error while performing the write.
  @retval EFI_BAD_BUFFER_SIZE   The Buffer was not a multiple of the block size of the device.
  @retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid, 
                                or the buffer is not on proper alignment.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack
                                of resources.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_WRITE_EX) (
  IN     EFI_BLOCK_IO2_PROTOCOL  *This,
  IN     UINT32                 MediaId,
  IN     EFI_LBA                LBA,
  IN OUT EFI_BLOCK_IO2_TOKEN    *Token,
  IN     UINTN                  BufferSize,
  IN     VOID                   *Buffer
  );

/**
  Flush the Block Device.
 
  If EFI_DEVICE_ERROR, EFI_NO_MEDIA,_EFI_WRITE_PROTECTED or EFI_MEDIA_CHANGED
  is returned and non-blocking I/O is being used, the Event associated with
  this request will not be signaled.  

  @param[in]      This     Indicates a pointer to the calling context.
  @param[in,out]  Token    A pointer to the token associated with the transaction

  @retval EFI_SUCCESS          The flush request was queued if Event is not NULL.
                               All outstanding data was written correctly to the
                               device if the Event is NULL.
  @retval EFI_DEVICE_ERROR     The device reported an error while writting back
                               the data.
  @retval EFI_WRITE_PROTECTED  The device cannot be written to.
  @retval EFI_NO_MEDIA         There is no media in the device.
  @retval EFI_MEDIA_CHANGED    The MediaId is not for the current media.
  @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack
                               of resources.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_FLUSH_EX) (
  IN     EFI_BLOCK_IO2_PROTOCOL   *This,
  IN OUT EFI_BLOCK_IO2_TOKEN      *Token
  );

///
///  The Block I/O2 protocol defines an extension to the Block I/O protocol which
///  enables the ability to read and write data at a block level in a non-blocking
//   manner.
///
struct _EFI_BLOCK_IO2_PROTOCOL {
  ///
  /// A pointer to the EFI_BLOCK_IO_MEDIA data for this device. 
  /// Type EFI_BLOCK_IO_MEDIA is defined in BlockIo.h.
  ///  
  EFI_BLOCK_IO_MEDIA      *Media;

  EFI_BLOCK_RESET_EX      Reset;
  EFI_BLOCK_READ_EX       ReadBlocksEx;
  EFI_BLOCK_WRITE_EX      WriteBlocksEx;
  EFI_BLOCK_FLUSH_EX      FlushBlocksEx;
};

extern EFI_GUID gEfiBlockIo2ProtocolGuid;

#endif

