/** @file
  This file defines the EFI Erase Block Protocol.

  Copyright (c) 2016, 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.

  @par Revision Reference:
  This Protocol is introduced in UEFI Specification 2.6

**/

#ifndef __EFI_ERASE_BLOCK_PROTOCOL_H__
#define __EFI_ERASE_BLOCK_PROTOCOL_H__

#define EFI_ERASE_BLOCK_PROTOCOL_GUID \
  { \
    0x95a9a93e, 0xa86e, 0x4926, { 0xaa, 0xef, 0x99, 0x18, 0xe7, 0x72, 0xd9, 0x87 } \
  }

typedef struct _EFI_ERASE_BLOCK_PROTOCOL EFI_ERASE_BLOCK_PROTOCOL;

#define EFI_ERASE_BLOCK_PROTOCOL_REVISION ((2<<16) | (60))

///
/// EFI_ERASE_BLOCK_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 erase request is completed.
  //
  EFI_EVENT             Event;
  //
  // Defines whether the signaled event encountered an error.
  //
  EFI_STATUS            TransactionStatus;
} EFI_ERASE_BLOCK_TOKEN;

/**
  Erase a specified number of device blocks.

  @param[in]       This           Indicates a pointer to the calling context.
  @param[in]       MediaId        The media ID that the erase request is for.
  @param[in]       LBA            The starting logical block address to be
                                  erased. The caller is responsible for erasing
                                  only legitimate locations.
  @param[in, out]  Token          A pointer to the token associated with the
                                  transaction.
  @param[in]       Size           The size in bytes to be erased. This must be
                                  a multiple of the physical block size of the
                                  device.

  @retval EFI_SUCCESS             The erase request was queued if Event is not
                                  NULL. The data was erased correctly to the
                                  device if the Event is NULL.to the device.
  @retval EFI_WRITE_PROTECTED     The device cannot be erased due to write
                                  protection.
  @retval EFI_DEVICE_ERROR        The device reported an error while attempting
                                  to perform the erase operation.
  @retval EFI_INVALID_PARAMETER   The erase request contains LBAs that are not
                                  valid.
  @retval EFI_NO_MEDIA            There is no media in the device.
  @retval EFI_MEDIA_CHANGED       The MediaId is not for the current media.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_ERASE) (
  IN     EFI_ERASE_BLOCK_PROTOCOL      *This,
  IN     UINT32                        MediaId,
  IN     EFI_LBA                       LBA,
  IN OUT EFI_ERASE_BLOCK_TOKEN         *Token,
  IN     UINTN                         Size
  );

///
/// The EFI Erase Block Protocol provides the ability for a device to expose
/// erase functionality. This optional protocol is installed on the same handle
/// as the EFI_BLOCK_IO_PROTOCOL or EFI_BLOCK_IO2_PROTOCOL.
///
struct _EFI_ERASE_BLOCK_PROTOCOL {
  //
  // The revision to which the EFI_ERASE_BLOCK_PROTOCOL adheres. All future
  // revisions must be backwards compatible. If a future version is not
  // backwards compatible, it is not the same GUID.
  //
  UINT64                     Revision;
  //
  // Returns the erase length granularity as a number of logical blocks. A
  // value of 1 means the erase granularity is one logical block.
  //
  UINT32                     EraseLengthGranularity;
  EFI_BLOCK_ERASE            EraseBlocks;
};

extern EFI_GUID gEfiEraseBlockProtocolGuid;

#endif