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/** @file
Block IO protocol as defined in the EFI 1.0 specification.
The Block IO protocol is used to abstract block devices like hard drives,
DVD-ROMs and floppy drives.
Copyright (c) 2006, 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: BlockIo.h
**/
#ifndef __BLOCK_IO_H__
#define __BLOCK_IO_H__
#define EFI_BLOCK_IO_PROTOCOL_GUID \
{ \
0x964e5b21, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
}
//
// Forward reference for pure ANSI compatability
//
typedef struct _EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL;
/**
Reset the Block Device.
@param This Protocol instance pointer.
@param ExtendedVerification Driver may perform diagnostics on 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) (
IN EFI_BLOCK_IO_PROTOCOL *This,
IN BOOLEAN ExtendedVerification
)
;
/**
Read BufferSize bytes from Lba into Buffer.
@param This Protocol instance pointer.
@param MediaId Id of the media, changes every time the media is replaced.
@param Lba The starting Logical Block Address to read from
@param BufferSize Size of Buffer, must be a multiple of device block size.
@param Buffer Buffer containing read data
@retval EFI_SUCCESS The data was read correctly from the device.
@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 does not matched the current device.
@retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
@retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
valid for the device.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_READ) (
IN EFI_BLOCK_IO_PROTOCOL *This,
IN UINT32 MediaId,
IN EFI_LBA Lba,
IN UINTN BufferSize,
OUT VOID *Buffer
)
;
/**
Write BufferSize bytes from Lba into Buffer.
@param This Protocol instance pointer.
@param MediaId Id of the media, changes every time the media is replaced.
@param Lba The starting Logical Block Address to read from
@param BufferSize Size of Buffer, must be a multiple of device block size.
@param Buffer Buffer containing read data
@retval EFI_SUCCESS The data was written correctly to the device.
@retval EFI_WRITE_PROTECTED The device can not be written to.
@retval EFI_DEVICE_ERROR The device reported an error while performing the write.
@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_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
@retval EFI_INVALID_PARAMETER The write request contains a LBA that is not
valid for the device.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_WRITE) (
IN EFI_BLOCK_IO_PROTOCOL *This,
IN UINT32 MediaId,
IN EFI_LBA Lba,
IN UINTN BufferSize,
IN VOID *Buffer
)
;
/**
Flush the Block Device.
@param This Protocol instance pointer.
@retval EFI_SUCCESS All outstanding data was written to the device
@retval EFI_DEVICE_ERROR The device reported an error while writting back the data
@retval EFI_NO_MEDIA There is no media in the device.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_FLUSH) (
IN EFI_BLOCK_IO_PROTOCOL *This
)
;
/**
Block IO read only mode data and updated only via members of BlockIO
**/
typedef struct {
UINT32 MediaId; ///< The curent media Id. If the media changes, this value is changed.
BOOLEAN RemovableMedia; ///< TRUE if the media is removable; otherwise, FALSE.
BOOLEAN MediaPresent; /**< TRUE if there is a media currently present in the device;
othersise, FALSE. THis field shows the media present status
as of the most recent ReadBlocks() or WriteBlocks() call.
**/
BOOLEAN LogicalPartition; /**< TRUE if LBA 0 is the first block of a partition; otherwise
FALSE. For media with only one partition this would be TRUE.
**/
BOOLEAN ReadOnly; /**< TRUE if the media is marked read-only otherwise, FALSE.
This field shows the read-only status as of the most recent WriteBlocks () call.
**/
BOOLEAN WriteCaching; ///< TRUE if the WriteBlock () function caches write data.
UINT32 BlockSize; /**< The intrinsic block size of the device. If the media changes, then
this field is updated.
**/
UINT32 IoAlign; ///< Supplies the alignment requirement for any buffer to read or write block(s).
EFI_LBA LastBlock; /**< The last logical block address on the device.
If the media changes, then this field is updated.
**/
} EFI_BLOCK_IO_MEDIA;
#define EFI_BLOCK_IO_PROTOCOL_REVISION 0x00010000
struct _EFI_BLOCK_IO_PROTOCOL {
UINT64 Revision;
EFI_BLOCK_IO_MEDIA *Media;
EFI_BLOCK_RESET Reset;
EFI_BLOCK_READ ReadBlocks;
EFI_BLOCK_WRITE WriteBlocks;
EFI_BLOCK_FLUSH FlushBlocks;
};
extern EFI_GUID gEfiBlockIoProtocolGuid;
#endif
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