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/** @file
Disk IO protocol as defined in the UEFI 2.0 specification.
The Disk IO protocol is used to convert block oriented devices into byte
oriented devices. The Disk IO protocol is intended to layer on top of the
Block IO protocol.
Copyright (c) 2006 - 2008, 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.
**/
#ifndef __DISK_IO_H__
#define __DISK_IO_H__
#define EFI_DISK_IO_PROTOCOL_GUID \
{ \
0xce345171, 0xba0b, 0x11d2, {0x8e, 0x4f, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
}
///
/// Protocol GUID name defined in EFI1.1.
///
#define DISK_IO_PROTOCOL EFI_DISK_IO_PROTOCOL_GUID
typedef struct _EFI_DISK_IO_PROTOCOL EFI_DISK_IO_PROTOCOL;
///
/// Protocol defined in EFI1.1.
///
typedef EFI_DISK_IO_PROTOCOL EFI_DISK_IO;
/**
Read BufferSize bytes from Offset into Buffer.
@param This Protocol instance pointer.
@param MediaId Id of the media, changes every time the media is replaced.
@param Offset The starting byte offset to read from
@param BufferSize Size of Buffer
@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_CHNAGED The MediaId does not matched the current device.
@retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
valid for the device.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_READ)(
IN EFI_DISK_IO_PROTOCOL *This,
IN UINT32 MediaId,
IN UINT64 Offset,
IN UINTN BufferSize,
OUT VOID *Buffer
);
/**
Writes a specified number of bytes to a device.
@param This Indicates a pointer to the calling context.
@param MediaId ID of the medium to be written.
@param Offset The starting byte offset on the logical block I/O device to write.
@param BufferSize The size in bytes of Buffer. The number of bytes to write to the device.
@param Buffer A pointer to the buffer containing the data to be written.
@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_INVALID_PARAMETER The write request contains device addresses that are not
valid for the device.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_WRITE)(
IN EFI_DISK_IO_PROTOCOL *This,
IN UINT32 MediaId,
IN UINT64 Offset,
IN UINTN BufferSize,
IN VOID *Buffer
);
#define EFI_DISK_IO_PROTOCOL_REVISION 0x00010000
///
/// Revision defined in EFI1.1
///
#define EFI_DISK_IO_INTERFACE_REVISION EFI_DISK_IO_PROTOCOL_REVISION
///
/// This protocol is used to abstract Block I/O interfaces.
///
struct _EFI_DISK_IO_PROTOCOL {
///
/// The revision to which the disk I/O interface adheres. All future
/// revisions must be backwards compatible. If a future version is not
/// backwards compatible, it is not the same GUID.
///
UINT64 Revision;
EFI_DISK_READ ReadDisk;
EFI_DISK_WRITE WriteDisk;
};
extern EFI_GUID gEfiDiskIoProtocolGuid;
#endif
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