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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:
BlockIo.h
Abstract:
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.
--*/
#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
//
EFI_FORWARD_DECLARATION (EFI_BLOCK_IO_PROTOCOL);
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_RESET) (
IN EFI_BLOCK_IO_PROTOCOL * This,
IN BOOLEAN ExtendedVerification
)
/*++
Routine Description:
Reset the Block Device.
Arguments:
This - Protocol instance pointer.
ExtendedVerification - Driver may perform diagnostics on reset.
Returns:
EFI_SUCCESS - The device was reset.
EFI_DEVICE_ERROR - The device is not functioning properly and could
not be reset.
--*/
;
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
)
/*++
Routine Description:
Read BufferSize bytes from Lba into Buffer.
Arguments:
This - Protocol instance pointer.
MediaId - Id of the media, changes every time the media is replaced.
Lba - The starting Logical Block Address to read from
BufferSize - Size of Buffer, must be a multiple of device block size.
Buffer - Buffer containing read data
Returns:
EFI_SUCCESS - The data was read correctly from the device.
EFI_DEVICE_ERROR - The device reported an error while performing the read.
EFI_NO_MEDIA - There is no media in the device.
EFI_MEDIA_CHANGED - The MediaId does not matched the current device.
EFI_BAD_BUFFER_SIZE - The Buffer was not a multiple of the block size of the
device.
EFI_INVALID_PARAMETER - The read request contains device addresses that are 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
)
/*++
Routine Description:
Write BufferSize bytes from Lba into Buffer.
Arguments:
This - Protocol instance pointer.
MediaId - Id of the media, changes every time the media is replaced.
Lba - The starting Logical Block Address to read from
BufferSize - Size of Buffer, must be a multiple of device block size.
Buffer - Buffer containing read data
Returns:
EFI_SUCCESS - The data was written correctly to the device.
EFI_WRITE_PROTECTED - The device can not be written to.
EFI_DEVICE_ERROR - The device reported an error while performing the write.
EFI_NO_MEDIA - There is no media in the device.
EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.
EFI_BAD_BUFFER_SIZE - The Buffer was not a multiple of the block size of the
device.
EFI_INVALID_PARAMETER - The write request contains a LBA that is not
valid for the device.
--*/
;
typedef
EFI_STATUS
(EFIAPI *EFI_BLOCK_FLUSH) (
IN EFI_BLOCK_IO_PROTOCOL * This
)
/*++
Routine Description:
Flush the Block Device.
Arguments:
This - Protocol instance pointer.
Returns:
EFI_SUCCESS - All outstanding data was written to the device
EFI_DEVICE_ERROR - The device reported an error while writting back the data
EFI_NO_MEDIA - There is no media in the device.
--*/
;
/*++
Block IO read only mode data and updated only via members of BlockIO
MediaId - The curent media Id. If the media changes, this value is changed.
RemovableMedia - TRUE if the media is removable; otherwise, FALSE.
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.
LogicalPartition - TRUE if LBA 0 is the first block of a partition; otherwise
FALSE. For media with only one partition this would be TRUE.
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.
WriteCaching - TRUE if the WriteBlock () function caches write data.
BlockSize - The intrinsic block size of the device. If the media changes, then
this field is updated.
IoAlign - Supplies the alignment requirement for any buffer to read or write
block(s).
LastBlock - The last logical block address on the device. If the media changes,
then this field is updated.
--*/
typedef struct {
UINT32 MediaId;
BOOLEAN RemovableMedia;
BOOLEAN MediaPresent;
BOOLEAN LogicalPartition;
BOOLEAN ReadOnly;
BOOLEAN WriteCaching;
UINT32 BlockSize;
UINT32 IoAlign;
EFI_LBA LastBlock;
} EFI_BLOCK_IO_MEDIA;
#define EFI_BLOCK_IO_PROTOCOL_REVISION 0x00010000
typedef 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;
} EFI_BLOCK_IO_PROTOCOL;
extern EFI_GUID gEfiBlockIoProtocolGuid;
#endif
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