2 Block IO protocol as defined in the EFI 1.0 specification.
4 The Block IO protocol is used to abstract block devices like hard drives,
5 DVD-ROMs and floppy drives.
7 Copyright (c) 2006, Intel Corporation
8 All rights reserved. This program and the accompanying materials
9 are licensed and made available under the terms and conditions of the BSD License
10 which accompanies this distribution. The full text of the license may be found at
11 http://opensource.org/licenses/bsd-license.php
13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 #ifndef __BLOCK_IO_H__
19 #define __BLOCK_IO_H__
21 #define EFI_BLOCK_IO_PROTOCOL_GUID \
23 0x964e5b21, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
26 typedef struct _EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL
;
29 // Protocol GUID name defined in EFI1.1.
31 #define BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL_GUID
34 // Protocol defined in EFI1.1.
36 typedef EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO
;
39 Reset the Block Device.
41 @param This Protocol instance pointer.
42 @param ExtendedVerification Driver may perform diagnostics on reset.
44 @retval EFI_SUCCESS The device was reset.
45 @retval EFI_DEVICE_ERROR The device is not functioning properly and could
51 (EFIAPI
*EFI_BLOCK_RESET
) (
52 IN EFI_BLOCK_IO_PROTOCOL
*This
,
53 IN BOOLEAN ExtendedVerification
58 Read BufferSize bytes from Lba into Buffer.
60 @param This Protocol instance pointer.
61 @param MediaId Id of the media, changes every time the media is replaced.
62 @param Lba The starting Logical Block Address to read from
63 @param BufferSize Size of Buffer, must be a multiple of device block size.
64 @param Buffer Buffer containing read data
66 @retval EFI_SUCCESS The data was read correctly from the device.
67 @retval EFI_DEVICE_ERROR The device reported an error while performing the read.
68 @retval EFI_NO_MEDIA There is no media in the device.
69 @retval EFI_MEDIA_CHANGED The MediaId does not matched the current device.
70 @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
71 @retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
77 (EFIAPI
*EFI_BLOCK_READ
) (
78 IN EFI_BLOCK_IO_PROTOCOL
*This
,
87 Write BufferSize bytes from Lba into Buffer.
89 @param This Protocol instance pointer.
90 @param MediaId Id of the media, changes every time the media is replaced.
91 @param Lba The starting Logical Block Address to read from
92 @param BufferSize Size of Buffer, must be a multiple of device block size.
93 @param Buffer Buffer containing read data
95 @retval EFI_SUCCESS The data was written correctly to the device.
96 @retval EFI_WRITE_PROTECTED The device can not be written to.
97 @retval EFI_DEVICE_ERROR The device reported an error while performing the write.
98 @retval EFI_NO_MEDIA There is no media in the device.
99 @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
100 @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
101 @retval EFI_INVALID_PARAMETER The write request contains a LBA that is not
102 valid for the device.
107 (EFIAPI
*EFI_BLOCK_WRITE
) (
108 IN EFI_BLOCK_IO_PROTOCOL
*This
,
117 Flush the Block Device.
119 @param This Protocol instance pointer.
121 @retval EFI_SUCCESS All outstanding data was written to the device
122 @retval EFI_DEVICE_ERROR The device reported an error while writting back the data
123 @retval EFI_NO_MEDIA There is no media in the device.
128 (EFIAPI
*EFI_BLOCK_FLUSH
) (
129 IN EFI_BLOCK_IO_PROTOCOL
*This
134 Block IO read only mode data and updated only via members of BlockIO
138 UINT32 MediaId
; ///< The curent media Id. If the media changes, this value is changed.
139 BOOLEAN RemovableMedia
; ///< TRUE if the media is removable; otherwise, FALSE.
140 BOOLEAN MediaPresent
; /**< TRUE if there is a media currently present in the device;
141 othersise, FALSE. THis field shows the media present status
142 as of the most recent ReadBlocks() or WriteBlocks() call.
144 BOOLEAN LogicalPartition
; /**< TRUE if LBA 0 is the first block of a partition; otherwise
145 FALSE. For media with only one partition this would be TRUE.
147 BOOLEAN ReadOnly
; /**< TRUE if the media is marked read-only otherwise, FALSE.
148 This field shows the read-only status as of the most recent WriteBlocks () call.
150 BOOLEAN WriteCaching
; ///< TRUE if the WriteBlock () function caches write data.
152 UINT32 BlockSize
; /**< The intrinsic block size of the device. If the media changes, then
153 this field is updated.
155 UINT32 IoAlign
; ///< Supplies the alignment requirement for any buffer to read or write block(s).
157 EFI_LBA LastBlock
; /**< The last logical block address on the device.
158 If the media changes, then this field is updated.
160 } EFI_BLOCK_IO_MEDIA
;
162 #define EFI_BLOCK_IO_PROTOCOL_REVISION 0x00010000
164 // Revision defined in EFI1.1.
166 #define EFI_BLOCK_IO_INTERFACE_REVISION EFI_BLOCK_IO_PROTOCOL_REVISION
168 struct _EFI_BLOCK_IO_PROTOCOL
{
171 EFI_BLOCK_IO_MEDIA
*Media
;
173 EFI_BLOCK_RESET Reset
;
174 EFI_BLOCK_READ ReadBlocks
;
175 EFI_BLOCK_WRITE WriteBlocks
;
176 EFI_BLOCK_FLUSH FlushBlocks
;
180 extern EFI_GUID gEfiBlockIoProtocolGuid
;