2 Block IO protocol as defined in the UEFI 2.0 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 - 2011, Intel Corporation. All rights reserved.<BR>
8 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 FILE_LICENCE ( BSD3 );
23 #define EFI_BLOCK_IO_PROTOCOL_GUID \
25 0x964e5b21, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
28 typedef struct _EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL;
31 /// Protocol GUID name defined in EFI1.1.
33 #define BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL_GUID
36 /// Protocol defined in EFI1.1.
38 typedef EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO;
41 Reset the Block Device.
43 @param This Indicates a pointer to the calling context.
44 @param ExtendedVerification Driver may perform diagnostics on reset.
46 @retval EFI_SUCCESS The device was reset.
47 @retval EFI_DEVICE_ERROR The device is not functioning properly and could
53 (EFIAPI *EFI_BLOCK_RESET)(
54 IN EFI_BLOCK_IO_PROTOCOL *This,
55 IN BOOLEAN ExtendedVerification
59 Read BufferSize bytes from Lba into Buffer.
61 @param This Indicates a pointer to the calling context.
62 @param MediaId Id of the media, changes every time the media is replaced.
63 @param Lba The starting Logical Block Address to read from
64 @param BufferSize Size of Buffer, must be a multiple of device block size.
65 @param Buffer A pointer to the destination buffer for the data. The caller is
66 responsible for either having implicit or explicit ownership of the buffer.
68 @retval EFI_SUCCESS The data was read correctly from the device.
69 @retval EFI_DEVICE_ERROR The device reported an error while performing the read.
70 @retval EFI_NO_MEDIA There is no media in the device.
71 @retval EFI_MEDIA_CHANGED The MediaId does not matched the current device.
72 @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
73 @retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,
74 or the buffer is not on proper alignment.
79 (EFIAPI *EFI_BLOCK_READ)(
80 IN EFI_BLOCK_IO_PROTOCOL *This,
88 Write BufferSize bytes from Lba into Buffer.
90 @param This Indicates a pointer to the calling context.
91 @param MediaId The media ID that the write request is for.
92 @param Lba The starting logical block address to be written. The caller is
93 responsible for writing to only legitimate locations.
94 @param BufferSize Size of Buffer, must be a multiple of device block size.
95 @param Buffer A pointer to the source buffer for the data.
97 @retval EFI_SUCCESS The data was written correctly to the device.
98 @retval EFI_WRITE_PROTECTED The device can not be written to.
99 @retval EFI_DEVICE_ERROR The device reported an error while performing the write.
100 @retval EFI_NO_MEDIA There is no media in the device.
101 @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
102 @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
103 @retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,
104 or the buffer is not on proper alignment.
109 (EFIAPI *EFI_BLOCK_WRITE)(
110 IN EFI_BLOCK_IO_PROTOCOL *This,
118 Flush the Block Device.
120 @param This Indicates a pointer to the calling context.
122 @retval EFI_SUCCESS All outstanding data was written to the device
123 @retval EFI_DEVICE_ERROR The device reported an error while writting back the data
124 @retval EFI_NO_MEDIA There is no media in the device.
129 (EFIAPI *EFI_BLOCK_FLUSH)(
130 IN EFI_BLOCK_IO_PROTOCOL *This
134 Block IO read only mode data and updated only via members of BlockIO
138 /// The curent media Id. If the media changes, this value is changed.
143 /// TRUE if the media is removable; otherwise, FALSE.
145 BOOLEAN RemovableMedia;
148 /// TRUE if there is a media currently present in the device;
149 /// othersise, FALSE. THis field shows the media present status
150 /// as of the most recent ReadBlocks() or WriteBlocks() call.
152 BOOLEAN MediaPresent;
155 /// TRUE if LBA 0 is the first block of a partition; otherwise
156 /// FALSE. For media with only one partition this would be TRUE.
158 BOOLEAN LogicalPartition;
161 /// TRUE if the media is marked read-only otherwise, FALSE.
162 /// This field shows the read-only status as of the most recent WriteBlocks () call.
167 /// TRUE if the WriteBlock () function caches write data.
169 BOOLEAN WriteCaching;
172 /// The intrinsic block size of the device. If the media changes, then
173 /// this field is updated.
178 /// Supplies the alignment requirement for any buffer to read or write block(s).
183 /// The last logical block address on the device.
184 /// If the media changes, then this field is updated.
189 /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
190 /// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the first LBA is aligned to
191 /// a physical block boundary.
193 EFI_LBA LowestAlignedLba;
196 /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
197 /// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the number of logical blocks
198 /// per physical block.
200 UINT32 LogicalBlocksPerPhysicalBlock;
203 /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
204 /// EFI_BLOCK_IO_PROTOCOL_REVISION3. Returns the optimal transfer length
205 /// granularity as a number of logical blocks.
207 UINT32 OptimalTransferLengthGranularity;
208 } EFI_BLOCK_IO_MEDIA;
210 #define EFI_BLOCK_IO_PROTOCOL_REVISION 0x00010000
211 #define EFI_BLOCK_IO_PROTOCOL_REVISION2 0x00020001
212 #define EFI_BLOCK_IO_PROTOCOL_REVISION3 0x00020031
215 /// Revision defined in EFI1.1.
217 #define EFI_BLOCK_IO_INTERFACE_REVISION EFI_BLOCK_IO_PROTOCOL_REVISION
220 /// This protocol provides control over block devices.
222 struct _EFI_BLOCK_IO_PROTOCOL {
224 /// The revision to which the block IO interface adheres. All future
225 /// revisions must be backwards compatible. If a future version is not
226 /// back wards compatible, it is not the same GUID.
230 /// Pointer to the EFI_BLOCK_IO_MEDIA data for this device.
232 EFI_BLOCK_IO_MEDIA *Media;
234 EFI_BLOCK_RESET Reset;
235 EFI_BLOCK_READ ReadBlocks;
236 EFI_BLOCK_WRITE WriteBlocks;
237 EFI_BLOCK_FLUSH FlushBlocks;
241 extern EFI_GUID gEfiBlockIoProtocolGuid;