MdePkg/Include/Protocol/BlockIo.h

   1 /** @file
   2   Block IO protocol as defined in the UEFI 2.0 specification.
   3
   4   The Block IO protocol is used to abstract block devices like hard drives,
   5   DVD-ROMs and floppy drives.
   6
   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
  12
  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.
  15
  16 **/
  17
  18 #ifndef __BLOCK_IO_H__
  19 #define __BLOCK_IO_H__
  20
  21 #define EFI_BLOCK_IO_PROTOCOL_GUID \
  22   { \
  23     0x964e5b21, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  24   }
  25
  26 typedef struct _EFI_BLOCK_IO_PROTOCOL  EFI_BLOCK_IO_PROTOCOL;
  27
  28 ///
  29 /// Protocol GUID name defined in EFI1.1.
  30 ///
  31 #define BLOCK_IO_PROTOCOL       EFI_BLOCK_IO_PROTOCOL_GUID
  32
  33 ///
  34 /// Protocol defined in EFI1.1.
  35 ///
  36 typedef EFI_BLOCK_IO_PROTOCOL   EFI_BLOCK_IO;
  37
  38 /**
  39   Reset the Block Device.
  40
  41   @param  This                 Indicates a pointer to the calling context.
  42   @param  ExtendedVerification Driver may perform diagnostics on reset.
  43
  44   @retval EFI_SUCCESS          The device was reset.
  45   @retval EFI_DEVICE_ERROR     The device is not functioning properly and could
  46                                not be reset.
  47
  48 **/
  49 typedef
  50 EFI_STATUS
  51 (EFIAPI *EFI_BLOCK_RESET)(
  52   IN EFI_BLOCK_IO_PROTOCOL          *This,
  53   IN BOOLEAN                        ExtendedVerification
  54   );
  55
  56 /**
  57   Read BufferSize bytes from Lba into Buffer.
  58
  59   @param  This       Indicates a pointer to the calling context.
  60   @param  MediaId    Id of the media, changes every time the media is replaced.
  61   @param  Lba        The starting Logical Block Address to read from
  62   @param  BufferSize Size of Buffer, must be a multiple of device block size.
  63   @param  Buffer     A pointer to the destination buffer for the data. The caller is
  64                      responsible for either having implicit or explicit ownership of the buffer.
  65
  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 LBAs that are not valid,
  72                                 or the buffer is not on proper alignment.
  73
  74 **/
  75 typedef
  76 EFI_STATUS
  77 (EFIAPI *EFI_BLOCK_READ)(
  78   IN EFI_BLOCK_IO_PROTOCOL          *This,
  79   IN UINT32                         MediaId,
  80   IN EFI_LBA                        Lba,
  81   IN UINTN                          BufferSize,
  82   OUT VOID                          *Buffer
  83   );
  84
  85 /**
  86   Write BufferSize bytes from Lba into Buffer.
  87
  88   @param  This       Indicates a pointer to the calling context.
  89   @param  MediaId    The media ID that the write request is for.
  90   @param  Lba        The starting logical block address to be written. The caller is
  91                      responsible for writing to only legitimate locations.
  92   @param  BufferSize Size of Buffer, must be a multiple of device block size.
  93   @param  Buffer     A pointer to the source buffer for the data.
  94
  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 LBAs that are not valid,
 102                                 or the buffer is not on proper alignment.
 103
 104 **/
 105 typedef
 106 EFI_STATUS
 107 (EFIAPI *EFI_BLOCK_WRITE)(
 108   IN EFI_BLOCK_IO_PROTOCOL          *This,
 109   IN UINT32                         MediaId,
 110   IN EFI_LBA                        Lba,
 111   IN UINTN                          BufferSize,
 112   IN VOID                           *Buffer
 113   );
 114
 115 /**
 116   Flush the Block Device.
 117
 118   @param  This              Indicates a pointer to the calling context.
 119
 120   @retval EFI_SUCCESS       All outstanding data was written to the device
 121   @retval EFI_DEVICE_ERROR  The device reported an error while writting back the data
 122   @retval EFI_NO_MEDIA      There is no media in the device.
 123
 124 **/
 125 typedef
 126 EFI_STATUS
 127 (EFIAPI *EFI_BLOCK_FLUSH)(
 128   IN EFI_BLOCK_IO_PROTOCOL  *This
 129   );
 130
 131 /**
 132   Block IO read only mode data and updated only via members of BlockIO
 133 **/
 134 typedef struct {
 135   ///
 136   /// The curent media Id. If the media changes, this value is changed.
 137   ///
 138   UINT32  MediaId;
 139
 140   ///
 141   /// TRUE if the media is removable; otherwise, FALSE.
 142   ///
 143   BOOLEAN RemovableMedia;
 144
 145   ///
 146   /// TRUE if there is a media currently present in the device;
 147   /// othersise, FALSE. THis field shows the media present status
 148   /// as of the most recent ReadBlocks() or WriteBlocks() call.
 149   ///
 150   BOOLEAN MediaPresent;
 151
 152   ///
 153   /// TRUE if LBA 0 is the first block of a partition; otherwise
 154   /// FALSE. For media with only one partition this would be TRUE.
 155   ///
 156   BOOLEAN LogicalPartition;
 157
 158   ///
 159   /// TRUE if the media is marked read-only otherwise, FALSE.
 160   /// This field shows the read-only status as of the most recent WriteBlocks () call.
 161   ///
 162   BOOLEAN ReadOnly;
 163
 164   ///
 165   /// TRUE if the WriteBlock () function caches write data.
 166   ///
 167   BOOLEAN WriteCaching;
 168
 169   ///
 170   /// The intrinsic block size of the device. If the media changes, then
 171   /// this field is updated.
 172   ///
 173   UINT32  BlockSize;
 174
 175   ///
 176   /// Supplies the alignment requirement for any buffer to read or write block(s).
 177   ///
 178   UINT32  IoAlign;
 179
 180   ///
 181   /// The last logical block address on the device.
 182   /// If the media changes, then this field is updated.
 183   ///
 184   EFI_LBA LastBlock;
 185
 186   ///
 187   /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
 188   /// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the first LBA is aligned to
 189   /// a physical block boundary.
 190   ///
 191   EFI_LBA LowestAlignedLba;
 192
 193   ///
 194   /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
 195   /// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the number of logical blocks
 196   /// per physical block.
 197   ///
 198   UINT32 LogicalBlocksPerPhysicalBlock;
 199
 200   ///
 201   /// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
 202   /// EFI_BLOCK_IO_PROTOCOL_REVISION3. Returns the optimal transfer length
 203   /// granularity as a number of logical blocks.
 204   ///
 205   UINT32 OptimalTransferLengthGranularity;
 206 } EFI_BLOCK_IO_MEDIA;
 207
 208 #define EFI_BLOCK_IO_PROTOCOL_REVISION  0x00010000
 209 #define EFI_BLOCK_IO_PROTOCOL_REVISION2 0x00020001
 210 #define EFI_BLOCK_IO_PROTOCOL_REVISION3 0x00020031
 211
 212 ///
 213 /// Revision defined in EFI1.1.
 214 ///
 215 #define EFI_BLOCK_IO_INTERFACE_REVISION   EFI_BLOCK_IO_PROTOCOL_REVISION
 216
 217 ///
 218 ///  This protocol provides control over block devices.
 219 ///
 220 struct _EFI_BLOCK_IO_PROTOCOL {
 221   ///
 222   /// The revision to which the block IO interface adheres. All future
 223   /// revisions must be backwards compatible. If a future version is not
 224   /// back wards compatible, it is not the same GUID.
 225   ///
 226   UINT64              Revision;
 227   ///
 228   /// Pointer to the EFI_BLOCK_IO_MEDIA data for this device.
 229   ///
 230   EFI_BLOCK_IO_MEDIA  *Media;
 231
 232   EFI_BLOCK_RESET     Reset;
 233   EFI_BLOCK_READ      ReadBlocks;
 234   EFI_BLOCK_WRITE     WriteBlocks;
 235   EFI_BLOCK_FLUSH     FlushBlocks;
 236
 237 };
 238
 239 extern EFI_GUID gEfiBlockIoProtocolGuid;
 240
 241 #endif