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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7998 6f19259b-4bc3-4df7-8a09-765794883524
234 lines
7.8 KiB
C
234 lines
7.8 KiB
C
/** @file
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Block IO protocol as defined in the UEFI 2.0 specification.
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The Block IO protocol is used to abstract block devices like hard drives,
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DVD-ROMs and floppy drives.
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Copyright (c) 2006 - 2008, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __BLOCK_IO_H__
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#define __BLOCK_IO_H__
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#define EFI_BLOCK_IO_PROTOCOL_GUID \
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{ \
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0x964e5b21, 0x6459, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
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}
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typedef struct _EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL;
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///
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/// Protocol GUID name defined in EFI1.1.
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///
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#define BLOCK_IO_PROTOCOL EFI_BLOCK_IO_PROTOCOL_GUID
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///
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/// Protocol defined in EFI1.1.
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///
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typedef EFI_BLOCK_IO_PROTOCOL EFI_BLOCK_IO;
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/**
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Reset the Block Device.
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@param This Indicates a pointer to the calling context.
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@param ExtendedVerification Driver may perform diagnostics on reset.
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@retval EFI_SUCCESS The device was reset.
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@retval EFI_DEVICE_ERROR The device is not functioning properly and could
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not be reset.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_BLOCK_RESET)(
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IN EFI_BLOCK_IO_PROTOCOL *This,
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IN BOOLEAN ExtendedVerification
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);
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/**
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Read BufferSize bytes from Lba into Buffer.
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@param This Indicates a pointer to the calling context.
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@param MediaId Id of the media, changes every time the media is replaced.
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@param Lba The starting Logical Block Address to read from
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@param BufferSize Size of Buffer, must be a multiple of device block size.
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@param Buffer A pointer to the destination buffer for the data. The caller is
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responsible for either having implicit or explicit ownership of the buffer.
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@retval EFI_SUCCESS The data was read correctly from the device.
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@retval EFI_DEVICE_ERROR The device reported an error while performing the read.
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@retval EFI_NO_MEDIA There is no media in the device.
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@retval EFI_MEDIA_CHANGED The MediaId does not matched the current device.
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@retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
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@retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,
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or the buffer is not on proper alignment.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_BLOCK_READ)(
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IN EFI_BLOCK_IO_PROTOCOL *This,
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IN UINT32 MediaId,
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IN EFI_LBA Lba,
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IN UINTN BufferSize,
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OUT VOID *Buffer
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);
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/**
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Write BufferSize bytes from Lba into Buffer.
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@param This Indicates a pointer to the calling context.
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@param MediaId The media ID that the write request is for.
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@param Lba The starting logical block address to be written. The caller is
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responsible for writing to only legitimate locations.
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@param BufferSize Size of Buffer, must be a multiple of device block size.
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@param Buffer A pointer to the source buffer for the data.
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@retval EFI_SUCCESS The data was written correctly to the device.
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@retval EFI_WRITE_PROTECTED The device can not be written to.
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@retval EFI_DEVICE_ERROR The device reported an error while performing the write.
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@retval EFI_NO_MEDIA There is no media in the device.
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@retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
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@retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.
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@retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,
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or the buffer is not on proper alignment.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_BLOCK_WRITE)(
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IN EFI_BLOCK_IO_PROTOCOL *This,
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IN UINT32 MediaId,
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IN EFI_LBA Lba,
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IN UINTN BufferSize,
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IN VOID *Buffer
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);
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/**
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Flush the Block Device.
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@param This Indicates a pointer to the calling context.
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@retval EFI_SUCCESS All outstanding data was written to the device
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@retval EFI_DEVICE_ERROR The device reported an error while writting back the data
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@retval EFI_NO_MEDIA There is no media in the device.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_BLOCK_FLUSH)(
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IN EFI_BLOCK_IO_PROTOCOL *This
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);
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/**
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Block IO read only mode data and updated only via members of BlockIO
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**/
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typedef struct {
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///
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/// The curent media Id. If the media changes, this value is changed.
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///
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UINT32 MediaId;
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///
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/// TRUE if the media is removable; otherwise, FALSE.
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///
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BOOLEAN RemovableMedia;
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///
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/// TRUE if there is a media currently present in the device;
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/// othersise, FALSE. THis field shows the media present status
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/// as of the most recent ReadBlocks() or WriteBlocks() call.
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///
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BOOLEAN MediaPresent;
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///
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/// TRUE if LBA 0 is the first block of a partition; otherwise
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/// FALSE. For media with only one partition this would be TRUE.
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///
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BOOLEAN LogicalPartition;
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///
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/// TRUE if the media is marked read-only otherwise, FALSE.
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/// This field shows the read-only status as of the most recent WriteBlocks () call.
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///
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BOOLEAN ReadOnly;
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///
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/// TRUE if the WriteBlock () function caches write data.
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///
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BOOLEAN WriteCaching;
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///
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/// The intrinsic block size of the device. If the media changes, then
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/// this field is updated.
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///
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UINT32 BlockSize;
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///
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/// Supplies the alignment requirement for any buffer to read or write block(s).
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///
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UINT32 IoAlign;
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///
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/// The last logical block address on the device.
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/// If the media changes, then this field is updated.
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///
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EFI_LBA LastBlock;
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///
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/// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
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/// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the first LBA is aligned to
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/// a physical block boundary.
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///
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EFI_LBA LowestAlignedLba;
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///
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/// Only present if EFI_BLOCK_IO_PROTOCOL.Revision is greater than or equal to
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/// EFI_BLOCK_IO_PROTOCOL_REVISION2. Returns the number of logical blocks
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/// per physical block.
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///
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UINT32 LogicalBlocksPerPhysicalBlock;
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} EFI_BLOCK_IO_MEDIA;
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#define EFI_BLOCK_IO_PROTOCOL_REVISION 0x00010000
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#define EFI_BLOCK_IO_PROTOCOL_REVISION2 0x00020001
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///
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/// Revision defined in EFI1.1.
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///
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#define EFI_BLOCK_IO_INTERFACE_REVISION EFI_BLOCK_IO_PROTOCOL_REVISION
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///
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/// This protocol provides control over block devices.
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///
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struct _EFI_BLOCK_IO_PROTOCOL {
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///
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/// The revision to which the block IO interface adheres. All future
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/// revisions must be backwards compatible. If a future version is not
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/// back wards compatible, it is not the same GUID.
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///
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UINT64 Revision;
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///
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/// Pointer to the EFI_BLOCK_IO_MEDIA data for this device.
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///
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EFI_BLOCK_IO_MEDIA *Media;
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EFI_BLOCK_RESET Reset;
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EFI_BLOCK_READ ReadBlocks;
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EFI_BLOCK_WRITE WriteBlocks;
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EFI_BLOCK_FLUSH FlushBlocks;
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};
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extern EFI_GUID gEfiBlockIoProtocolGuid;
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#endif
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