mirror of https://github.com/acidanthera/audk.git
234 lines
10 KiB
C
234 lines
10 KiB
C
/** @file
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Provides the services required to access a block I/O device during PEI recovery
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boot mode.
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The Recovery Module PPI and the Device Recovery Module PPI are device neutral.
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This PPI is device specific and addresses the most common form of recovery
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media-block I/O devices such as legacy floppy, CD-ROM, or IDE devices.
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The Recovery Block I/O PPI is used to access block devices. Because the Recovery
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Block I/O PPIs that are provided by the PEI ATAPI driver and PEI legacy floppy
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driver are the same, here we define a set of general PPIs for both drivers to use.
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Copyright (c) 2007 - 2009, 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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@par Revision Reference:
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This PPI is defined in UEFI Platform Initialization Specification 1.2 Volume 1:
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Pre-EFI Initalization Core Interface
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**/
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#ifndef _PEI_BLOCK_IO_H_
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#define _PEI_BLOCK_IO_H_
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///
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/// Global ID for EFI_PEI_RECOVERY_BLOCK_IO_PPI
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///
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#define EFI_PEI_RECOVERY_BLOCK_IO_PPI_GUID \
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{ \
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0x695d8aa1, 0x42ee, 0x4c46, { 0x80, 0x5c, 0x6e, 0xa6, 0xbc, 0xe7, 0x99, 0xe3 } \
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}
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///
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/// Forward declaration for EFI_PEI_RECOVERY_BLOCK_IO_PPI
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///
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typedef struct _EFI_PEI_RECOVERY_BLOCK_IO_PPI EFI_PEI_RECOVERY_BLOCK_IO_PPI;
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///
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/// All blocks on the recovery device are addressed with a 64-bit Logical Block Address (LBA)
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///
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typedef UINT64 EFI_PEI_LBA;
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///
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/// EFI_PEI_BLOCK_DEVICE_TYPE
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///
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typedef enum {
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LegacyFloppy = 0, ///< The recovery device is a floppy.
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IdeCDROM = 1, ///< The recovery device is an IDE CD-ROM
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IdeLS120 = 2, ///< The recovery device is an IDE LS-120
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UsbMassStorage= 3, ///< The recovery device is a USB Mass Storage device
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MaxDeviceType
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} EFI_PEI_BLOCK_DEVICE_TYPE;
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///
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/// Inconsistent with specification here:
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/// PEI_BLOCK_IO_MEDIA has been changed to EFI_PEI_BLOCK_IO_MEDIA.
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/// Inconsistency exists in UEFI Platform Initialization Specification 1.2
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/// Volume 1: Pre-EFI Initalization Core Interface, where all referrences to
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/// this structure name are with the "EFI_" prefix, except for the definition
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/// which is without "EFI_". So the name of PEI_BLOCK_IO_MEDIA is taken as the
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/// exception, and EFI_PEI_BLOCK_IO_MEDIA is used to comply with most part of
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/// the specification.
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///
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typedef struct {
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///
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/// The type of media device being referenced by DeviceIndex.
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///
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EFI_PEI_BLOCK_DEVICE_TYPE DeviceType;
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///
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/// A flag that indicates if media is present. This flag is always set for
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/// nonremovable media devices.
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///
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BOOLEAN MediaPresent;
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///
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/// The last logical block that the device supports.
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///
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UINTN LastBlock;
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///
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/// The size of a logical block in bytes.
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///
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UINTN BlockSize;
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} EFI_PEI_BLOCK_IO_MEDIA;
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/**
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Gets the count of block I/O devices that one specific block driver detects.
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This function is used for getting the count of block I/O devices that one
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specific block driver detects. To the PEI ATAPI driver, it returns the number
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of all the detected ATAPI devices it detects during the enumeration process.
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To the PEI legacy floppy driver, it returns the number of all the legacy
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devices it finds during its enumeration process. If no device is detected,
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then the function will return zero.
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@param[in] PeiServices General-purpose services that are available
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to every PEIM.
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@param[in] This Indicates the EFI_PEI_RECOVERY_BLOCK_IO_PPI
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instance.
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@param[out] NumberBlockDevices The number of block I/O devices discovered.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_GET_NUMBER_BLOCK_DEVICES)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO_PPI *This,
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OUT UINTN *NumberBlockDevices
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);
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/**
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Gets a block device's media information.
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This function will provide the caller with the specified block device's media
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information. If the media changes, calling this function will update the media
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information accordingly.
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@param[in] PeiServices General-purpose services that are available to every
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PEIM
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@param[in] This Indicates the EFI_PEI_RECOVERY_BLOCK_IO_PPI instance.
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@param[in] DeviceIndex Specifies the block device to which the function wants
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to talk. Because the driver that implements Block I/O
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PPIs will manage multiple block devices, the PPIs that
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want to talk to a single device must specify the
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device index that was assigned during the enumeration
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process. This index is a number from one to
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NumberBlockDevices.
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@param[out] MediaInfo The media information of the specified block media.
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The caller is responsible for the ownership of this
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data structure.
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@par Note:
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The MediaInfo structure describes an enumeration of possible block device
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types. This enumeration exists because no device paths are actually passed
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across interfaces that describe the type or class of hardware that is publishing
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the block I/O interface. This enumeration will allow for policy decisions
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in the Recovery PEIM, such as "Try to recover from legacy floppy first,
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LS-120 second, CD-ROM third." If there are multiple partitions abstracted
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by a given device type, they should be reported in ascending order; this
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order also applies to nested partitions, such as legacy MBR, where the
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outermost partitions would have precedence in the reporting order. The
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same logic applies to systems such as IDE that have precedence relationships
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like "Master/Slave" or "Primary/Secondary"; the master device should be
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reported first, the slave second.
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@retval EFI_SUCCESS Media information about the specified block device
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was obtained successfully.
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@retval EFI_DEVICE_ERROR Cannot get the media information due to a hardware
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error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_GET_DEVICE_MEDIA_INFORMATION)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO_PPI *This,
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IN UINTN DeviceIndex,
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OUT EFI_PEI_BLOCK_IO_MEDIA *MediaInfo
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);
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/**
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Reads the requested number of blocks from the specified block device.
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The function reads the requested number of blocks from the device. All the
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blocks are read, or an error is returned. If there is no media in the device,
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the function returns EFI_NO_MEDIA.
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@param[in] PeiServices General-purpose services that are available to
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every PEIM.
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@param[in] This Indicates the EFI_PEI_RECOVERY_BLOCK_IO_PPI instance.
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@param[in] DeviceIndex Specifies the block device to which the function wants
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to talk. Because the driver that implements Block I/O
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PPIs will manage multiple block devices, the PPIs that
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want to talk to a single device must specify the device
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index that was assigned during the enumeration process.
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This index is a number from one to NumberBlockDevices.
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@param[in] StartLBA The starting logical block address (LBA) to read from
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on the device
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@param[in] BufferSize The size of the Buffer in bytes. This number must be
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a multiple of the intrinsic block size of the device.
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@param[out] Buffer A pointer to the destination buffer for the data.
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The caller is responsible for the ownership of the
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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 attempting
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to perform the read operation.
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@retval EFI_INVALID_PARAMETER The read request contains LBAs that are not
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valid, or the buffer is not properly aligned.
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@retval EFI_NO_MEDIA There is no media in the device.
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@retval EFI_BAD_BUFFER_SIZE The BufferSize parameter is not a multiple of
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the intrinsic block size of the device.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_READ_BLOCKS)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO_PPI *This,
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IN UINTN DeviceIndex,
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IN EFI_PEI_LBA StartLBA,
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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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/// EFI_PEI_RECOVERY_BLOCK_IO_PPI provides the services that are required
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/// to access a block I/O device during PEI recovery boot mode.
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///
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struct _EFI_PEI_RECOVERY_BLOCK_IO_PPI {
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///
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/// Gets the number of block I/O devices that the specific block driver manages.
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///
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EFI_PEI_GET_NUMBER_BLOCK_DEVICES GetNumberOfBlockDevices;
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///
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/// Gets the specified media information.
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///
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EFI_PEI_GET_DEVICE_MEDIA_INFORMATION GetBlockDeviceMediaInfo;
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///
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/// Reads the requested number of blocks from the specified block device.
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///
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EFI_PEI_READ_BLOCKS ReadBlocks;
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};
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extern EFI_GUID gEfiPeiVirtualBlockIoPpiGuid;
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#endif
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