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218 lines
9.0 KiB
C
218 lines
9.0 KiB
C
/** @file
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Provides the services required to access a block I/O 2 device during PEI recovery
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boot mode.
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Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This PPI is defined in UEFI Platform Initialization Specification 1.4 Volume 1:
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Pre-EFI Initalization Core Interface.
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**/
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#ifndef _PEI_BLOCK_IO2_H_
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#define _PEI_BLOCK_IO2_H_
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#include <Ppi/BlockIo.h>
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#include <Protocol/DevicePath.h>
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///
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/// Global ID for EFI_PEI_RECOVERY_BLOCK_IO2_PPI
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///
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#define EFI_PEI_RECOVERY_BLOCK_IO2_PPI_GUID \
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{ \
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0x26cc0fad, 0xbeb3, 0x478a, { 0x91, 0xb2, 0xc, 0x18, 0x8f, 0x72, 0x61, 0x98 } \
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}
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///
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/// The forward declaration for EFI_PEI_RECOVERY_BLOCK_IO_PPI.
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///
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typedef struct _EFI_PEI_RECOVERY_BLOCK_IO2_PPI EFI_PEI_RECOVERY_BLOCK_IO2_PPI;
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#define EFI_PEI_RECOVERY_BLOCK_IO2_PPI_REVISION 0x00010000
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typedef struct {
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///
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/// A type of interface that the device being referenced by DeviceIndex is
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/// attached to. This field re-uses Messaging Device Path Node sub-type values
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/// as defined by Section 9.3.5 Messaging Device Path of UEFI Specification.
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/// When more than one sub-type is associated with the interface, sub-type with
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/// the smallest number must be used.
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///
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UINT8 InterfaceType;
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///
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/// A flag that indicates if media is removable.
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///
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BOOLEAN RemovableMedia;
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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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/// non-removable media devices.
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///
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BOOLEAN MediaPresent;
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///
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/// A flag that indicates if media is read-only.
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///
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BOOLEAN ReadOnly;
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///
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/// The size of a logical block in bytes.
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///
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UINT32 BlockSize;
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///
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/// The last logical block that the device supports.
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///
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EFI_PEI_LBA LastBlock;
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} EFI_PEI_BLOCK_IO2_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_IO2_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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@retval EFI_SUCCESS The operation performed successfully.
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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_DEVICES2)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO2_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_IO2_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_INFORMATION2)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO2_PPI *This,
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IN UINTN DeviceIndex,
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OUT EFI_PEI_BLOCK_IO2_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_IO2_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, 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_BLOCKS2)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_RECOVERY_BLOCK_IO2_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_IO2_PPI {
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///
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/// The revision to which the interface adheres.
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/// All future revisions must be backwards compatible.
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///
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UINT64 Revision;
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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_DEVICES2 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_INFORMATION2 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_BLOCKS2 ReadBlocks;
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};
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extern EFI_GUID gEfiPeiVirtualBlockIo2PpiGuid;
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#endif
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