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/** @file
Disk I/O 2 protocol as defined in the UEFI 2.4 specification.
The Disk I/O 2 protocol defines an extension to the Disk I/O protocol to enable
non-blocking / asynchronous byte-oriented disk operation.
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __DISK_IO2_H__
#define __DISK_IO2_H__
#define EFI_DISK_IO2_PROTOCOL_GUID \
{ \
0x151c8eae, 0x7f2c, 0x472c, 0x9e, 0x54, 0x98, 0x28, 0x19, 0x4f, 0x6a, 0x88 \
}
typedef struct _EFI_DISK_IO2_PROTOCOL EFI_DISK_IO2_PROTOCOL;
/**
The struct of Disk IO2 Token.
**/
typedef struct {
//
// If Event is NULL, then blocking I/O is performed.
// If Event is not NULL and non-blocking I/O is supported, then non-blocking I/O is performed,
// and Event will be signaled when the I/O request is completed.
// The caller must be prepared to handle the case where the callback associated with Event occurs
// before the original asynchronous I/O request call returns.
//
EFI_EVENT Event;
//
// Defines whether or not the signaled event encountered an error.
//
EFI_STATUS TransactionStatus;
} EFI_DISK_IO2_TOKEN;
/**
Terminate outstanding asynchronous requests to a device.
@param This Indicates a pointer to the calling context.
@retval EFI_SUCCESS All outstanding requests were successfully terminated.
@retval EFI_DEVICE_ERROR The device reported an error while performing the cancel
operation.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_CANCEL_EX)(
IN EFI_DISK_IO2_PROTOCOL *This
);
/**
Reads a specified number of bytes from a device.
@param This Indicates a pointer to the calling context.
@param MediaId ID of the medium to be read.
@param Offset The starting byte offset on the logical block I/O device to read from.
@param Token A pointer to the token associated with the transaction.
If this field is NULL, synchronous/blocking IO is performed.
@param BufferSize The size in bytes of Buffer. The number of bytes to read from the device.
@param Buffer A pointer to the destination buffer for the data.
The caller is responsible either having implicit or explicit ownership of the buffer.
@retval EFI_SUCCESS If Event is NULL (blocking I/O): The data was read correctly from the device.
If Event is not NULL (asynchronous I/O): The request was successfully queued for processing.
Event will be signaled upon completion.
@retval EFI_DEVICE_ERROR The device reported an error while performing the write.
@retval EFI_NO_MEDIA There is no medium in the device.
@retval EFI_MEDIA_CHNAGED The MediaId is not for the current medium.
@retval EFI_INVALID_PARAMETER The read request contains device addresses that are not valid for the device.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_READ_EX)(
IN EFI_DISK_IO2_PROTOCOL *This,
IN UINT32 MediaId,
IN UINT64 Offset,
IN OUT EFI_DISK_IO2_TOKEN *Token,
IN UINTN BufferSize,
OUT VOID *Buffer
);
/**
Writes a specified number of bytes to a device.
@param This Indicates a pointer to the calling context.
@param MediaId ID of the medium to be written.
@param Offset The starting byte offset on the logical block I/O device to write to.
@param Token A pointer to the token associated with the transaction.
If this field is NULL, synchronous/blocking IO is performed.
@param BufferSize The size in bytes of Buffer. The number of bytes to write to the device.
@param Buffer A pointer to the buffer containing the data to be written.
@retval EFI_SUCCESS If Event is NULL (blocking I/O): The data was written correctly to the device.
If Event is not NULL (asynchronous I/O): The request was successfully queued for processing.
Event will be signaled upon completion.
@retval EFI_WRITE_PROTECTED The device cannot be written to.
@retval EFI_DEVICE_ERROR The device reported an error while performing the write operation.
@retval EFI_NO_MEDIA There is no medium in the device.
@retval EFI_MEDIA_CHNAGED The MediaId is not for the current medium.
@retval EFI_INVALID_PARAMETER The write request contains device addresses that are not valid for the device.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_WRITE_EX)(
IN EFI_DISK_IO2_PROTOCOL *This,
IN UINT32 MediaId,
IN UINT64 Offset,
IN OUT EFI_DISK_IO2_TOKEN *Token,
IN UINTN BufferSize,
IN VOID *Buffer
);
/**
Flushes all modified data to the physical device.
@param This Indicates a pointer to the calling context.
@param MediaId ID of the medium to be written.
@param Token A pointer to the token associated with the transaction.
If this field is NULL, synchronous/blocking IO is performed.
@retval EFI_SUCCESS If Event is NULL (blocking I/O): The data was flushed successfully to the device.
If Event is not NULL (asynchronous I/O): The request was successfully queued for processing.
Event will be signaled upon completion.
@retval EFI_WRITE_PROTECTED The device cannot be written to.
@retval EFI_DEVICE_ERROR The device reported an error while performing the write operation.
@retval EFI_NO_MEDIA There is no medium in the device.
@retval EFI_MEDIA_CHNAGED The MediaId is not for the current medium.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISK_FLUSH_EX)(
IN EFI_DISK_IO2_PROTOCOL *This,
IN OUT EFI_DISK_IO2_TOKEN *Token
);
#define EFI_DISK_IO2_PROTOCOL_REVISION 0x00020000
///
/// This protocol is used to abstract Block I/O interfaces.
///
struct _EFI_DISK_IO2_PROTOCOL {
///
/// The revision to which the disk I/O interface adheres. All future
/// revisions must be backwards compatible. If a future version is not
/// backwards compatible, it is not the same GUID.
///
UINT64 Revision;
EFI_DISK_CANCEL_EX Cancel;
EFI_DISK_READ_EX ReadDiskEx;
EFI_DISK_WRITE_EX WriteDiskEx;
EFI_DISK_FLUSH_EX FlushDiskEx;
};
extern EFI_GUID gEfiDiskIo2ProtocolGuid;
#endif