MdePkg/Include/Protocol/ScsiIo.h - third_party/edk2 - Git at Google

 /** @file
   EFI_SCSI_IO_PROTOCOL as defined in UEFI 2.0.
   This protocol is used by code, typically drivers, running in the EFI boot
   services environment to access SCSI devices. In particular, functions for
   managing devices on SCSI buses are defined here.

   Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php

   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 **/

 #ifndef __EFI_SCSI_IO_PROTOCOL_H__
 #define __EFI_SCSI_IO_PROTOCOL_H__

 #define EFI_SCSI_IO_PROTOCOL_GUID \
   { \
     0x932f47e6, 0x2362, 0x4002, {0x80, 0x3e, 0x3c, 0xd5, 0x4b, 0x13, 0x8f, 0x85 } \
   }

 ///
 /// Forward reference for pure ANSI compatability
 ///
 typedef struct _EFI_SCSI_IO_PROTOCOL EFI_SCSI_IO_PROTOCOL;

 //
 // SCSI Device type information, defined in the SCSI Primary Commands standard (e.g., SPC-4)
 //
 #define EFI_SCSI_IO_TYPE_DISK                                  0x00    ///< Disk device
 #define EFI_SCSI_IO_TYPE_TAPE                                  0x01    ///< Tape device
 #define EFI_SCSI_IO_TYPE_PRINTER                               0x02    ///< Printer
 #define EFI_SCSI_IO_TYPE_PROCESSOR                             0x03    ///< Processor
 #define EFI_SCSI_IO_TYPE_WORM                                  0x04    ///< Write-once read-multiple
 #define EFI_SCSI_IO_TYPE_CDROM                                 0x05    ///< CD or DVD device
 #define EFI_SCSI_IO_TYPE_SCANNER                               0x06    ///< Scanner device
 #define EFI_SCSI_IO_TYPE_OPTICAL                               0x07    ///< Optical memory device
 #define EFI_SCSI_IO_TYPE_MEDIUMCHANGER                         0x08    ///< Medium Changer device
 #define EFI_SCSI_IO_TYPE_COMMUNICATION                         0x09    ///< Communications device
 #define MFI_SCSI_IO_TYPE_A                                     0x0A    ///< Obsolete
 #define MFI_SCSI_IO_TYPE_B                                     0x0B    ///< Obsolete
 #define MFI_SCSI_IO_TYPE_RAID                                  0x0C    ///< Storage array controller device (e.g., RAID)
 #define MFI_SCSI_IO_TYPE_SES                                   0x0D    ///< Enclosure services device
 #define MFI_SCSI_IO_TYPE_RBC                                   0x0E    ///< Simplified direct-access device (e.g., magnetic disk)
 #define MFI_SCSI_IO_TYPE_OCRW                                  0x0F    ///< Optical card reader/writer device
 #define MFI_SCSI_IO_TYPE_BRIDGE                                0x10    ///< Bridge Controller Commands
 #define MFI_SCSI_IO_TYPE_OSD                                   0x11    ///< Object-based Storage Device
 #define EFI_SCSI_IO_TYPE_RESERVED_LOW                          0x12    ///< Reserved (low)
 #define EFI_SCSI_IO_TYPE_RESERVED_HIGH                         0x1E    ///< Reserved (high)
 #define EFI_SCSI_IO_TYPE_UNKNOWN                               0x1F    ///< Unknown no device type

 //
 // SCSI Data Direction definition
 //
 #define EFI_SCSI_IO_DATA_DIRECTION_READ                        0
 #define EFI_SCSI_IO_DATA_DIRECTION_WRITE                       1
 #define EFI_SCSI_IO_DATA_DIRECTION_BIDIRECTIONAL               2

 //
 // SCSI Host Adapter Status definition
 //
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_OK                     0x00
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_TIMEOUT_COMMAND        0x09    ///< timeout when processing the command
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_TIMEOUT                0x0b    ///< timeout when waiting for the command processing
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_MESSAGE_REJECT         0x0d    ///< a message reject was received when processing command
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_BUS_RESET              0x0e    ///< a bus reset was detected
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_PARITY_ERROR           0x0f
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_REQUEST_SENSE_FAILED   0x10    ///< the adapter failed in issuing request sense command
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_SELECTION_TIMEOUT      0x11    ///< selection timeout
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_DATA_OVERRUN_UNDERRUN  0x12    ///< data overrun or data underrun
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_BUS_FREE               0x13    ///< Unexepected bus free
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_PHASE_ERROR            0x14    ///< Target bus phase sequence failure
 #define EFI_SCSI_IO_STATUS_HOST_ADAPTER_OTHER                  0x7f


 //
 // SCSI Target Status definition
 //
 #define EFI_SCSI_IO_STATUS_TARGET_GOOD                         0x00
 #define EFI_SCSI_IO_STATUS_TARGET_CHECK_CONDITION              0x02    ///< check condition
 #define EFI_SCSI_IO_STATUS_TARGET_CONDITION_MET                0x04    ///< condition met
 #define EFI_SCSI_IO_STATUS_TARGET_BUSY                         0x08    ///< busy
 #define EFI_SCSI_IO_STATUS_TARGET_INTERMEDIATE                 0x10    ///< intermediate
 #define EFI_SCSI_IO_STATUS_TARGET_INTERMEDIATE_CONDITION_MET   0x14    ///< intermediate-condition met
 #define EFI_SCSI_IO_STATUS_TARGET_RESERVATION_CONFLICT         0x18    ///< reservation conflict
 #define EFI_SCSI_IO_STATUS_TARGET_COMMOND_TERMINATED           0x22    ///< command terminated
 #define EFI_SCSI_IO_STATUS_TARGET_QUEUE_FULL                   0x28    ///< queue full

 typedef struct {
   ///
   /// The timeout, in 100 ns units, to use for the execution of this SCSI
   /// Request Packet. A Timeout value of 0 means that this function
   /// will wait indefinitely for the SCSI Request Packet to execute. If
   /// Timeout is greater than zero, then this function will return
   /// EFI_TIMEOUT if the time required to execute the SCSI Request
   /// Packet is greater than Timeout.
   ///
   UINT64                              Timeout;
   ///
   /// A pointer to the data buffer to transfer between the SCSI
   /// controller and the SCSI device for SCSI READ command
   ///
   VOID                                *InDataBuffer;
   ///
   /// A pointer to the data buffer to transfer between the SCSI
   /// controller and the SCSI device for SCSI WRITE command.
   ///
   VOID                                *OutDataBuffer;
   ///
   /// A pointer to the sense data that was generated by the execution of
   /// the SCSI Request Packet.
   ///
   VOID                                *SenseData;
   ///
   /// A pointer to buffer that contains the Command Data Block to
   /// send to the SCSI device.
   ///
   VOID                                *Cdb;
   ///
   /// On Input, the size, in bytes, of InDataBuffer. On output, the
   /// number of bytes transferred between the SCSI controller and the SCSI device.
   ///
   UINT32                              InTransferLength;
   ///
   /// On Input, the size, in bytes of OutDataBuffer. On Output, the
   /// Number of bytes transferred between SCSI Controller and the SCSI device.
   ///
   UINT32                              OutTransferLength;
   ///
   /// The length, in bytes, of the buffer Cdb. The standard values are
   /// 6, 10, 12, and 16, but other values are possible if a variable length CDB is used.
   ///
   UINT8                               CdbLength;
   ///
   /// The direction of the data transfer. 0 for reads, 1 for writes. A
   /// value of 2 is Reserved for Bi-Directional SCSI commands.
   ///
   UINT8                               DataDirection;
   ///
   /// The status of the SCSI Host Controller that produces the SCSI
   /// bus where the SCSI device attached when the SCSI Request
   /// Packet was executed on the SCSI Controller.
   ///
   UINT8                               HostAdapterStatus;
   ///
   /// The status returned by the SCSI device when the SCSI Request
   /// Packet was executed.
   ///
   UINT8                               TargetStatus;
   ///
   /// On input, the length in bytes of the SenseData buffer. On
   /// output, the number of bytes written to the SenseData buffer.
   ///
   UINT8                               SenseDataLength;
 } EFI_SCSI_IO_SCSI_REQUEST_PACKET;

 /**
   Retrieves the device type information of the SCSI Controller.

   @param  This       Protocol instance pointer.
   @param  DeviceType A pointer to the device type information
                      retrieved from the SCSI Controller.

   @retval EFI_SUCCESS           Retrieved the device type information successfully.
   @retval EFI_INVALID_PARAMETER The DeviceType is NULL.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_SCSI_IO_PROTOCOL_GET_DEVICE_TYPE)(
   IN  EFI_SCSI_IO_PROTOCOL            *This,
   OUT UINT8                           *DeviceType
   );

 /**
   Retrieves the device location in the SCSI channel.

   @param  This   Protocol instance pointer.
   @param  Target A pointer to the Target ID of a SCSI device
                  on the SCSI channel.
   @param  Lun    A pointer to the LUN of the SCSI device on
                  the SCSI channel.

   @retval EFI_SUCCESS           Retrieves the device location successfully.
   @retval EFI_INVALID_PARAMETER The Target or Lun is NULL.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_SCSI_IO_PROTOCOL_GET_DEVICE_LOCATION)(
   IN EFI_SCSI_IO_PROTOCOL           *This,
   IN OUT UINT8                      **Target,
   OUT UINT64                        *Lun
   );

 /**
   Resets the SCSI Bus that the SCSI Controller is attached to.

   @param  This Protocol instance pointer.

   @retval EFI_SUCCESS      The SCSI bus is reset successfully.
   @retval EFI_DEVICE_ERROR Errors encountered when resetting the SCSI bus.
   @retval EFI_UNSUPPORTED  The bus reset operation is not supported by the
                            SCSI Host Controller.
   @retval EFI_TIMEOUT      A timeout occurred while attempting to reset
                             the SCSI bus.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_SCSI_IO_PROTOCOL_RESET_BUS)(
   IN EFI_SCSI_IO_PROTOCOL     *This
   );

 /**
   Resets the SCSI Controller that the device handle specifies.

   @param  This Protocol instance pointer.

   @retval EFI_SUCCESS      Reset the SCSI controller successfully.
   @retval EFI_DEVICE_ERROR Errors were encountered when resetting the
                            SCSI Controller.
   @retval EFI_UNSUPPORTED  The SCSI bus does not support a device
                            reset operation.
   @retval EFI_TIMEOUT      A timeout occurred while attempting to
                            reset the SCSI Controller.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_SCSI_IO_PROTOCOL_RESET_DEVICE)(
   IN EFI_SCSI_IO_PROTOCOL     *This
   );


 /**
   Sends a SCSI Request Packet to the SCSI Controller for execution.

   @param  This    Protocol instance pointer.
   @param  Packet  The SCSI request packet to send to the SCSI
                   Controller specified by the device handle.
   @param  Event   If the SCSI bus to which the SCSI device is attached
                   does not support non-blocking I/O, then Event is
                   ignored, and blocking I/O is performed.
                   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 SCSI Request
                   Packet completes.

   @retval EFI_SUCCESS               The SCSI Request Packet was sent by the host
                                     successfully, and TransferLength bytes were
                                     transferred to/from DataBuffer. See
                                     HostAdapterStatus, TargetStatus,
                                     SenseDataLength, and SenseData in that order
                                     for additional status information.
   @retval EFI_BAD_BUFFER_SIZE       The SCSI Request Packet was executed,
                                     but the entire DataBuffer could not be transferred.
                                     The actual number of bytes transferred is returned
                                     in TransferLength. See HostAdapterStatus,
                                     TargetStatus, SenseDataLength, and SenseData in
                                     that order for additional status information.
   @retval EFI_NOT_READY             The SCSI Request Packet could not be sent because
                                     there are too many SCSI Command Packets already
                                     queued.The caller may retry again later.
   @retval EFI_DEVICE_ERROR          A device error occurred while attempting to send
                                     the SCSI Request Packet. See HostAdapterStatus,
                                     TargetStatus, SenseDataLength, and SenseData in
                                     that order for additional status information.
   @retval EFI_INVALID_PARAMETER     The contents of CommandPacket are invalid.
                                     The SCSI Request Packet was not sent, so no
                                     additional status information is available.
   @retval EFI_UNSUPPORTED           The command described by the SCSI Request Packet
                                     is not supported by the SCSI initiator(i.e., SCSI
                                     Host Controller). The SCSI Request Packet was not
                                     sent, so no additional status information is
                                     available.
   @retval EFI_TIMEOUT               A timeout occurred while waiting for the SCSI
                                     Request Packet to execute. See HostAdapterStatus,
                                     TargetStatus, SenseDataLength, and SenseData in
                                     that order for additional status information.

 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_SCSI_IO_PROTOCOL_EXEC_SCSI_COMMAND)(
   IN EFI_SCSI_IO_PROTOCOL                   *This,
   IN OUT  EFI_SCSI_IO_SCSI_REQUEST_PACKET   *Packet,
   IN EFI_EVENT                              Event  OPTIONAL
   );

 ///
 /// Provides services to manage and communicate with SCSI devices.
 ///
 struct _EFI_SCSI_IO_PROTOCOL {
   EFI_SCSI_IO_PROTOCOL_GET_DEVICE_TYPE      GetDeviceType;
   EFI_SCSI_IO_PROTOCOL_GET_DEVICE_LOCATION  GetDeviceLocation;
   EFI_SCSI_IO_PROTOCOL_RESET_BUS            ResetBus;
   EFI_SCSI_IO_PROTOCOL_RESET_DEVICE         ResetDevice;
   EFI_SCSI_IO_PROTOCOL_EXEC_SCSI_COMMAND    ExecuteScsiCommand;

   ///
   /// Supplies the alignment requirement for any buffer used in a data transfer.
   /// IoAlign values of 0 and 1 mean that the buffer can be placed anywhere in memory.
   /// Otherwise, IoAlign must be a power of 2, and the requirement is that the
   /// start address of a buffer must be evenly divisible by IoAlign with no remainder.
   ///
   UINT32                                    IoAlign;
 };

 extern EFI_GUID gEfiScsiIoProtocolGuid;

 #endif
	/** @file
	EFI_SCSI_IO_PROTOCOL as defined in UEFI 2.0.
	This protocol is used by code, typically drivers, running in the EFI boot
	services environment to access SCSI devices. In particular, functions for
	managing devices on SCSI buses are defined here.

	Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
	This program and the accompanying materials
	are licensed and made available under the terms and conditions of the BSD License
	which accompanies this distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	**/

	#ifndef __EFI_SCSI_IO_PROTOCOL_H__
	#define __EFI_SCSI_IO_PROTOCOL_H__

	#define EFI_SCSI_IO_PROTOCOL_GUID \
	{ \
	0x932f47e6, 0x2362, 0x4002, {0x80, 0x3e, 0x3c, 0xd5, 0x4b, 0x13, 0x8f, 0x85 } \
	}

	///
	/// Forward reference for pure ANSI compatability
	///
	typedef struct _EFI_SCSI_IO_PROTOCOL EFI_SCSI_IO_PROTOCOL;

	//
	// SCSI Device type information, defined in the SCSI Primary Commands standard (e.g., SPC-4)
	//
	#define EFI_SCSI_IO_TYPE_DISK 0x00 ///< Disk device
	#define EFI_SCSI_IO_TYPE_TAPE 0x01 ///< Tape device
	#define EFI_SCSI_IO_TYPE_PRINTER 0x02 ///< Printer
	#define EFI_SCSI_IO_TYPE_PROCESSOR 0x03 ///< Processor
	#define EFI_SCSI_IO_TYPE_WORM 0x04 ///< Write-once read-multiple
	#define EFI_SCSI_IO_TYPE_CDROM 0x05 ///< CD or DVD device
	#define EFI_SCSI_IO_TYPE_SCANNER 0x06 ///< Scanner device
	#define EFI_SCSI_IO_TYPE_OPTICAL 0x07 ///< Optical memory device
	#define EFI_SCSI_IO_TYPE_MEDIUMCHANGER 0x08 ///< Medium Changer device
	#define EFI_SCSI_IO_TYPE_COMMUNICATION 0x09 ///< Communications device
	#define MFI_SCSI_IO_TYPE_A 0x0A ///< Obsolete
	#define MFI_SCSI_IO_TYPE_B 0x0B ///< Obsolete
	#define MFI_SCSI_IO_TYPE_RAID 0x0C ///< Storage array controller device (e.g., RAID)
	#define MFI_SCSI_IO_TYPE_SES 0x0D ///< Enclosure services device
	#define MFI_SCSI_IO_TYPE_RBC 0x0E ///< Simplified direct-access device (e.g., magnetic disk)
	#define MFI_SCSI_IO_TYPE_OCRW 0x0F ///< Optical card reader/writer device
	#define MFI_SCSI_IO_TYPE_BRIDGE 0x10 ///< Bridge Controller Commands
	#define MFI_SCSI_IO_TYPE_OSD 0x11 ///< Object-based Storage Device
	#define EFI_SCSI_IO_TYPE_RESERVED_LOW 0x12 ///< Reserved (low)
	#define EFI_SCSI_IO_TYPE_RESERVED_HIGH 0x1E ///< Reserved (high)
	#define EFI_SCSI_IO_TYPE_UNKNOWN 0x1F ///< Unknown no device type

	//
	// SCSI Data Direction definition
	//
	#define EFI_SCSI_IO_DATA_DIRECTION_READ 0
	#define EFI_SCSI_IO_DATA_DIRECTION_WRITE 1
	#define EFI_SCSI_IO_DATA_DIRECTION_BIDIRECTIONAL 2

	//
	// SCSI Host Adapter Status definition
	//
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_OK 0x00
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_TIMEOUT_COMMAND 0x09 ///< timeout when processing the command
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_TIMEOUT 0x0b ///< timeout when waiting for the command processing
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_MESSAGE_REJECT 0x0d ///< a message reject was received when processing command
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_BUS_RESET 0x0e ///< a bus reset was detected
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_PARITY_ERROR 0x0f
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_REQUEST_SENSE_FAILED 0x10 ///< the adapter failed in issuing request sense command
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_SELECTION_TIMEOUT 0x11 ///< selection timeout
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_DATA_OVERRUN_UNDERRUN 0x12 ///< data overrun or data underrun
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_BUS_FREE 0x13 ///< Unexepected bus free
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_PHASE_ERROR 0x14 ///< Target bus phase sequence failure
	#define EFI_SCSI_IO_STATUS_HOST_ADAPTER_OTHER 0x7f


	//
	// SCSI Target Status definition
	//
	#define EFI_SCSI_IO_STATUS_TARGET_GOOD 0x00
	#define EFI_SCSI_IO_STATUS_TARGET_CHECK_CONDITION 0x02 ///< check condition
	#define EFI_SCSI_IO_STATUS_TARGET_CONDITION_MET 0x04 ///< condition met
	#define EFI_SCSI_IO_STATUS_TARGET_BUSY 0x08 ///< busy
	#define EFI_SCSI_IO_STATUS_TARGET_INTERMEDIATE 0x10 ///< intermediate
	#define EFI_SCSI_IO_STATUS_TARGET_INTERMEDIATE_CONDITION_MET 0x14 ///< intermediate-condition met
	#define EFI_SCSI_IO_STATUS_TARGET_RESERVATION_CONFLICT 0x18 ///< reservation conflict
	#define EFI_SCSI_IO_STATUS_TARGET_COMMOND_TERMINATED 0x22 ///< command terminated
	#define EFI_SCSI_IO_STATUS_TARGET_QUEUE_FULL 0x28 ///< queue full

	typedef struct {
	///
	/// The timeout, in 100 ns units, to use for the execution of this SCSI
	/// Request Packet. A Timeout value of 0 means that this function
	/// will wait indefinitely for the SCSI Request Packet to execute. If
	/// Timeout is greater than zero, then this function will return
	/// EFI_TIMEOUT if the time required to execute the SCSI Request
	/// Packet is greater than Timeout.
	///
	UINT64 Timeout;
	///
	/// A pointer to the data buffer to transfer between the SCSI
	/// controller and the SCSI device for SCSI READ command
	///
	VOID *InDataBuffer;
	///
	/// A pointer to the data buffer to transfer between the SCSI
	/// controller and the SCSI device for SCSI WRITE command.
	///
	VOID *OutDataBuffer;
	///
	/// A pointer to the sense data that was generated by the execution of
	/// the SCSI Request Packet.
	///
	VOID *SenseData;
	///
	/// A pointer to buffer that contains the Command Data Block to
	/// send to the SCSI device.
	///
	VOID *Cdb;
	///
	/// On Input, the size, in bytes, of InDataBuffer. On output, the
	/// number of bytes transferred between the SCSI controller and the SCSI device.
	///
	UINT32 InTransferLength;
	///
	/// On Input, the size, in bytes of OutDataBuffer. On Output, the
	/// Number of bytes transferred between SCSI Controller and the SCSI device.
	///
	UINT32 OutTransferLength;
	///
	/// The length, in bytes, of the buffer Cdb. The standard values are
	/// 6, 10, 12, and 16, but other values are possible if a variable length CDB is used.
	///
	UINT8 CdbLength;
	///
	/// The direction of the data transfer. 0 for reads, 1 for writes. A
	/// value of 2 is Reserved for Bi-Directional SCSI commands.
	///
	UINT8 DataDirection;
	///
	/// The status of the SCSI Host Controller that produces the SCSI
	/// bus where the SCSI device attached when the SCSI Request
	/// Packet was executed on the SCSI Controller.
	///
	UINT8 HostAdapterStatus;
	///
	/// The status returned by the SCSI device when the SCSI Request
	/// Packet was executed.
	///
	UINT8 TargetStatus;
	///
	/// On input, the length in bytes of the SenseData buffer. On
	/// output, the number of bytes written to the SenseData buffer.
	///
	UINT8 SenseDataLength;
	} EFI_SCSI_IO_SCSI_REQUEST_PACKET;

	/**
	Retrieves the device type information of the SCSI Controller.

	@param This Protocol instance pointer.
	@param DeviceType A pointer to the device type information
	retrieved from the SCSI Controller.

	@retval EFI_SUCCESS Retrieved the device type information successfully.
	@retval EFI_INVALID_PARAMETER The DeviceType is NULL.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_SCSI_IO_PROTOCOL_GET_DEVICE_TYPE)(
	IN EFI_SCSI_IO_PROTOCOL *This,
	OUT UINT8 *DeviceType
	);

	/**
	Retrieves the device location in the SCSI channel.

	@param This Protocol instance pointer.
	@param Target A pointer to the Target ID of a SCSI device
	on the SCSI channel.
	@param Lun A pointer to the LUN of the SCSI device on
	the SCSI channel.

	@retval EFI_SUCCESS Retrieves the device location successfully.
	@retval EFI_INVALID_PARAMETER The Target or Lun is NULL.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_SCSI_IO_PROTOCOL_GET_DEVICE_LOCATION)(
	IN EFI_SCSI_IO_PROTOCOL *This,
	IN OUT UINT8 **Target,
	OUT UINT64 *Lun
	);

	/**
	Resets the SCSI Bus that the SCSI Controller is attached to.

	@param This Protocol instance pointer.

	@retval EFI_SUCCESS The SCSI bus is reset successfully.
	@retval EFI_DEVICE_ERROR Errors encountered when resetting the SCSI bus.
	@retval EFI_UNSUPPORTED The bus reset operation is not supported by the
	SCSI Host Controller.
	@retval EFI_TIMEOUT A timeout occurred while attempting to reset
	the SCSI bus.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_SCSI_IO_PROTOCOL_RESET_BUS)(
	IN EFI_SCSI_IO_PROTOCOL *This
	);

	/**
	Resets the SCSI Controller that the device handle specifies.

	@param This Protocol instance pointer.

	@retval EFI_SUCCESS Reset the SCSI controller successfully.
	@retval EFI_DEVICE_ERROR Errors were encountered when resetting the
	SCSI Controller.
	@retval EFI_UNSUPPORTED The SCSI bus does not support a device
	reset operation.
	@retval EFI_TIMEOUT A timeout occurred while attempting to
	reset the SCSI Controller.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_SCSI_IO_PROTOCOL_RESET_DEVICE)(
	IN EFI_SCSI_IO_PROTOCOL *This
	);


	/**
	Sends a SCSI Request Packet to the SCSI Controller for execution.

	@param This Protocol instance pointer.
	@param Packet The SCSI request packet to send to the SCSI
	Controller specified by the device handle.
	@param Event If the SCSI bus to which the SCSI device is attached
	does not support non-blocking I/O, then Event is
	ignored, and blocking I/O is performed.
	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 SCSI Request
	Packet completes.

	@retval EFI_SUCCESS The SCSI Request Packet was sent by the host
	successfully, and TransferLength bytes were
	transferred to/from DataBuffer. See
	HostAdapterStatus, TargetStatus,
	SenseDataLength, and SenseData in that order
	for additional status information.
	@retval EFI_BAD_BUFFER_SIZE The SCSI Request Packet was executed,
	but the entire DataBuffer could not be transferred.
	The actual number of bytes transferred is returned
	in TransferLength. See HostAdapterStatus,
	TargetStatus, SenseDataLength, and SenseData in
	that order for additional status information.
	@retval EFI_NOT_READY The SCSI Request Packet could not be sent because
	there are too many SCSI Command Packets already
	queued.The caller may retry again later.
	@retval EFI_DEVICE_ERROR A device error occurred while attempting to send
	the SCSI Request Packet. See HostAdapterStatus,
	TargetStatus, SenseDataLength, and SenseData in
	that order for additional status information.
	@retval EFI_INVALID_PARAMETER The contents of CommandPacket are invalid.
	The SCSI Request Packet was not sent, so no
	additional status information is available.
	@retval EFI_UNSUPPORTED The command described by the SCSI Request Packet
	is not supported by the SCSI initiator(i.e., SCSI
	Host Controller). The SCSI Request Packet was not
	sent, so no additional status information is
	available.
	@retval EFI_TIMEOUT A timeout occurred while waiting for the SCSI
	Request Packet to execute. See HostAdapterStatus,
	TargetStatus, SenseDataLength, and SenseData in
	that order for additional status information.

	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_SCSI_IO_PROTOCOL_EXEC_SCSI_COMMAND)(
	IN EFI_SCSI_IO_PROTOCOL *This,
	IN OUT EFI_SCSI_IO_SCSI_REQUEST_PACKET *Packet,
	IN EFI_EVENT Event OPTIONAL
	);

	///
	/// Provides services to manage and communicate with SCSI devices.
	///
	struct _EFI_SCSI_IO_PROTOCOL {
	EFI_SCSI_IO_PROTOCOL_GET_DEVICE_TYPE GetDeviceType;
	EFI_SCSI_IO_PROTOCOL_GET_DEVICE_LOCATION GetDeviceLocation;
	EFI_SCSI_IO_PROTOCOL_RESET_BUS ResetBus;
	EFI_SCSI_IO_PROTOCOL_RESET_DEVICE ResetDevice;
	EFI_SCSI_IO_PROTOCOL_EXEC_SCSI_COMMAND ExecuteScsiCommand;

	///
	/// Supplies the alignment requirement for any buffer used in a data transfer.
	/// IoAlign values of 0 and 1 mean that the buffer can be placed anywhere in memory.
	/// Otherwise, IoAlign must be a power of 2, and the requirement is that the
	/// start address of a buffer must be evenly divisible by IoAlign with no remainder.
	///
	UINT32 IoAlign;
	};

	extern EFI_GUID gEfiScsiIoProtocolGuid;

	#endif