DevicePath.h

Go to the documentation of this file.

/** @file
  The device path protocol as defined in UEFI 2.0.

  The device path represents a programmatic path to a device,
  from a software point of view. The path must persist from boot to boot, so
  it can not contain things like PCI bus numbers that change from boot to boot.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __EFI_DEVICE_PATH_PROTOCOL_H__
#define __EFI_DEVICE_PATH_PROTOCOL_H__

FILE_LICENCE ( BSD2_PATENT );

#include <ipxe/efi/Guid/PcAnsi.h>
#include <ipxe/efi/IndustryStandard/Bluetooth.h>
#include <ipxe/efi/IndustryStandard/Acpi60.h>

///
/// Device Path protocol.
///
#define EFI_DEVICE_PATH_PROTOCOL_GUID \
  { \
    0x9576e91, 0x6d3f, 0x11d2, {0x8e, 0x39, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  }

///
/// Device Path guid definition for backward-compatible with EFI1.1.
///
#define DEVICE_PATH_PROTOCOL  EFI_DEVICE_PATH_PROTOCOL_GUID

#pragma pack(1)

/**
  This protocol can be used on any device handle to obtain generic path/location
  information concerning the physical device or logical device. If the handle does
  not logically map to a physical device, the handle may not necessarily support
  the device path protocol. The device path describes the location of the device
  the handle is for. The size of the Device Path can be determined from the structures
  that make up the Device Path.
**/
typedef struct {
  UINT8    Type;    ///< 0x01 Hardware Device Path.
                    ///< 0x02 ACPI Device Path.
                    ///< 0x03 Messaging Device Path.
                    ///< 0x04 Media Device Path.
                    ///< 0x05 BIOS Boot Specification Device Path.
                    ///< 0x7F End of Hardware Device Path.

  UINT8    SubType; ///< Varies by Type
                    ///< 0xFF End Entire Device Path, or
                    ///< 0x01 End This Instance of a Device Path and start a new
                    ///< Device Path.

  UINT8    Length[2]; ///< Specific Device Path data. Type and Sub-Type define
                      ///< type of data. Size of data is included in Length.
} EFI_DEVICE_PATH_PROTOCOL;

///
/// Device Path protocol definition for backward-compatible with EFI1.1.
///
typedef EFI_DEVICE_PATH_PROTOCOL EFI_DEVICE_PATH;

///
/// Hardware Device Paths.
///
#define HARDWARE_DEVICE_PATH  0x01

///
/// PCI Device Path SubType.
///
#define HW_PCI_DP  0x01

///
/// PCI Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// PCI Function Number.
  ///
  UINT8                       Function;
  ///
  /// PCI Device Number.
  ///
  UINT8                       Device;
} PCI_DEVICE_PATH;

///
/// PCCARD Device Path SubType.
///
#define HW_PCCARD_DP  0x02

///
/// PCCARD Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Function Number (0 = First Function).
  ///
  UINT8                       FunctionNumber;
} PCCARD_DEVICE_PATH;

///
/// Memory Mapped Device Path SubType.
///
#define HW_MEMMAP_DP  0x03

///
/// Memory Mapped Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// EFI_MEMORY_TYPE
  ///
  UINT32                      MemoryType;
  ///
  /// Starting Memory Address.
  ///
  EFI_PHYSICAL_ADDRESS        StartingAddress;
  ///
  /// Ending Memory Address.
  ///
  EFI_PHYSICAL_ADDRESS        EndingAddress;
} MEMMAP_DEVICE_PATH;

///
/// Hardware Vendor Device Path SubType.
///
#define HW_VENDOR_DP  0x04

///
/// The Vendor Device Path allows the creation of vendor-defined Device Paths. A vendor must
/// allocate a Vendor GUID for a Device Path. The Vendor GUID can then be used to define the
/// contents on the n bytes that follow in the Vendor Device Path node.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Vendor-assigned GUID that defines the data that follows.
  ///
  EFI_GUID                    Guid;
  ///
  /// Vendor-defined variable size data.
  ///
} VENDOR_DEVICE_PATH;

///
/// Controller Device Path SubType.
///
#define HW_CONTROLLER_DP  0x05

///
/// Controller Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Controller number.
  ///
  UINT32                      ControllerNumber;
} CONTROLLER_DEVICE_PATH;

///
/// BMC Device Path SubType.
///
#define HW_BMC_DP  0x06

///
/// BMC Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Interface Type.
  ///
  UINT8                       InterfaceType;
  ///
  /// Base Address.
  ///
  UINT8                       BaseAddress[8];
} BMC_DEVICE_PATH;

///
/// ACPI Device Paths.
///
#define ACPI_DEVICE_PATH  0x02

///
/// ACPI Device Path SubType.
///
#define ACPI_DP  0x01
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Device's PnP hardware ID stored in a numeric 32-bit
  /// compressed EISA-type ID. This value must match the
  /// corresponding _HID in the ACPI name space.
  ///
  UINT32                      HID;
  ///
  /// Unique ID that is required by ACPI if two devices have the
  /// same _HID. This value must also match the corresponding
  /// _UID/_HID pair in the ACPI name space. Only the 32-bit
  /// numeric value type of _UID is supported. Thus, strings must
  /// not be used for the _UID in the ACPI name space.
  ///
  UINT32                      UID;
} ACPI_HID_DEVICE_PATH;

///
/// Expanded ACPI Device Path SubType.
///
#define ACPI_EXTENDED_DP  0x02
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Device's PnP hardware ID stored in a numeric 32-bit
  /// compressed EISA-type ID. This value must match the
  /// corresponding _HID in the ACPI name space.
  ///
  UINT32                      HID;
  ///
  /// Unique ID that is required by ACPI if two devices have the
  /// same _HID. This value must also match the corresponding
  /// _UID/_HID pair in the ACPI name space.
  ///
  UINT32                      UID;
  ///
  /// Device's compatible PnP hardware ID stored in a numeric
  /// 32-bit compressed EISA-type ID. This value must match at
  /// least one of the compatible device IDs returned by the
  /// corresponding _CID in the ACPI name space.
  ///
  UINT32                      CID;
  ///
  /// Optional variable length _HIDSTR.
  /// Optional variable length _UIDSTR.
  /// Optional variable length _CIDSTR.
  ///
} ACPI_EXTENDED_HID_DEVICE_PATH;

//
//  EISA ID Macro
//  EISA ID Definition 32-bits
//   bits[15:0] - three character compressed ASCII EISA ID.
//   bits[31:16] - binary number
//    Compressed ASCII is 5 bits per character 0b00001 = 'A' 0b11010 = 'Z'
//
#define PNP_EISA_ID_CONST  0x41d0
#define EISA_ID(_Name, _Num)  ((UINT32)((_Name) | (_Num) << 16))
#define EISA_PNP_ID(_PNPId)   (EISA_ID(PNP_EISA_ID_CONST, (_PNPId)))
#define EFI_PNP_ID(_PNPId)    (EISA_ID(PNP_EISA_ID_CONST, (_PNPId)))

#define PNP_EISA_ID_MASK  0xffff
#define EISA_ID_TO_NUM(_Id)  ((_Id) >> 16)

///
/// ACPI _ADR Device Path SubType.
///
#define ACPI_ADR_DP  0x03

///
/// The _ADR device path is used to contain video output device attributes to support the Graphics
/// Output Protocol. The device path can contain multiple _ADR entries if multiple video output
/// devices are displaying the same output.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// _ADR value. For video output devices the value of this
  /// field comes from Table B-2 of the ACPI 3.0 specification. At
  /// least one _ADR value is required.
  ///
  UINT32                      ADR;
  //
  // This device path may optionally contain more than one _ADR entry.
  //
} ACPI_ADR_DEVICE_PATH;

///
/// ACPI NVDIMM Device Path SubType.
///
#define ACPI_NVDIMM_DP  0x04
///
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// NFIT Device Handle, the _ADR of the NVDIMM device.
  /// The value of this field comes from Section 9.20.3 of the ACPI 6.2A specification.
  ///
  UINT32                      NFITDeviceHandle;
} ACPI_NVDIMM_DEVICE_PATH;

#define ACPI_ADR_DISPLAY_TYPE_OTHER             0
#define ACPI_ADR_DISPLAY_TYPE_VGA               1
#define ACPI_ADR_DISPLAY_TYPE_TV                2
#define ACPI_ADR_DISPLAY_TYPE_EXTERNAL_DIGITAL  3
#define ACPI_ADR_DISPLAY_TYPE_INTERNAL_DIGITAL  4

#define ACPI_DISPLAY_ADR(_DeviceIdScheme, _HeadId, _NonVgaOutput, _BiosCanDetect, _VendorInfo, _Type, _Port, _Index) \
          ((UINT32)(  ((UINT32)((_DeviceIdScheme) & 0x1) << 31) |  \
                      (((_HeadId)                 & 0x7) << 18) |  \
                      (((_NonVgaOutput)           & 0x1) << 17) |  \
                      (((_BiosCanDetect)          & 0x1) << 16) |  \
                      (((_VendorInfo)             & 0xf) << 12) |  \
                      (((_Type)                   & 0xf) << 8)  |  \
                      (((_Port)                   & 0xf) << 4)  |  \
                       ((_Index)                  & 0xf) ))

///
/// Messaging Device Paths.
/// This Device Path is used to describe the connection of devices outside the resource domain of the
/// system. This Device Path can describe physical messaging information like SCSI ID, or abstract
/// information like networking protocol IP addresses.
///
#define MESSAGING_DEVICE_PATH  0x03

///
/// ATAPI Device Path SubType
///
#define MSG_ATAPI_DP  0x01
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Set to zero for primary, or one for secondary.
  ///
  UINT8                       PrimarySecondary;
  ///
  /// Set to zero for master, or one for slave mode.
  ///
  UINT8                       SlaveMaster;
  ///
  /// Logical Unit Number.
  ///
  UINT16                      Lun;
} ATAPI_DEVICE_PATH;

///
/// SCSI Device Path SubType.
///
#define MSG_SCSI_DP  0x02
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Target ID on the SCSI bus (PUN).
  ///
  UINT16                      Pun;
  ///
  /// Logical Unit Number (LUN).
  ///
  UINT16                      Lun;
} SCSI_DEVICE_PATH;

///
/// Fibre Channel SubType.
///
#define MSG_FIBRECHANNEL_DP  0x03
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Reserved for the future.
  ///
  UINT32                      Reserved;
  ///
  /// Fibre Channel World Wide Number.
  ///
  UINT64                      WWN;
  ///
  /// Fibre Channel Logical Unit Number.
  ///
  UINT64                      Lun;
} FIBRECHANNEL_DEVICE_PATH;

///
/// Fibre Channel Ex SubType.
///
#define MSG_FIBRECHANNELEX_DP  0x15
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Reserved for the future.
  ///
  UINT32                      Reserved;
  ///
  /// 8 byte array containing Fibre Channel End Device Port Name.
  ///
  UINT8                       WWN[8];
  ///
  /// 8 byte array containing Fibre Channel Logical Unit Number.
  ///
  UINT8                       Lun[8];
} FIBRECHANNELEX_DEVICE_PATH;

///
/// 1394 Device Path SubType
///
#define MSG_1394_DP  0x04
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Reserved for the future.
  ///
  UINT32                      Reserved;
  ///
  /// 1394 Global Unique ID (GUID).
  ///
  UINT64                      Guid;
} F1394_DEVICE_PATH;

///
/// USB Device Path SubType.
///
#define MSG_USB_DP  0x05
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// USB Parent Port Number.
  ///
  UINT8                       ParentPortNumber;
  ///
  /// USB Interface Number.
  ///
  UINT8                       InterfaceNumber;
} USB_DEVICE_PATH;

///
/// USB Class Device Path SubType.
///
#define MSG_USB_CLASS_DP  0x0f
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Vendor ID assigned by USB-IF. A value of 0xFFFF will
  /// match any Vendor ID.
  ///
  UINT16                      VendorId;
  ///
  /// Product ID assigned by USB-IF. A value of 0xFFFF will
  /// match any Product ID.
  ///
  UINT16                      ProductId;
  ///
  /// The class code assigned by the USB-IF. A value of 0xFF
  /// will match any class code.
  ///
  UINT8                       DeviceClass;
  ///
  /// The subclass code assigned by the USB-IF. A value of
  /// 0xFF will match any subclass code.
  ///
  UINT8                       DeviceSubClass;
  ///
  /// The protocol code assigned by the USB-IF. A value of
  /// 0xFF will match any protocol code.
  ///
  UINT8                       DeviceProtocol;
} USB_CLASS_DEVICE_PATH;

///
/// USB WWID Device Path SubType.
///
#define MSG_USB_WWID_DP  0x10

///
/// This device path describes a USB device using its serial number.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// USB interface number.
  ///
  UINT16                      InterfaceNumber;
  ///
  /// USB vendor id of the device.
  ///
  UINT16                      VendorId;
  ///
  /// USB product id of the device.
  ///
  UINT16                      ProductId;
  ///
  /// Last 64-or-fewer UTF-16 characters of the USB
  /// serial number. The length of the string is
  /// determined by the Length field less the offset of the
  /// Serial Number field (10)
  ///
  /// CHAR16                     SerialNumber[...];
} USB_WWID_DEVICE_PATH;

///
/// Device Logical Unit SubType.
///
#define MSG_DEVICE_LOGICAL_UNIT_DP  0x11
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Logical Unit Number for the interface.
  ///
  UINT8                       Lun;
} DEVICE_LOGICAL_UNIT_DEVICE_PATH;

///
/// SATA Device Path SubType.
///
#define MSG_SATA_DP  0x12
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// The HBA port number that facilitates the connection to the
  /// device or a port multiplier. The value 0xFFFF is reserved.
  ///
  UINT16                      HBAPortNumber;
  ///
  /// The Port multiplier port number that facilitates the connection
  /// to the device. Must be set to 0xFFFF if the device is directly
  /// connected to the HBA.
  ///
  UINT16                      PortMultiplierPortNumber;
  ///
  /// Logical Unit Number.
  ///
  UINT16                      Lun;
} SATA_DEVICE_PATH;

///
/// Flag for if the device is directly connected to the HBA.
///
#define SATA_HBA_DIRECT_CONNECT_FLAG  0x8000

///
/// I2O Device Path SubType.
///
#define MSG_I2O_DP  0x06
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Target ID (TID) for a device.
  ///
  UINT32                      Tid;
} I2O_DEVICE_PATH;

///
/// MAC Address Device Path SubType.
///
#define MSG_MAC_ADDR_DP  0x0b
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// The MAC address for a network interface padded with 0s.
  ///
  EFI_MAC_ADDRESS             MacAddress;
  ///
  /// Network interface type(i.e. 802.3, FDDI).
  ///
  UINT8                       IfType;
} MAC_ADDR_DEVICE_PATH;

///
/// IPv4 Device Path SubType
///
#define MSG_IPv4_DP  0x0c
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// The local IPv4 address.
  ///
  EFI_IPv4_ADDRESS            LocalIpAddress;
  ///
  /// The remote IPv4 address.
  ///
  EFI_IPv4_ADDRESS            RemoteIpAddress;
  ///
  /// The local port number.
  ///
  UINT16                      LocalPort;
  ///
  /// The remote port number.
  ///
  UINT16                      RemotePort;
  ///
  /// The network protocol(i.e. UDP, TCP).
  ///
  UINT16                      Protocol;
  ///
  /// 0x00 - The Source IP Address was assigned though DHCP.
  /// 0x01 - The Source IP Address is statically bound.
  ///
  BOOLEAN                     StaticIpAddress;
  ///
  /// The gateway IP address
  ///
  EFI_IPv4_ADDRESS            GatewayIpAddress;
  ///
  /// The subnet mask
  ///
  EFI_IPv4_ADDRESS            SubnetMask;
} IPv4_DEVICE_PATH;

///
/// IPv6 Device Path SubType.
///
#define MSG_IPv6_DP  0x0d
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// The local IPv6 address.
  ///
  EFI_IPv6_ADDRESS            LocalIpAddress;
  ///
  /// The remote IPv6 address.
  ///
  EFI_IPv6_ADDRESS            RemoteIpAddress;
  ///
  /// The local port number.
  ///
  UINT16                      LocalPort;
  ///
  /// The remote port number.
  ///
  UINT16                      RemotePort;
  ///
  /// The network protocol(i.e. UDP, TCP).
  ///
  UINT16                      Protocol;
  ///
  /// 0x00 - The Local IP Address was manually configured.
  /// 0x01 - The Local IP Address is assigned through IPv6
  /// stateless auto-configuration.
  /// 0x02 - The Local IP Address is assigned through IPv6
  /// stateful configuration.
  ///
  UINT8                       IpAddressOrigin;
  ///
  /// The prefix length
  ///
  UINT8                       PrefixLength;
  ///
  /// The gateway IP address
  ///
  EFI_IPv6_ADDRESS            GatewayIpAddress;
} IPv6_DEVICE_PATH;

///
/// InfiniBand Device Path SubType.
///
#define MSG_INFINIBAND_DP  0x09
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Flags to help identify/manage InfiniBand device path elements:
  /// Bit 0 - IOC/Service (0b = IOC, 1b = Service).
  /// Bit 1 - Extend Boot Environment.
  /// Bit 2 - Console Protocol.
  /// Bit 3 - Storage Protocol.
  /// Bit 4 - Network Protocol.
  /// All other bits are reserved.
  ///
  UINT32    ResourceFlags;
  ///
  /// 128-bit Global Identifier for remote fabric port.
  ///
  UINT8     PortGid[16];
  ///
  /// 64-bit unique identifier to remote IOC or server process.
  /// Interpretation of field specified by Resource Flags (bit 0).
  ///
  UINT64    ServiceId;
  ///
  /// 64-bit persistent ID of remote IOC port.
  ///
  UINT64    TargetPortId;
  ///
  /// 64-bit persistent ID of remote device.
  ///
  UINT64    DeviceId;
} INFINIBAND_DEVICE_PATH;

#define INFINIBAND_RESOURCE_FLAG_IOC_SERVICE                0x01
#define INFINIBAND_RESOURCE_FLAG_EXTENDED_BOOT_ENVIRONMENT  0x02
#define INFINIBAND_RESOURCE_FLAG_CONSOLE_PROTOCOL           0x04
#define INFINIBAND_RESOURCE_FLAG_STORAGE_PROTOCOL           0x08
#define INFINIBAND_RESOURCE_FLAG_NETWORK_PROTOCOL           0x10

///
/// UART Device Path SubType.
///
#define MSG_UART_DP  0x0e
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Reserved.
  ///
  UINT32                      Reserved;
  ///
  /// The baud rate setting for the UART style device. A value of 0
  /// means that the device's default baud rate will be used.
  ///
  UINT64                      BaudRate;
  ///
  /// The number of data bits for the UART style device. A value
  /// of 0 means that the device's default number of data bits will be used.
  ///
  UINT8                       DataBits;
  ///
  /// The parity setting for the UART style device.
  /// Parity 0x00 - Default Parity.
  /// Parity 0x01 - No Parity.
  /// Parity 0x02 - Even Parity.
  /// Parity 0x03 - Odd Parity.
  /// Parity 0x04 - Mark Parity.
  /// Parity 0x05 - Space Parity.
  ///
  UINT8    Parity;
  ///
  /// The number of stop bits for the UART style device.
  /// Stop Bits 0x00 - Default Stop Bits.
  /// Stop Bits 0x01 - 1 Stop Bit.
  /// Stop Bits 0x02 - 1.5 Stop Bits.
  /// Stop Bits 0x03 - 2 Stop Bits.
  ///
  UINT8    StopBits;
} UART_DEVICE_PATH;

///
/// NVDIMM Namespace Device Path SubType.
///
#define NVDIMM_NAMESPACE_DP  0x20
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Namespace unique label identifier UUID.
  ///
  EFI_GUID                    Uuid;
} NVDIMM_NAMESPACE_DEVICE_PATH;

//
// Use VENDOR_DEVICE_PATH struct
//
#define MSG_VENDOR_DP  0x0a
typedef VENDOR_DEVICE_PATH VENDOR_DEFINED_DEVICE_PATH;

#define DEVICE_PATH_MESSAGING_PC_ANSI      EFI_PC_ANSI_GUID
#define DEVICE_PATH_MESSAGING_VT_100       EFI_VT_100_GUID
#define DEVICE_PATH_MESSAGING_VT_100_PLUS  EFI_VT_100_PLUS_GUID
#define DEVICE_PATH_MESSAGING_VT_UTF8      EFI_VT_UTF8_GUID

///
/// A new device path node is defined to declare flow control characteristics.
/// UART Flow Control Messaging Device Path
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// DEVICE_PATH_MESSAGING_UART_FLOW_CONTROL GUID.
  ///
  EFI_GUID                    Guid;
  ///
  /// Bitmap of supported flow control types.
  /// Bit 0 set indicates hardware flow control.
  /// Bit 1 set indicates Xon/Xoff flow control.
  /// All other bits are reserved and are clear.
  ///
  UINT32                      FlowControlMap;
} UART_FLOW_CONTROL_DEVICE_PATH;

#define UART_FLOW_CONTROL_HARDWARE  0x00000001
#define UART_FLOW_CONTROL_XON_XOFF  0x00000010

#define DEVICE_PATH_MESSAGING_SAS  EFI_SAS_DEVICE_PATH_GUID
///
/// Serial Attached SCSI (SAS) Device Path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// DEVICE_PATH_MESSAGING_SAS GUID.
  ///
  EFI_GUID                    Guid;
  ///
  /// Reserved for future use.
  ///
  UINT32                      Reserved;
  ///
  /// SAS Address for Serial Attached SCSI Target.
  ///
  UINT64                      SasAddress;
  ///
  /// SAS Logical Unit Number.
  ///
  UINT64                      Lun;
  ///
  /// More Information about the device and its interconnect.
  ///
  UINT16                      DeviceTopology;
  ///
  /// Relative Target Port (RTP).
  ///
  UINT16                      RelativeTargetPort;
} SAS_DEVICE_PATH;

///
/// Serial Attached SCSI (SAS) Ex Device Path SubType
///
#define MSG_SASEX_DP  0x16
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// 8-byte array of the SAS Address for Serial Attached SCSI Target Port.
  ///
  UINT8                       SasAddress[8];
  ///
  /// 8-byte array of the SAS Logical Unit Number.
  ///
  UINT8                       Lun[8];
  ///
  /// More Information about the device and its interconnect.
  ///
  UINT16                      DeviceTopology;
  ///
  /// Relative Target Port (RTP).
  ///
  UINT16                      RelativeTargetPort;
} SASEX_DEVICE_PATH;

///
/// NvmExpress Namespace Device Path SubType.
///
#define MSG_NVME_NAMESPACE_DP  0x17
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  UINT32                      NamespaceId;
  UINT64                      NamespaceUuid;
} NVME_NAMESPACE_DEVICE_PATH;

///
/// NVMe over Fabric (NVMe-oF) Namespace Device Path SubType.
///
#define MSG_NVME_OF_NAMESPACE_DP  0x22
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Namespace Identifier Type (NIDT)
  ///
  UINT8                       NamespaceIdType;
  ///
  /// Namespace Identifier (NID)
  ///
  UINT8                       NamespaceId[16];
  ///
  /// Unique identifier of an NVM subsystem
  ///
  CHAR8                       SubsystemNqn[];
} NVME_OF_NAMESPACE_DEVICE_PATH;

///
/// DNS Device Path SubType
///
#define MSG_DNS_DP  0x1F
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Indicates the DNS server address is IPv4 or IPv6 address.
  ///
  UINT8                       IsIPv6;
  ///
  /// Instance of the DNS server address.
  ///
  EFI_IP_ADDRESS              DnsServerIp[];
} DNS_DEVICE_PATH;

///
/// Uniform Resource Identifiers (URI) Device Path SubType
///
#define MSG_URI_DP  0x18
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Instance of the URI pursuant to RFC 3986.
  ///
  CHAR8                       Uri[];
} URI_DEVICE_PATH;

///
/// Universal Flash Storage (UFS) Device Path SubType.
///
#define MSG_UFS_DP  0x19
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Target ID on the UFS bus (PUN).
  ///
  UINT8                       Pun;
  ///
  /// Logical Unit Number (LUN).
  ///
  UINT8                       Lun;
} UFS_DEVICE_PATH;

///
/// SD (Secure Digital) Device Path SubType.
///
#define MSG_SD_DP  0x1A
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  UINT8                       SlotNumber;
} SD_DEVICE_PATH;

///
/// EMMC (Embedded MMC) Device Path SubType.
///
#define MSG_EMMC_DP  0x1D
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  UINT8                       SlotNumber;
} EMMC_DEVICE_PATH;

///
/// iSCSI Device Path SubType
///
#define MSG_ISCSI_DP  0x13
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Network Protocol (0 = TCP, 1+ = reserved).
  ///
  UINT16                      NetworkProtocol;
  ///
  /// iSCSI Login Options.
  ///
  UINT16                      LoginOption;
  ///
  /// iSCSI Logical Unit Number.
  ///
  UINT64                      Lun;
  ///
  /// iSCSI Target Portal group tag the initiator intends
  /// to establish a session with.
  ///
  UINT16                      TargetPortalGroupTag;
  ///
  /// iSCSI NodeTarget Name. The length of the name
  /// is determined by subtracting the offset of this field from Length.
  ///
  /// CHAR8                        iSCSI Target Name.
} ISCSI_DEVICE_PATH;

#define ISCSI_LOGIN_OPTION_NO_HEADER_DIGEST            0x0000
#define ISCSI_LOGIN_OPTION_HEADER_DIGEST_USING_CRC32C  0x0002
#define ISCSI_LOGIN_OPTION_NO_DATA_DIGEST              0x0000
#define ISCSI_LOGIN_OPTION_DATA_DIGEST_USING_CRC32C    0x0008
#define ISCSI_LOGIN_OPTION_AUTHMETHOD_CHAP             0x0000
#define ISCSI_LOGIN_OPTION_AUTHMETHOD_NON              0x1000
#define ISCSI_LOGIN_OPTION_CHAP_BI                     0x0000
#define ISCSI_LOGIN_OPTION_CHAP_UNI                    0x2000

///
/// VLAN Device Path SubType.
///
#define MSG_VLAN_DP  0x14
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// VLAN identifier (0-4094).
  ///
  UINT16                      VlanId;
} VLAN_DEVICE_PATH;

///
/// Bluetooth Device Path SubType.
///
#define MSG_BLUETOOTH_DP  0x1b
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// 48bit Bluetooth device address.
  ///
  BLUETOOTH_ADDRESS           BD_ADDR;
} BLUETOOTH_DEVICE_PATH;

///
/// Wi-Fi Device Path SubType.
///
#define MSG_WIFI_DP  0x1C
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Service set identifier. A 32-byte octets string.
  ///
  UINT8                       SSId[32];
} WIFI_DEVICE_PATH;

///
/// Bluetooth LE Device Path SubType.
///
#define MSG_BLUETOOTH_LE_DP  0x1E
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  BLUETOOTH_LE_ADDRESS        Address;
} BLUETOOTH_LE_DEVICE_PATH;

//
// Media Device Path
//
#define MEDIA_DEVICE_PATH  0x04

///
/// Hard Drive Media Device Path SubType.
///
#define MEDIA_HARDDRIVE_DP  0x01

///
/// The Hard Drive Media Device Path is used to represent a partition on a hard drive.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Describes the entry in a partition table, starting with entry 1.
  /// Partition number zero represents the entire device. Valid
  /// partition numbers for a MBR partition are [1, 4]. Valid
  /// partition numbers for a GPT partition are [1, NumberOfPartitionEntries].
  ///
  UINT32                      PartitionNumber;
  ///
  /// Starting LBA of the partition on the hard drive.
  ///
  UINT64                      PartitionStart;
  ///
  /// Size of the partition in units of Logical Blocks.
  ///
  UINT64                      PartitionSize;
  ///
  /// Signature unique to this partition:
  /// If SignatureType is 0, this field has to be initialized with 16 zeros.
  /// If SignatureType is 1, the MBR signature is stored in the first 4 bytes of this field.
  /// The other 12 bytes are initialized with zeros.
  /// If SignatureType is 2, this field contains a 16 byte signature.
  ///
  UINT8                       Signature[16];
  ///
  /// Partition Format: (Unused values reserved).
  /// 0x01 - PC-AT compatible legacy MBR.
  /// 0x02 - GUID Partition Table.
  ///
  UINT8                       MBRType;
  ///
  /// Type of Disk Signature: (Unused values reserved).
  /// 0x00 - No Disk Signature.
  /// 0x01 - 32-bit signature from address 0x1b8 of the type 0x01 MBR.
  /// 0x02 - GUID signature.
  ///
  UINT8                       SignatureType;
} HARDDRIVE_DEVICE_PATH;

#define MBR_TYPE_PCAT                        0x01
#define MBR_TYPE_EFI_PARTITION_TABLE_HEADER  0x02

#define NO_DISK_SIGNATURE    0x00
#define SIGNATURE_TYPE_MBR   0x01
#define SIGNATURE_TYPE_GUID  0x02

///
/// CD-ROM Media Device Path SubType.
///
#define MEDIA_CDROM_DP  0x02

///
/// The CD-ROM Media Device Path is used to define a system partition that exists on a CD-ROM.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Boot Entry number from the Boot Catalog. The Initial/Default entry is defined as zero.
  ///
  UINT32                      BootEntry;
  ///
  /// Starting RBA of the partition on the medium. CD-ROMs use Relative logical Block Addressing.
  ///
  UINT64                      PartitionStart;
  ///
  /// Size of the partition in units of Blocks, also called Sectors.
  ///
  UINT64                      PartitionSize;
} CDROM_DEVICE_PATH;

//
// Use VENDOR_DEVICE_PATH struct
//
#define MEDIA_VENDOR_DP  0x03           ///< Media vendor device path subtype.

///
/// File Path Media Device Path SubType
///
#define MEDIA_FILEPATH_DP  0x04
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// A NULL-terminated Path string including directory and file names.
  ///
  CHAR16                      PathName[1];
} FILEPATH_DEVICE_PATH;

#define SIZE_OF_FILEPATH_DEVICE_PATH  OFFSET_OF(FILEPATH_DEVICE_PATH,PathName)

///
/// Media Protocol Device Path SubType.
///
#define MEDIA_PROTOCOL_DP  0x05

///
/// The Media Protocol Device Path is used to denote the protocol that is being
/// used in a device path at the location of the path specified.
/// Many protocols are inherent to the style of device path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// The ID of the protocol.
  ///
  EFI_GUID                    Protocol;
} MEDIA_PROTOCOL_DEVICE_PATH;

///
/// PIWG Firmware File SubType.
///
#define MEDIA_PIWG_FW_FILE_DP  0x06

///
/// This device path is used by systems implementing the UEFI PI Specification 1.0 to describe a firmware file.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Firmware file name
  ///
  EFI_GUID                    FvFileName;
} MEDIA_FW_VOL_FILEPATH_DEVICE_PATH;

///
/// PIWG Firmware Volume Device Path SubType.
///
#define MEDIA_PIWG_FW_VOL_DP  0x07

///
/// This device path is used by systems implementing the UEFI PI Specification 1.0 to describe a firmware volume.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Firmware volume name.
  ///
  EFI_GUID                    FvName;
} MEDIA_FW_VOL_DEVICE_PATH;

///
/// Media relative offset range device path.
///
#define MEDIA_RELATIVE_OFFSET_RANGE_DP  0x08

///
/// Used to describe the offset range of media relative.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  UINT32                      Reserved;
  UINT64                      StartingOffset;
  UINT64                      EndingOffset;
} MEDIA_RELATIVE_OFFSET_RANGE_DEVICE_PATH;

///
/// This GUID defines a RAM Disk supporting a raw disk format in volatile memory.
///
#define EFI_VIRTUAL_DISK_GUID  EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_DISK_REGION_VOLATILE

extern  EFI_GUID  gEfiVirtualDiskGuid;

///
/// This GUID defines a RAM Disk supporting an ISO image in volatile memory.
///
#define EFI_VIRTUAL_CD_GUID  EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_CD_REGION_VOLATILE

extern  EFI_GUID  gEfiVirtualCdGuid;

///
/// This GUID defines a RAM Disk supporting a raw disk format in persistent memory.
///
#define EFI_PERSISTENT_VIRTUAL_DISK_GUID  EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_DISK_REGION_PERSISTENT

extern  EFI_GUID  gEfiPersistentVirtualDiskGuid;

///
/// This GUID defines a RAM Disk supporting an ISO image in persistent memory.
///
#define EFI_PERSISTENT_VIRTUAL_CD_GUID  EFI_ACPI_6_0_NFIT_GUID_RAM_DISK_SUPPORTING_VIRTUAL_CD_REGION_PERSISTENT

extern  EFI_GUID  gEfiPersistentVirtualCdGuid;

///
/// Media ram disk device path.
///
#define MEDIA_RAM_DISK_DP  0x09

///
/// Used to describe the ram disk device path.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Starting Memory Address.
  ///
  UINT32                      StartingAddr[2];
  ///
  /// Ending Memory Address.
  ///
  UINT32                      EndingAddr[2];
  ///
  /// GUID that defines the type of the RAM Disk.
  ///
  EFI_GUID                    TypeGuid;
  ///
  /// RAM Diskinstance number, if supported. The default value is zero.
  ///
  UINT16                      Instance;
} MEDIA_RAM_DISK_DEVICE_PATH;

///
/// BIOS Boot Specification Device Path.
///
#define BBS_DEVICE_PATH  0x05

///
/// BIOS Boot Specification Device Path SubType.
///
#define BBS_BBS_DP  0x01

///
/// This Device Path is used to describe the booting of non-EFI-aware operating systems.
///
typedef struct {
  EFI_DEVICE_PATH_PROTOCOL    Header;
  ///
  /// Device Type as defined by the BIOS Boot Specification.
  ///
  UINT16                      DeviceType;
  ///
  /// Status Flags as defined by the BIOS Boot Specification.
  ///
  UINT16                      StatusFlag;
  ///
  /// Null-terminated ASCII string that describes the boot device to a user.
  ///
  CHAR8                       String[1];
} BBS_BBS_DEVICE_PATH;

//
// DeviceType definitions - from BBS specification
//
#define BBS_TYPE_FLOPPY            0x01
#define BBS_TYPE_HARDDRIVE         0x02
#define BBS_TYPE_CDROM             0x03
#define BBS_TYPE_PCMCIA            0x04
#define BBS_TYPE_USB               0x05
#define BBS_TYPE_EMBEDDED_NETWORK  0x06
#define BBS_TYPE_BEV               0x80
#define BBS_TYPE_UNKNOWN           0xFF

///
/// Union of all possible Device Paths and pointers to Device Paths.
///
typedef union {
  EFI_DEVICE_PATH_PROTOCOL                   DevPath;
  PCI_DEVICE_PATH                            Pci;
  PCCARD_DEVICE_PATH                         PcCard;
  MEMMAP_DEVICE_PATH                         MemMap;
  VENDOR_DEVICE_PATH                         Vendor;

  CONTROLLER_DEVICE_PATH                     Controller;
  BMC_DEVICE_PATH                            Bmc;
  ACPI_HID_DEVICE_PATH                       Acpi;
  ACPI_EXTENDED_HID_DEVICE_PATH              ExtendedAcpi;
  ACPI_ADR_DEVICE_PATH                       AcpiAdr;

  ATAPI_DEVICE_PATH                          Atapi;
  SCSI_DEVICE_PATH                           Scsi;
  ISCSI_DEVICE_PATH                          Iscsi;
  FIBRECHANNEL_DEVICE_PATH                   FibreChannel;
  FIBRECHANNELEX_DEVICE_PATH                 FibreChannelEx;

  F1394_DEVICE_PATH                          F1394;
  USB_DEVICE_PATH                            Usb;
  SATA_DEVICE_PATH                           Sata;
  USB_CLASS_DEVICE_PATH                      UsbClass;
  USB_WWID_DEVICE_PATH                       UsbWwid;
  DEVICE_LOGICAL_UNIT_DEVICE_PATH            LogicUnit;
  I2O_DEVICE_PATH                            I2O;
  MAC_ADDR_DEVICE_PATH                       MacAddr;
  IPv4_DEVICE_PATH                           Ipv4;
  IPv6_DEVICE_PATH                           Ipv6;
  VLAN_DEVICE_PATH                           Vlan;
  INFINIBAND_DEVICE_PATH                     InfiniBand;
  UART_DEVICE_PATH                           Uart;
  UART_FLOW_CONTROL_DEVICE_PATH              UartFlowControl;
  SAS_DEVICE_PATH                            Sas;
  SASEX_DEVICE_PATH                          SasEx;
  NVME_NAMESPACE_DEVICE_PATH                 NvmeNamespace;
  NVME_OF_NAMESPACE_DEVICE_PATH              NvmeOfNamespace;
  DNS_DEVICE_PATH                            Dns;
  URI_DEVICE_PATH                            Uri;
  BLUETOOTH_DEVICE_PATH                      Bluetooth;
  WIFI_DEVICE_PATH                           WiFi;
  UFS_DEVICE_PATH                            Ufs;
  SD_DEVICE_PATH                             Sd;
  EMMC_DEVICE_PATH                           Emmc;
  HARDDRIVE_DEVICE_PATH                      HardDrive;
  CDROM_DEVICE_PATH                          CD;

  FILEPATH_DEVICE_PATH                       FilePath;
  MEDIA_PROTOCOL_DEVICE_PATH                 MediaProtocol;

  MEDIA_FW_VOL_DEVICE_PATH                   FirmwareVolume;
  MEDIA_FW_VOL_FILEPATH_DEVICE_PATH          FirmwareFile;
  MEDIA_RELATIVE_OFFSET_RANGE_DEVICE_PATH    Offset;
  MEDIA_RAM_DISK_DEVICE_PATH                 RamDisk;
  BBS_BBS_DEVICE_PATH                        Bbs;
} EFI_DEV_PATH;

typedef union {
  EFI_DEVICE_PATH_PROTOCOL                   *DevPath;
  PCI_DEVICE_PATH                            *Pci;
  PCCARD_DEVICE_PATH                         *PcCard;
  MEMMAP_DEVICE_PATH                         *MemMap;
  VENDOR_DEVICE_PATH                         *Vendor;

  CONTROLLER_DEVICE_PATH                     *Controller;
  BMC_DEVICE_PATH                            *Bmc;
  ACPI_HID_DEVICE_PATH                       *Acpi;
  ACPI_EXTENDED_HID_DEVICE_PATH              *ExtendedAcpi;
  ACPI_ADR_DEVICE_PATH                       *AcpiAdr;

  ATAPI_DEVICE_PATH                          *Atapi;
  SCSI_DEVICE_PATH                           *Scsi;
  ISCSI_DEVICE_PATH                          *Iscsi;
  FIBRECHANNEL_DEVICE_PATH                   *FibreChannel;
  FIBRECHANNELEX_DEVICE_PATH                 *FibreChannelEx;

  F1394_DEVICE_PATH                          *F1394;
  USB_DEVICE_PATH                            *Usb;
  SATA_DEVICE_PATH                           *Sata;
  USB_CLASS_DEVICE_PATH                      *UsbClass;
  USB_WWID_DEVICE_PATH                       *UsbWwid;
  DEVICE_LOGICAL_UNIT_DEVICE_PATH            *LogicUnit;
  I2O_DEVICE_PATH                            *I2O;
  MAC_ADDR_DEVICE_PATH                       *MacAddr;
  IPv4_DEVICE_PATH                           *Ipv4;
  IPv6_DEVICE_PATH                           *Ipv6;
  VLAN_DEVICE_PATH                           *Vlan;
  INFINIBAND_DEVICE_PATH                     *InfiniBand;
  UART_DEVICE_PATH                           *Uart;
  UART_FLOW_CONTROL_DEVICE_PATH              *UartFlowControl;
  SAS_DEVICE_PATH                            *Sas;
  SASEX_DEVICE_PATH                          *SasEx;
  NVME_NAMESPACE_DEVICE_PATH                 *NvmeNamespace;
  NVME_OF_NAMESPACE_DEVICE_PATH              *NvmeOfNamespace;
  DNS_DEVICE_PATH                            *Dns;
  URI_DEVICE_PATH                            *Uri;
  BLUETOOTH_DEVICE_PATH                      *Bluetooth;
  WIFI_DEVICE_PATH                           *WiFi;
  UFS_DEVICE_PATH                            *Ufs;
  SD_DEVICE_PATH                             *Sd;
  EMMC_DEVICE_PATH                           *Emmc;
  HARDDRIVE_DEVICE_PATH                      *HardDrive;
  CDROM_DEVICE_PATH                          *CD;

  FILEPATH_DEVICE_PATH                       *FilePath;
  MEDIA_PROTOCOL_DEVICE_PATH                 *MediaProtocol;

  MEDIA_FW_VOL_DEVICE_PATH                   *FirmwareVolume;
  MEDIA_FW_VOL_FILEPATH_DEVICE_PATH          *FirmwareFile;
  MEDIA_RELATIVE_OFFSET_RANGE_DEVICE_PATH    *Offset;
  MEDIA_RAM_DISK_DEVICE_PATH                 *RamDisk;
  BBS_BBS_DEVICE_PATH                        *Bbs;
  UINT8                                      *Raw;
} EFI_DEV_PATH_PTR;

#pragma pack()

#define END_DEVICE_PATH_TYPE              0x7f
#define END_ENTIRE_DEVICE_PATH_SUBTYPE    0xFF
#define END_INSTANCE_DEVICE_PATH_SUBTYPE  0x01

extern EFI_GUID  gEfiDevicePathProtocolGuid;

#endif