Efi device path protocol. Introduction This section adds two device path node types that describe files stored in firmware volumes: Firmware File Media Device Path Firmware Volume Step to UEFI (43） —– 取得当前目录的 EFI_DEVICE_PATH_PROTOCOL 在 EFI_SHELL_PROTOCOL 中提供了 extern EFI_GUID gEfiDriverBindingProtocolGuid; EFI_HANDLE DriverImageHandle; EFI_HANDLE ControllerHandle; UEFI Driver Development Guide for Network Boot Devices This development guide lists required, recommended, and optional UEFI protocols and elements for network boot device drivers, such as C. An example system design is presented along with its DevicePath A pointer to device path data. This Device Path can describe physical messaging information like SCSI ID, or abstract physical device or logical device. This protocol is required by Windows on Arm 15. EFI_LOADED_IMAGE_PROTOCOL 提供已加载到内存中的映像信息。 typedef struct { UINT32 Revision; EFI_HANDLE ParentHandle; EFI_System_Table 1 Device Path 设备路径Device Path用于定义到设备的编程路径，设备路径的主要目的是让一个应用程序（例如OS加载器）确定接口正在抽象的设备的物理设备。 设备路径的集合通常称为 从类型名 EFI_DEVICE_PATH_PROTOCOL 可以看出，其中的 FilePath 这项就是已加载镜像的设备路径。 使用OpenProtocol ()获取EFI_LOADED_IMAGE_PROTOCOL 要得到已加载镜像的 1. Internally Device path consists from the so 10. This appendix presents an example EFI Device Path and explains its relationship to the ACPI name space. Such code may include protocols that manage device access or extend platform capability, as well as applications running in the preboot environment, and OS Print (L"PciDevicePathNodeStatic: %s\n", ConvertDeviceNodeToText ( (EFI_DEVICE_PATH_PROTOCOL*) &PciDevicePathNodeStatic, FALSE, FALSE)); 要获取设备的路径，需要在 DeviceHandle 上调用 OpenProtocol() 函数来打开 EFI_DEVICE_PATH_PROTOCOL 的接口。 如图4. EFI Device Path Protocol This section provides a detailed description of EFI_DEVICE_PATH_PROTOCOL. Protocols – Device Path Protocol This section contains the definition of the device path protocol and the information needed to construct and manage device paths in the UEFI environment. 19所示，这一过程很像 4. @param Terminology: Device Paths, Device Path Instances, and Device Path Nodes An open UEFI device path Protocol, also called device path, is a flexible and structured sequence of binary nodes that 最近做了一个关于 Image 的 Device Path 的实验，比较简单，分享一下。 首先是根据当前 Application 的 ImageHandle 取得对应的 Handle。使用 Terminology: Device Paths, Device Path Instances, and Device Path Nodes An open UEFI device path Protocol, also called device path, is a flexible and structured sequence of binary nodes that HardDriveMediaDevicePath *path2=(HardDriveMediaDevicePath *)path; Print(L" PartitionNumber:%d \n PartitionStart:0x%lx \n Converts a generic text device path node to device path structure. 设备路径的主要目的是允许应用程序 (如操作系统加载程序)确定接口正在抽象的物理设备。 2. \test. efi，它实际上是“文件的路径”。而完整的设备路径，正是它们两者的组合。 EFI_DEVICE_PATH_PROTOCOL是UEFI中的一个关键协议，用于获取设备的路径信息。 设备路径节点有多种类型，用于表示不同种类的设备。 文章还列举了设备路径节点的结构及其组件 This protocol can be used on any device handle to obtain generic path/location information concerning the physical device or logical device. Protocols - Device Path Protocol 8. A Device Path is used to define the programmatic path to a device in UEFI environment. 1 EFI Loaded Image Protocol. This allows the operating system to maintain a view This protocol can be used on any device handle to obtain generic path/location information concerning the physical device or logical device. The 在该Controller Handle下安装1个Device Path Protocol，也就是创建1个Device Path。 创建Device Path的方法是：先为该Child Device创建对应 UEFI SPEC只要求为系统中的Physical Device创建Device Path，而Virtual Device是无需创建Device Path的。 每个Physical Device都会对应1 创建设备路径 上一节中我们介绍了用来把设备路径转换为字符串的函数 ConvertDevicePathToText()。与之相对应地，UEFI标准中还有用来把字符串转换为设备路径的函数，它就是 9 Protocols - EFI Loaded Image248 9. The size of the Device Path can be determined from the structures that make up the 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 You need to get the device path of the parent device (the partition from which your bootloader was loaded) via the EFI_LOADED_IMAGE_PROTOCOL protocol. 1 EFI_LOADED_IMAGE_PROTOCOL. Device Path Examples ¶ This appendix presents an example EFI Device Path and explains its relationship to the ACPI name space. The 1. Introduction ¶ This section adds two device path node types that describe files stored in firmware volumes: Firmware File Media Device Path Firmware In this lesson we will talk about DevicePath concept in UEFI. These This service locates a device handle that supports a specific protocol and has the closest matching device path. Summary Can be used on any device handle to obtain generic 9. 248 USB总线驱动使用 EFI_USB2_HC_PROTOCOL 提供的服务。USB总线驱动会发现USB总线上连接的USB设备。在本例中，USB总线发现了一个USB键盘，一 The boot manager will enumerate all LoadFile protocol instances, and invoke LoadFile protocol with FilePath set to the short-form device path during the matching process. Protocols - Device Path Protocol ¶ 8. Protocols – Device Path Protocol ¶ This section contains the definition of the device path protocol and the information needed to construct and manage device paths in the UEFI 1. 2 describes the PCI Root Bridge I/O Protocol in detail, and Section 14. 248 9. 对上述每个Device Handle 使DXE阶段过渡到BDS阶段。 Device Path Protocol Device Path Protocol是一种纯数据的结构体，它表示的是一个设备的可编程路径，可以简称就是Device Device Paths Relevant source files Device paths are hierarchical data structures defined by the UEFI specification that describe the location of hardware devices, files, and 8. 1 查看当前设备路径 中 . If the handle does not logically map to a physical device, the handle may not necessarily support the device path protocol. 先找到Support EFI_BLOCK_IO_PROTOCOL的所有Device Handle，每个Device Handle代表1个Block设备，会被分配1个BLKx:。 2. @return A pointer to 一、概述 1. 对上 其中的红框部分就是一个个Device Path的字符串表示。 通过UEFI提供的接口ConvertDevicePathToText ()，可以将Device Path结构体转换 在该Controller Handle下安装1个Device Path Protocol，也就是创建1个Device Path。 创建Device Path的方法是：先为该Child Device创建对应的Device Initialization at this stage involves assigning EFI device paths to the hardware connected to the motherboard, and transferring configuration data to the hardware. 7k次，点赞4次，收藏12次。本文介绍了如何在UEFI环境中通过EFI_DEVICE_PATH_TO_TEXT_PROTOCOL协议将设备路径 Section Section 14. Protocols — SCSI Driver Models and Bus Support ¶ The intent of this chapter is to specify a method of providing direct access to SCSI devices. 先找到Support EFI_BLOCK_IO_PROTOCOL 的所有Device Handle，每个Device Handle代表1个Block设备，会被分配1个BLKx:。 2. Respectively, these protocols describe an 10. Although a rare requirement, it is useful when a UEFI Driver needs to find an I/O 7. 2. What is Device Path Device Path ProtocolWhy is UEFI to ask Device Path's design? The primary purpose of a Device Path is to allow an application, such as an OS The EFI_USB_IO_PROTOCOL and EFI_DEVICE_PATH_PROTOCOL are attached to the device handle so that the USB controller can be accessed. ACPI中定义了设备路径的 集合 叫做命名空间 (name space)，EFI定义了自己的命名 My solution was to get the LOADED_IMAGE_PROTOCOL of my running application, get the device path from there (hoping that it is a file path 2. The field you need is This page documents the device path system implementation, including structure definitions, type classifications, manipulation functions, and string conversion capabilities. This Device Path is used to describe the connection of devices outside the resource domain of the system. If the handle does not logically map to a physical device, the 8. 1. UEFI Protocols 1. 19 describes how to build device paths for PCI Root Bridges. EFI Device Path Protocol,GUID & Protocol Interface Structure The executing UEFI Image may use the device path to match its own device 文章浏览阅读2. @param Type The type of the device path node. A This protocol can be used on any device handle to obtain generic path/location information concerning the physical device or logical device. An example system **/ EFI_DEVICE_PATH_PROTOCOL * EFIAPI ConvertTextToDeviceNode ( IN CONST CHAR16 *TextDeviceNode ); /** Convert text to the binary representation of a device path. /// #define MEDIA_RELATIVE_OFFSET_RANGE_DP 0x08 /// /// Used to describe the offset 10. EFI_LOADED_IMAGE_PROTOCOL 提供已加载到内存中的映像信息。 typedef struct { UINT32 Revision; EFI_HANDLE ParentHandle; EFI_System_Table UEFI Specification 2. Device path's actual use 1. Internally Device path consists from the so called Device Path nodes which directly follow each other in memory. /// EFI_GUID FvName; } MEDIA_FW_VOL_DEVICE_PATH; /// /// Media relative offset range device path. The Device Path was designed so that the OS loader and the operating system could tell which devices the platform firmware was using as boot devices. If the handle does not logically map to a physical device, the An open UEFI device path Protocol, also called device path, is a flexible and structured sequence of binary nodes that describes a route from the UEFI root to a particular device, controller, or file. 对上述每个Device Handle Locate到其Device 前言 最近在写小功能，其中需要把信息以文件的形式保存在U盘上。U盘是一个存储设备，可以用 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL 把找 UEFI Arm multiprocessor startup requirements Microsoft has developed a protocol for starting multiple Arm cores on a multi-processor UEFI platform. The device path describes the location of the device the handle is for. . @param TextDeviceNode The input text device path node. 10 ¶ Acknowledgments The material contained herein is not a license, either expressly or impliedly, to any intellectual property owned or controlled by any of the UEFI Protocols 1. Protocols - EFI Loaded Image ¶ This section defines EFI_LOADED_IMAGE_PROTOCOL and the EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL. If the handle does not logically map to a physical device, the If the device does not support the file system protocol, the firmware then attempts to read the file via the EFI_LOAD_FILE_PROTOCOL and the LoadFile () 创建完整的设备路径 现在，我们有了两个“路径”。一个是 PciRoot 开头的“设备的路径”；另一个是我们之前称作设备路径的. iwj, nyp, oll, qeb, spb, luw, tos, clw, cnh, dyz, zgp, elw, utp, qoa, dwc, \