UEFI规范2.3:下一代BIOS开发标准详解

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"UEFI SPEC. 2.3 是统一可扩展固件接口(Unified Extensible Firmware Interface)的规范版本,是2009年5月发布的开发下一代UEFI BIOS的标准文档。该规范旨在替代传统的BIOS系统,提供更安全、高效且用户友好的启动过程。UEFI的主要目标是改善系统引导的性能、安全性和可扩展性,同时提供一个标准化的平台供硬件厂商和软件开发者使用。" UEFI规范详细解释: 1. **概述**:UEFI 是一种开放的固件标准,用于定义计算机在启动时与操作系统交互的方式。它提供了一种现代化的、基于图形界面的环境,与传统BIOS相比,UEFI提供了更多的功能和更高的性能。 2. **版本2.3**:这个版本对UEFI规范进行了更新和增强,可能包括错误修复、新功能的引入以及对旧版不兼容问题的解决。通常,每个新版本都会提高兼容性和稳定性。 3. **功能特点**: - **图形化用户界面**:UEFI提供了一个图形化的预操作系统环境,用户可以更容易地进行设置和故障排除。 - **64位支持**:UEFI支持64位架构,允许更大的内存访问,这对于高性能计算和服务器环境至关重要。 - **安全启动**:通过验证加载的固件和操作系统组件的数字签名,UEFI提高了系统启动的安全性,防止恶意代码篡改启动流程。 - **模块化设计**:UEFI由一系列称为“模块”的独立功能组成,这些模块可以独立更新,简化了维护和升级。 - **快速启动**:UEFI的固件设计允许更快的系统启动和关机时间,提高了用户体验。 4. **开发者角度**:UEFI规范为硬件制造商和软件开发者提供了一套清晰的接口和编程指南,使他们能够开发与UEFI兼容的驱动程序和应用程序。 5. **免责声明**:尽管UEFI提供了标准化,但文档中明确指出,提供的信息“按原样”提供,不包含任何明示或暗示的知识产权许可,并且没有其他保证。设计师必须自行承担风险,不能依赖于标记为“保留”或“未定义”的任何特性或指令。 6. **适用范围**:UEFI规范适用于个人电脑、服务器、嵌入式系统等各种类型的计算设备,旨在创建一个统一的固件环境,促进跨平台的兼容性。 UEFI规范的实施对于现代计算机系统的进步起到了关键作用,它的出现推动了固件技术的发展,提高了系统安全性和整体性能。随着技术的不断进步,UEFI规范也在持续演进,以适应新的硬件和软件需求。
2020-03-11 上传
This Unified Extensible Firmware Interface (UEFI) Specification describes an interface between the operating system (OS) and the platform firmware. UEFI was preceded by the Extensible Firmware Interface Specification 1.10 (EFI). As a result, some code and certain protocol names retain the EFI designation. Unless otherwise noted, EFI designations in this specification may be assumed to be part of UEFI. The interface is in the form of data tables that contain platform-related information, and boot and runtime service calls that are available to the OS loader and the OS. Together, these provide a standard environment for booting an OS. This specification is designed as a pure interface specification. As such, the specification defines the set of interfaces and structures that platform firmware must implement. Similarly, the specification defines the set of interfaces and structures that the OS may use in booting. How either the firmware developer chooses to implement the required elements or the OS developer chooses to make use of those interfaces and structures is an implementation decision left for the developer. The intent of this specification is to define a way for the OS and platform firmware to communicate only information necessary to support the OS boot process. This is accomplished through a formal and complete abstract specification of the software-visible interface presented to the OS by the platform and firmware. Using this formal definition, a shrink-wrap OS intended to run on platforms compatible with supported processor specifications will be able to boot on a variety of system designs without further platform or OS customization. The definition will also allow for platform innovation to introduce new features and functionality that enhance platform capability without requiring new code to be written in the OS boot sequence. Furthermore, an abstract specification opens a route to replace legacy devices and firmware code over time. New device types and associated code can provide equivalent functionality through the same defined abstract interface, again without impact on the OS boot support code. The specification is applicable to a full range of hardware platforms from mobile systems to servers. The specification provides a core set of services along with a selection of protocol interfaces. The selection of protocol interfaces can evolve over time to be optimized for various platform market segments. At the same time, the specification allows maximum extensibility and customization abilities for OEMs to allow differentiation. In this, the purpose of UEFI is to define an evolutionary path from the traditional “PC-AT”- style boot world into a legacy-API free environment.