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<li class="toctree-l2"><a class="reference internal" href="../chapter5/1process.html">与进程有关的重要系统调用</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/2core-data-structures.html">进程管理的核心数据结构</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter6/2fs-implementation-1.html">简易文件系统 easy-fs (上)</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter6/2fs-implementation-2.html">简易文件系统 easy-fs (下)</a></li>
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<h1>附录 C：深入机器模式：RustSBI<a class="headerlink" href="#c-rustsbi" title="永久链接至标题">¶</a></h1>
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<p>RISC-V指令集的SBI标准规定了类Unix操作系统之下的运行环境规范。这个规范拥有多种实现，RustSBI是它的一种实现。</p>
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<p>RISC-V架构中，存在着定义于操作系统之下的运行环境。这个运行环境不仅将引导启动RISC-V下的操作系统， 还将常驻后台，为操作系统提供一系列二进制接口，以便其获取和操作硬件信息。 RISC-V给出了此类环境和二进制接口的规范，称为“操作系统二进制接口”，即“SBI”。</p>
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<p>SBI的实现是在M模式下运行的特定于平台的固件，它将管理S、U等特权上的程序或通用的操作系统。</p>
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<p>RustSBI项目发起于鹏城实验室的“rCore代码之夏-2020”活动，它是完全由Rust语言开发的SBI实现。 现在它能够在支持的RISC-V设备上运行rCore教程和其它操作系统内核。</p>
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<p>RustSBI项目的目标是，制作一个从固件启动的最小Rust语言SBI实现，为可能的复杂实现提供参考和支持。 RustSBI也可以作为一个库使用，帮助更多的SBI开发者适配自己的平台，以支持更多处理器核和片上系统。</p>
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