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<li class="toctree-l2"><a class="reference internal" href="../chapter4/3sv39-implementation-1.html">实现 SV39 多级页表机制（上）</a></li>
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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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|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<p class="caption" role="heading"><span class="caption-text">附录</span></p>
|
||
<ul>
|
||
<li class="toctree-l1 has-children"><a class="reference internal" href="../appendix-a/index.html">附录 A：Rust 系统编程资料</a><input class="toctree-checkbox" id="toctree-checkbox-17" name="toctree-checkbox-17" role="switch" type="checkbox"/><label for="toctree-checkbox-17"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1 has-children"><a class="reference internal" href="../appendix-b/index.html">附录 B：常见工具的使用方法</a><input class="toctree-checkbox" id="toctree-checkbox-18" name="toctree-checkbox-18" role="switch" type="checkbox"/><label for="toctree-checkbox-18"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1 has-children"><a class="reference internal" href="../appendix-c/index.html">附录 C：深入机器模式：RustSBI</a><input class="toctree-checkbox" id="toctree-checkbox-19" name="toctree-checkbox-19" role="switch" type="checkbox"/><label for="toctree-checkbox-19"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1"><a class="reference internal" href="../appendix-d/index.html">附录 D：RISC-V相关信息</a></li>
|
||
</ul>
|
||
<p class="caption" role="heading"><span class="caption-text">开发注记</span></p>
|
||
<ul>
|
||
<li class="toctree-l1 has-children"><a class="reference internal" href="../setup-sphinx.html">修改和构建本项目</a><input class="toctree-checkbox" id="toctree-checkbox-20" name="toctree-checkbox-20" role="switch" type="checkbox"/><label for="toctree-checkbox-20"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
|
||
</ul>
|
||
</li>
|
||
<li class="toctree-l1 has-children"><a class="reference internal" href="../rest-example.html">reStructuredText 基本语法</a><input class="toctree-checkbox" id="toctree-checkbox-21" name="toctree-checkbox-21" role="switch" type="checkbox"/><label for="toctree-checkbox-21"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="simple">
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
</aside>
|
||
<div class="main">
|
||
<div class="content">
|
||
<article role="main">
|
||
<div class="content-icon-container">
|
||
<div class="theme-toggle-container theme-toggle-content">
|
||
<button class="theme-toggle">
|
||
<div class="visually-hidden">Toggle Light / Dark / Auto color theme</div>
|
||
<svg class="theme-icon-when-auto"><use href="#svg-sun-half"></use></svg>
|
||
<svg class="theme-icon-when-dark"><use href="#svg-moon"></use></svg>
|
||
<svg class="theme-icon-when-light"><use href="#svg-sun"></use></svg>
|
||
</button>
|
||
</div>
|
||
<label class="toc-overlay-icon toc-content-icon" for="__toc">
|
||
<div class="visually-hidden">Toggle table of contents sidebar</div>
|
||
<i class="icon"><svg><use href="#svg-toc"></use></svg></i>
|
||
</label>
|
||
</div>
|
||
<div class="section" id="chapter3">
|
||
<h1>chapter3练习<a class="headerlink" href="#chapter3" title="永久链接至标题">¶</a></h1>
|
||
<div class="section" id="lab1">
|
||
<h2>Lab1 编程作业<a class="headerlink" href="#lab1" title="永久链接至标题">¶</a></h2>
|
||
<div class="section" id="id1">
|
||
<h3>获取任务信息<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h3>
|
||
<p>ch3 中，我们的系统已经能够支持多个任务分时轮流运行，我们希望引入一个新的系统调用 <code class="docutils literal notranslate"><span class="pre">sys_task_info</span></code> 以获取当前任务的信息，定义如下：</p>
|
||
<div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">fn</span> <span class="nf">sys_task_info</span><span class="p">(</span><span class="n">ti</span>: <span class="o">*</span><span class="k">mut</span><span class="w"> </span><span class="n">TaskInfo</span><span class="p">)</span><span class="w"> </span>-> <span class="kt">isize</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li><p>syscall ID: 410</p></li>
|
||
<li><p>查询当前正在执行的任务信息，任务信息包括任务控制块相关信息（任务状态）、任务使用的系统调用及调用次数、任务总运行时长（单位ms）。</p></li>
|
||
</ul>
|
||
<div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span> <span class="nc">TaskInfo</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
|
||
<span class="w"> </span><span class="n">status</span>: <span class="nc">TaskStatus</span><span class="p">,</span><span class="w"></span>
|
||
<span class="w"> </span><span class="n">syscall_times</span>: <span class="p">[</span><span class="kt">u32</span><span class="p">;</span><span class="w"> </span><span class="n">MAX_SYSCALL_NUM</span><span class="p">],</span><span class="w"></span>
|
||
<span class="w"> </span><span class="n">time</span>: <span class="kt">usize</span>
|
||
<span class="p">}</span><span class="w"></span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li><dl class="simple">
|
||
<dt>参数：</dt><dd><ul>
|
||
<li><p>ti: 待查询任务信息</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
</li>
|
||
<li><p>返回值：执行成功返回0，错误返回-1</p></li>
|
||
<li><dl class="simple">
|
||
<dt>说明：</dt><dd><ul>
|
||
<li><p>相关结构已在框架中给出，只需添加逻辑实现功能需求即可。</p></li>
|
||
<li><p>在我们的实验中，系统调用号一定小于 500，所以直接使用一个长为 <code class="docutils literal notranslate"><span class="pre">MAX_SYSCALL_NUM=500</span></code> 的数组做桶计数。</p></li>
|
||
<li><p>运行时间 time 返回系统调用时刻距离任务第一次被调度时刻的时长，也就是说这个时长可能包含该任务被其他任务抢占后的等待重新调度的时间。</p></li>
|
||
<li><p>由于查询的是当前任务的状态，因此 TaskStatus 一定是 Running。（助教起初想设计根据任务 id 查询，但是既不好定义任务 id 也不好写测例，遂放弃 QAQ）</p></li>
|
||
<li><p>调用 <code class="docutils literal notranslate"><span class="pre">sys_task_info</span></code> 也会对本次调用计数。</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
</li>
|
||
<li><dl class="simple">
|
||
<dt>提示：</dt><dd><ul>
|
||
<li><p>大胆修改已有框架！除了配置文件，你几乎可以随意修改已有框架的内容。</p></li>
|
||
<li><p>程序运行时间可以通过调用 <code class="docutils literal notranslate"><span class="pre">get_time()</span></code> 获取，注意任务运行总时长的单位是 ms。</p></li>
|
||
<li><p>系统调用次数可以考虑在进入内核态系统调用异常处理函数之后，进入具体系统调用函数之前维护。</p></li>
|
||
<li><p>阅读 TaskManager 的实现，思考如何维护内核控制块信息（可以在控制块可变部分加入需要的信息）。</p></li>
|
||
</ul>
|
||
</dd>
|
||
</dl>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="section" id="id2">
|
||
<h3>实验要求<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h3>
|
||
<ul class="simple">
|
||
<li><p><a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/tree/main/os3-ref">lab1(os3)参考框架:</a></p></li>
|
||
<li><p>实验目录要求</p></li>
|
||
</ul>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>├── os3(内核实现)
|
||
│ ├── Cargo.toml(配置文件)
|
||
│ └── src(所有内核的源代码放在 os/src 目录下)
|
||
│ ├── main.rs(内核主函数)
|
||
│ └── ...
|
||
├── reports (不是 report)
|
||
│ ├── lab1.md/pdf
|
||
│ └── ...
|
||
├── ...
|
||
</pre></div>
|
||
</div>
|
||
<ul>
|
||
<li><p>开发并通过所有测例：</p>
|
||
<blockquote>
|
||
<div><p>在 <code class="docutils literal notranslate"><span class="pre">YOUR_LAB1_REPO_DIR</span></code> 下进行编码（可学习参考 <code class="docutils literal notranslate"><span class="pre">os3-ref/src</span></code> 目录下的源代码，并在 <code class="docutils literal notranslate"><span class="pre">os3/src</span></code> 中完成编码），并进行编译测试。</p>
|
||
<p>CI 使用的测例与本地相同，测试中，user 文件夹及其它与构建相关的文件将被替换，请不要试图依靠硬编码通过测试。</p>
|
||
<p>在 <code class="docutils literal notranslate"><span class="pre">os3</span></code> 目录下，默认情况下，makefile 仅编译基础测例 (<code class="docutils literal notranslate"><span class="pre">BASE=1</span></code>)，即无需修改框架即可正常运行的测例。
|
||
你需要在编译时指定 <code class="docutils literal notranslate"><span class="pre">BASE=0</span></code> 控制框架仅编译实验测例（在 os 目录执行 <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">run</span> <span class="pre">BASE=0</span></code>），
|
||
或指定 <code class="docutils literal notranslate"><span class="pre">BASE=2</span></code> 控制框架同时编译基础测例和实验测例。</p>
|
||
</div></blockquote>
|
||
</li>
|
||
</ul>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">注解</p>
|
||
<p><strong>测试方式</strong></p>
|
||
<p>你的实现只需且必须通过测例，建议读者感到困惑时先检查测例</p>
|
||
<p>如果实现正确，可在项目仓库的根目录下执行 <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">test3</span></code> ，应该看到类似如下的显示输出：</p>
|
||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span> YOUR_LAB1_DIR
|
||
<span class="gp">$ </span>make test3
|
||
<span class="go">......</span>
|
||
<span class="go">[rustsbi] RustSBI version 0.2.2, adapting to RISC-V SBI v1.0.0</span>
|
||
<span class="go">.______ __ __ _______.___________. _______..______ __</span>
|
||
<span class="go">| _ \ | | | | / | | / || _ \ | |</span>
|
||
<span class="go">| |_) | | | | | | (----`---| |----`| (----`| |_) || |</span>
|
||
<span class="go">| / | | | | \ \ | | \ \ | _ < | |</span>
|
||
<span class="go">| |\ \----.| `--' |.----) | | | .----) | | |_) || |</span>
|
||
<span class="go">| _| `._____| \______/ |_______/ |__| |_______/ |______/ |__|</span>
|
||
<span class="go">[rustsbi] Implementation : RustSBI-QEMU Version 0.1.1</span>
|
||
<span class="go">[rustsbi] Platform Name : riscv-virtio,qemu</span>
|
||
<span class="go">[rustsbi] Platform SMP : 1</span>
|
||
<span class="go">[rustsbi] Platform Memory : 0x80000000..0x88000000</span>
|
||
<span class="go">[rustsbi] Boot HART : 0</span>
|
||
<span class="go">[rustsbi] Device Tree Region : 0x87000000..0x87000ef2</span>
|
||
<span class="go">[rustsbi] Firmware Address : 0x80000000</span>
|
||
<span class="go">[rustsbi] Supervisor Address : 0x80200000</span>
|
||
<span class="go">[rustsbi] pmp01: 0x00000000..0x80000000 (-wr)</span>
|
||
<span class="go">[rustsbi] pmp02: 0x80000000..0x80200000 (---)</span>
|
||
<span class="go">[rustsbi] pmp03: 0x80200000..0x88000000 (xwr)</span>
|
||
<span class="go">......</span>
|
||
<span class="go">[PASS] found <Hello, world from user mode program!></span>
|
||
<span class="go">[PASS] found <Test power_3 OK63518!></span>
|
||
<span class="go">[PASS] found <Test power_5 OK63518!></span>
|
||
<span class="go">[PASS] found <Test power_7 OK63518!></span>
|
||
<span class="go">[PASS] found <get_time OK63518! (\d+)></span>
|
||
<span class="go">[PASS] found <Test sleep OK63518!></span>
|
||
<span class="go">[PASS] found <current time_msec = (\d+)></span>
|
||
<span class="go">[PASS] found <time_msec = (\d+) after sleeping (\d+) ticks, delta = (\d+)ms!></span>
|
||
<span class="go">[PASS] found <Test sleep1 passed63518!></span>
|
||
<span class="go">[PASS] found <Test write A OK63518!></span>
|
||
<span class="go">[PASS] found <Test write B OK63518!></span>
|
||
<span class="go">[PASS] found <Test write C OK63518!></span>
|
||
<span class="go">[PASS] found <string from task info test></span>
|
||
<span class="go">[PASS] found <Test task info OK63518!></span>
|
||
<span class="go">[PASS] not found <FAIL: T.T></span>
|
||
|
||
<span class="go">Test passed63518: 15/15</span>
|
||
<span class="go">Report for lab1 found.</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<ul>
|
||
<li><p>提交你的修改</p>
|
||
<blockquote>
|
||
<div><ul class="simple">
|
||
<li><p>如果是基于GitHub Classroom 开发, 在本地环境或在线codespaces环境下，执行 <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">push</span></code> 命令，提交修改的代码到gitub进行CI自动评测。如果评测结果是 红色小叉 （位于repo的中上位置），可进一步点击红色小叉查找具体出错时的CI执行情况。</p></li>
|
||
</ul>
|
||
</div></blockquote>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="id3">
|
||
<h2>简答作业<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
|
||
<ol class="arabic">
|
||
<li><p>正确进入 U 态后，程序的特征还应有：使用 S 态特权指令，访问 S 态寄存器后会报错。
|
||
请同学们可以自行测试这些内容 (运行 <a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/tree/main/user/src/bin">Rust 三个 bad 测例 (ch2b_bad_*.rs)</a> ，
|
||
注意在编译时至少需要指定 <code class="docutils literal notranslate"><span class="pre">LOG=ERROR</span></code> 才能观察到内核的报错信息) ，
|
||
描述程序出错行为，同时注意注明你使用的 sbi 及其版本。</p></li>
|
||
<li><p>深入理解 <a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/blob/main/os3-ref/src/trap/trap.S">trap.S</a>
|
||
中两个函数 <code class="docutils literal notranslate"><span class="pre">__alltraps</span></code> 和 <code class="docutils literal notranslate"><span class="pre">__restore</span></code> 的作用，并回答如下问题:</p>
|
||
<ol class="arabic">
|
||
<li><p>L40：刚进入 <code class="docutils literal notranslate"><span class="pre">__restore</span></code> 时，<code class="docutils literal notranslate"><span class="pre">a0</span></code> 代表了什么值。请指出 <code class="docutils literal notranslate"><span class="pre">__restore</span></code> 的两种使用情景。</p></li>
|
||
<li><p>L46-L51：这几行汇编代码特殊处理了哪些寄存器？这些寄存器的的值对于进入用户态有何意义？请分别解释。</p>
|
||
<div class="highlight-riscv notranslate"><div class="highlight"><pre><span></span><span class="nd">ld</span><span class="w"> </span><span class="na">t0</span>,<span class="w"> </span><span class="m">32</span>*<span class="m">8</span>(<span class="na">sp</span>)<span class="w"></span>
|
||
<span class="nd">ld</span><span class="w"> </span><span class="na">t1</span>,<span class="w"> </span><span class="m">33</span>*<span class="m">8</span>(<span class="na">sp</span>)<span class="w"></span>
|
||
<span class="nd">ld</span><span class="w"> </span><span class="na">t2</span>,<span class="w"> </span><span class="m">2</span>*<span class="m">8</span>(<span class="na">sp</span>)<span class="w"></span>
|
||
<span class="nd">csrw</span><span class="w"> </span><span class="no">sstatus</span>,<span class="w"> </span><span class="na">t0</span><span class="w"></span>
|
||
<span class="nd">csrw</span><span class="w"> </span><span class="no">sepc</span>,<span class="w"> </span><span class="na">t1</span><span class="w"></span>
|
||
<span class="nd">csrw</span><span class="w"> </span><span class="no">sscratch</span>,<span class="w"> </span><span class="na">t2</span><span class="w"></span>
|
||
</pre></div>
|
||
</div>
|
||
</li>
|
||
<li><p>L53-L59：为何跳过了 <code class="docutils literal notranslate"><span class="pre">x2</span></code> 和 <code class="docutils literal notranslate"><span class="pre">x4</span></code>？</p>
|
||
<div class="highlight-riscv notranslate"><div class="highlight"><pre><span></span><span class="nd">ld</span><span class="w"> </span><span class="na">x1</span>,<span class="w"> </span><span class="m">1</span>*<span class="m">8</span>(<span class="na">sp</span>)<span class="w"></span>
|
||
<span class="nd">ld</span><span class="w"> </span><span class="na">x3</span>,<span class="w"> </span><span class="m">3</span>*<span class="m">8</span>(<span class="na">sp</span>)<span class="w"></span>
|
||
<span class="nf">.set</span><span class="w"> </span><span class="ni">n</span>,<span class="w"> </span><span class="m">5</span><span class="w"></span>
|
||
<span class="nf">.rept</span><span class="w"> </span><span class="m">27</span><span class="w"></span>
|
||
<span class="w"> </span><span class="nb">LOAD_GP</span><span class="w"> </span>%<span class="ni">n</span><span class="w"></span>
|
||
<span class="w"> </span><span class="nf">.set</span><span class="w"> </span><span class="ni">n</span>,<span class="w"> </span><span class="ni">n</span>+<span class="m">1</span><span class="w"></span>
|
||
<span class="nf">.endr</span><span class="w"></span>
|
||
</pre></div>
|
||
</div>
|
||
</li>
|
||
<li><p>L63：该指令之后，<code class="docutils literal notranslate"><span class="pre">sp</span></code> 和 <code class="docutils literal notranslate"><span class="pre">sscratch</span></code> 中的值分别有什么意义？</p>
|
||
<div class="highlight-riscv notranslate"><div class="highlight"><pre><span></span><span class="nd">csrrw</span><span class="w"> </span><span class="na">sp</span>,<span class="w"> </span><span class="no">sscratch</span>,<span class="w"> </span><span class="na">sp</span><span class="w"></span>
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</pre></div>
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</li>
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<li><p><code class="docutils literal notranslate"><span class="pre">__restore</span></code>：中发生状态切换在哪一条指令？为何该指令执行之后会进入用户态？</p></li>
|
||
<li><p>L13：该指令之后，<code class="docutils literal notranslate"><span class="pre">sp</span></code> 和 <code class="docutils literal notranslate"><span class="pre">sscratch</span></code> 中的值分别有什么意义？</p>
|
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<div class="highlight-riscv notranslate"><div class="highlight"><pre><span></span><span class="nd">csrrw</span><span class="w"> </span><span class="na">sp</span>,<span class="w"> </span><span class="no">sscratch</span>,<span class="w"> </span><span class="na">sp</span><span class="w"></span>
|
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</pre></div>
|
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|
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|
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<li><p>从 U 态进入 S 态是哪一条指令发生的？</p></li>
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<h2>报告要求<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
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