From 3d763374fe584903603ff814df59eb4acade4b6c Mon Sep 17 00:00:00 2001
From: wangrunji0408 <wangrunji0408@users.noreply.github.com>
Date: Mon, 27 Jul 2020 20:04:56 +0000
Subject: [PATCH] deploy: 87123f4801394669a0205218cc32345afeed1329

---
 ch01-01-kernel-object.html    |  48 ++++++++++++++++++++++++++++------
 img/ch01-01-kernel-object.png | Bin 0 -> 24499 bytes
 print.html                    |  48 ++++++++++++++++++++++++++++------
 searchindex.js                |   2 +-
 searchindex.json              |   2 +-
 5 files changed, 82 insertions(+), 18 deletions(-)
 create mode 100644 img/ch01-01-kernel-object.png

diff --git a/ch01-01-kernel-object.html b/ch01-01-kernel-object.html
index ad0b244..4894309 100644
--- a/ch01-01-kernel-object.html
+++ b/ch01-01-kernel-object.html
@@ -157,9 +157,40 @@
                     <main>
                         <h1><a class="header" href="#初识内核对象" id="初识内核对象">初识内核对象</a></h1>
 <h2><a class="header" href="#内核对象简介" id="内核对象简介">内核对象简介</a></h2>
-<p>TODO</p>
-<p>详细内容可参考 Fuchsia 官方文档：<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md">内核对象</a>。</p>
-<p>在这一节中我们将在 Rust 中实现内核对象的概念。</p>
+<p>在动手编写我们的代码之前，需要首先进行调研和学习，对目标对象有一个全面系统的了解。
+而了解一个项目设计的最好方式就是阅读官方提供的手册和文档。</p>
+<p>让我们先来阅读一下 Fuchsia 官方文档：<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md">内核对象</a>。这个链接是社区翻译的中文版，已经有些年头了。如果读者能够科学上网，推荐直接阅读<a href="https://fuchsia.dev/fuchsia-src/reference/kernel_objects/objects">官方英文版</a>。</p>
+<p>通过阅读文档，我们了解到与内核对象相关的三个重要概念：<strong>对象（Object），句柄（Handle），权限（Rights）</strong>。它们在 Zircon 内核中的角色和关系如下图所示：</p>
+<p><img src="img/ch01-01-kernel-object.png" alt="" /></p>
+<p>简单来说：</p>
+<ul>
+<li>Zircon是一个基于对象的内核，内核资源被抽象封装在不同的 <strong>对象</strong> 中。</li>
+<li>用户程序通过 <strong>句柄</strong> 与内核交互。句柄是对某一对象的引用，并且附加了特定的 <strong>权限</strong>。</li>
+<li>对象通过 <strong>引用计数</strong> 管理生命周期。当最后一个句柄关闭时，对象随之销毁。</li>
+</ul>
+<p>此外在内核对象的文档中，还列举了一些<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md#%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E5%8F%AF%E7%94%A8%E7%9A%84%E5%86%85%E6%A0%B8%E5%AF%B9%E8%B1%A1">常用对象</a>。点击链接进去就能查看到这个对象的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects/channel.md">具体描述</a>，在页面最下方还列举了与这个对象相关的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects/channel.md#%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8">全部系统调用</a>。
+进一步查看系统调用的 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_read.md#%E6%A6%82%E8%A6%81">API 定义</a>，以及它的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_read.md#%E6%8F%8F%E8%BF%B0">行为描述</a>，我们就能更深入地了解用户程序操作内核对象的一些细节：</p>
+<ul>
+<li>
+<p>创建：每一种内核对象都存在一个系统调用来创建它，例如 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_create.md"><code>zx_channel_create</code></a>。
+创建对象时一般需要传入一个参数选项 <code>options</code>，若创建成功则内核会将一个新句柄写入用户指定的内存中。</p>
+</li>
+<li>
+<p>使用：获得对象句柄后可以通过若干系统调用对它进行操作，例如 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_write.md"><code>zx_channel_write</code></a>。
+这类系统调用一般需要传入句柄 <code>handle</code> 作为第一个参数，内核首先对其进行检查，如果句柄非法或者对象类型与系统调用不匹配就会报错。
+接下来内核会检查句柄的权限是否满足操作的要求，例如 <code>write</code> 操作一般要求句柄具有 <code>WRITE</code> 权限，如果权限不满足就会继续报错。</p>
+</li>
+<li>
+<p>关闭：当用户程序不再使用对象时，会调用 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/handle_close.md"><code>zx_handle_close</code></a> 关闭句柄。当用户进程退出时，仍处于打开状态的句柄也都会自动关闭。</p>
+</li>
+</ul>
+<p>我们还发现，有一类 Object 系统调用是对所有内核对象都适用的。
+这表明所有内核对象都有一些公共属性，例如 ID、名称等等。每一种内核对象也会有自己特有的属性。</p>
+<p>其中一些 Object 系统调用和信号相关。Zircon 每个内核对象都附带有 32 个 <strong><a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/signals.md">信号（Signals）</a></strong>，它们代表了不同类型的事件。
+与传统 Unix 系统的信号不同，它不能异步地打断用户程序运行，而只能由用户程序主动地阻塞等待在某个对象的某些信号上面。
+信号是 Zircon 内核中很重要的机制，不过这部分在前期不会涉及，我们留到第五章再具体实现。</p>
+<p>以上我们了解了 Zircon 内核对象的相关概念和使用方式。接下来在这一节中，我们将用 Rust 实现内核对象的基本框架，以方便后续快速实现各种具体类型的内核对象。
+从传统面向对象语言的视角看，我们只是在实现一个基类。但由于 Rust 语言模型的限制，这件事情需要用到一些特殊的技巧。</p>
 <h2><a class="header" href="#建立项目" id="建立项目">建立项目</a></h2>
 <p>首先我们需要安装 Rust 工具链。在 Linux 或 macOS 系统下，只需要用一个命令下载安装 rustup 即可：</p>
 <pre><code class="language-sh">$ curl https://sh.rustup.rs -sSf | sh
@@ -323,10 +354,11 @@ DummyObject *dummy = dynamic_cast&lt;DummyObject*&gt;(base);
 <p>但在 Rust 中，由于其 trait 模型的限制，向下转换并不是一件容易的事情。
 虽然标准库中提供了 <a href="https://doc.rust-lang.org/std/any/"><code>Any</code></a> trait，部分实现了动态类型的功能，但实际操作起来却困难重重。
 不信邪的同学可以自己折腾一下：</p>
-<pre><code class="language-rust editable noplaypen"><span class="boring">use core::any::Any;
-</span><span class="boring">use alloc::sync::Arc;
-</span><span class="boring">
-</span>trait KernelObject: Any + Send + Sync {}
+<pre><pre class="playground"><code class="language-rust editable"><span class="boring">use std::any::Any;
+</span><span class="boring">use std::sync::Arc;
+</span><span class="boring">fn main() {}
+</span>
+trait KernelObject: Any + Send + Sync {}
 fn downcast_v1&lt;T: KernelObject&gt;(object: Arc&lt;dyn KernelObject&gt;) -&gt; Arc&lt;T&gt; {
     object.downcast::&lt;T&gt;().unwrap()
 }
@@ -334,7 +366,7 @@ fn downcast_v2&lt;T: KernelObject&gt;(object: Arc&lt;dyn KernelObject&gt;) -&gt;
     let object: Arc&lt;dyn Any + Send + Sync + 'static&gt; = object;
     object.downcast::&lt;T&gt;().unwrap()
 }
-</code></pre>
+</code></pre></pre>
 <p>当然这个问题也困扰了 Rust 社区中的很多人。目前已经有人提出了一套不错的解决方案，就是我们接下来要引入的 <a href="https://docs.rs/downcast-rs/1.2.0/downcast_rs/index.html"><code>downcast-rs</code></a> 库：</p>
 <pre><code class="language-toml">[dependencies]
 downcast-rs = { version = &quot;1.2.0&quot;, default-features = false }
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diff --git a/print.html b/print.html
index b6b7da0..8b56296 100644
--- a/print.html
+++ b/print.html
@@ -176,9 +176,40 @@
 最后会实现一个稍微复杂但是极其重要的对象 <code>Channel</code>，它是进程间通信（<em>IPC</em>）的基础设施，也是传送对象的唯一管道。</p>
 <h1><a class="header" href="#初识内核对象" id="初识内核对象">初识内核对象</a></h1>
 <h2><a class="header" href="#内核对象简介" id="内核对象简介">内核对象简介</a></h2>
-<p>TODO</p>
-<p>详细内容可参考 Fuchsia 官方文档：<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md">内核对象</a>。</p>
-<p>在这一节中我们将在 Rust 中实现内核对象的概念。</p>
+<p>在动手编写我们的代码之前，需要首先进行调研和学习，对目标对象有一个全面系统的了解。
+而了解一个项目设计的最好方式就是阅读官方提供的手册和文档。</p>
+<p>让我们先来阅读一下 Fuchsia 官方文档：<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md">内核对象</a>。这个链接是社区翻译的中文版，已经有些年头了。如果读者能够科学上网，推荐直接阅读<a href="https://fuchsia.dev/fuchsia-src/reference/kernel_objects/objects">官方英文版</a>。</p>
+<p>通过阅读文档，我们了解到与内核对象相关的三个重要概念：<strong>对象（Object），句柄（Handle），权限（Rights）</strong>。它们在 Zircon 内核中的角色和关系如下图所示：</p>
+<p><img src="img/ch01-01-kernel-object.png" alt="" /></p>
+<p>简单来说：</p>
+<ul>
+<li>Zircon是一个基于对象的内核，内核资源被抽象封装在不同的 <strong>对象</strong> 中。</li>
+<li>用户程序通过 <strong>句柄</strong> 与内核交互。句柄是对某一对象的引用，并且附加了特定的 <strong>权限</strong>。</li>
+<li>对象通过 <strong>引用计数</strong> 管理生命周期。当最后一个句柄关闭时，对象随之销毁。</li>
+</ul>
+<p>此外在内核对象的文档中，还列举了一些<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects.md#%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E5%8F%AF%E7%94%A8%E7%9A%84%E5%86%85%E6%A0%B8%E5%AF%B9%E8%B1%A1">常用对象</a>。点击链接进去就能查看到这个对象的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects/channel.md">具体描述</a>，在页面最下方还列举了与这个对象相关的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/objects/channel.md#%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8">全部系统调用</a>。
+进一步查看系统调用的 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_read.md#%E6%A6%82%E8%A6%81">API 定义</a>，以及它的<a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_read.md#%E6%8F%8F%E8%BF%B0">行为描述</a>，我们就能更深入地了解用户程序操作内核对象的一些细节：</p>
+<ul>
+<li>
+<p>创建：每一种内核对象都存在一个系统调用来创建它，例如 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_create.md"><code>zx_channel_create</code></a>。
+创建对象时一般需要传入一个参数选项 <code>options</code>，若创建成功则内核会将一个新句柄写入用户指定的内存中。</p>
+</li>
+<li>
+<p>使用：获得对象句柄后可以通过若干系统调用对它进行操作，例如 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/channel_write.md"><code>zx_channel_write</code></a>。
+这类系统调用一般需要传入句柄 <code>handle</code> 作为第一个参数，内核首先对其进行检查，如果句柄非法或者对象类型与系统调用不匹配就会报错。
+接下来内核会检查句柄的权限是否满足操作的要求，例如 <code>write</code> 操作一般要求句柄具有 <code>WRITE</code> 权限，如果权限不满足就会继续报错。</p>
+</li>
+<li>
+<p>关闭：当用户程序不再使用对象时，会调用 <a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/syscalls/handle_close.md"><code>zx_handle_close</code></a> 关闭句柄。当用户进程退出时，仍处于打开状态的句柄也都会自动关闭。</p>
+</li>
+</ul>
+<p>我们还发现，有一类 Object 系统调用是对所有内核对象都适用的。
+这表明所有内核对象都有一些公共属性，例如 ID、名称等等。每一种内核对象也会有自己特有的属性。</p>
+<p>其中一些 Object 系统调用和信号相关。Zircon 每个内核对象都附带有 32 个 <strong><a href="https://github.com/zhangpf/fuchsia-docs-zh-CN/blob/master/zircon/docs/signals.md">信号（Signals）</a></strong>，它们代表了不同类型的事件。
+与传统 Unix 系统的信号不同，它不能异步地打断用户程序运行，而只能由用户程序主动地阻塞等待在某个对象的某些信号上面。
+信号是 Zircon 内核中很重要的机制，不过这部分在前期不会涉及，我们留到第五章再具体实现。</p>
+<p>以上我们了解了 Zircon 内核对象的相关概念和使用方式。接下来在这一节中，我们将用 Rust 实现内核对象的基本框架，以方便后续快速实现各种具体类型的内核对象。
+从传统面向对象语言的视角看，我们只是在实现一个基类。但由于 Rust 语言模型的限制，这件事情需要用到一些特殊的技巧。</p>
 <h2><a class="header" href="#建立项目" id="建立项目">建立项目</a></h2>
 <p>首先我们需要安装 Rust 工具链。在 Linux 或 macOS 系统下，只需要用一个命令下载安装 rustup 即可：</p>
 <pre><code class="language-sh">$ curl https://sh.rustup.rs -sSf | sh
@@ -342,10 +373,11 @@ DummyObject *dummy = dynamic_cast&lt;DummyObject*&gt;(base);
 <p>但在 Rust 中，由于其 trait 模型的限制，向下转换并不是一件容易的事情。
 虽然标准库中提供了 <a href="https://doc.rust-lang.org/std/any/"><code>Any</code></a> trait，部分实现了动态类型的功能，但实际操作起来却困难重重。
 不信邪的同学可以自己折腾一下：</p>
-<pre><code class="language-rust editable noplaypen"><span class="boring">use core::any::Any;
-</span><span class="boring">use alloc::sync::Arc;
-</span><span class="boring">
-</span>trait KernelObject: Any + Send + Sync {}
+<pre><pre class="playground"><code class="language-rust editable"><span class="boring">use std::any::Any;
+</span><span class="boring">use std::sync::Arc;
+</span><span class="boring">fn main() {}
+</span>
+trait KernelObject: Any + Send + Sync {}
 fn downcast_v1&lt;T: KernelObject&gt;(object: Arc&lt;dyn KernelObject&gt;) -&gt; Arc&lt;T&gt; {
     object.downcast::&lt;T&gt;().unwrap()
 }
@@ -353,7 +385,7 @@ fn downcast_v2&lt;T: KernelObject&gt;(object: Arc&lt;dyn KernelObject&gt;) -&gt;
     let object: Arc&lt;dyn Any + Send + Sync + 'static&gt; = object;
     object.downcast::&lt;T&gt;().unwrap()
 }
-</code></pre>
+</code></pre></pre>
 <p>当然这个问题也困扰了 Rust 社区中的很多人。目前已经有人提出了一套不错的解决方案，就是我们接下来要引入的 <a href="https://docs.rs/downcast-rs/1.2.0/downcast_rs/index.html"><code>downcast-rs</code></a> 库：</p>
 <pre><code class="language-toml">[dependencies]
 downcast-rs = { version = &quot;1.2.0&quot;, default-features = false }
diff --git a/searchindex.js b/searchindex.js
index 8b7f385..9a72b6a 100644
--- a/searchindex.js
+++ b/searchindex.js
@@ -1 +1 @@
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zCore 教程","id":"0","title":"简明 zCore 教程"},"1":{"body":"zCore 是用 Rust 语言重写的 Zircon 微内核，它是 Google 正在开发的 Fuchsia OS 中的底层内核。 本教程基于 zCore 的真实开发历史，还原其开发过程。带领读者一步一步用 Rust 实现自己的 Zircon 内核，最终能够运行原生的 shell 程序。 在此过程中我们将体会 Zircon 微内核的设计理念，感受如何用 Rust 语言以一种现代的方式编写系统软件，在项目中实现理论与实践的融合。 与传统操作系统开发不同的是，zCore 使用一种自顶向下的方法：首先基于宿主系统已有的功能，在用户态实现一个能够工作的 libOS，然后再逐步替换底层实现， \"移植\"回裸机环境中运行。因此我们更关注系统的整体设计，从高层视角看待 OS 如何为用户提供服务，而不纠结于底层硬件细节。 鉴于此，本教程假设读者了解操作系统基本概念和原理，具有常用的 Linux 系统使用经验，并且会使用 Rust 语言编写简单程序。 如果读者不熟悉操作系统和 Rust 语言，希望以自底向上方法从零构建操作系统， rCore Tutorial 可能是更好的选择。 如果你准备好了，让我们开始吧！","breadcrumbs":"自己动手山寨操作系统：自顶向下方法","id":"1","title":"自己动手山寨操作系统：自顶向下方法"},"10":{"body":"在系统调用中，用户进程会传入一个内核对象的句柄，然后内核会根据系统调用的类型，尝试将其转换成特定类型的对象。 于是这里产生了一个很重要的需求：将接口 Arc<dyn KernelObject> 转换成具体类型的结构 Arc<T> where T: KernelObject。 这种操作在面向对象语言中称为 向下转换（downcast） 。 在大部分编程语言中，向下转换都是一件非常轻松的事情。例如在 C/C++ 中，我们可以这样写： struct KernelObject {...};\nstruct DummyObject: KernelObject {...}; KernelObject *base = ...;\n// C 风格：强制类型转换\nDummyObject *dummy = (DummyObject*)(base);\n// C++ 风格：动态类型转换\nDummyObject *dummy = dynamic_cast<DummyObject*>(base); 但在 Rust 中，由于其 trait 模型的限制，向下转换并不是一件容易的事情。 虽然标准库中提供了 Any trait，部分实现了动态类型的功能，但实际操作起来却困难重重。 不信邪的同学可以自己折腾一下： # use std::any::Any;\n# use std::sync::Arc;\n# fn main() {} trait KernelObject: Any + Send + Sync {}\nfn downcast_v1<T: KernelObject>(object: Arc<dyn KernelObject>) -> Arc<T> { object.downcast::<T>().unwrap()\n}\nfn downcast_v2<T: KernelObject>(object: Arc<dyn KernelObject>) -> Arc<T> { let object: Arc<dyn Any + Send + Sync + 'static> = object; object.downcast::<T>().unwrap()\n} 当然这个问题也困扰了 Rust 社区中的很多人。目前已经有人提出了一套不错的解决方案，就是我们接下来要引入的 downcast-rs 库： [dependencies]\ndowncast-rs = { version = \"1.2.0\", default-features = false } （题外话：这个库原来是不支持 no_std 的，zCore 有这个需求，于是就顺便帮他实现了一把） 按照它文档的描述，我们要为自己的接口实现向下转换，只需以下修改： // src/object/mod.rs\nuse core::fmt::Debug;\nuse downcast_rs::{impl_downcast, DowncastSync}; pub trait KernelObject: DowncastSync + Debug {...}\nimpl_downcast!(sync KernelObject); 其中 DowncastSync 代替了原来的 Send + Sync，Debug 用于出错时输出调试信息。 impl_downcast! 宏用来帮我们自动生成转换函数，然后就可以用 downcast_arc 来对 Arc 做向下转换了。我们直接来测试一把： // src/object/object.rs\n#[test]\nfn downcast() { let dummy = DummyObject::new(); let object: Arc<dyn KernelObject> = dummy; let _result: Arc<DummyObject> = object.downcast_arc::<DummyObject>().unwrap();\n} $ cargo test Finished test [unoptimized + debuginfo] target(s) in 0.47s Running target/debug/deps/zcore-ae1be84852989b13 running 2 tests\ntest object::downcast ... ok\ntest object::tests::dummy_object ... ok","breadcrumbs":"内核对象 » 实现接口到具体类型的向下转换","id":"10","title":"实现接口到具体类型的向下转换"},"11":{"body":"上面我们已经完整实现了一个内核对象，代码看起来很简洁。但当我们要实现更多对象的时候，就会发现一个问题： 这些对象拥有一些公共属性，接口方法也有共同的实现。 在传统 OOP 语言中，我们通常使用 继承（inheritance） 来复用这些公共代码：子类 B 可以继承父类 A，然后自动拥有父类的所有字段和方法。 继承是一个很强大的功能，但在长期实践中人们也逐渐发现了它的弊端。有兴趣的读者可以看一看知乎上的探讨： 面向对象编程的弊端是什么？ 。 经典著作《设计模式》中就鼓励大家 使用组合代替继承 。而一些现代的编程语言，如 Go 和 Rust，甚至直接抛弃了继承。在 Rust 中，通常使用组合结构和 Deref trait 来部分模拟继承。 继承野蛮，trait 文明。 —— 某 Rust 爱好者 接下来我们模仿 downcast-rs 库的做法，使用一种基于宏的代码生成方案，来实现 KernelObject 的继承。 当然这只是抛砖引玉，如果读者自己实现了，或者了解到社区中有更好的解决方案，也欢迎指出。 具体做法是这样的： 使用一个 struct 来提供所有的公共属性和方法，作为所有子类的第一个成员。 为子类实现 trait 接口，所有方法直接委托给内部 struct 完成。这部分使用宏来自动生成模板代码。 而所谓的内部 struct，其实就是我们上面实现的 DummyObject。为了更好地体现它的功能，我们给他改个名叫 KObjectBase： // src/object/mod.rs\n/// 内核对象核心结构\npub struct KObjectBase { /// 对象 ID pub id: KoID, inner: Mutex<KObjectBaseInner>,\n} /// `KObjectBase` 的内部可变部分\n#[derive(Default)]\nstruct KObjectBaseInner { name: String,\n} 接下来我们把它的构造函数改为实现 Default trait，并且公共属性和方法都指定为 pub： // src/object/mod.rs\nimpl Default for KObjectBase { /// 创建一个新 `KObjectBase` fn default() -> Self { KObjectBase { id: Self::new_koid(), inner: Default::default(), } }\n}\nimpl KObjectBase { /// 生成一个唯一的 ID fn new_koid() -> KoID {...} /// 获取对象名称 pub fn name(&self) -> String {...} /// 设置对象名称 pub fn set_name(&self, name: &str) {...}\n} 最后来写一个魔法的宏！ // src/object/mod.rs\n/// 为内核对象 struct 自动实现 `KernelObject` trait 的宏。\n#[macro_export] // 导出宏，可在 crate 外部使用\nmacro_rules! impl_kobject { // 匹配类型名，并可以提供函数覆盖默认实现 ($class:ident $( $fn:tt )*) => { // 为对象实现 KernelObject trait，方法直接转发到内部 struct impl KernelObject for $class { fn id(&self) -> KoID { // 直接访问内部的 pub 属性 self.base.id } fn type_name(&self) -> &str { // 用 stringify! 宏将输入转成字符串 stringify!($class) } // 注意宏里面的类型要写完整路径，例如：alloc::string::String fn name(&self) -> alloc::string::String { self.base.name() } fn set_name(&self, name: &str){ // 直接访问内部的 pub 方法 self.base.set_name(name) } // 可以传入任意数量的函数，覆盖 trait 的默认实现 $( $fn )* } // 为对象实现 Debug trait impl core::fmt::Debug for $class { fn fmt( &self, f: &mut core::fmt::Formatter<'_>, ) -> core::result::Result<(), core::fmt::Error> { // 输出对象类型、ID 和名称 f.debug_tuple(&stringify!($class)) .field(&self.id()) .field(&self.name()) .finish() } } };\n} 轮子已经造好了！让我们看看如何用它方便地实现一个内核对象，仍以 DummyObject 为例： // src/object/mod.rs\n/// 空对象\npub struct DummyObject { // 其中必须包含一个名为 `base` 的 `KObjectBase` base: KObjectBase,\n} // 使用刚才的宏，声明其为内核对象，自动生成必要的代码\nimpl_kobject!(DummyObject); impl DummyObject { /// 创建一个新 `DummyObject` pub fn new() -> Arc<Self> { Arc::new(DummyObject { base: KObjectBase::default(), }) }\n} 是不是方便了很多？最后按照惯例，用单元测试检验实现的正确性： // src/object/mod.rs\n#[test]\nfn impl_kobject() { use alloc::format; let dummy = DummyObject::new(); let object: Arc<dyn KernelObject> = dummy; assert_eq!(object.type_name(), \"DummyObject\"); assert_eq!(object.name(), \"\"); object.set_name(\"dummy\"); assert_eq!(object.name(), \"dummy\"); assert_eq!( format!(\"{:?}\", object), format!(\"DummyObject({}, \\\"dummy\\\")\", object.id()) ); let _result: Arc<DummyObject> = object.downcast_arc::<DummyObject>().unwrap();\n} 有兴趣的读者可以继续探索使用功能更强大的 过程宏（proc_macro） ，进一步简化实现新内核对象所需的模板代码。 如果能把上面的代码块缩小成下面这两行，就更加完美了： #[KernelObject]\npub struct DummyObject;","breadcrumbs":"内核对象 » 模拟继承：用宏自动生成接口实现代码","id":"11","title":"模拟继承：用宏自动生成接口实现代码"},"12":{"body":"在这一节中我们用 Rust 语言实现了 Zircon 最核心的 内核对象 概念。在此过程中涉及到 Rust 的一系列语言特性和设计模式： 使用 trait 实现接口 使用 内部可变性 模式实现并发对象 基于社区解决方案实现 trait 到 struct 的 向下转换 使用组合模拟继承，并使用 宏 实现模板代码的自动生成 由于 Rust 独特的 面向对象编程特性 ，我们在实现内核对象的过程中遇到了一定的挑战。 不过万事开头难，解决这些问题为整个项目打下了坚实基础，后面实现新的内核对象就会变得简单很多。 在下一节中，我们将介绍内核对象相关的另外两个概念：句柄和权限，并实现内核对象的存储和访问。","breadcrumbs":"内核对象 » 总结","id":"12","title":"总结"},"13":{"body":"","breadcrumbs":"内核对象 » 对象管理器：Process 对象","id":"13","title":"对象管理器：Process 对象"},"14":{"body":"","breadcrumbs":"内核对象 » 句柄和权限","id":"14","title":"句柄和权限"},"15":{"body":"","breadcrumbs":"内核对象 » 实现第一个内核对象","id":"15","title":"实现第一个内核对象"},"16":{"body":"","breadcrumbs":"内核对象 » 存储内核对象句柄","id":"16","title":"存储内核对象句柄"},"17":{"body":"","breadcrumbs":"内核对象 » 根据句柄查找内核对象","id":"17","title":"根据句柄查找内核对象"},"18":{"body":"","breadcrumbs":"内核对象 » 对象传送器：Channel 对象","id":"18","title":"对象传送器：Channel 对象"},"19":{"body":"","breadcrumbs":"内核对象 » 创建一对内核对象","id":"19","title":"创建一对内核对象"},"2":{"body":"","breadcrumbs":"zCore 整体结构和设计模式","id":"2","title":"zCore 整体结构和设计模式"},"20":{"body":"","breadcrumbs":"内核对象 » 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，在页面最下方还列举了与这个对象相关的 全部系统调用 。 进一步查看系统调用的 API 定义 ，以及它的 行为描述 ，我们就能更深入地了解用户程序操作内核对象的一些细节： 创建：每一种内核对象都存在一个系统调用来创建它，例如 zx_channel_create 。 创建对象时一般需要传入一个参数选项 options，若创建成功则内核会将一个新句柄写入用户指定的内存中。 使用：获得对象句柄后可以通过若干系统调用对它进行操作，例如 zx_channel_write 。 这类系统调用一般需要传入句柄 handle 作为第一个参数，内核首先对其进行检查，如果句柄非法或者对象类型与系统调用不匹配就会报错。 接下来内核会检查句柄的权限是否满足操作的要求，例如 write 操作一般要求句柄具有 WRITE 权限，如果权限不满足就会继续报错。 关闭：当用户程序不再使用对象时，会调用 zx_handle_close 关闭句柄。当用户进程退出时，仍处于打开状态的句柄也都会自动关闭。 我们还发现，有一类 Object 系统调用是对所有内核对象都适用的。 这表明所有内核对象都有一些公共属性，例如 ID、名称等等。每一种内核对象也会有自己特有的属性。 其中一些 Object 系统调用和信号相关。Zircon 每个内核对象都附带有 32 个 信号（Signals） ，它们代表了不同类型的事件。 与传统 Unix 系统的信号不同，它不能异步地打断用户程序运行，而只能由用户程序主动地阻塞等待在某个对象的某些信号上面。 信号是 Zircon 内核中很重要的机制，不过这部分在前期不会涉及，我们留到第五章再具体实现。 以上我们了解了 Zircon 内核对象的相关概念和使用方式。接下来在这一节中，我们将用 Rust 实现内核对象的基本框架，以方便后续快速实现各种具体类型的内核对象。 从传统面向对象语言的视角看，我们只是在实现一个基类。但由于 Rust 语言模型的限制，这件事情需要用到一些特殊的技巧。","breadcrumbs":"内核对象 » 内核对象简介","id":"6","title":"内核对象简介"},"7":{"body":"首先我们需要安装 Rust 工具链。在 Linux 或 macOS 系统下，只需要用一个命令下载安装 rustup 即可： $ curl 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src/object/mod.rs\n/// 内核对象公共接口\npub trait KernelObject: Send + Sync { /// 获取对象 ID fn id(&self) -> KoID; /// 获取对象类型名 fn type_name(&self) -> &str; /// 获取对象名称 fn name(&self) -> String; /// 设置对象名称 fn set_name(&self, name: &str);\n} /// 对象 ID 类型\npub type KoID = u64; 这里的 Send + Sync 是一个约束所有 KernelObject 都要满足的前提条件，即它必须是一个 并发对象 。 所谓并发对象指的是 可以安全地被多线程共享访问 。事实上我们的内核本身就是一个共享地址空间的多线程程序，在裸机上每个 CPU 核都可以被视为一个并发执行的线程。 由于内核对象可能被多个线程同时访问，因此它必须是并发对象。","breadcrumbs":"内核对象 » 实现 KernelObject 接口","id":"8","title":"实现 KernelObject 接口"},"9":{"body":"接下来我们实现一个最简单的空对象 DummyObject，并为它实现 KernelObject 接口： // src/object/object.rs\nuse spin::Mutex; /// 空对象\n#[derive(Debug)]\npub struct DummyObject { id: KoID, inner: Mutex<DummyObjectInner>,\n} /// `DummyObject` 的内部可变部分\n#[derive(Default, Debug)]\nstruct DummyObjectInner { name: String,\n} 这里我们采用一种 内部可变性 的设计模式：将对象的所有可变的部分封装到一个内部对象 DummyObjectInner 中，并在原对象中用自旋锁 Mutex 把它包起来，剩下的其它字段都是不可变的。 Mutex 会用最简单的方式帮我们处理好并发访问问题：如果有其他人正在访问，我就在这里死等。 数据被 Mutex 包起来之后需要首先使用 lock() 拿到锁之后才能访问。此时并发访问已经安全，因此被包起来的结构自动具有了 Send + Sync 特性。 使用自旋锁引入了新的依赖库 spin ，需要在 Cargo.toml 中加入以下声明： [dependencies]\nspin = \"0.5\" 然后我们为新对象实现构造函数： // src/object/object.rs\nuse alloc::sync::Arc;\nuse core::sync::atomic::*; impl DummyObject { /// 创建一个新 `DummyObject` pub fn new() -> Arc<Self> { Arc::new(DummyObject { id: Self::new_koid(), inner: Default::default(), }) } /// 生成一个唯一的 ID fn new_koid() -> KoID { static NEXT_KOID: AtomicU64 = AtomicU64::new(1024); NEXT_KOID.fetch_add(1, Ordering::SeqCst) }\n} 根据文档描述，每个内核对象都有唯一的 ID。为此我们需要实现一个全局的 ID 分配方法。这里采用的方法是用一个静态变量存放下一个待分配 ID 值，每次分配就原子地 +1。 ID 类型使用 u64，保证了数值空间足够大，在有生之年都不用担心溢出问题。在 Zircon 中 ID 从 1024 开始分配，1024 以下保留作内核内部使用。 另外注意这里 new 函数返回类型不是 Self 而是 Arc<Self>，这是为了以后方便而做的统一约定。 最后我们为它实现 KernelObject 接口： // src/object/object.rs\nimpl KernelObject for DummyObject { fn id(&self) -> KoID { self.id } fn type_name(&self) -> &str { \"DummyObject\" } fn name(&self) -> String { self.inner.lock().name.clone() } fn set_name(&self, name: &str) { 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zCore 教程","id":"0","title":"简明 zCore 教程"},"1":{"body":"zCore 是用 Rust 语言重写的 Zircon 微内核，它是 Google 正在开发的 Fuchsia OS 中的底层内核。 本教程基于 zCore 的真实开发历史，还原其开发过程。带领读者一步一步用 Rust 实现自己的 Zircon 内核，最终能够运行原生的 shell 程序。 在此过程中我们将体会 Zircon 微内核的设计理念，感受如何用 Rust 语言以一种现代的方式编写系统软件，在项目中实现理论与实践的融合。 与传统操作系统开发不同的是，zCore 使用一种自顶向下的方法：首先基于宿主系统已有的功能，在用户态实现一个能够工作的 libOS，然后再逐步替换底层实现， \"移植\"回裸机环境中运行。因此我们更关注系统的整体设计，从高层视角看待 OS 如何为用户提供服务，而不纠结于底层硬件细节。 鉴于此，本教程假设读者了解操作系统基本概念和原理，具有常用的 Linux 系统使用经验，并且会使用 Rust 语言编写简单程序。 如果读者不熟悉操作系统和 Rust 语言，希望以自底向上方法从零构建操作系统， rCore Tutorial 可能是更好的选择。 如果你准备好了，让我们开始吧！","breadcrumbs":"自己动手山寨操作系统：自顶向下方法","id":"1","title":"自己动手山寨操作系统：自顶向下方法"},"10":{"body":"在系统调用中，用户进程会传入一个内核对象的句柄，然后内核会根据系统调用的类型，尝试将其转换成特定类型的对象。 于是这里产生了一个很重要的需求：将接口 Arc<dyn KernelObject> 转换成具体类型的结构 Arc<T> where T: KernelObject。 这种操作在面向对象语言中称为 向下转换（downcast） 。 在大部分编程语言中，向下转换都是一件非常轻松的事情。例如在 C/C++ 中，我们可以这样写： struct KernelObject {...};\nstruct DummyObject: KernelObject {...}; KernelObject *base = ...;\n// C 风格：强制类型转换\nDummyObject *dummy = (DummyObject*)(base);\n// C++ 风格：动态类型转换\nDummyObject *dummy = dynamic_cast<DummyObject*>(base); 但在 Rust 中，由于其 trait 模型的限制，向下转换并不是一件容易的事情。 虽然标准库中提供了 Any trait，部分实现了动态类型的功能，但实际操作起来却困难重重。 不信邪的同学可以自己折腾一下： # use core::any::Any;\n# use alloc::sync::Arc;\n#\ntrait KernelObject: Any + Send + Sync {}\nfn downcast_v1<T: KernelObject>(object: Arc<dyn KernelObject>) -> Arc<T> { object.downcast::<T>().unwrap()\n}\nfn downcast_v2<T: KernelObject>(object: Arc<dyn KernelObject>) -> Arc<T> { let object: Arc<dyn Any + Send + Sync + 'static> = object; object.downcast::<T>().unwrap()\n} 当然这个问题也困扰了 Rust 社区中的很多人。目前已经有人提出了一套不错的解决方案，就是我们接下来要引入的 downcast-rs 库： [dependencies]\ndowncast-rs = { version = \"1.2.0\", default-features = false } （题外话：这个库原来是不支持 no_std 的，zCore 有这个需求，于是就顺便帮他实现了一把） 按照它文档的描述，我们要为自己的接口实现向下转换，只需以下修改： // src/object/mod.rs\nuse core::fmt::Debug;\nuse downcast_rs::{impl_downcast, DowncastSync}; pub trait KernelObject: DowncastSync + Debug {...}\nimpl_downcast!(sync KernelObject); 其中 DowncastSync 代替了原来的 Send + Sync，Debug 用于出错时输出调试信息。 impl_downcast! 宏用来帮我们自动生成转换函数，然后就可以用 downcast_arc 来对 Arc 做向下转换了。我们直接来测试一把： // src/object/object.rs\n#[test]\nfn downcast() { let dummy = DummyObject::new(); let object: Arc<dyn KernelObject> = dummy; let _result: Arc<DummyObject> = object.downcast_arc::<DummyObject>().unwrap();\n} $ cargo test Finished test [unoptimized + debuginfo] target(s) in 0.47s Running target/debug/deps/zcore-ae1be84852989b13 running 2 tests\ntest object::downcast ... ok\ntest object::tests::dummy_object ... ok","breadcrumbs":"内核对象 » 实现接口到具体类型的向下转换","id":"10","title":"实现接口到具体类型的向下转换"},"11":{"body":"上面我们已经完整实现了一个内核对象，代码看起来很简洁。但当我们要实现更多对象的时候，就会发现一个问题： 这些对象拥有一些公共属性，接口方法也有共同的实现。 在传统 OOP 语言中，我们通常使用 继承（inheritance） 来复用这些公共代码：子类 B 可以继承父类 A，然后自动拥有父类的所有字段和方法。 继承是一个很强大的功能，但在长期实践中人们也逐渐发现了它的弊端。有兴趣的读者可以看一看知乎上的探讨： 面向对象编程的弊端是什么？ 。 经典著作《设计模式》中就鼓励大家 使用组合代替继承 。而一些现代的编程语言，如 Go 和 Rust，甚至直接抛弃了继承。在 Rust 中，通常使用组合结构和 Deref trait 来部分模拟继承。 继承野蛮，trait 文明。 —— 某 Rust 爱好者 接下来我们模仿 downcast-rs 库的做法，使用一种基于宏的代码生成方案，来实现 KernelObject 的继承。 当然这只是抛砖引玉，如果读者自己实现了，或者了解到社区中有更好的解决方案，也欢迎指出。 具体做法是这样的： 使用一个 struct 来提供所有的公共属性和方法，作为所有子类的第一个成员。 为子类实现 trait 接口，所有方法直接委托给内部 struct 完成。这部分使用宏来自动生成模板代码。 而所谓的内部 struct，其实就是我们上面实现的 DummyObject。为了更好地体现它的功能，我们给他改个名叫 KObjectBase： // src/object/mod.rs\n/// 内核对象核心结构\npub struct KObjectBase { /// 对象 ID pub id: KoID, inner: Mutex<KObjectBaseInner>,\n} /// `KObjectBase` 的内部可变部分\n#[derive(Default)]\nstruct KObjectBaseInner { name: String,\n} 接下来我们把它的构造函数改为实现 Default trait，并且公共属性和方法都指定为 pub： // src/object/mod.rs\nimpl Default for KObjectBase { /// 创建一个新 `KObjectBase` fn default() -> Self { KObjectBase { id: Self::new_koid(), inner: Default::default(), } }\n}\nimpl KObjectBase { /// 生成一个唯一的 ID fn new_koid() -> KoID {...} /// 获取对象名称 pub fn name(&self) -> String {...} /// 设置对象名称 pub fn set_name(&self, name: &str) {...}\n} 最后来写一个魔法的宏！ // src/object/mod.rs\n/// 为内核对象 struct 自动实现 `KernelObject` trait 的宏。\n#[macro_export] // 导出宏，可在 crate 外部使用\nmacro_rules! impl_kobject { // 匹配类型名，并可以提供函数覆盖默认实现 ($class:ident $( $fn:tt )*) => { // 为对象实现 KernelObject trait，方法直接转发到内部 struct impl KernelObject for $class { fn id(&self) -> KoID { // 直接访问内部的 pub 属性 self.base.id } fn type_name(&self) -> &str { // 用 stringify! 宏将输入转成字符串 stringify!($class) } // 注意宏里面的类型要写完整路径，例如：alloc::string::String fn name(&self) -> alloc::string::String { self.base.name() } fn set_name(&self, name: &str){ // 直接访问内部的 pub 方法 self.base.set_name(name) } // 可以传入任意数量的函数，覆盖 trait 的默认实现 $( $fn )* } // 为对象实现 Debug trait impl core::fmt::Debug for $class { fn fmt( &self, f: &mut core::fmt::Formatter<'_>, ) -> core::result::Result<(), core::fmt::Error> { // 输出对象类型、ID 和名称 f.debug_tuple(&stringify!($class)) .field(&self.id()) .field(&self.name()) .finish() } } };\n} 轮子已经造好了！让我们看看如何用它方便地实现一个内核对象，仍以 DummyObject 为例： // src/object/mod.rs\n/// 空对象\npub struct DummyObject { // 其中必须包含一个名为 `base` 的 `KObjectBase` base: KObjectBase,\n} // 使用刚才的宏，声明其为内核对象，自动生成必要的代码\nimpl_kobject!(DummyObject); impl DummyObject { /// 创建一个新 `DummyObject` pub fn new() -> Arc<Self> { Arc::new(DummyObject { base: KObjectBase::default(), }) }\n} 是不是方便了很多？最后按照惯例，用单元测试检验实现的正确性： // src/object/mod.rs\n#[test]\nfn impl_kobject() { use alloc::format; let dummy = DummyObject::new(); let object: Arc<dyn KernelObject> = dummy; assert_eq!(object.type_name(), \"DummyObject\"); assert_eq!(object.name(), \"\"); object.set_name(\"dummy\"); assert_eq!(object.name(), \"dummy\"); assert_eq!( format!(\"{:?}\", object), format!(\"DummyObject({}, \\\"dummy\\\")\", object.id()) ); let _result: Arc<DummyObject> = object.downcast_arc::<DummyObject>().unwrap();\n} 有兴趣的读者可以继续探索使用功能更强大的 过程宏（proc_macro） ，进一步简化实现新内核对象所需的模板代码。 如果能把上面的代码块缩小成下面这两行，就更加完美了： #[KernelObject]\npub struct DummyObject;","breadcrumbs":"内核对象 » 模拟继承：用宏自动生成接口实现代码","id":"11","title":"模拟继承：用宏自动生成接口实现代码"},"12":{"body":"在这一节中我们用 Rust 语言实现了 Zircon 最核心的 内核对象 概念。在此过程中涉及到 Rust 的一系列语言特性和设计模式： 使用 trait 实现接口 使用 内部可变性 模式实现并发对象 基于社区解决方案实现 trait 到 struct 的 向下转换 使用组合模拟继承，并使用 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impl_kobject { // 匹配类型名，并可以提供函数覆盖默认实现 ($class:ident $( $fn:tt )*) => { // 为对象实现 KernelObject trait，方法直接转发到内部 struct impl KernelObject for $class { fn id(&self) -> KoID { // 直接访问内部的 pub 属性 self.base.id } fn type_name(&self) -> &str { // 用 stringify! 宏将输入转成字符串 stringify!($class) } // 注意宏里面的类型要写完整路径，例如：alloc::string::String fn name(&self) -> alloc::string::String { self.base.name() } fn set_name(&self, name: &str){ // 直接访问内部的 pub 方法 self.base.set_name(name) } // 可以传入任意数量的函数，覆盖 trait 的默认实现 $( $fn )* } // 为对象实现 Debug trait impl core::fmt::Debug for $class { fn fmt( &self, f: &mut core::fmt::Formatter<'_>, ) -> core::result::Result<(), core::fmt::Error> { // 输出对象类型、ID 和名称 f.debug_tuple(&stringify!($class)) .field(&self.id()) .field(&self.name()) .finish() } } };\n} 轮子已经造好了！让我们看看如何用它方便地实现一个内核对象，仍以 DummyObject 为例： // src/object/mod.rs\n/// 空对象\npub struct DummyObject { // 其中必须包含一个名为 `base` 的 `KObjectBase` base: KObjectBase,\n} // 使用刚才的宏，声明其为内核对象，自动生成必要的代码\nimpl_kobject!(DummyObject); impl 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拿到锁之后才能访问。此时并发访问已经安全，因此被包起来的结构自动具有了 Send + Sync 特性。 使用自旋锁引入了新的依赖库 spin ，需要在 Cargo.toml 中加入以下声明： [dependencies]\nspin = \"0.5\" 然后我们为新对象实现构造函数： // src/object/object.rs\nuse alloc::sync::Arc;\nuse core::sync::atomic::*; impl DummyObject { /// 创建一个新 `DummyObject` pub fn new() -> Arc<Self> { Arc::new(DummyObject { id: Self::new_koid(), inner: Default::default(), }) } /// 生成一个唯一的 ID fn new_koid() -> KoID { static NEXT_KOID: AtomicU64 = AtomicU64::new(1024); NEXT_KOID.fetch_add(1, Ordering::SeqCst) }\n} 根据文档描述，每个内核对象都有唯一的 ID。为此我们需要实现一个全局的 ID 分配方法。这里采用的方法是用一个静态变量存放下一个待分配 ID 值，每次分配就原子地 +1。 ID 类型使用 u64，保证了数值空间足够大，在有生之年都不用担心溢出问题。在 Zircon 中 ID 从 1024 开始分配，1024 以下保留作内核内部使用。 另外注意这里 new 函数返回类型不是 Self 而是 Arc<Self>，这是为了以后方便而做的统一约定。 最后我们为它实现 KernelObject 接口： // src/object/object.rs\nimpl KernelObject for DummyObject { fn id(&self) -> KoID { self.id } fn type_name(&self) -> &str { \"DummyObject\" } fn name(&self) -> String { self.inner.lock().name.clone() } fn set_name(&self, name: &str) { 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