<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="The main module and entrypoint"><metaname="keywords"content="rust, rustlang, rust-lang, os"><title>os - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../SourceSerif4-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../FiraSans-Regular.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../FiraSans-Medium.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../SourceCodePro-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../SourceSerif4-Bold.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../SourceCodePro-Semibold.ttf.woff2"><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../ayu.css"disabled><linkrel="stylesheet"type="text/css"href="../dark.css"disabled><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptid="default-settings"></script><scriptsrc="../storage.js"></script><scriptsrc="../crates.js"></script><scriptdefersrc="../main.js"></script>
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</a><h2class="location"><ahref="#">Crate os</a></h2><divclass="sidebar-elems"><divclass="block"><ul><liclass="version">Version 0.1.0</li><li><aid="all-types"href="all.html">All Items</a></li></div></ul><section><divclass="block"><ul><li><ahref="#modules">Modules</a></li><li><ahref="#macros">Macros</a></li><li><ahref="#functions">Functions</a></li></ul></div></section><divid="sidebar-vars"data-name="os"data-ty="mod"data-relpath=""></div><scriptdefersrc="sidebar-items.js"></script></div></nav><main><divclass="width-limiter"><divclass="sub-container"><aclass="sub-logo-container"href="../os/index.html"><imgclass="rust-logo"src="../rust-logo.svg"alt="logo"></a><navclass="sub"><divclass="theme-picker hidden"><buttonid="theme-picker"aria-label="Pick another theme!"aria-haspopup="menu"title="themes"><imgwidth="22"height="22"alt="Pick another theme!"src="../brush.svg"></button><divid="theme-choices"role="menu"></div></div><formclass="search-form"><divclass="search-container"><span></span><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><buttontype="button"id="help-button"title="help">?</button><aid="settings-menu"href="../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../wheel.svg"></a></div></form></nav></div><sectionid="main-content"class="content"><divclass="main-heading">
<h1class="fqn"><spanclass="in-band">Crate <aclass="mod"href="#">os</a><buttonid="copy-path"onclick="copy_path(this)"title="Copy item path to clipboard"><imgsrc="../clipboard.svg"width="19"height="18"alt="Copy item path"></button></span></h1><spanclass="out-of-band"><aclass="srclink"href="../src/os/main.rs.html#1-65">source</a> · <aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass="inner">−</span>]</a></span></div><detailsclass="rustdoc-toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>The main module and entrypoint</p>
<li><ahref="syscall/index.html"title="syscall"><code>syscall</code></a>: System call handling and implementation</li>
</ul>
<p>The operating system also starts in this module. Kernel code starts
executing from <code>entry.asm</code>, after which <ahref="fn.rust_main.html"title="rust_main()"><code>rust_main()</code></a> is called to
initialize various pieces of functionality. (See its source code for
details.)</p>
<p>We then call <ahref="task/fn.run_first_task.html"title="task::run_first_task()"><code>task::run_first_task()</code></a> and for the first time go to
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="mod"href="console/index.html"title="os::console mod">console</a><spantitle="Restricted Visibility"> 🔒</span></div><divclass="item-right docblock-short"><p>SBI console driver, for text output</p>
</div></div><divclass="item-row"><divclass="item-left module-item"><aclass="mod"href="loader/index.html"title="os::loader mod">loader</a><spantitle="Restricted Visibility"> 🔒</span></div><divclass="item-right docblock-short"><p>Loading user applications into memory</p>
