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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Memory management implementation"><meta name="keywords" content="rust, rustlang, rust-lang, mm"><title>os::mm - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module mm</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div></section></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../os/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">os</a>::<wbr><a class="mod" href="#">mm</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/os/mm/mod.rs.html#1-29">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Memory management implementation</p>
<p>SV39 page-based virtual-memory architecture for RV64 systems, and
everything about memory management, like frame allocator, page table,
map area and memory set, is implemented here.</p>
<p>Every task or process has a memory_set to control its virtual memory.</p>
</div></details><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="mod" href="address/index.html" title="os::mm::address mod">address</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"><p>Implementation of physical and virtual address and page number.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="frame_allocator/index.html" title="os::mm::frame_allocator mod">frame_allocator</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"><p>Implementation of <a href="frame_allocator/trait.FrameAllocator.html" title="FrameAllocator"><code>FrameAllocator</code></a> which
controls all the frames in the operating system.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="heap_allocator/index.html" title="os::mm::heap_allocator mod">heap_allocator</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"><p>The global allocator</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="memory_set/index.html" title="os::mm::memory_set mod">memory_set</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"><p>Implementation of <a href="memory_set/struct.MapArea.html" title="MapArea"><code>MapArea</code></a> and <a href="memory_set/struct.MemorySet.html" title="MemorySet"><code>MemorySet</code></a>.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="page_table/index.html" title="os::mm::page_table mod">page_table</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"><p>Implementation of <a href="page_table/struct.PageTableEntry.html" title="PageTableEntry"><code>PageTableEntry</code></a> and <a href="page_table/struct.PageTable.html" title="PageTable"><code>PageTable</code></a>.</p>
</div></div></div><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.FrameTracker.html" title="os::mm::FrameTracker struct">FrameTracker</a></div><div class="item-right docblock-short"><p>manage a frame which has the same lifecycle as the tracker</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.KERNEL_SPACE.html" title="os::mm::KERNEL_SPACE struct">KERNEL_SPACE</a></div><div class="item-right docblock-short"><p>a memory set instance through lazy_static! managing kernel space</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.MapPermission.html" title="os::mm::MapPermission struct">MapPermission</a></div><div class="item-right docblock-short"><p>map permission corresponding to that in pte: <code>R W X U</code></p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.MemorySet.html" title="os::mm::MemorySet struct">MemorySet</a></div><div class="item-right docblock-short"><p>memory set structure, controls virtual-memory space</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PageTable.html" title="os::mm::PageTable struct">PageTable</a></div><div class="item-right docblock-short"><p>Record root ppn and has the same lifetime as 1 and 2 level <code>PageTableEntry</code></p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PageTableEntry.html" title="os::mm::PageTableEntry struct">PageTableEntry</a></div><div class="item-right docblock-short"><p>page table entry structure</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PhysAddr.html" title="os::mm::PhysAddr struct">PhysAddr</a></div><div class="item-right docblock-short"><p>Definitions</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PhysPageNum.html" title="os::mm::PhysPageNum struct">PhysPageNum</a></div><div class="item-right docblock-short"><p>phiscal page number</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.UserBuffer.html" title="os::mm::UserBuffer struct">UserBuffer</a></div><div class="item-right docblock-short"><p>Array of u8 slice that user communicate with os</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.UserBufferIterator.html" title="os::mm::UserBufferIterator struct">UserBufferIterator</a></div><div class="item-right docblock-short"><p>Iterator of <code>UserBuffer</code></p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.VirtAddr.html" title="os::mm::VirtAddr struct">VirtAddr</a></div><div class="item-right docblock-short"><p>virtual address</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.VirtPageNum.html" title="os::mm::VirtPageNum struct">VirtPageNum</a></div><div class="item-right docblock-short"><p>virtual page number</p>
</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.StepByOne.html" title="os::mm::StepByOne trait">StepByOne</a></div><div class="item-right docblock-short"><p>Add value by one</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.frame_alloc.html" title="os::mm::frame_alloc fn">frame_alloc</a></div><div class="item-right docblock-short"><p>allocate a frame</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.frame_dealloc.html" title="os::mm::frame_dealloc fn">frame_dealloc</a></div><div class="item-right docblock-short"><p>deallocate a frame</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.init.html" title="os::mm::init fn">init</a></div><div class="item-right docblock-short"><p>initiate heap allocator, frame allocator and kernel space</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.kernel_token.html" title="os::mm::kernel_token fn">kernel_token</a></div><div class="item-right docblock-short"><p>Get kernelspace root ppn</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.remap_test.html" title="os::mm::remap_test fn">remap_test</a></div><div class="item-right docblock-short"><p>Check PageTable running correctly</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.translated_byte_buffer.html" title="os::mm::translated_byte_buffer fn">translated_byte_buffer</a></div><div class="item-right docblock-short"><p>Translate a pointer to a mutable u8 Vec through page table</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.translated_ref.html" title="os::mm::translated_ref fn">translated_ref</a></div><div class="item-right docblock-short"><p>Translate a generic through page table and return a reference</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.translated_refmut.html" title="os::mm::translated_refmut fn">translated_refmut</a></div><div class="item-right docblock-short"><p>Translate a generic through page table and return a mutable reference</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.translated_str.html" title="os::mm::translated_str fn">translated_str</a></div><div class="item-right docblock-short"><p>Translate a pointer to a mutable u8 Vec end with <code>\0</code> through page table to a <code>String</code></p>
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