114 lines
4.9 KiB
HTML
114 lines
4.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<meta http-equiv="X-UA-Compatible" content="IE=9"/>
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<meta name="generator" content="Doxygen 1.8.18"/>
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<meta name="viewport" content="width=device-width, initial-scale=1"/>
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<title>MyOS Kernel: Format of a paging structure entry</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<script type="text/javascript" src="jquery.js"></script>
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<script type="text/javascript" src="dynsections.js"></script>
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<link href="navtree.css" rel="stylesheet" type="text/css"/>
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<script type="text/javascript" src="resize.js"></script>
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<script type="text/javascript" src="navtreedata.js"></script>
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<script type="text/javascript" src="navtree.js"></script>
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<link href="search/search.css" rel="stylesheet" type="text/css"/>
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<script type="text/javascript" src="search/searchdata.js"></script>
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<script type="text/javascript" src="search/search.js"></script>
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<link href="doxygen.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
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<div id="titlearea">
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<table cellspacing="0" cellpadding="0">
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<tbody>
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<tr style="height: 56px;">
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<td id="projectalign" style="padding-left: 0.5em;">
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<div id="projectname">MyOS Kernel
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</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<!-- end header part -->
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<!-- Generated by Doxygen 1.8.18 -->
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<script type="text/javascript">
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/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
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var searchBox = new SearchBox("searchBox", "search",false,'Search');
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/* @license-end */
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</script>
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<script type="text/javascript" src="menudata.js"></script>
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<script type="text/javascript" src="menu.js"></script>
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<script type="text/javascript">
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/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
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$(function() {
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initMenu('',true,false,'search.php','Search');
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$(document).ready(function() { init_search(); });
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});
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/* @license-end */</script>
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<div id="main-nav"></div>
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</div><!-- top -->
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<div id="side-nav" class="ui-resizable side-nav-resizable">
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<div id="nav-tree">
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<div id="nav-tree-contents">
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<div id="nav-sync" class="sync"></div>
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</div>
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</div>
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<div id="splitbar" style="-moz-user-select:none;"
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class="ui-resizable-handle">
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</div>
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</div>
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<script type="text/javascript">
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/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
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$(document).ready(function(){initNavTree('pg_struct_entry.html',''); initResizable(); });
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/* @license-end */
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</script>
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<div id="doc-content">
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<!-- window showing the filter options -->
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<div id="MSearchSelectWindow"
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onmouseover="return searchBox.OnSearchSelectShow()"
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onmouseout="return searchBox.OnSearchSelectHide()"
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onkeydown="return searchBox.OnSearchSelectKey(event)">
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</div>
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<!-- iframe showing the search results (closed by default) -->
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<div id="MSearchResultsWindow">
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<iframe src="javascript:void(0)" frameborder="0"
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name="MSearchResults" id="MSearchResults">
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</iframe>
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</div>
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<div class="PageDoc"><div class="header">
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<div class="headertitle">
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<div class="title">Format of a paging structure entry </div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><p>The format of a page table/directiry entry is as following: <br />
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Bits 31-11 is the physical frame number the entry points to. <br />
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Bits 11-9 are availible for use by the OS. <br />
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Bit 8 is ignored. <br />
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Bit 7 is the page size in page directories, and must be 0 in page tables. If set to 1 in a page directory, it indicates 4MB pages. <br />
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Bit 6 is the dirty bit in page tables, and must be 0 in page directories. In page tabes, it is set to 1 by the CPU when the page is written to. <br />
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Bit 5 will be set to 1 by the CPU when the page is accessed. <br />
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Bit 4 indicates whether the page has it's cache disabled. <br />
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Bit 3 indictates whether write-through caching (when it is 1), or write-back caching, (when it is 0) is enabled. <br />
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Bit 2 indictaes whether user mode code can access the page. <br />
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Bit 1 indicates whether the page is writable. <br />
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Bit 0 indicates whether the entry is present. If it is 0, the CU ignores the other 31 bits of the entry. <br />
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Privlege bits in the entries are ANDed together, so the most restrictive privlege between the page directory and the page table wins. </p>
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</div></div><!-- contents -->
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</div><!-- PageDoc -->
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</div><!-- doc-content -->
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<!-- start footer part -->
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<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
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<ul>
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<li class="footer">Generated by
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.18 </li>
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</ul>
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</div>
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</body>
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</html>
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