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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><link rel="STYLESHEET" type="text/css" href="wrs.css"><title> Virtual Memory Interface </title></head><body bgcolor="FFFFFF"><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="GuideIX.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-vm.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-vm.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-vm2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p><font face="Helvetica, sans-serif" class="sans"><h3 class="H2"><i><a name="84374">7.1 Introduction</a></i></h3></font><dl class="margin"><dl class="margin"><dd><p class="Body"><a name="84376"> </a>VxWorks provides two levels of virtual memory support. The basic level is bundled with VxWorks and provides caching on a per-page basis. The full level is unbundled, and requires the optional component, VxVMI. VxVMI provides write protection of text segments and the VxWorks exception vector table, and an architecture-independent interface to the CPU's memory management unit (MMU). For information on how to install VxVMI, see <i class="title">Tornado Getting Started</i>. </p><dd><p class="Body"><a name="84377"> </a>This chapter contains the following sections:</p></dl><dl class="margin"><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84378"> </a>The first describes the basic level of support. </li></ul></p><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84379"> </a>The second describes configuration, and is applicable to both levels of support. </li></ul></p><p class="listspace"><ul class="Bullet" type="disc"><li><a name="84380"> </a>The third and fourth parts apply only to the optional component, VxVMI:</li></ul></p><dl class="margin"><p class="listspace"><ul class="Dash2" type="circle"><li><a name="84381"> </a>The third is for general use, discussing the write protection implemented by VxVMI. </li></ul></p><p class="listspace"><ul class="Dash2" type="circle"><li><a name="84382"> </a>The fourth describes a set of routines for manipulating the MMU. VxVMI provides low-level routines for interfacing with the MMU in an architecture-independent manner, allowing you to implement your own virtual memory systems.</li></ul></p></dl></dl></dl><a name="foot"><hr></a><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="GuideIX.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-vm.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-vm.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-vm2.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p></body></html><!---by WRS Documentation (), Wind River Systems, Inc. conversion tool: Quadralay WebWorks Publisher 4.0.11 template: CSS Template, Jan 1998 - Jefro --->⌨️ 快捷键说明
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