c05.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Chapter 05</TITLE></HEAD><BODY><B>up:</B> <A HREF="toc.htm">Table of Contents</A><BR><B>prev:</B> <A HREF="s04_02.htm">4.2 Systems Instructions</A><BR><B>next:</B> <A HREF="s05_01.htm">5.1 Segment Translation</A><P><HR><P><H1>Chapter 5 Memory Management</H1><P>The 80386 transforms logical addresses (i.e., addresses as viewed byprogrammers) into physical address (i.e., actual addresses in physicalmemory) in two steps:<UL><LI>Segment translation, in which a logical address (consisting of a segment selector and segment offset) are converted to a linear address.<LI>Page translation, in which a linear address is converted to a physical address. This step is optional, at the discretion of systems-software designers.</UL>These translations are performed in a way that is not visible toapplications programmers. <A HREF="#fig5-1">Figure 5-1</A> illustrates the two translations at ahigh level of abstraction.<P><A HREF="#fig5-1">Figure 5-1</A> and the remainder of this chapter present a simplified view ofthe 80386 addressing mechanism. In reality, the addressing mechanism alsoincludes memory protection features. For the sake of simplicity, however,the subject of protection is taken up in another chapter, <A HREF="c06.htm">Chapter 6</A>.<P><A NAME="fig5-1"><IMG align=center SRC="fig5-1.gif" border=0><P><A HREF="s05_01.htm">5.1 Segment Translation</A><BR><A HREF="s05_02.htm">5.2 Page Translation</A><BR><A HREF="s05_03.htm">5.3 Combining Segment and Page Translation</A><P><HR><P><B>up:</B> <A HREF="toc.htm">Table of Contents</A><BR><B>prev:</B> <A HREF="s04_02.htm">4.2 Systems Instructions</A><BR><B>next:</B> <A HREF="s05_01.htm">5.1 Segment Translation</A></BODY>⌨️ 快捷键说明
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