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📄 1_3 boot sector - 《自己动手写操作系统》 -2.htm

📁 10分钟完成的操作系统 - 《自己动手写操作系统》 - 2
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<H1><A href="http://book.csdn.net/bookfiles/88">自己动手写操作系统 </A></H1>
<DIV style="FONT-SIZE: 15px; TEXT-ALIGN: center"><A 
href="http://book.csdn.net/bookfiles/88/100882494.shtml">1.3 Boot Sector 
</A></DIV>
<DIV style="FONT-SIZE: 15px; TEXT-ALIGN: center"><A class=url 
href="http://book.csdn.net/">http://book.csdn.net/</A> 2006-8-11 18:35:00 </DIV>
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</DIV>
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<H1 id=divCurrentNode 
style="PADDING-LEFT: 2px; FONT-SIZE: 12px; WIDTH: 100%; COLOR: #b83507; TEXT-ALIGN: left">当前章节:<A 
href="http://book.csdn.net/bookfiles/88/100882494.shtml"><FONT color=red>1.3 
Boot Sector</FONT></A></H1>
<DIV id=divRelateNode style="PADDING-LEFT: 2px">
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882492.shtml">1.1 准备工作</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882493.shtml">1.2 
10分钟完成的操作系统</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882495.shtml">1.4 代码解释</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882496.shtml">1.5 水面下的冰山</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882497.shtml">1.6 回顾</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882498.shtml">2.1 虚拟计算机（Virtual 
PC）</A></DIV></DIV></DIV></DIV>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT 
size=2><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">你可能还没有从刚刚的兴奋中走出来，可是我不得不告诉你，实际上，你刚刚所完成的并不是一个完整的</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">OS</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，而仅仅是一个最最简单的引导扇区（</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。然而不管我们完成的是什么，至少，它是直接在裸机上运行的，不依赖于任何其他软件，所以，这和我们平时所编写的应用软件有本质的区别。它不是操作系统，但已经具备了操作系统的一个特性。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT 
size=2><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们知道，当计算机电源被打开时，它会先进行加电自检（</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">POST</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），然后寻找启动盘，如果是选择从软盘启动，计算机就会检查软盘的</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">面</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">磁道</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">扇区，如果发现它以</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0xAA55</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（假如我们把此扇区看做一个字符数组</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">sector[]</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的话，那么此结束标志相当于</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">sector[510]=0x55</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，且</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">sector[511]=0xAA</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）结束，则</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">BIOS</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">认为它是一个引导扇区，也就是我们说的</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。当然，一个正确的</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">除了以</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0xAA55</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">结束之外，还应该包含一段少于</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">512B</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的执行码。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT 
size=2><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">好了，一旦</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">BIOS</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">发现了</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，就会将这</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">512B</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的内容装载到内存的</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0000:<ST1:CHMETCNV w:st="on" tcsc="0" 
numbertype="1" negative="False" hasspace="False" sourcevalue="7" 
unitname="C">7c</ST1:CHMETCNV>00</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处，然后跳转到</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">0000:<ST1:CHMETCNV w:st="on" tcsc="0" 
numbertype="1" negative="False" hasspace="False" sourcevalue="7" 
unitname="C">7c</ST1:CHMETCNV>00</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处将控制权彻底交给这段引导代码。到此为止，计算机不再由</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">BIOS</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中固有的程序来控制，而变成由操作系统的一部分来控制。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT 
size=2><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">现在，你可能明白了为什么在那段代码的第一行会出现</SPAN><SPAN 
lang=EN-US><FONT face="Times New Roman">org <ST1:CHMETCNV w:st="on" tcsc="0" 
numbertype="1" negative="False" hasspace="False" sourcevalue="7" 
unitname="C">07c</ST1:CHMETCNV>00</FONT></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这样的代码。没错，这行代码就是告诉编译器，将来我们的这段程序要被加载到内存偏移地址</SPAN><FONT 
face="Times New Roman"><ST1:CHMETCNV w:st="on" tcsc="0" numbertype="1" 
negative="False" hasspace="False" sourcevalue="7" unitname="C"><SPAN 
lang=EN-US>7c</SPAN></ST1:CHMETCNV><SPAN lang=EN-US>00</SPAN></FONT><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处。好了，下面将对代码的其他部分进行详细解释。</SPAN></FONT><SPAN 
lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></P></DIV><!-- page -->
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<H1 id=divCurrentNode2 
style="PADDING-LEFT: 2px; FONT-SIZE: 12px; WIDTH: 100%; COLOR: #b83507; TEXT-ALIGN: left">当前章节:<A 
href="http://book.csdn.net/bookfiles/88/100882494.shtml"><FONT color=red>1.3 
Boot Sector</FONT></A></H1>
<DIV id=divRealteNod2 style="PADDING-LEFT: 2px">
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882492.shtml">1.1 准备工作</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882493.shtml">1.2 
10分钟完成的操作系统</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882495.shtml">1.4 代码解释</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882496.shtml">1.5 水面下的冰山</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882497.shtml">1.6 回顾</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A 
href="http://book.csdn.net/bookfiles/88/100882498.shtml">2.1 虚拟计算机（Virtual 
PC）</A></DIV></DIV></DIV></DIV>
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