?? 1_3 boot sector - 《自己動手寫操作系統》 -2.htm
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<H1><A href="http://book.csdn.net/bookfiles/88">自己動手寫操作系統 </A></H1>
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<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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style="PADDING-LEFT: 2px; FONT-SIZE: 12px; WIDTH: 100%; COLOR: #b83507; TEXT-ALIGN: left">當前章節:<A
href="http://book.csdn.net/bookfiles/88/100882494.shtml"><FONT color=red>1.3
Boot Sector</FONT></A></H1>
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<DIV style="FLOAT: left; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882492.shtml">1.1 準備工作</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882493.shtml">1.2
10分鐘完成的操作系統</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882495.shtml">1.4 代碼解釋</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 回顧</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882498.shtml">2.1 虛擬計算機（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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">你可能還沒有從剛剛的興奮中走出來，可是我不得不告訴你，實際上，你剛剛所完成的并不是一個完整的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">OS</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，而僅僅是一個最最簡單的引導扇區（</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。然而不管我們完成的是什么，至少，它是直接在裸機上運行的，不依賴于任何其他軟件，所以，這和我們平時所編寫的應用軟件有本質的區別。它不是操作系統，但已經具備了操作系統的一個特性。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT
size=2><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我們知道，當計算機電源被打開時，它會先進行加電自檢（</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">POST</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），然后尋找啟動盤，如果是選擇從軟盤啟動，計算機就會檢查軟盤的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">0</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">扇區，如果發現它以</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">0xAA55</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（假如我們把此扇區看做一個字符數組</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">sector[]</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的話，那么此結束標志相當于</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">sector[510]=0x55</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）結束，則</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">BIOS</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">認為它是一個引導扇區，也就是我們說的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。當然，一個正確的</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">結束之外，還應該包含一段少于</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">512B</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的執行碼。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT
size=2><SPAN
style="FONT-FAMILY: 宋體; 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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">發現了</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">Boot Sector</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，就會將這</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">512B</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的內容裝載到內存的</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">處，然后跳轉到</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">處將控制權徹底交給這段引導代碼。到此為止，計算機不再由</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">BIOS</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中固有的程序來控制，而變成由操作系統的一部分來控制。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 20pt"><FONT
size=2><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">現在，你可能明白了為什么在那段代碼的第一行會出現</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">這樣的代碼。沒錯，這行代碼就是告訴編譯器，將來我們的這段程序要被加載到內存偏移地址</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: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">處。好了，下面將對代碼的其他部分進行詳細解釋。</SPAN></FONT><SPAN
lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></P></DIV><!-- page -->
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Boot Sector</FONT></A></H1>
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<DIV style="FLOAT: left; WIDTH: 49%">·<A
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<DIV style="FLOAT: right; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882493.shtml">1.2
10分鐘完成的操作系統</A></DIV>
<DIV style="FLOAT: left; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882495.shtml">1.4 代碼解釋</A></DIV>
<DIV style="FLOAT: right; WIDTH: 49%">·<A
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<DIV style="FLOAT: left; WIDTH: 49%">·<A
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<DIV style="FLOAT: right; WIDTH: 49%">·<A
href="http://book.csdn.net/bookfiles/88/100882498.shtml">2.1 虛擬計算機（Virtual
PC）</A></DIV></DIV></DIV></DIV>
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