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<TD><B> 80386ASM程序設計基礎(十一)</B> kingcaiyao（原作）
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<TD width=500> 80386ASM</TD></TR>
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<P> 主要介紹系統地址寄存器和控制寄存器以及在程序中實方式下與保護方式下的切換<BR>
80386處理器新增了一組控制寄存器CR0,CR1,CR2,CR3和一組系統地址寄存器GDTR,LDTR,IDTR,TR，它們全部都是32位的。CR0包含了指定處理器工作方式的控制位，CR1保留未使用，CR2和CR3由分頁管理部件使用，CR0中的5~30位和CR3中的0~11位必須為0，分別介紹如下：<BR>
<BR>
___________________________________________________________________________<BR>
|PG|0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0 |0
|ET|TS|EM|MP|PE| CR0<BR>
|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|__|_
|__| <BR>
|
Reserved
| CR1<BR>
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