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                         我注意到CR4寄存器中的PAE位在我的 
 Linux(3.19)x86-64机器上打开了. PAE功能允许访问高达64gb的物理地址,但我不明白为什么在启用长模式时需要它.我已经查了一会儿,但没有找到任何令人满意的答案. 
  
  有什么建议? 
解决方法
 它使用IA-32e分页. 
  
  
  
  A logical processor uses IA-32e paging if CR0.PG = 1,CR4.PAE = 1,and IA32_EFER.LME = 1.  With IA-32e paging,linear address are translated using a hierarchy of in-memory paging structures located using the contents of CR3.  IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.  Although 52 bits corresponds to 4 PBytes,linear addresses are limited to 48 bits; at most 256 TBytes of linear-address space may be accessed at any  given time.  
   
 x86处理器支持三种分页模式:  
 > 32位分页(CR0.PG = 1,CR4.PAE = 0) > PAE分页(CR0.PG = 1,CR4.PAE = 1,IA32_EFER.LME = 0) > IA-32e寻呼(CR0.PG = 1,IA32_EFER.LME = 1)  
 这里报告了一个总结差异的表格(不幸的是,图像)  
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