On Thu, 07 Mar 2013 12:48:06 +0800, ishare said: > because all the pde (0-768) are set to 0x0 ,so no phsical pages are > mapping to these pde . > isn't it?
The pdes don't end at 768. Think about what pde numbers the kernel gets when it loads at 0xc0000000 (which is where it lands with the default 3G/1G split).
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