zap_low_mappings

[Valdis.Kletnieks at vt.edu]

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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