zap_low_mappings

[ishare]

On Thu, Mar 07, 2013 at 12:34:27AM -0500, Valdis.Kletnieks at vt.edu wrote:
> 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).

 Of course , the mapping of  address above  0xc0000000 have not been effected ever ,
 think about address 0x5 there is no phsical address mapping it . 

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