Re: [Xen-devel] Unable to start PAE Mini-OS from 0x0

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 19 May 2006, at 22:35, Puthiyaparambil, Aravindh wrote:

> I am trying to start PAE Mini-OS from 0x0 so that I can get access to
> all 4GB. But it is failing in the builder (line 838 xc_linux_build.c)
> when it tries to pin the L3 table with the following error below.
> Further more, I am not able to bring up Mini-OS from any other address
> other than 0xc0000000.
>
> Is there a restriction on this in i386 PAE? Could someone please 
> explain
> why?
Xen absolutely requires that the 4th PAE pgdir slot is filled as Xen 
hijacks entries in the pmd to map itself. In fact the builder should 
probably simply allocate 4 pmd pages always, and always fill all 4 
slots of the top-level pgdir when running on PAE.
 -- Keir


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