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List:       linux-kernel
Subject:    Re: x86 PAT errata
From:       Jeff Hartmann <jhartmann () valinux ! com>
Date:       2001-01-25 17:51:32
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Mikael Pettersson wrote:

> Before people get too exited about the x86 Page Attribute Table ...
> Does Linux use mode B (CR4.PSE=1) or mode C (CR4.PAE=1) paging?
> If so, known P6 errata must be taken into account.
> In particular, Pentium III errata E27 and Pentium II errata A56
> imply that only the low four PAT entries are working for 4KB
> pages, if CR4.PSE or CR4.PAE is enabled.
> 
> /Mikael
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Yes it does use PSE/PAE paging.  Could you point me to these errata 
documents?  According to the documentation I've seen it says that only 
the low four PAT entries work for 4MB pages.  I've never seen 
documentation that says the same is true for 4k pages.

-Jeff

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