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Date: Thu, 04 Nov 2010 13:07:29 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Alan Cox <alc@rice.edu>
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Cc: Alan Cox <alc@freebsd.org>, freebsd-current@freebsd.org
Subject: Re: minidump size on amd64
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on 04/11/2010 08:05 Alan Cox said the following:
> 
> There is actually a point to using PG_PS_FRAME.  The PAT bit for a 2MB page
> mapping occupies a bit that is a part of the physical page number with PG_FRAME. 
> I suspect that the same is true of 1GB page mappings, but I haven't double checked
> the manual.

Ah, yes, you are right - bit 12 is a part of an address in PTE, but is used for
PAT in PDE or PDPE if PS bit is 1.

-- 
Andriy Gapon