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Subject: Re: High Mem Options
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Michael Vergoz <mvergoz@sysdoor.com>
Cc: timothy.a.reed@lmco.com,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wed, 2003-03-05 at 12:49, Michael Vergoz wrote:
> Hi Alan,
> 
> That i can't understand i when the system going to the protect mode. 
> How the system can use over 4GB memory ?

In PAE mode the later CPUS have 32bit virtual addresses but the page
table entries to map these allow 36bit physical addresses. It means you
can't address more than 4Gb at a time without updating MMU tables
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