Re: High Mem Options

Alan Cox (
05 Mar 2003 14:21:11 +0000

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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