How FreeBSD manage more than 4GB on 32 bits architecture

[Eduardo Morras]

On Thu, 09 Apr 2015 11:04:15 +0200
Pierre-Yves Péneau <Pierre-Yves.Peneau at lip6.fr> wrote:

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> Hi,
> 
> For my internship, I have to find a way to manage more than 4GB of
> memory with 32 bits processors. It seems that the FreeBSD kernel is
> the perfect candidate for that. According to the architecture handbook
> (*), "FreeBSD could theoretically handle memory configurations up to
> 8TB on a 32 bit platform."
> 
> For the last two days, I was looking for documentation, articles,
> thesis, or e-mails on that topic, but I can't find relevant
> informations. Is anybody have informations on that topic ? Where
> should I start to read the source code to find my answers ?

You are looking for PAE.

Check https://www.freebsd.org/doc/faq/hardware.html#idp56343376 as starting point.

> Thank you in advance.
> 
> 
> (*) https://www.freebsd.org/doc/en/books/arch-handbook/vm-kvm.html

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Eduardo Morras <emorrasg at yahoo.es>