linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Message-ID: <47991809.9060903@goop.org>
Date:	Thu, 24 Jan 2008 14:58:17 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ian Campbell <ijc@...lion.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Mika Penttilä <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native
 format.

H. Peter Anvin wrote:
> Yeah, and it's ugly for the kernel proper, so that bit is a 
> no-brainer.  It's just a matter of hammering out the details.
>
> It doesn't sound from the above that you have any opinion either way 
> about reusing the initial page tables or creating a new set, as long 
> as they're in the same format. 

Right.

Xen provides a initial set of pagetables in the appropriate format, so 
what head.S generates is moot.  For simplicity I graft the Xen-provided 
pagetables into swapper_pg_dir in xen_start_kernel, so it is the 
functional equivalent to the head.S pagetable construction.

We also don't (yet) support PSE, so that's a non-issue for us too.

    J
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