linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Message-ID: <463918CF.4000202@goop.org>
Date:	Wed, 02 May 2007 16:03:43 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Gerd Hoffmann <kraxel@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeff Garzik <jeff@...zik.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org, Vivek Goyal <vgoyal@...ibm.com>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for
 relocatable bzImage

H. Peter Anvin wrote:
> I don't know if that would break any programs that are currently
> bypassing the setup.  The existing setup protocol definitely allows
> invoking an entry point which isn't 0x100000 (rather, the 32-bit
> entrypoint is defined by code32_start); I'm not sure how Eric's
> relocatable kernel patches (2.05 protocol) affect that, mostly because I
> haven't seen any boot loaders which actually use it so I can't comment
> on what their code looks like.

Yes, I'd expect that code32_start would point into the ELF text
segment.   You could align things so that the entrypoint is still
actually 0x100000, or bump it up a bit to fit the ELF headers.  I have
to admit I don't quite understand how all that fits together at the moment.

    J

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