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

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Message-ID: <m1y7k6vrfy.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 02 May 2007 15:36:17 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Gerd Hoffmann <kraxel@...hat.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" <hpa@...or.com> writes:

> Eric W. Biederman wrote:
>> 
>> So we won't do this casually and if it there are real problems we will
>> remove the ELF magic number.
>> 
>
> I think we can use ELF-compatible format just fine, but it would make
> more sense to use a non-ELF magic number from the start, instead of
> signalling it with a note.  Since bootloaders need to be aware, anyway,
> they can just detect this magic and treat is as an Linux calling
> convention ELF image, or they can not detect it, and treat it as a
> bzImage.  As a side benefit, we:
>
> a) can use a magic number that contains a jump instruction (to keep the
> non-bootsector happy);
> b) get a proper Linux kernel magic number.

To the best of my knowledge I have already resolved both of those concerns,
in my current code.

Eric
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