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

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Message-ID: <m1fy6kdzi1.fsf@ebiederm.dsl.xmission.com>
Date:	Sat, 28 Apr 2007 14:18:14 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Andi Kleen <ak@...e.de>, patches@...-64.org,
	Vivek Goyal <vgoyal@...ibm.com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

Jeff Garzik <jeff@...zik.org> writes:

> Andi Kleen wrote:
>> From: Vivek Goyal <vgoyal@...ibm.com>
>> 
>> 
>> o Extend the bzImage protocol (same as i386) to allow bzImage loaders to
>>   load the protected mode kernel at non-1MB address. Now protected mode
>>   component is relocatable and can be loaded at non-1MB addresses.
>> 
>> o As of today kdump uses it to run a second kernel from a reserved memory
>>   area.
>> 
>> Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
>> Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
>> Signed-off-by: Andi Kleen <ak@...e.de>
>
> Can you point to / link to threads where the bootloader folks looked 
> over the reloc changes from their side, and commented?

Jeff what is your concern.

The boot protocol change is in 2.6.21 for arch/i386.

HPA looked at it a while ago.

All it does is set a flag that tells a bootloader.
"Hey. I can run when loaded a non-default address, and this is what
 you have to align me to."

All relocation processing happens in the kernel itself.

So it is all pretty trivial.

Eric
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