linux-kernel - Re: [PATCH v3 01/12] x86, boot: move verify

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Date:	Wed, 21 Nov 2012 21:48:51 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v3 01/12] x86, boot: move verify_cpu.S after 0x200

Yinghai Lu <yinghai@...nel.org> writes:

> On Wed, Nov 21, 2012 at 11:50 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> The comment is just plain wrong.  It assumes you're loading an ELF file,
>> whereas in practice that is rarely true.
>>
>> This does explain why the poor ABI, though.  A jump table at the
>> beginning would have been a lot cleaner.
>
> Can you please have patch to update the comments and point to the API there ?

Long ago and far away.  I wrote the 64bit entry code for a bzImage by
putting an ELF header in the boot sector.  That is what that comment
referred to when it was written.  Andrew had a problem on one of his
test machines and so the patch to bootsector was dropped.

Booting with a vmlinux file does (or at least should not) need this.
ELF loaders will pick the entry point out from the ELF header.

I don't know what has happened in the intervening time, or who if anyone
has depended on that offset.  The original intent an internal use hard
code.

Eric

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