linux-kernel - Re: [GIT PULL] x86 setup: correct booting on 486 (revised)

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Date:	Tue, 06 Nov 2007 10:04:13 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Mikael Petterson <mikpe@...uu.se>
Subject: Re: [GIT PULL] x86 setup: correct booting on 486 (revised)

"H. Peter Anvin" <hpa@...or.com> writes:

> Jeremy Fitzhardinge wrote:
>> H. Peter Anvin wrote:
>>> The ELF note format is sane enough, although it looks like it's not
>>> self-terminating, so we'd either need an offset and a length field, or
>>> adopt the convention that namesz = descsz = type = 0 terminates the
>>> block (I prefer the latter, myself.)
>>
>> Hm, I think offset+length would be better: it's how they're represented
>> in a normal ELF file, so you can just extract the length if you're
>> extracting the notes.  Also, generating a terminating note with the
>> current linker-based notes machinery would be a bit of a pain.
>
> .notes : {
> 	*(.note.*)
> 	. = ALIGN(4);
> 	LONG(0);
> 	LONG(0);
> 	LONG(0);
> }
>
> Am I missing something?

I don't think adding a length any harder.

The all zero note is reserved so using it this way should be ok.
Regardless this sounds like a sane thing to be looking at.

Eric
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