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

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Message-ID: <472F61C8.4040300@zytor.com>
Date:	Mon, 05 Nov 2007 10:32:40 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Mikael Petterson <mikpe@...uu.se>,
	Eric Biederman <ebiederm@...ssion.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [GIT PULL] x86 setup: correct booting on 486 (revised)

Linus Torvalds wrote:
> 
> Final comment: shouldn't we set up %esp to be correct for the new %ss too?
> 

Well, the 32-bit code needs to set up its own stack, and only it knows 
where it wants its stack; we don't guarantee that the stack is valid 
when we enter the 32-bit code and we're entering with both INT and NMI 
disabled (requiring a stack would probably break all existing users of 
the 32-bit entrypoint.)

However, that being said, doing so is trivial, and it might help some 
debugging hack; anything that makes debugging easier is a Good Thing[TM].

	-hpa
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