linux-kernel - Re: [RFC PATCH 3/3] boot bzImages under paravirt

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Message-ID: <463B70F2.8020005@zytor.com>
Date:	Fri, 04 May 2007 10:44:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/3] boot bzImages under paravirt

Eric W. Biederman wrote:
> 
> Right after the segments loads we have:
> 	leal 0x40(%esi), %esp
> 	call 1f
> 1:	popl %ebp
> 	subl $1b, %ebp
> 
> That uses %ss and %ds.  Can we use a segment override on a call
> instruction?
> 

Nope.  As I said, not having %ss and %es set up is not realistic for
anything other than switching to our own GDT.

	-hpa
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