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Date: Fri, 04 May 2007 10:44:18 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: "Eric W. Biederman" <ebiederm@xmission.com>
CC: Jeremy Fitzhardinge <jeremy@goop.org>,
       Rusty Russell <rusty@rustcorp.com.au>, Andi Kleen <ak@suse.de>,
       Chris Wright <chrisw@sous-sol.org>, Zachary Amsden <zach@vmware.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 3/3] boot bzImages under paravirt
References: <1178283582.23670.67.camel@localhost.localdomain>	<1178283724.23670.70.camel@localhost.localdomain>	<1178284052.23670.75.camel@localhost.localdomain>	<m1ps5gslfm.fsf@ebiederm.dsl.xmission.com> <463B4E12.50703@goop.org>	<m1r6pwr0yy.fsf@ebiederm.dsl.xmission.com> <463B6C8A.9080206@goop.org> <m11whwqymy.fsf@ebiederm.dsl.xmission.com>
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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