From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Mikael Petterson <mikpe@it.uu.se>,
Eric Biederman <ebiederm@xmission.com>,
Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [GIT PULL] x86 setup: correct booting on 486 (revised)
Date: Mon, 05 Nov 2007 10:32:40 -0800 [thread overview]
Message-ID: <472F61C8.4040300@zytor.com> (raw)
In-Reply-To: <alpine.LFD.0.999.0711051006060.15101@woody.linux-foundation.org>
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
next prev parent reply other threads:[~2007-11-05 18:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-05 2:16 [GIT PULL] x86 setup: correct booting on 486 (revised) H. Peter Anvin
2007-11-05 3:58 ` H. Peter Anvin
2007-11-05 17:15 ` Linus Torvalds
2007-11-05 17:56 ` H. Peter Anvin
2007-11-05 18:12 ` Linus Torvalds
2007-11-05 18:32 ` H. Peter Anvin [this message]
2007-11-05 18:36 ` Linus Torvalds
2007-11-05 20:21 ` Eric W. Biederman
2007-11-05 20:31 ` H. Peter Anvin
2007-11-05 20:51 ` Jeremy Fitzhardinge
2007-11-05 21:06 ` H. Peter Anvin
2007-11-06 0:59 ` Jeremy Fitzhardinge
2007-11-06 1:11 ` H. Peter Anvin
2007-11-06 1:18 ` Jeremy Fitzhardinge
2007-11-06 1:31 ` H. Peter Anvin
2007-11-06 16:17 ` Jeremy Fitzhardinge
2007-11-06 16:27 ` H. Peter Anvin
2007-11-06 16:55 ` Jeremy Fitzhardinge
2007-11-06 17:00 ` H. Peter Anvin
2007-11-06 17:09 ` Eric W. Biederman
2007-11-06 17:57 ` H. Peter Anvin
2007-11-06 18:27 ` Eric W. Biederman
2007-11-06 18:41 ` H. Peter Anvin
2007-11-06 17:04 ` Eric W. Biederman
2007-11-05 21:14 ` Eric W. Biederman
2007-11-05 21:28 ` H. Peter Anvin
2007-11-05 21:58 ` Eric W. Biederman
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