From owner-freebsd-smp  Mon Sep  2 12:53:06 1996
Return-Path: owner-smp
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id MAA09320
          for smp-outgoing; Mon, 2 Sep 1996 12:53:06 -0700 (PDT)
Received: from clem.systemsix.com (clem.systemsix.com [198.99.86.131])
          by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id MAA09315
          for <freebsd-smp@freebsd.org>; Mon, 2 Sep 1996 12:53:03 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by clem.systemsix.com (8.6.12/8.6.12) with SMTP id NAA06411; Mon, 2 Sep 1996 13:51:28 -0600
Message-Id: <199609021951.NAA06411@clem.systemsix.com>
X-Authentication-Warning: clem.systemsix.com: Host localhost didn't use HELO protocol
X-Mailer: exmh version 1.6.5 12/11/95
From: Steve Passe <smp@csn.net>
To: erich@uruk.org
cc: Terry Lambert <terry@lambert.org>, freebsd-smp@freebsd.org,
        rv@groa.uct.ac.za
Subject: Re: SMP on Intel MG15 
In-reply-to: Your message of "Mon, 02 Sep 1996 12:34:43 PDT."
             <199609021934.MAA18360@uruk.org> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Mon, 02 Sep 1996 13:51:28 -0600
Sender: owner-smp@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

Hi,

>This is incorrect.  The XXPRESS box that I had REQUIRED the setting of the
>"warm start vector" to operate correctly.  Only by completing the
>generic startup code was I able to get many Pentium systems to work
>correctly on Linux-SMP.

I had already decided to pursue this line of attack and added a vector
to a "HLT" instruction, then going on to let the STARTUP IPI launch 
the actual startup code.  this works on my (GA586DX, 2 133mHz P5s)
box, but no diff on the XXPRESS machine.  so I suggested Russel change
HLT to "INT $2", ie NMI to this vector point, which caused the machine to hang.
so I think the INIT/RESET IPI does something right.

so now I am trying to make the INIT/RESET IPI vector directly to the boot code
and skip the STARTUP IPI.  This seems to cause my mahine to miss the 2nd
CPU.  Haven't sent this to Russel yet as I have been making all my changes work
on my machine b4 trying on the XXPRESS.

Question:

isn't the STARTUP IPI redundant if the code in the INIT/RESET IPI vectors
thru warmstart to the boot code?

--
Steve Passe	| powered by
smp@csn.net	|            FreeBSD

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: 2.6.2

mQCNAzHe7tEAAAEEAM274wAEEdP+grIrV6UtBt54FB5ufifFRA5ujzflrvlF8aoE
04it5BsUPFi3jJLfvOQeydbegexspPXL6kUejYt2OeptHuroIVW5+y2M2naTwqtX
WVGeBP6s2q/fPPAS+g+sNZCpVBTbuinKa/C4Q6HJ++M9AyzIq5EuvO0a8Rr9AAUR
tBlTdGV2ZSBQYXNzZSA8c21wQGNzbi5uZXQ+
=ds99
-----END PGP PUBLIC KEY BLOCK-----