From owner-freebsd-ia32@FreeBSD.ORG  Tue Sep  5 18:49:21 2006
Return-Path: <owner-freebsd-ia32@FreeBSD.ORG>
X-Original-To: freebsd-ia32@freebsd.org
Delivered-To: freebsd-ia32@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 1E95716A501
	for <freebsd-ia32@freebsd.org>; Tue,  5 Sep 2006 18:49:21 +0000 (UTC)
	(envelope-from jhb@freebsd.org)
Received: from server.baldwin.cx (66-23-211-162.clients.speedfactory.net
	[66.23.211.162])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DC3A143D5D
	for <freebsd-ia32@freebsd.org>; Tue,  5 Sep 2006 18:49:11 +0000 (GMT)
	(envelope-from jhb@freebsd.org)
Received: from localhost.corp.yahoo.com (john@localhost [127.0.0.1])
	(authenticated bits=0)
	by server.baldwin.cx (8.13.6/8.13.6) with ESMTP id k85ImtIi069407;
	Tue, 5 Sep 2006 14:49:09 -0400 (EDT) (envelope-from jhb@freebsd.org)
From: John Baldwin <jhb@freebsd.org>
To: freebsd-ia32@freebsd.org
Date: Tue, 5 Sep 2006 14:46:35 -0400
User-Agent: KMail/1.9.1
References: <29683db20609012326i351eb455ja3b0aade681c7773@mail.gmail.com>
In-Reply-To: <29683db20609012326i351eb455ja3b0aade681c7773@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200609051446.36261.jhb@freebsd.org>
X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by
	milter-greylist-2.0.2 (server.baldwin.cx [127.0.0.1]);
	Tue, 05 Sep 2006 14:49:10 -0400 (EDT)
X-Virus-Scanned: ClamAV 0.88.3/1806/Tue Sep 5 11:00:48 2006 on
	server.baldwin.cx
X-Virus-Status: Clean
X-Spam-Status: No, score=-4.4 required=4.2 tests=ALL_TRUSTED,AWL,BAYES_00 
	autolearn=ham version=3.1.3
X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx
Cc: Bharath Bhushan <bharath.bhushan@gmail.com>
Subject: Re: io apic question
X-BeenThere: freebsd-ia32@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: FreeBSD on the IA-32 platform <freebsd-ia32.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ia32>,
	<mailto:freebsd-ia32-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ia32>
List-Post: <mailto:freebsd-ia32@freebsd.org>
List-Help: <mailto:freebsd-ia32-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ia32>,
	<mailto:freebsd-ia32-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 05 Sep 2006 18:49:21 -0000

On Saturday 02 September 2006 02:26, Bharath Bhushan wrote:
> I am looking at 4.9 sources.
> 
> When the local apic is mapped into SMPpt in
> sys/i386/i386/pmap.c:pmap_bootstrap(), it is mapped cache-disabled
> (PG_N).
> 
> When the IO apics are being mapped into SMPpt in
> sys/i386/i386/mp_machdep.c:mptable_pass2(), it is *not* mapped
> cache-disabled.
> 
> Why is this difference?

Probably a bug.

> In 5.5, I see that ioapic_create() calls pmap_createdev(), which
> allocates cache-enabled kind of mapping.
> 
> Am I missing something here?

In 7.0 we map them cache-disabled now.

-- 
John Baldwin