From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Fri, 21 Feb 2003 12:23:22 +0000 (GMT) Received: from p508B7762.dip.t-dialin.net ([IPv6:::ffff:80.139.119.98]:9669 "EHLO dea.linux-mips.net") by linux-mips.org with ESMTP id ; Fri, 21 Feb 2003 12:23:21 +0000 Received: (from ralf@localhost) by dea.linux-mips.net (8.11.6/8.11.6) id h1LCNEZ31340; Fri, 21 Feb 2003 13:23:14 +0100 Date: Fri, 21 Feb 2003 13:23:14 +0100 From: Ralf Baechle To: "Maciej W. Rozycki" Cc: linux-mips@linux-mips.org Subject: Re: [patch] Cobalt IRQ handler CP0 interlock? Message-ID: <20030221132314.A28300@linux-mips.org> References: <20030220195314.C30853@linux-mips.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from macro@ds2.pg.gda.pl on Fri, Feb 21, 2003 at 01:11:58PM +0100 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 1509 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Fri, Feb 21, 2003 at 01:11:58PM +0100, Maciej W. Rozycki wrote: > > > Does Cobalt have a processor that implements its pipeline differently or > > > interlocks on CP0 loads? If not, I'll apply the following fix. > > > > Mfc0 doesn't need a nops on any R4000 class CPU I know of. > > Well, my MIPS R4k manual is vague on this matter and my IDT software > manual for R3k, R4k, R5k is even explicit on the load delay slot of mfc0. > But a run-time test proves otherwise. > > I stand corrected then unless someone finds a counter-example. All I can say it's working fine like this since 1984 for R4000 class CPUs. Ralf