From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270969AbTGVRqO (ORCPT ); Tue, 22 Jul 2003 13:46:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270981AbTGVRqO (ORCPT ); Tue, 22 Jul 2003 13:46:14 -0400 Received: from x35.xmailserver.org ([208.129.208.51]:57513 "EHLO x35.xmailserver.org") by vger.kernel.org with ESMTP id S270969AbTGVRp6 (ORCPT ); Tue, 22 Jul 2003 13:45:58 -0400 X-AuthUser: davidel@xmailserver.org Date: Tue, 22 Jul 2003 10:54:02 -0700 (PDT) From: Davide Libenzi X-X-Sender: davide@bigblue.dev.mcafeelabs.com To: "Richard B. Johnson" cc: Jamie Lokier , "Randy.Dunlap" , lkml Subject: Re: asm (lidt) question In-Reply-To: Message-ID: References: <20030717152819.66cfdbaf.rddunlap@osdl.org> <20030722172722.GC3267@mail.jlokier.co.uk> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 22 Jul 2003, Richard B. Johnson wrote: > LIDT is "load interrupt descriptor table". SIDT is "store interrupt > descriptor table". Only SIDT modifies memory. LIDT reads from memory > and puts the result into a special CPU register, therefore doesn't > modify memory. Indeed, that why this is not really correct : __asm__ __volatile__("lidt %0": "=m" (var)); even if it generates the same code of : __asm__ __volatile__("lidt %0": : "m" (var)); - Davide