From owner-p4-projects@FreeBSD.ORG  Fri Mar 31 16:55:42 2006
Return-Path: <owner-p4-projects@FreeBSD.ORG>
X-Original-To: p4-projects@freebsd.org
Delivered-To: p4-projects@freebsd.org
Received: by hub.freebsd.org (Postfix, from userid 32767)
	id 3240C16A420; Fri, 31 Mar 2006 16:55:42 +0000 (UTC)
X-Original-To: perforce@freebsd.org
Delivered-To: perforce@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id CA32916A400
	for <perforce@freebsd.org>; Fri, 31 Mar 2006 16:55:41 +0000 (UTC)
	(envelope-from jhb@freebsd.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 94ED643D46
	for <perforce@freebsd.org>; Fri, 31 Mar 2006 16:55:41 +0000 (GMT)
	(envelope-from jhb@freebsd.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id k2VGtcIf096252
	for <perforce@freebsd.org>; Fri, 31 Mar 2006 16:55:41 GMT
	(envelope-from jhb@freebsd.org)
Received: (from perforce@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id k2VGtc7P096244
	for perforce@freebsd.org; Fri, 31 Mar 2006 16:55:38 GMT
	(envelope-from jhb@freebsd.org)
Date: Fri, 31 Mar 2006 16:55:38 GMT
Message-Id: <200603311655.k2VGtc7P096244@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: perforce set sender to
	jhb@freebsd.org using -f
From: John Baldwin <jhb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Cc: 
Subject: PERFORCE change 94357 for review
X-BeenThere: p4-projects@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: p4 projects tree changes <p4-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/p4-projects>
List-Post: <mailto:p4-projects@freebsd.org>
List-Help: <mailto:p4-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 31 Mar 2006 16:55:42 -0000

http://perforce.freebsd.org/chv.cgi?CH=94357

Change 94357 by jhb@jhb_slimer on 2006/03/31 16:54:47

	Fixup comments.

Affected files ...

.. //depot/projects/smpng/sys/i386/isa/npx.c#53 edit

Differences ...

==== //depot/projects/smpng/sys/i386/isa/npx.c#53 (text+ko) ====

@@ -236,7 +236,7 @@
 /*
  * Probe routine.  Initialize cr0 to give correct behaviour for [f]wait
  * whether the device exists or not (XXX should be elsewhere).  Set flags
- * to tell npxattach() what to do.  Modify device struct if npx doesn't
+ * to tell npxattach() what to do.  Setup an interrupt handler if npx does
  * need to use interrupts.  Return 0 if device exists.
  */
 static int
@@ -252,11 +252,18 @@
 
 	KASSERT((rcr0() & (CR0_MP | CR0_NE)) == (CR0_MP | CR0_NE),
 	    ("cr0 busted"));
+
+	/*
+	 * Modern CPUs all have an FPU that uses the INT16 interface
+	 * and provide a simple way to verify that, so handle the
+	 * common case right away.
+	 */
 	if (cpu_feature & CPUID_FPU) {
 		hw_float = npx_exists = 1;
 		npx_ex16 = 1;
 		return (0);
 	}
+
 	save_idt_npxtrap = idt[IDT_MF];
 	setidt(IDT_MF, probetrap, SDT_SYS386TGT, SEL_KPL,
 	    GSEL(GCODE_SEL, SEL_KPL));