From owner-cvs-src@FreeBSD.ORG  Tue Mar 18 08:39:12 2008
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 660A61065673;
	Tue, 18 Mar 2008 08:39:12 +0000 (UTC)
	(envelope-from adrian@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id 368368FC17;
	Tue, 18 Mar 2008 08:39:12 +0000 (UTC)
	(envelope-from adrian@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.1/8.14.1) with ESMTP id m2I8dCxF073281;
	Tue, 18 Mar 2008 08:39:12 GMT
	(envelope-from adrian@repoman.freebsd.org)
Received: (from adrian@localhost)
	by repoman.freebsd.org (8.14.1/8.14.1/Submit) id m2I8dCgH073280;
	Tue, 18 Mar 2008 08:39:12 GMT (envelope-from adrian)
Message-Id: <200803180839.m2I8dCgH073280@repoman.freebsd.org>
From: Adrian Chadd <adrian@FreeBSD.org>
Date: Tue, 18 Mar 2008 08:39:12 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/sys/dev/hwpmc hwpmc_amd.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 18 Mar 2008 08:39:12 -0000

adrian      2008-03-18 08:39:12 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/hwpmc        hwpmc_amd.c 
  Log:
  Sign-extend the 48-bit AMD PMC counter before treating it to a 64-bit
  2's compliment.
  
  The 2's compliment transform is done so a "count down" sampling interval
  can be converted into a "count up" PMC value. a 2's complimented 'count down'
  value is written to the PMC counter; then the read-back counter is reverted
  via another 2's compliment.
  
  PR: kern/121660
  Reviewed by: jkoshy
  Approved by: jkoshy
  MFC after: 1 week
  
  Revision  Changes    Path
  1.16      +8 -5      src/sys/dev/hwpmc/hwpmc_amd.c