From owner-cvs-all@FreeBSD.ORG  Thu Oct  5 15:30:51 2006
Return-Path: <owner-cvs-all@FreeBSD.ORG>
X-Original-To: cvs-all@FreeBSD.org
Delivered-To: cvs-all@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id D9BE116A587;
	Thu,  5 Oct 2006 15:30:51 +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 AABC543D46;
	Thu,  5 Oct 2006 15:30:51 +0000 (GMT) (envelope-from jhb@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.6/8.13.6) with ESMTP id k95FUpf9005487;
	Thu, 5 Oct 2006 15:30:51 GMT (envelope-from jhb@repoman.freebsd.org)
Received: (from jhb@localhost)
	by repoman.freebsd.org (8.13.6/8.13.4/Submit) id k95FUpjE005483;
	Thu, 5 Oct 2006 15:30:51 GMT (envelope-from jhb)
Message-Id: <200610051530.k95FUpjE005483@repoman.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 5 Oct 2006 15:30:51 +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/boot/i386/btx/btx btx.S
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 05 Oct 2006 15:30:52 -0000

jhb         2006-10-05 15:30:51 UTC

  FreeBSD src repository

  Modified files:
    sys/boot/i386/btx/btx btx.S 
  Log:
  - Fix a couple of improper uses of leal in the previous space saving
    commits.  For some reason I thought the scale factor was a shift count
    rather than the multiplicand (that is, I thought leal (%eax,%edx,4) was
    going to generate %eax + %edx << 4 rather than %eax + %edx * 4).  What
    I need is to multiply by 16 to convert a real-mode (seg, offset) tuple
    into a flat address.  However, the max multiplicand for scaled/index
    addressing on i386 is 8, so go back to using a shl and an add.
  - Convert two more inter-register mov instructions where we don't need to
    preserve the source register to xchg instructions to keep our space
    savings.
  
  Tested by:      Ian FREISLICH if at hetzner.co.za
  MFC after:      1 week
  
  Revision  Changes    Path
  1.43      +7 -5      src/sys/boot/i386/btx/btx/btx.S