bootblock/boot/bzero.s

1.3  is /*      $NetBSD: bzero.s,v 1.3 1999/02/16 23:34:11 is Exp $ */
1.2  is
1.2  is /*-
1.3  is  * Copyright (c) 1997 The NetBSD Foundation, Inc.
1.2  is  * All rights reserved.
1.1  is  *
1.2  is  * This code is derived from software contributed to The NetBSD Foundation
1.2  is  * by Ignatios Souvatzis.
1.1  is  *
1.1  is  * Redistribution and use in source and binary forms, with or without
1.1  is  * modification, are permitted provided that the following conditions
1.1  is  * are met:
1.1  is  * 1. Redistributions of source code must retain the above copyright
1.1  is  *    notice, this list of conditions and the following disclaimer.
1.1  is  * 2. Redistributions in binary form must reproduce the above copyright
1.1  is  *    notice, this list of conditions and the following disclaimer in the
1.1  is  *    documentation and/or other materials provided with the distribution.
1.1  is  * 3. All advertising materials mentioning features or use of this software
1.1  is  *    must display the following acknowledgement:
1.2  is  *        This product includes software developed by the NetBSD
1.2  is  *        Foundation, Inc. and its contributors.
1.2  is  * 4. Neither the name of The NetBSD Foundation nor the names of its
1.2  is  *    contributors may be used to endorse or promote products derived
1.2  is  *    from this software without specific prior written permission.
1.1  is  *
1.2  is  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
1.2  is  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.2  is  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.2  is  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
1.2  is  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.2  is  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.2  is  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.2  is  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.2  is  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.2  is  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.2  is  * POSSIBILITY OF SUCH DAMAGE.
1.2  is  */
1.2  is
1.2  is /*
1.1  is  * Lightweight bzero.
1.1  is  */
1.1  is
1.1  is 	.text
1.1  is 	.even
1.1  is 	.globl _bzero
1.1  is _bzero:
1.1  is 	movel sp@(4),a0
1.1  is 	movel sp@(8),d0
1.1  is 	jeq L3
1.1  is L4:
1.1  is 	clrb a0@+
1.1  is 	subql #1,d0
1.1  is 	jne L4
1.1  is L3:
1.1  is 	rts