1219019Sgabor/*
2219019Sgabor * Copyright 2000  Brian S. Dean <bsd@bsdhome.com>
3219019Sgabor * All Rights Reserved.
4219019Sgabor *
5219019Sgabor * Redistribution and use in source and binary forms, with or without
6219019Sgabor * modification, are permitted provided that the following conditions
7219019Sgabor * are met:
8219019Sgabor *
9219019Sgabor * 1. Redistributions of source code must retain the above copyright
10219019Sgabor *    notice, this list of conditions and the following disclaimer.
11219019Sgabor * 2. Redistributions in binary form must reproduce the above copyright
12219019Sgabor *    notice, this list of conditions and the following disclaimer in the
13219019Sgabor *    documentation and/or other materials provided with the distribution.
14219019Sgabor *
15219019Sgabor * THIS SOFTWARE IS PROVIDED BY BRIAN S. DEAN ``AS IS'' AND ANY
16219019Sgabor * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17219019Sgabor * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18219019Sgabor * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL BRIAN S. DEAN BE LIABLE
19219019Sgabor * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
23 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
25 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26 * DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: releng/11.0/lib/libc/i386/sys/i386_clr_watch.c 105604 2002-10-21 03:47:22Z sam $");
31
32#include <machine/reg.h>
33#include <machine/sysarch.h>
34
35int
36i386_clr_watch(int watchnum, struct dbreg * d)
37{
38
39	if (watchnum < 0 || watchnum >= 4)
40		return -1;
41
42	DBREG_DRX(d,7) = DBREG_DRX(d,7) & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
43        DBREG_DRX(d,watchnum) = 0;
44
45	return 0;
46}
47