1 /* $NetBSD: fpsetsticky.c,v 1.1 1995/04/29 05:11:04 cgd Exp $ */
2 /* $FreeBSD: src/lib/libc/alpha/gen/fpsetsticky.c,v 1.2.6.1 2000/08/17 08:08:15 jhb Exp $ */
5 * Copyright (c) 1995 Christopher G. Demetriou
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Christopher G. Demetriou
19 * for the NetBSD Project.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <sys/types.h>
37 #include <machine/fpu.h>
47 old = *(u_int64_t *)&fpcrval;
48 new = old & ~ (IEEE_STATUS_MASK << IEEE_STATUS_TO_FPCR_SHIFT);
49 new |= ((sticky << IEEE_STATUS_TO_EXCSUM_SHIFT) & IEEE_STATUS_MASK)
50 << IEEE_STATUS_TO_FPCR_SHIFT;
51 *(u_int64_t *)&fpcrval = new;
54 return (((old >> IEEE_STATUS_TO_FPCR_SHIFT) & IEEE_STATUS_MASK)
55 >> IEEE_STATUS_TO_EXCSUM_SHIFT);