1 /* $OpenBSD: fpc_csr.c,v 1.1 2010/09/24 13:54:06 miod Exp $ */
2
3 /*
4 * Copyright (c) 2010 Miodrag Vallat.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * IRIX-compatible get_fpc_csr() and set_fpc_csr() functions
21 */
22
23 #include <sys/types.h>
24 #include <machine/fpu.h>
25
26 int
get_fpc_csr()27 get_fpc_csr()
28 {
29 int32_t csr;
30
31 __asm__("cfc1 %0,$31" : "=r" (csr));
32 return csr;
33 }
34
35 int
set_fpc_csr(int csr)36 set_fpc_csr(int csr)
37 {
38 int32_t oldcsr;
39
40 __asm__("cfc1 %0,$31" : "=r" (oldcsr));
41 __asm__("ctc1 %0,$31" :: "r" (csr));
42
43 return oldcsr;
44 }
45