1 /* $NetBSD: fpu_machdep.c,v 1.3 2013/09/07 15:56:11 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Gordon W. Ross.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Floating Point Unit (MC68881/882) initialization.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: fpu_machdep.c,v 1.3 2013/09/07 15:56:11 tsutsui Exp $");
38
39 #include "opt_fpu_emulate.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43
44 #include <machine/cpu.h>
45 #include <machine/frame.h>
46
47 #include <sun3/sun3/machdep.h>
48
49 static const char *fpu_descr[] = {
50 #ifdef FPU_EMULATE
51 "emulator", /* 0 */
52 #else
53 "no math support", /* 0 */
54 #endif
55 "mc68881", /* 1 */
56 "mc68882", /* 2 */
57 "mc68040 internal", /* 3 */
58 "mc68060 internal", /* 4 */
59 "unknown type" }; /* 5 */
60
61 void
initfpu(void)62 initfpu(void)
63 {
64 const char *descr;
65 int maxtype = sizeof(fpu_descr) / sizeof(fpu_descr[0]) - 1;
66
67 /* Set the FPU bit in the "system enable register" */
68 enable_fpu(1);
69
70 fputype = fpu_probe();
71 if (fputype < 0 || fputype > maxtype)
72 fputype = FPU_UNKNOWN;
73
74 descr = fpu_descr[fputype];
75
76 printf("fpu: %s\n", descr);
77
78 if (fputype == FPU_NONE) {
79 /* Might as well turn the enable bit back off. */
80 enable_fpu(0);
81 } else
82 m68k_make_fpu_idle_frame();
83 }
84