1/*	$NetBSD$	*/
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");
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
49static 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
61void
62initfpu(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