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