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      1 /*	$NetBSD: fpu_machdep.c,v 1.2 2022/07/02 08:35:49 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 (MC68881/882/040) initialization.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: fpu_machdep.c,v 1.2 2022/07/02 08:35:49 tsutsui Exp $");
     38 
     39 #include "opt_fpu_emulate.h"
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/time.h>
     44 #include <sys/kernel.h>
     45 #include <sys/device.h>
     46 
     47 #include <machine/psl.h>
     48 #include <machine/cpu.h>
     49 #include <machine/frame.h>
     50 
     51 extern int fpu_type;
     52 extern int *nofault;
     53 
     54 static const char *fpu_descr[] = {
     55 #ifdef	FPU_EMULATE
     56 	[FPU_NONE] = " emulated ",
     57 #else
     58 	[FPU_NONE] = " no ",
     59 #endif
     60 	[FPU_68881] = " MC68881 ",
     61 	[FPU_68882] = " MC68882 ",
     62 	[FPU_68040] = "/",
     63 	[FPU_68060] = "/",
     64 	[FPU_UNKNOWN] = "??? "
     65 };
     66 
     67 const char *
     68 fpu_describe(int type)
     69 {
     70 	int	maxtype = sizeof(fpu_descr)/sizeof(fpu_descr[0]) - 1;
     71 
     72 	if ((type < 0) || (type > maxtype))
     73 		type = 0;
     74 	return fpu_descr[type];
     75 }
     76