Removed, cleaning up (no-)FPU support.
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fredette
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cddc4b4264
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/* $NetBSD: fpu.c,v 1.2 2001/04/10 12:27:40 fredette Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Floating Point Unit (MC68881/882)
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* Probe for the FPU at autoconfig time.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <sun2/sun2/machdep.h>
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static int fpu_probe __P((void));
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static char *fpu_descr[] = {
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#ifdef FPU_EMULATE
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"emulator", /* 0 */
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#else
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"no math support", /* 0 */
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#endif
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"mc68881", /* 1 */
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"mc68882", /* 2 */
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"mc68040 internal", /* 3 */
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"mc68060 internal", /* 4 */
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"unknown type" }; /* 5 */
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void
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initfpu()
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{
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char *descr;
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int maxtype = sizeof(fpu_descr) / sizeof(fpu_descr[0]) - 1;
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#ifdef notyet
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/* Set the FPU bit in the "system enable register" */
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enable_fpu(1);
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#endif
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fputype = fpu_probe();
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if (fputype < 0 || fputype > maxtype)
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fputype = FPU_UNKNOWN;
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descr = fpu_descr[fputype];
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printf("fpu: %s\n", descr);
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if (fputype == FPU_NONE) {
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#ifdef notyet
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/* Might as well turn the enable bit back off. */
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enable_fpu(0);
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#endif
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}
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}
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static int
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fpu_probe()
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{
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#ifdef notyet
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label_t faultbuf;
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struct fpframe fpframe;
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u_char b;
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nofault = &faultbuf;
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if (setjmp(&faultbuf)) {
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nofault = NULL;
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return FPU_NONE;
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}
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/*
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* Synchronize FPU or cause a fault.
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* This should leave the 881/882 in the IDLE state,
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* so we can determine which we have by
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* examining the size of the FP state frame.
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*/
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asm("fnop");
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nofault = NULL;
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/* Presumably, this will not cause a fault--the fnop should
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* have if this will. We save the state in order to get the
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* size of the frame.
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*/
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asm("fsave %0@" : : "a" (&fpframe) : "memory");
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b = fpframe.fpf_fsize;
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/*
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* Now, restore a NULL state to reset the FPU.
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*/
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fpframe.fpf_null = 0;
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fpframe.fpf_idle.fpf_ccr = 0;
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m68881_restore(&fpframe);
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/*
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* The size of a 68881 IDLE frame is 0x18
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* and 68882 frame is 0x38
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*/
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if (b == 0x18)
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return FPU_68881;
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if (b == 0x38)
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return FPU_68882;
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/*
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* If it's not one of the above, we have no clue what it is.
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*/
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return FPU_UNKNOWN;
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#endif
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return FPU_NONE;
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}
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