79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* $NetBSD: rnd.h,v 1.3 2000/07/02 21:05:14 sommerfeld Exp $ */
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/*-
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* Copyright (c) 2000 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 Bill Sommerfeld.
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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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#ifndef _I386_RND_H_
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#define _I386_RND_H_
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/*
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* Machine-specific support for rnd(4)
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*/
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#include <machine/cpufunc.h>
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#include <machine/specialreg.h>
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#include "opt_cputype.h"
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#ifdef _KERNEL
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static __inline int
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cpu_hascounter(void)
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{
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#if I586_CPU || I686_CPU
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/*
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* Note that:
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* 1) Intel documentation is very specific that code *must* test
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* the CPU feature flag, even if you "know" that a particular
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* rev of the hardware supports it.
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* 2) We know that the TSC is busted on some Cyrix CPU's..
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*/
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return (cpu_feature & CPUID_TSC) != 0;
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#else
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return 0;
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#endif
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}
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static __inline u_int64_t
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cpu_counter(void)
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{
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return rdtsc();
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}
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#endif /* _KERNEL */
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#endif /* !_I386_RND_H_ */
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