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      1 /*	$NetBSD: cpu_counter.h,v 1.7 2020/06/15 09:09:23 msaitoh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000, 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Bill Sommerfeld.
      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 #ifndef _X86_CPU_COUNTER_H_
     33 #define _X86_CPU_COUNTER_H_
     34 
     35 #ifdef _KERNEL
     36 
     37 #include <sys/lwp.h>
     38 
     39 extern uint64_t	cpu_frequency(struct cpu_info *);
     40 extern int	cpu_hascounter(void);
     41 extern uint64_t	(*cpu_counter)(void);
     42 extern uint32_t	(*cpu_counter32)(void);
     43 
     44 extern uint64_t	cpu_counter_cpuid(void);
     45 extern uint64_t	cpu_counter_lfence(void);
     46 extern uint64_t	cpu_counter_mfence(void);
     47 extern uint32_t	cpu_counter32_cpuid(void);
     48 extern uint32_t	cpu_counter32_lfence(void);
     49 extern uint32_t	cpu_counter32_mfence(void);
     50 
     51 #endif	/* _KERNEL */
     52 
     53 #endif /* !_X86_CPU_COUNTER_H_ */
     54