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      1 /*	$NetBSD: cpu_counter.h,v 1.3 2022/10/15 06:46:41 simonb Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions, and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /* $NetBSD: cpu_counter.h,v 1.3 2022/10/15 06:46:41 simonb Exp $ */
     29 /*-
     30  * Copyright (c) 2014 The NetBSD Foundation, Inc.
     31  * All rights reserved.
     32  *
     33  * This code is derived from software contributed to The NetBSD Foundation
     34  * by Matt Thomas of 3am Software Foundry.
     35  *
     36  * Redistribution and use in source and binary forms, with or without
     37  * modification, are permitted provided that the following conditions
     38  * are met:
     39  * 1. Redistributions of source code must retain the above copyright
     40  *    notice, this list of conditions and the following disclaimer.
     41  * 2. Redistributions in binary form must reproduce the above copyright
     42  *    notice, this list of conditions and the following disclaimer in the
     43  *    documentation and/or other materials provided with the distribution.
     44  *
     45  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     46  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     47  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     48  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     49  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     50  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     51  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     52  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     53  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     54  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     55  * POSSIBILITY OF SUCH DAMAGE.
     56  */
     57 
     58 #ifndef _RISCV_CPU_COUNTER_H_
     59 #define	_RISCV_CPU_COUNTER_H_
     60 
     61 /*
     62  * Machine-specific support for CPU counter.
     63  */
     64 
     65 #include <machine/cpu.h>
     66 
     67 #ifdef _KERNEL
     68 
     69 #define	cpu_hascounter()	true
     70 
     71 #ifdef _LP64
     72 static __inline uint64_t
     73 cpu_counter(void)
     74 {
     75 	uint64_t __count;
     76 
     77 	__asm __volatile("csrr\t%0, cycle" : "=r"(__count));
     78 	return __count;
     79 }
     80 
     81 
     82 #else /* 32-bit */
     83 #define	cpu_counter()		cpu_counter32()
     84 #endif /* 32-bit */
     85 
     86 static __inline uint32_t
     87 cpu_counter32(void)
     88 {
     89 	uint32_t __count;
     90 
     91 	__asm __volatile("csrr\t%0, cycle" : "=r"(__count));
     92 	return __count;
     93 }
     94 
     95 static __inline uint64_t
     96 cpu_frequency(const struct cpu_info *ci)
     97 {
     98 	return ci->ci_data.cpu_cc_freq;
     99 }
    100 
    101 #endif /* _KERNEL */
    102 
    103 #endif /* !_RISCV_CPU_COUNTER_H_ */
    104