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      1 /* $NetBSD: cpu_counter.h,v 1.2 2021/02/22 09:29:38 ryo Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 _AARCH64_CPU_COUNTER_H_
     33 #define _AARCH64_CPU_COUNTER_H_
     34 
     35 /*
     36  * AArch64 specific support for CPU counter.
     37  */
     38 
     39 #ifdef _KERNEL
     40 
     41 #ifdef __aarch64__
     42 
     43 #include <sys/cpu.h>
     44 #include <aarch64/armreg.h>
     45 
     46 #define cpu_hascounter()	(curcpu()->ci_data.cpu_cc_freq != 0)
     47 
     48 static __inline uint64_t
     49 cpu_counter(void)
     50 {
     51 	return reg_pmccntr_el0_read();
     52 }
     53 
     54 static __inline uint32_t
     55 cpu_counter32(void)
     56 {
     57 	return reg_pmccntr_el0_read();
     58 }
     59 
     60 static __inline uint64_t
     61 cpu_frequency(struct cpu_info *ci)
     62 {
     63 	return ci->ci_data.cpu_cc_freq;
     64 }
     65 
     66 #endif /* _KERNEL */
     67 
     68 #elif defined(__arm__)
     69 
     70 #include <arm/cpu_counter.h>
     71 
     72 #endif
     73 
     74 #endif /* _AARCH64_CPU_COUNTER_H_ */
     75