1/* $NetBSD: cpu_counter.h,v 1.6 2020/07/26 08:08:41 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#ifndef _MIPS_CPU_COUNTER_H_ 29#define _MIPS_CPU_COUNTER_H_ 30 31/* 32 * Machine-specific support for CPU counter. 33 */ 34 35#ifdef _KERNEL 36#if __mips < 3 37#include <mips/locore.h> 38#endif 39 40static __inline int 41cpu_hascounter(void) 42{ 43 /* 44 * MIPS III and MIPS IV CPU's have a cycle counter 45 * running at half the internal pipeline rate. 46 */ 47#if __mips >= 3 48 return 1; 49#elif !defined(__mips_o32) || defined(MIPS3_PLUS) 50 return (MIPS_HAS_CLOCK); 51#else 52 return 0; 53#endif 54} 55 56#if __mips >= 3 || !defined(__mips_o32) || defined(MIPS3_PLUS) 57#define cpu_counter() cpu_counter32() 58 59uint32_t cpu_counter32(void); /* weak alias of mips3_cp0_count_read */ 60#else 61#define cpu_counter() (0) 62#define cpu_counter32() (0) 63#endif 64 65static __inline uint64_t 66cpu_frequency(struct cpu_info *ci) 67{ 68 return ci->ci_cctr_freq; 69} 70 71#endif /* _KERNEL */ 72#endif /* !_MIPS_CPU_COUNTER_H_ */ 73