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      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 
     40 static __inline int
     41 cpu_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 
     59 uint32_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 
     65 static __inline uint64_t
     66 cpu_frequency(struct cpu_info *ci)
     67 {
     68 	return ci->ci_cctr_freq;
     69 }
     70 
     71 #endif /* _KERNEL */
     72 #endif /* !_MIPS_CPU_COUNTER_H_ */
     73