/*      $NetBSD: cpu_counter.h,v 1.6 2020/07/26 08:08:41 simonb Exp $   */

/*
* Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef _MIPS_CPU_COUNTER_H_
#define _MIPS_CPU_COUNTER_H_

/*
* Machine-specific support for CPU counter.
*/

#ifdef _KERNEL
#if __mips < 3
#include <mips/locore.h>
#endif

static __inline int
cpu_hascounter(void)
{
       /*
        * MIPS III and MIPS IV CPU's have a cycle counter
        * running at half the internal pipeline rate.
        */
#if __mips >= 3
       return 1;
#elif !defined(__mips_o32) || defined(MIPS3_PLUS)
       return (MIPS_HAS_CLOCK);
#else
       return 0;
#endif
}

#if __mips >= 3 || !defined(__mips_o32) || defined(MIPS3_PLUS)
#define cpu_counter()           cpu_counter32()

uint32_t cpu_counter32(void);   /* weak alias of mips3_cp0_count_read */
#else
#define cpu_counter()           (0)
#define cpu_counter32()         (0)
#endif

static __inline uint64_t
cpu_frequency(struct cpu_info *ci)
{
       return ci->ci_cctr_freq;
}

#endif /* _KERNEL */
#endif /* !_MIPS_CPU_COUNTER_H_ */