sys/arch/mips/include/cpu_counter.h

   1 /*      $NetBSD: cpu_counter.h,v 1.2 2005/12/24 20:07:19 perry 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 #include <machine/cpu.h>
  36 #include <mips/locore.h>
  37
  38 #ifdef _KERNEL
  39
  40 #ifdef MIPS3_PLUS
  41 static __inline int
  42 cpu_hascounter(void)
  43 {
  44
  45         /*
  46          * MIPS III and MIPS IV CPU's have a cycle counter
  47          * running at half the internal pipeline rate.
  48          */
  49         return (MIPS_HAS_CLOCK);
  50 }
  51
  52 #define cpu_counter()           cpu_counter32()
  53
  54 static __inline uint32_t
  55 cpu_counter32(void)
  56 {
  57
  58         return mips3_cp0_count_read();
  59 }
  60
  61 #if 0   /* XXX MI microtime() needs frequency of CPU counter. */
  62 static __inline uint64_t
  63 cpu_frequency(struct cpu_info *ci)
  64 {
  65 }
  66 #endif
  67 #endif
  68
  69 #endif /* _KERNEL */
  70 #endif /* !_MIPS_CPU_COUNTER_H_ */