sys/arch/arm/include/cpu_counter.h

   1 /*      $NetBSD: cpu_counter.h,v 1.2 2012/08/29 18:45:40 matt Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2012 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 _ARM_CPU_COUNTER_H_
  33 #define _ARM_CPU_COUNTER_H_
  34
  35 /*
  36  * ARM specific support for CPU counter (ARM11 and Cortex only).
  37  * If __HAVE_CPU_COUNTER is defined for any other CPU_*, it will crash.
  38  */
  39
  40 #ifdef _KERNEL
  41
  42 #include <sys/cpu.h>
  43
  44 #if defined(CPU_CORTEX) || defined(CPU_ARM11)
  45 #define cpu_hascounter()        (curcpu()->ci_data.cpu_cc_freq != 0)
  46 #else
  47 #define cpu_hascounter()        false
  48 #endif
  49
  50 #define cpu_counter()           cpu_counter32()
  51
  52 #if defined(CPU_CORTEX) || defined(CPU_ARM11)
  53 static __inline uint32_t
  54 cpu_counter32(void)
  55 {
  56 #if defined(CPU_CORTEX) && defined(CPU_ARM11)
  57         const bool cortex_p = CPU_ID_CORTEX_P(curcpu()->ci_cpu_id);
  58 #elif defined(CPU_CORTEX)
  59         const bool cortex_p = true;
  60 #elif defined(CPU_ARM11)
  61         const bool cortex_p = false;
  62 #endif
  63
  64         if (cortex_p)
  65                 return armreg_pmccntr_read();
  66         else
  67                 return armreg_pmccntrv6_read();
  68 }
  69 #endif
  70
  71 static __inline uint64_t
  72 cpu_frequency(struct cpu_info *ci)
  73 {
  74         return ci->ci_data.cpu_cc_freq;
  75 }
  76
  77 #endif /* _KERNEL */
  78
  79 #endif /* _ARM_CPU_COUNTER_H_ */