sys/arch/alpha/include/cpu_counter.h

   1 /* $NetBSD: cpu_counter.h,v 1.5 2007/10/17 19:52:58 garbled Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe.
   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 _ALPHA_CPU_COUNTER_H_
  33 #define _ALPHA_CPU_COUNTER_H_
  34
  35 /*
  36  * Machine-specific support for CPU counter.
  37  */
  38
  39 #ifdef _KERNEL
  40
  41 #include <machine/cpu.h>
  42 #include <machine/rpb.h>
  43
  44 #define cc_calibrate_mp(ci)     \
  45         alpha_multicast_ipi(cpus_running, ALPHA_IPI_MICROSET)
  46
  47 /* Process Cycle Counter is always available. */
  48 #define cpu_hascounter()        (1)
  49 #define cpu_counter()           cpu_counter32()
  50
  51 static __inline uint32_t
  52 cpu_counter32(void)
  53 {
  54
  55         /*
  56          * Only the lower 32 bits of the PCC are an actual cycle
  57          * counter.  Thankfully, the rnd(4) code only wants a
  58          * 32-bit value anyway.
  59          */
  60         return (alpha_rpcc() & 0xffffffffU);
  61 }
  62
  63 static __inline uint64_t
  64 cpu_frequency(struct cpu_info *ci)
  65 {
  66
  67         return (ci->ci_pcc_freq);
  68 }
  69
  70 #endif /* _KERNEL */
  71
  72 #endif /* !_ALPHA_CPU_COUNTER_H_ */