sys/arch/powerpc/include/cpu_counter.h

   1 /*      $NetBSD: cpu_counter.h,v 1.5 2007/10/17 19:56:40 garbled Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2000 Tsubai Masanari.  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  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef _POWERPC_CPU_COUNTER_H_
  30 #define _POWERPC_CPU_COUNTER_H_
  31
  32 /*
  33  * Machine-specific support for CPU counter.
  34  */
  35
  36 #ifdef _KERNEL
  37
  38 #include <powerpc/spr.h>
  39
  40 #define cpu_hascounter()        (1)
  41 #define cpu_counter()           cpu_counter32()
  42
  43 static __inline uint32_t
  44 cpu_counter32(void)
  45 {
  46         uint32_t rv, rtcu, scratch;
  47
  48         __asm volatile (
  49 #ifdef PPC_OEA601
  50             "mfpvr      %0              \n"
  51             "srwi       %0,%0,16        \n"
  52             "cmpwi      %0,%3           \n"
  53             "bne        1f              \n"     /* branch if not 601 */
  54             "lis        %0,0x77         \n"
  55             "ori        %0,%0,0x3594    \n"     /* 7.8125e6 */
  56             "mfspr      %2,%4           \n"
  57             "mullw      %2,%2,%0        \n"
  58             "mfspr      %0,%5           \n"
  59             "srwi       %0,%0,7         \n"
  60             "add        %1,%2,%0        \n"
  61             "b          2f              \n"
  62             "1:                         \n"
  63 #endif /* PPC_OEA601 */
  64 #ifdef PPC_IBM403
  65             "mftblo     %1              \n"
  66 #else
  67             "mftb       %1              \n"
  68 #endif
  69             "2:                         \n"
  70             : "=r"(scratch), "=r"(rv), "=r"(rtcu)
  71             : "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R));
  72
  73         return rv;
  74 }
  75
  76 extern uint32_t ticks_per_sec;
  77
  78 static __inline uint64_t
  79 cpu_frequency(struct cpu_info *ci)
  80 {
  81         /* XXX this probably only works on 603 and newer */
  82         return ticks_per_sec;
  83 }
  84
  85 #endif /* _KERNEL */
  86
  87 #endif /* _POWERPC_CPU_COUNTER_H_ */