include/asm-ppc64/timex.h

   1 /*
   2  * linux/include/asm-ppc/timex.h
   3  *
   4  * PPC64 architecture timex specifications
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #ifndef _ASMPPC64_TIMEX_H
  12 #define _ASMPPC64_TIMEX_H
  13
  14 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
  15 #define CLOCK_TICK_FACTOR       20      /* Factor of both 1000000 and CLOCK_TICK_RATE */
  16 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
  17         (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
  18                 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
  19
  20 typedef unsigned long cycles_t;
  21
  22 static inline cycles_t get_cycles(void)
  23 {
  24         cycles_t ret;
  25
  26         __asm__ __volatile__("mftb %0" : "=r" (ret) : );
  27         return ret;
  28 }
  29
  30 #endif