include/asm-x86_64/timex.h

   1 /*
   2  * linux/include/asm-x86_64/timex.h
   3  *
   4  * x86-64 architecture timex specifications
   5  */
   6 #ifndef _ASMx8664_TIMEX_H
   7 #define _ASMx8664_TIMEX_H
   8
   9 #include <linux/config.h>
  10 #include <asm/8253pit.h>
  11 #include <asm/msr.h>
  12 #include <asm/vsyscall.h>
  13 #include <asm/hpet.h>
  14
  15 #define CLOCK_TICK_RATE PIT_TICK_RATE   /* Underlying HZ */
  16 #define CLOCK_TICK_FACTOR       20      /* Factor of both 1000000 and CLOCK_TICK_RATE */
  17 #define FINETUNE ((((((int)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
  18         (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
  19                 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
  20
  21 typedef unsigned long long cycles_t;
  22
  23 extern cycles_t cacheflush_time;
  24
  25 static inline cycles_t get_cycles (void)
  26 {
  27         unsigned long long ret;
  28
  29         rdtscll(ret);
  30         return ret;
  31 }
  32
  33 extern unsigned int cpu_khz;
  34
  35 extern struct vxtime_data vxtime;
  36
  37 #endif