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 <asm/8253pit.h>
  10 #include <asm/msr.h>
  11 #include <asm/vsyscall.h>
  12 #include <asm/system.h>
  13 #include <asm/processor.h>
  14 #include <asm/tsc.h>
  15 #include <linux/compiler.h>
  16
  17 #define CLOCK_TICK_RATE PIT_TICK_RATE   /* Underlying HZ */
  18
  19 extern int read_current_timer(unsigned long *timer_value);
  20 #define ARCH_HAS_READ_CURRENT_TIMER     1
  21
  22 #define USEC_PER_TICK (USEC_PER_SEC / HZ)
  23 #define NSEC_PER_TICK (NSEC_PER_SEC / HZ)
  24 #define FSEC_PER_TICK (FSEC_PER_SEC / HZ)
  25
  26 #define NS_SCALE        10 /* 2^10, carefully chosen */
  27 #define US_SCALE        32 /* 2^32, arbitralrily chosen */
  28
  29 extern void mark_tsc_unstable(char *msg);
  30 extern void set_cyc2ns_scale(unsigned long khz);
  31 #endif