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