include/asm-s390/timex.h

   1 /*
   2  *  include/asm-s390/timex.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *
   7  *  Derived from "include/asm-i386/timex.h"
   8  *    Copyright (C) 1992, Linus Torvalds
   9  */
  10
  11 #ifndef _ASM_S390_TIMEX_H
  12 #define _ASM_S390_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 long cycles_t;
  21
  22 extern cycles_t cacheflush_time;
  23
  24 static inline cycles_t get_cycles(void)
  25 {
  26         cycles_t cycles;
  27
  28         __asm__("stck 0(%1)" : "=m" (cycles) : "a" (&cycles) : "cc");
  29         return cycles >> 2;
  30 }
  31
  32 static inline unsigned long long get_clock (void)
  33 {
  34         unsigned long long clk;
  35
  36         __asm__("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
  37         return clk;
  38 }
  39
  40 #endif