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
  16 typedef unsigned long long cycles_t;
  17
  18 static inline unsigned long long get_clock (void)
  19 {
  20         unsigned long long clk;
  21
  22 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
  23         asm volatile("stck %0" : "=Q" (clk) : : "cc");
  24 #else /* __GNUC__ */
  25         asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
  26 #endif /* __GNUC__ */
  27         return clk;
  28 }
  29
  30 static inline cycles_t get_cycles(void)
  31 {
  32         return (cycles_t) get_clock() >> 2;
  33 }
  34
  35 #endif