LXR linux/arch/powerpc/include/asm/timex.h

   1#ifndef _ASM_POWERPC_TIMEX_H
   2#define _ASM_POWERPC_TIMEX_H
   3
   4#ifdef __KERNEL__
   5
   6/*
   7 * PowerPC architecture timex specifications
   8 */
   9
  10#include <asm/cputable.h>
  11#include <asm/reg.h>
  12
  13#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */
  14
  15typedef unsigned long cycles_t;
  16
  17static inline cycles_t get_cycles(void)
  18{
  19#ifdef __powerpc64__
  20        return mftb();
  21#else
  22        cycles_t ret;
  23
  24        /*
  25         * For the "cycle" counter we use the timebase lower half.
  26         * Currently only used on SMP.
  27         */
  28
  29        ret = 0;
  30
  31        __asm__ __volatile__(
  32                "97:    mftb %0\n"
  33                "99:\n"
  34                ".section __ftr_fixup,\"a\"\n"
  35                ".align 2\n"
  36                "98:\n"
  37                "       .long %1\n"
  38                "       .long 0\n"
  39                "       .long 97b-98b\n"
  40                "       .long 99b-98b\n"
  41                "       .long 0\n"
  42                "       .long 0\n"
  43                ".previous"
  44                : "=r" (ret) : "i" (CPU_FTR_601));
  45        return ret;
  46#endif
  47}
  48
  49#endif  /* __KERNEL__ */
  50#endif  /* _ASM_POWERPC_TIMEX_H */
  51