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   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
  12 #define CLOCK_TICK_RATE 1024000 /* Underlying HZ */
  13
  14 typedef unsigned long cycles_t;
  15
  16 static inline cycles_t get_cycles(void)
  17 {
  18         cycles_t ret;
  19
  20 #ifdef __powerpc64__
  21
  22         __asm__ __volatile__("mftb %0" : "=r" (ret) : );
  23
  24 #else
  25         /*
  26          * For the "cycle" counter we use the timebase lower half.
  27          * Currently only used on SMP.
  28          */
  29
  30         ret = 0;
  31
  32         __asm__ __volatile__(
  33                 "98:    mftb %0\n"
  34                 "99:\n"
  35                 ".section __ftr_fixup,\"a\"\n"
  36                 "       .long %1\n"
  37                 "       .long 0\n"
  38                 "       .long 98b\n"
  39                 "       .long 99b\n"
  40                 ".previous"
  41                 : "=r" (ret) : "i" (CPU_FTR_601));
  42 #endif
  43
  44         return ret;
  45 }
  46
  47 #endif  /* __KERNEL__ */
  48 #endif  /* _ASM_POWERPC_TIMEX_H */