include/asm-ppc/timex.h

   1 /*
   2  * include/asm-ppc/timex.h
   3  *
   4  * ppc architecture timex specifications
   5  */
   6 #ifdef __KERNEL__
   7 #ifndef _ASMppc_TIMEX_H
   8 #define _ASMppc_TIMEX_H
   9
  10 #include <linux/config.h>
  11 #include <asm/cputable.h>
  12
  13 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
  14 #define CLOCK_TICK_FACTOR       20      /* Factor of both 1000000 and CLOCK_TICK_RATE */
  15 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
  16         (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
  17                 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
  18
  19 typedef unsigned long cycles_t;
  20
  21 /*
  22  * For the "cycle" counter we use the timebase lower half.
  23  * Currently only used on SMP.
  24  */
  25
  26 extern cycles_t cacheflush_time;
  27
  28 static inline cycles_t get_cycles(void)
  29 {
  30         cycles_t 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         return ret;
  43 }
  44
  45 #endif
  46 #endif /* __KERNEL__ */