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