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
  15 typedef unsigned long cycles_t;
  16
  17 static 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 #ifdef CONFIG_8xx
  33                 "97:    mftb %0\n"
  34 #else
  35                 "97:    mfspr %0, %2\n"
  36 #endif
  37                 "99:\n"
  38                 ".section __ftr_fixup,\"a\"\n"
  39                 ".align 2\n"
  40                 "98:\n"
  41                 "       .long %1\n"
  42                 "       .long 0\n"
  43                 "       .long 97b-98b\n"
  44                 "       .long 99b-98b\n"
  45                 "       .long 0\n"
  46                 "       .long 0\n"
  47                 ".previous"
  48 #ifdef CONFIG_8xx
  49                 : "=r" (ret) : "i" (CPU_FTR_601));
  50 #else
  51                 : "=r" (ret) : "i" (CPU_FTR_601), "i" (SPRN_TBRL));
  52 #endif
  53         return ret;
  54 #endif
  55 }
  56
  57 #endif  /* __KERNEL__ */
  58 #endif  /* _ASM_POWERPC_TIMEX_H */