#ifndef _ASM_POWERPC_TIMEX_H
  #define _ASM_POWERPC_TIMEX_H
  
  #ifdef __KERNEL__

  /*

   * PowerPC architecture timex specifications

   */

  #include <asm/cputable.h>

  #include <asm/reg.h>

  #define CLOCK_TICK_RATE	1024000 /* Underlying HZ */

  
  typedef unsigned long cycles_t;

  static inline cycles_t get_cycles(void)
  {

  #ifdef __powerpc64__

  	return mftb();

  #else

  	cycles_t ret;

  	/*
  	 * For the "cycle" counter we use the timebase lower half.
  	 * Currently only used on SMP.
  	 */
  
  	ret = 0;

  
  	__asm__ __volatile__(

  		"97:	mftb %0
  "

  		"99:
  "
  		".section __ftr_fixup,\"a\"
  "

  		".align 2
  "
  		"98:
  "

  		"	.long %1
  "
  		"	.long 0
  "

  		"	.long 97b-98b
  "
  		"	.long 99b-98b
  "

  		".previous"
  		: "=r" (ret) : "i" (CPU_FTR_601));
  	return ret;

  #endif

  }

  #endif	/* __KERNEL__ */
  #endif	/* _ASM_POWERPC_TIMEX_H */