include/asm-ppc/timex.h

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 1 /*
 2  * linux/include/asm-ppc/timex.h
 3  *
 4  * ppc architecture timex specifications
 5  */
 6 #ifndef _ASMppc_TIMEX_H
 7 #define _ASMppc_TIMEX_H
 8
 9 #define CLOCK_TICK_RATE 1193180/* Underlying HZ */
 10 #define CLOCK_TICK_FACTOR 20/* Factor of both 1000000 and CLOCK_TICK_RATE */
 11 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
 12  (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
 13  << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
 14
 15 typedefunsigned long cycles_t;
 16
 17 /*
 18  * For the "cycle" counter we use the timebase lower half.
 19  * Currently only used on SMP.
 20  *
 21  * Since SMP kernels won't run on the PPC601 CPU (which doesn't have
 22  * the timebase register) anyway, we don't bother checking the CPU version.
 23  */
 24
 25 extern cycles_t cacheflush_time;
 26
 27 staticinline cycles_t get_cycles(void)
 28 {
 29 #ifdef __SMP__
 30  cycles_t ret;
 31
 32 __asm__("mftb %0":"=r"(ret) : );
 33 return ret;
 34 #else
 35 return0;
 36 #endif
 37 }
 38
 39 #endif