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Linux Cross Reference
Linux/include/asm-ppc/timex.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 /*
  2  * linux/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 
 12 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
 13 #define CLOCK_TICK_FACTOR       20      /* Factor of both 1000000 and CLOCK_TICK_RATE */
 14 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
 15         (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
 16                 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
 17 
 18 typedef unsigned long cycles_t;
 19 
 20 /*
 21  * For the "cycle" counter we use the timebase lower half.
 22  * Currently only used on SMP.
 23  *
 24  * Since SMP kernels won't run on the PPC601 CPU (which doesn't have
 25  * the timebase register) anyway, we don't bother checking the CPU version.
 26  */
 27 
 28 extern cycles_t cacheflush_time;
 29 
 30 static inline cycles_t get_cycles(void)
 31 {
 32 #ifdef CONFIG_SMP
 33         cycles_t ret;
 34 
 35         __asm__("mftb %0" : "=r" (ret) : );
 36         return ret;
 37 #else
 38         return 0;
 39 #endif
 40 }
 41 
 42 #endif
 43 #endif /* __KERNEL__ */
 44
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