FreeBSD/Linux Kernel Cross Reference
sys/include/asm-alpha/timex.h

     /*
      * linux/include/asm-alpha/timex.h
      *
      * ALPHA architecture timex specifications
      */
     #ifndef _ASMALPHA_TIMEX_H
     #define _ASMALPHA_TIMEX_H
     
     #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
    
    /*
     * Standard way to access the cycle counter.
     * Currently only used on SMP for scheduling.
     *
     * Only the low 32 bits are available as a continuously counting entity. 
     * But this only means we'll force a reschedule every 8 seconds or so,
     * which isn't an evil thing.
     */
    
    typedef unsigned int cycles_t;
    
    static inline cycles_t get_cycles (void)
    {
            cycles_t ret;
            __asm__ __volatile__ ("rpcc %0" : "=r"(ret));
            return ret;
    }
    
    #define vxtime_lock()           do {} while (0)
    #define vxtime_unlock()         do {} while (0)
    
    #endif

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