1 /* 2 * linux/include/asm-alpha/timex.h 3 * 4 * ALPHA architecture timex specifications 5 */ 6 #ifndef _ASMALPHA_TIMEX_H 7 #define _ASMALPHA_TIMEX_H 8 9 /* With only one or two oddballs, we use the RTC as the ticker, selecting 10 the 32.768kHz reference clock, which nicely divides down to our HZ. */ 11 #define CLOCK_TICK_RATE 32768 12 13 /* 14 * Standard way to access the cycle counter. 15 * Currently only used on SMP for scheduling. 16 * 17 * Only the low 32 bits are available as a continuously counting entity. 18 * But this only means we'll force a reschedule every 8 seconds or so, 19 * which isn't an evil thing. 20 */ 21 22 typedef unsigned int cycles_t; 23 24 static inline cycles_t get_cycles (void) 25 { 26 cycles_t ret; 27 __asm__ __volatile__ ("rpcc %0" : "=r"(ret)); 28 return ret; 29 } 30 31 #endif 32