diff options
Diffstat (limited to 'include/asm-alpha/timex.h')
| -rw-r--r-- | include/asm-alpha/timex.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/asm-alpha/timex.h b/include/asm-alpha/timex.h index c0bfb799c..2576553b3 100644 --- a/include/asm-alpha/timex.h +++ b/include/asm-alpha/timex.h @@ -8,4 +8,23 @@ #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; +extern cycles_t cacheflush_time; + +static inline cycles_t get_cycles (void) +{ + cycles_t ret; + __asm__ __volatile__ ("rpcc %0" : "=r"(ret)); + return ret; +} + #endif |