diff options
Diffstat (limited to 'kern')
| -rw-r--r-- | kern/timer.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kern/timer.h b/kern/timer.h index 4146237..4018236 100644 --- a/kern/timer.h +++ b/kern/timer.h @@ -36,10 +36,37 @@ * as a result. Service timers once an hour. */ +/* + * TIMER_MAX is needed if a 32-bit rollover timer needs to be adjusted for + * maximum value. + */ +#undef TIMER_MAX + +/* + * TIMER_RATE is the rate of the timer in ticks per second. It is used to + * calculate percent cpu usage. + */ #define TIMER_RATE 1000000 + +/* + * TIMER_HIGH_UNIT is the unit for high_bits in terms of low_bits. + * Setting it to TIMER_RATE makes the high unit seconds. + */ #define TIMER_HIGH_UNIT TIMER_RATE + +/* + * TIMER_ADJUST is used to adjust the value of a timer after it has been + * copied into a time_value_t. No adjustment is needed if high_bits is in + * seconds. + */ #undef TIMER_ADJUST +/* + * MACHINE_TIMER_ROUTINES should defined if the timer routines are + * implemented in machine-dependent code (e.g. assembly language). + */ +#undef MACHINE_TIMER_ROUTINES + #else /* STAT_TIME */ /* * Machine dependent definitions based on hardware support. |