diff options
Diffstat (limited to 'sys/sparc64/sparc64/machdep.c')
| -rw-r--r-- | sys/sparc64/sparc64/machdep.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/sparc64/sparc64/machdep.c b/sys/sparc64/sparc64/machdep.c index 582930d..f7f08c4 100644 --- a/sys/sparc64/sparc64/machdep.c +++ b/sys/sparc64/sparc64/machdep.c @@ -132,6 +132,16 @@ struct kva_md_info kmi; u_long ofw_vec; u_long ofw_tba; +/* + * Note: timer quality for CPU's is set low to try and prevent them from + * being chosen as the primary timecounter. The CPU counters are not + * synchronized among the CPU's so in MP machines this causes problems + * when calculating the time. With this value the CPU's should only be + * chosen as the primary timecounter as a last resort. + */ + +#define UP_TICK_QUALITY 1000 +#define MP_TICK_QUALITY -100 static struct timecounter tick_tc; char sparc64_model[32]; @@ -174,6 +184,15 @@ cpu_startup(void *arg) tick_tc.tc_counter_mask = ~0u; tick_tc.tc_frequency = tick_freq; tick_tc.tc_name = "tick"; + tick_tc.tc_quality = UP_TICK_QUALITY; +#ifdef SMP + /* + * We do not know if each CPU's tick counter is synchronized. + */ + if (cpu_mp_probe()) + tick_tc.tc_quality = MP_TICK_QUALITY; +#endif + tc_init(&tick_tc); physsz = 0; |
