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Add some comments.

This commit is contained in:
Alexander Motin 2010-07-23 08:20:14 +00:00
parent 44d1534122
commit a6cca5d8a1
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=210404

View File

@ -259,7 +259,7 @@ clock_intr(void *arg)
compare_next = count + cycles_per_tick;
DPCPU_SET(compare_ticks, compare_next);
mips_wr_compare(compare_next);
} else
} else /* In one-shot mode timer should be stopped after the event. */
mips_wr_compare(0xffffffff);
critical_enter();
@ -352,7 +352,7 @@ clock_attach(device_t dev)
sc->et.et_quality = 800;
sc->et.et_frequency = counter_freq;
sc->et.et_min_period.sec = 0;
sc->et.et_min_period.frac = 0x00004000LLU << 32;
sc->et.et_min_period.frac = 0x00004000LLU << 32; /* To be safe. */
sc->et.et_max_period.sec = 0xfffffffeU / sc->et.et_frequency;
sc->et.et_max_period.frac =
((0xfffffffeLLU << 32) / sc->et.et_frequency) << 32;