freebsd-nq/sys/dev/mc146818
Marius Strobl fce21e7e25 After some input from bde@ and rereading the datasheet use a MTX_SPIN
mutex instead of a MTX_DEF one in order to defer preemption while
reading the date and time registers. If we don't manage to read them
within the time slot where we are guaranteed that no updates occur we
might actually read them during an update in which case the output is
undefined.
2005-06-04 23:24:50 +00:00
..
mc146818.c After some input from bde@ and rereading the datasheet use a MTX_SPIN 2005-06-04 23:24:50 +00:00
mc146818reg.h
mc146818var.h o mc146818(4): 2005-05-19 21:20:42 +00:00