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precision timer?

I need to measure the time between two events as precisely as possible on the
Axis82.  Any suggestions on what the best way to do this might be?  

My suspicion is that I should somehow use either the Real Time Clock on the
devboard or one of the built in hardware timers.  I'd rather do this in user
space than driver/kernel space.  I don't need to trigger other events, just
measure the time between two function calls.