is used to set the reload value of sampling PMCs.
specified the handle a previously allocate sampling mode PMC.
specifies the reload count.
Sampling PMCs will interrupt the CPU after the number of
hardware events specified by the reload count are seen.
After the sampling interrupt is processed the underlying hardware will
be reloaded with the specified count and the hardware
automatically restarted by
should be called on PMC in a quiescent state.