* The pm_interval register is setup to write the SPU PC value into the
* trace buffer at the maximum rate possible. The trace buffer is configured
* to store the PCs, wrapping when it is full. The performance counter is
* The pm_interval register is setup to write the SPU PC value into the
* trace buffer at the maximum rate possible. The trace buffer is configured
* to store the PCs, wrapping when it is full. The performance counter is