RVController Zihpm Counter List
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The following counters are supported as part of the Zihpm extension:

* hpmcounter3: Number of interrupts serviced
* hpmcounter4: Number of non-interrupt traps handled
* hpmcounter5: Number of digilines messages received (excluding console)
* hpmcounter6: Number of console events received

The upper word of each of these values is available in the corresponding hpmcounterXXh CSR.