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This is immediately necessary for the PMUv3 implementation to check ID_DFR0.PerfMon to enable/disable specific features, but defines the full complement of fields for possible future use elsewhere. Signed-off-by: Aaron Lindsay <aaron@os.amperecomputing.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20181211151945.29137-8-aaron@os.amperecomputing.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>