armv8pmu_pmcr_read
0, FIELD_GET(ARMV8_PMU_PMCR_N, armv8pmu_pmcr_read()));
armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
armv8pmu_pmcr_write(armv8pmu_pmcr_read() & ~ARMV8_PMU_PMCR_E);