AMD_PMC_EVSEL_0
d->pm_evsel = AMD_PMC_EVSEL_0 + i;
KASSERT(AMD_PMC_IS_STOPPED(AMD_PMC_EVSEL_0 + i),
error = wrmsr_safe(AMD_PMC_EVSEL_0, AMD_PMC_OS | AMD_PMC_USR);
error = rdmsr_safe(AMD_PMC_EVSEL_0, ®);
wrmsr(AMD_PMC_EVSEL_0, 0);