MSR_PERF_STATUS
msr.ps_status_addr = MSR_PERF_STATUS;
msr = rdmsr(MSR_PERF_STATUS);
msr = rdmsr(MSR_PERF_STATUS);
fq = MSR2MHZ(rdmsr(MSR_PERF_STATUS), sc->sc_bus_clock);
msr = rdmsr(MSR_PERF_STATUS);