MSR_TMTA_LRTI_READOUT
rdmsr(MSR_TMTA_LRTI_READOUT, msr_lo, msr_hi);
wrmsr(MSR_TMTA_LRTI_READOUT, msr_hi, msr_hi);
wrmsr(MSR_TMTA_LRTI_READOUT, 0, msr_hi);