AMD_MSR_PSTATE_CSR_MASK
(pstates[i].st_cval & AMD_MSR_PSTATE_CSR_MASK);
cval = pstate->st_cval & AMD_MSR_PSTATE_CSR_MASK;
sval = rdmsr(AMD1X_MSR_PSTATE_ST) & AMD_MSR_PSTATE_CSR_MASK;
if ((pstates[i].st_sval & AMD_MSR_PSTATE_CSR_MASK) == sval)