AMD_CPPC_HIGHEST_PERF_MASK
val = FIELD_GET(AMD_CPPC_HIGHEST_PERF_MASK, val);
highest_perf = FIELD_GET(AMD_CPPC_HIGHEST_PERF_MASK, cap1);
WRITE_ONCE(cpudata->prefcore_ranking, FIELD_GET(AMD_CPPC_HIGHEST_PERF_MASK, cap1));