CPUCFG6_PMBITS_SHIFT
bits = ((read_cpucfg(LOONGARCH_CPUCFG6) & CPUCFG6_PMBITS) >> CPUCFG6_PMBITS_SHIFT) + 1;
counter_bits = ((cfg6 & CPUCFG6_PMBITS) >> CPUCFG6_PMBITS_SHIFT) + 1;