PERFMON_CMD_ENABLE
wrperfmon(PERFMON_CMD_ENABLE, (1UL<<hwc->idx));
wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask);
wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask);
wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask);
wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask);
wrperfmon(PERFMON_CMD_ENABLE, cpuc->idx_mask);