CSR_TCFG_EN
timer_config = delta | CSR_TCFG_EN;
timer_config |= CSR_TCFG_EN;
timer_config |= (CSR_TCFG_PERIOD | CSR_TCFG_EN);
timer_config &= ~CSR_TCFG_EN;
if (kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG) & CSR_TCFG_EN)
if (!(cfg & CSR_TCFG_EN)) {
val |= CSR_TCFG_EN;