PSL_O
ci->ci_psw |= (cpu_info[0].ci_psw & PSL_O);
(curcpu()->ci_psw & PSL_O);
tf->tf_ipsw = ksc.sc_ps | (curcpu()->ci_psw & PSL_O);
curcpu()->ci_psw |= PSL_O;
(curcpu()->ci_psw & PSL_O);