PSW_O
ci->ci_psw |= (cpus[0].ci_psw & PSW_O);
(hppa_cpu_ispa20_p() ? PSW_O : 0);
tf->tf_ipsw = PSW_MBS | (hppa_cpu_ispa20_p() ? PSW_O : 0);
curcpu()->ci_psw |= PSW_O;
(curcpu()->ci_psw & PSW_O);