nmi_action
nmi_action_t action = nmi_action;
nmi_action = NMI_ACTION_IGNORE;
nmi_action = NMI_ACTION_PANIC;
nmi_action = NMI_ACTION_KMDB;
nmi_action_t nmi_action = NMI_ACTION_UNSET;
extern nmi_action_t nmi_action;