failsafe_callback
(unsigned long) failsafe_callback,
void failsafe_callback(void);
GSEL(GCODE_SEL, SEL_KPL), (unsigned long)failsafe_callback);
void failsafe_callback(void);
extern void failsafe_callback(void);
initctx->failsafe_callback_eip = (unsigned long)failsafe_callback;
initctx->failsafe_callback_eip = (unsigned long)failsafe_callback;