callout_init
callout_init(); /* callout table MUST be init'd after cyclics */
extern void callout_init(void);
callout_init(&vatpit->channel[i].callout, 1);
callout_init(&vhpet->timer[i].callout, 1);
callout_init(&vlapic->callout, 1);
callout_init(&vrtc->callout, 1);