/* -*-  Mode:C; c-basic-offset:4; tab-width:4 -*-
 ****************************************************************************
 * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
 ****************************************************************************
 *
 *        File: events.h
 *      Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
 *     Changes: 
 *              
 *        Date: Jul 2003
 * 
 * Environment: Xen Minimal OS
 * Description: deal with events
 *
 ****************************************************************************
 * $Id: h-insert.h,v 1.4 2002/11/08 16:03:55 rn Exp $
 ****************************************************************************
 */

#ifndef _EVENTS_H_
#define _EVENTS_H_

/* _EVENT_* are defined in hypervisor-if.h  */
#define EV_BLKDEV _EVENT_BLKDEV
#define EV_TIMER  _EVENT_TIMER
#define EV_DIE    _EVENT_DIE
#define EV_DEBUG  _EVENT_DEBUG
#define EV_NET    _EVENT_NET
#define EV_PS2    _EVENT_PS2

#define NR_EVS (sizeof(HYPERVISOR_shared_info->events) * 8)

/* ev handler status */
#define EVS_INPROGRESS	1	/* Event handler active - do not enter! */
#define EVS_DISABLED	2	/* Event disabled - do not enter! */
#define EVS_PENDING	    4	/* Event pending - replay on enable */
#define EVS_REPLAY	    8	/* Event has been replayed but not acked yet */

/* this represents a event handler. Chaining or sharing is not allowed */
typedef struct _ev_action_t {
	void (*handler)(int, struct pt_regs *);
    unsigned int status;		/* IRQ status */
    u32 count;
} ev_action_t;

/* prototypes */
unsigned int do_event(int ev, struct pt_regs *regs);
unsigned int add_ev_action( int ev, void (*handler)(int, struct pt_regs *) );
unsigned int enable_ev_action( int ev );
unsigned int disable_ev_action( int ev );
void init_events(void);

#endif /* _EVENTS_H_ */