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

#ifndef _TIME_H_
#define _TIME_H_

#include <list.h>

/*
 * System Time
 * 64 bit value containing the nanoseconds elapsed since boot time.
 * This value is adjusted by frequency drift.
 * NOW() returns the current time.
 * The other macros are for convenience to approximate short intervals
 * of real time into system time 
 */
typedef s64 s_time_t;
#define NOW()                   ((s_time_t)get_s_time())
#define SECONDS(_s)             (((s_time_t)(_s))  * 1000000000UL )
#define TENTHS(_ts)             (((s_time_t)(_ts)) * 100000000UL )
#define HUNDREDTHS(_hs)         (((s_time_t)(_hs)) * 10000000UL )
#define MILLISECS(_ms)          (((s_time_t)(_ms)) * 1000000UL )
#define MICROSECS(_us)          (((s_time_t)(_us)) * 1000UL )
#define Time_Max                ((s_time_t) 0x7fffffffffffffffLL)
#define FOREVER                 Time_Max


/* wall clock time  */
typedef long time_t;
typedef long suseconds_t;
struct timeval {
	time_t		tv_sec;		/* seconds */
	suseconds_t	tv_usec;	/* microseconds */
};


/* prototypes */
void     init_time(void);
s_time_t get_s_time(void);
s_time_t get_v_time(void);
void     gettimeofday(struct timeval *tv);

#endif /* _TIME_H_ */