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/* $OpenBSD: rf_etimer.h,v 1.2 1999/02/16 00:02:43 niklas Exp $ */
/* $NetBSD: rf_etimer.h,v 1.3 1999/02/05 00:06:11 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/* rf_etimer.h -- header file for code related to accurate timing
* This code currently assumes that the elapsed time between START_TIMER
* and START_TIMER is less than the period of the cycle counter. This
* means the events you want to time must be less than:
* clock speed max time
* ---------- --------
* 175 MHz 24 sec
* 150 MHz 28 sec
* 125 MHz 34 sec
*
*
*/
#ifndef _RF__RF_TIMER_H_
#define _RF__RF_TIMER_H_
#include "rf_options.h"
extern unsigned int rpcc(void);
#define rf_read_cycle_counter rpcc
#define RF_DEF_TIMER_MAX_VAL 0xFFFFFFFF
typedef struct RF_EtimerVal_s {
unsigned ccnt; /* cycle count */
} RF_EtimerVal_t;
struct RF_Etimer_s {
RF_EtimerVal_t st;
RF_EtimerVal_t et;
unsigned long ticks; /* elapsed time in ticks */
};
extern long rf_timer_max_val;
extern long rf_timer_ticks_per_second;
extern unsigned long rf_timer_ticks_per_usec;
#define RF_ETIMER_TICKS2US(_tcks_) ( (_tcks_) / rf_timer_ticks_per_usec )
#define RF_ETIMER_START(_t_) { (_t_).st.ccnt = rf_read_cycle_counter(); }
#define RF_ETIMER_STOP(_t_) { (_t_).et.ccnt = rf_read_cycle_counter(); }
#define RF_ETIMER_EVAL(_t_) { \
if ((_t_).st.ccnt < (_t_).et.ccnt) \
(_t_).ticks = (_t_).et.ccnt - (_t_).st.ccnt; \
else \
(_t_).ticks = rf_timer_max_val - ((_t_).st.ccnt - (_t_).et.ccnt); \
}
#define RF_ETIMER_VAL_TICKS(_t_) ((_t_).ticks)
#define RF_ETIMER_VAL_US(_t_) (RF_ETIMER_TICKS2US((_t_).ticks))
#define RF_ETIMER_VAL_MS(_t_) (RF_ETIMER_TICKS2US((_t_).ticks)/1000)
#endif /* !_RF__RF_TIMER_H_ */
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