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      1 /*	$NetBSD: cctr.h,v 1.5 2024/05/12 10:34:56 rillig Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004, 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef _SYS_CCTR_H_
     30 #define	_SYS_CCTR_H_
     31 
     32 #include <sys/timetc.h>
     33 
     34 /*
     35  * Variables used by cycle counter in kern_cctr.c.
     36  */
     37 struct cctr_state {
     38 	volatile int64_t cc_delta;	/* delta from primary CPU CC */
     39 	u_int cc_cal_ticks;		/* # ticks between calibrations */
     40 	u_int cc_ticks;			/* # ticks since last calibration */
     41 };
     42 
     43 #ifdef _KERNEL
     44 struct cpu_info;
     45 
     46 struct timecounter *cc_init(timecounter_get_t, uint64_t, const char *, int);
     47 void	cc_init_secondary(struct cpu_info *);
     48 u_int	cc_get_timecount(struct timecounter *);
     49 void	cc_calibrate_cpu(struct cpu_info *);
     50 void	cc_primary_cc(void);
     51 
     52 #define	cc_hardclock(ci)						\
     53 do {									\
     54 	if ((ci)->ci_cc.cc_cal_ticks &&					\
     55 	    ++(ci)->ci_cc.cc_ticks == (ci)->ci_cc.cc_cal_ticks) {	\
     56 		(ci)->ci_cc.cc_ticks = 0;				\
     57 		cc_calibrate_cpu((ci));					\
     58 	}								\
     59 } while (0)
     60 #endif /* _KERNEL */
     61 
     62 #endif /* _SYS_CCTR_H_ */
     63