The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/cctr.h

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    1 /*      $NetBSD: cctr.h,v 1.4 2020/10/10 03:05:04 thorpej 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 (/*CONSTCOND*/0)
   60 #endif /* _KERNEL */
   61 
   62 #endif /* _SYS_CCTR_H_ */

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