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/timeet.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010-2013 Alexander Motin <mav@FreeBSD.org>
    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  *    without modification, immediately at the beginning of the file.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: head/sys/sys/timeet.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef _SYS_TIMEEC_H_
   32 #define _SYS_TIMEEC_H_
   33 
   34 #ifndef _KERNEL
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <sys/queue.h>
   41 #include <sys/time.h>
   42 
   43 /*
   44  * `struct eventtimer' is the interface between the hardware which implements
   45  * a event timer and the MI code which uses this to receive time events.
   46  */
   47 
   48 struct eventtimer;
   49 typedef int et_start_t(struct eventtimer *et,
   50     sbintime_t first, sbintime_t period);
   51 typedef int et_stop_t(struct eventtimer *et);
   52 typedef void et_event_cb_t(struct eventtimer *et, void *arg);
   53 typedef int et_deregister_cb_t(struct eventtimer *et, void *arg);
   54 
   55 struct eventtimer {
   56         SLIST_ENTRY(eventtimer) et_all;
   57                 /* Pointer to the next event timer. */
   58         const char              *et_name;
   59                 /* Name of the event timer. */
   60         int                     et_flags;
   61                 /* Set of capabilities flags: */
   62 #define ET_FLAGS_PERIODIC       1
   63 #define ET_FLAGS_ONESHOT        2
   64 #define ET_FLAGS_PERCPU         4
   65 #define ET_FLAGS_C3STOP         8
   66 #define ET_FLAGS_POW2DIV        16
   67         int                     et_quality;
   68                 /*
   69                  * Used to determine if this timecounter is better than
   70                  * another timecounter. Higher means better.
   71                  */
   72         int                     et_active;
   73         u_int64_t               et_frequency;
   74                 /* Base frequency in Hz. */
   75         sbintime_t              et_min_period;
   76         sbintime_t              et_max_period;
   77         et_start_t              *et_start;
   78         et_stop_t               *et_stop;
   79         et_event_cb_t           *et_event_cb;
   80         et_deregister_cb_t      *et_deregister_cb;
   81         void                    *et_arg;
   82         void                    *et_priv;
   83         struct sysctl_oid       *et_sysctl;
   84                 /* Pointer to the event timer's private parts. */
   85 };
   86 
   87 extern struct mtx       et_eventtimers_mtx;
   88 #define ET_LOCK()       mtx_lock(&et_eventtimers_mtx)
   89 #define ET_UNLOCK()     mtx_unlock(&et_eventtimers_mtx)
   90 
   91 /* Driver API */
   92 int     et_register(struct eventtimer *et);
   93 int     et_deregister(struct eventtimer *et);
   94 void    et_change_frequency(struct eventtimer *et, uint64_t newfreq);
   95 /* Consumer API  */
   96 struct eventtimer *et_find(const char *name, int check, int want);
   97 int     et_init(struct eventtimer *et, et_event_cb_t *event,
   98     et_deregister_cb_t *deregister, void *arg);
   99 int     et_start(struct eventtimer *et, sbintime_t first, sbintime_t period);
  100 int     et_stop(struct eventtimer *et);
  101 int     et_ban(struct eventtimer *et);
  102 int     et_free(struct eventtimer *et);
  103 
  104 #ifdef SYSCTL_DECL
  105 SYSCTL_DECL(_kern_eventtimer);
  106 #endif
  107 #endif /* !_SYS_TIMETC_H_ */
  108 

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