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  * Copyright (c) 2010-2013 Alexander Motin <mav@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer,
   10  *    without modification, immediately at the beginning of the file.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.2/sys/sys/timeet.h 266347 2014-05-17 20:10:12Z ian $
   27  */
   28 
   29 #ifndef _SYS_TIMEEC_H_
   30 #define _SYS_TIMEEC_H_
   31 
   32 #ifndef _KERNEL
   33 #error "no user-serviceable parts inside"
   34 #endif
   35 
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/queue.h>
   39 #include <sys/time.h>
   40 
   41 /*
   42  * `struct eventtimer' is the interface between the hardware which implements
   43  * a event timer and the MI code which uses this to receive time events.
   44  */
   45 
   46 struct eventtimer;
   47 typedef int et_start_t(struct eventtimer *et,
   48     sbintime_t first, sbintime_t period);
   49 typedef int et_stop_t(struct eventtimer *et);
   50 typedef void et_event_cb_t(struct eventtimer *et, void *arg);
   51 typedef int et_deregister_cb_t(struct eventtimer *et, void *arg);
   52 
   53 struct eventtimer {
   54         SLIST_ENTRY(eventtimer) et_all;
   55                 /* Pointer to the next event timer. */
   56         char                    *et_name;
   57                 /* Name of the event timer. */
   58         int                     et_flags;
   59                 /* Set of capabilities flags: */
   60 #define ET_FLAGS_PERIODIC       1
   61 #define ET_FLAGS_ONESHOT        2
   62 #define ET_FLAGS_PERCPU         4
   63 #define ET_FLAGS_C3STOP         8
   64 #define ET_FLAGS_POW2DIV        16
   65         int                     et_quality;
   66                 /*
   67                  * Used to determine if this timecounter is better than
   68                  * another timecounter. Higher means better.
   69                  */
   70         int                     et_active;
   71         u_int64_t               et_frequency;
   72                 /* Base frequency in Hz. */
   73         sbintime_t              et_min_period;
   74         sbintime_t              et_max_period;
   75         et_start_t              *et_start;
   76         et_stop_t               *et_stop;
   77         et_event_cb_t           *et_event_cb;
   78         et_deregister_cb_t      *et_deregister_cb;
   79         void                    *et_arg;
   80         void                    *et_priv;
   81         struct sysctl_oid       *et_sysctl;
   82                 /* Pointer to the event timer's private parts. */
   83 };
   84 
   85 extern struct mtx       et_eventtimers_mtx;
   86 #define ET_LOCK()       mtx_lock(&et_eventtimers_mtx)
   87 #define ET_UNLOCK()     mtx_unlock(&et_eventtimers_mtx)
   88 
   89 /* Driver API */
   90 int     et_register(struct eventtimer *et);
   91 int     et_deregister(struct eventtimer *et);
   92 void    et_change_frequency(struct eventtimer *et, uint64_t newfreq);
   93 /* Consumer API  */
   94 struct eventtimer *et_find(const char *name, int check, int want);
   95 int     et_init(struct eventtimer *et, et_event_cb_t *event,
   96     et_deregister_cb_t *deregister, void *arg);
   97 int     et_start(struct eventtimer *et, sbintime_t first, sbintime_t period);
   98 int     et_stop(struct eventtimer *et);
   99 int     et_ban(struct eventtimer *et);
  100 int     et_free(struct eventtimer *et);
  101 
  102 #ifdef SYSCTL_DECL
  103 SYSCTL_DECL(_kern_eventtimer);
  104 #endif
  105 #endif /* !_SYS_TIMETC_H_ */
  106 

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