clockvar.h

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    1 /*      $NetBSD: clockvar.h,v 1.8 2008/04/28 20:23:54 martin Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 1996, 2002 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _MVME_CLOCKVAR_H
   33 #define _MVME_CLOCKVAR_H
   34 
   35 #include <dev/clock_subr.h>
   36 
   37 /*
   38  * Definitions exported to ASIC-specific clock attachment.
   39  */
   40 
   41 extern  struct evcnt clock_profcnt;
   42 extern  struct evcnt clock_statcnt;
   43 
   44 extern  int clock_statvar;
   45 extern  int clock_statmin;
   46 
   47 struct clock_attach_args {
   48         void                    (*ca_initfunc)(void *, int, int);
   49         void                    *ca_arg;
   50 };
   51 
   52 void    clock_config(struct device *, struct clock_attach_args *,
   53                         struct evcnt *);
   54 
   55 /*
   56  * Macro to compute a new randomized interval.  The intervals are
   57  * uniformly distributed on [statint - statvar / 2, statint + statvar / 2],
   58  * and therefore have mean statint, giving a stathz frequency clock.
   59  *
   60  * This is gratuitously stolen from sparc/sparc/clock.c
   61  */
   62 #define CLOCK_NEWINT(statvar, statmin)  ({                              \
   63                 u_long r, var = (statvar);                              \
   64                 do { r = random() & (var - 1); } while (r == 0);        \
   65                 (statmin + r);                                          \
   66         })
   67 
   68 /*
   69  * Sun chose the year `68' as their base count, so that
   70  * cl_year==0 means 1968.
   71  */
   72 #define YEAR0   1968
   73 
   74 /*
   75  * interrupt level for clock
   76  */
   77 #define CLOCK_LEVEL 5
   78 
   79 #endif /* _MVME_CLOCKVAR_H */

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FreeBSD/Linux Kernel Cross Reference sys/dev/mvme/clockvar.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/mvme/clockvar.h