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/kern/time_stamp.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        time_stamp.h,v $
   29  * Revision 2.3  91/05/14  16:49:41  mrt
   30  *      Correcting copyright
   31  * 
   32  * Revision 2.2  91/02/05  17:30:58  mrt
   33  *      Changed to new Mach copyright
   34  *      [91/02/01  16:20:48  mrt]
   35  * 
   36  * Revision 2.1  89/08/03  15:57:28  rwd
   37  * Created.
   38  * 
   39  *  5-Apr-87  Avadis Tevanian (avie) at Carnegie-Mellon University
   40  *      Isolate machine dependencies - machine/time_stamp chooses a
   41  *      TS_FORMAT, if not choosed this module defaults it to 1.  Also
   42  *      guarded against multiple inclusion.
   43  *
   44  * 30-Mar-87  David Black (dlb) at Carnegie-Mellon University
   45  *      Created.
   46  *
   47  */ 
   48 
   49 #ifndef _KERN_TIME_STAMP_H_
   50 #define _KERN_TIME_STAMP_H_
   51 
   52 #include <machine/time_stamp.h>
   53 /*
   54  *      time_stamp.h -- definitions for low-overhead timestamps.
   55  */
   56 
   57 struct tsval {
   58         unsigned        low_val;        /* least significant word */
   59         unsigned        high_val;       /* most significant word */
   60 };
   61 
   62 /*
   63  *      Format definitions.
   64  */
   65 
   66 #ifndef TS_FORMAT
   67 /*
   68  *      Default case - Just return a tick count for machines that
   69  *      don't support or haven't implemented this.  Assume 100Hz ticks.
   70  *
   71  *      low_val - Always 0.
   72  *      high_val - tick count.
   73  */
   74 #define TS_FORMAT       1
   75 
   76 #if     KERNEL 
   77 unsigned        ts_tick_count;
   78 #endif  KERNEL
   79 #endif  TS_FORMAT
   80 
   81 /*
   82  *      List of all format definitions for convert_ts_to_tv.
   83  */
   84 
   85 #define TS_FORMAT_DEFAULT       1
   86 #define TS_FORMAT_MMAX          2
   87 #endif  _KERN_TIME_STAMP_H_

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