timer.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991 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 /*
   28  * HISTORY
   29  * $Log:        timer.h,v $
   30  * Revision 2.2  91/07/31  17:41:51  dbg
   31  *      Created.
   32  *      [91/07/30  16:58:38  dbg]
   33  * 
   34  */
   35 
   36 #ifndef _I386_TIMER_H_
   37 #define _I386_TIMER_H_
   38 
   39 /*
   40  *      Machine dependent timer definitions.
   41  */
   42 
   43 #include <platforms.h>
   44 
   45 #ifdef  SYMMETRY
   46 
   47 /*
   48  *      TIMER_MAX is not used on the Sequent because a 32-bit rollover
   49  *      timer does not need to be adjusted for maximum value.
   50  */
   51 
   52 /*
   53  *      TIMER_RATE is the rate of the timer in ticks per second.
   54  *      It is used to calculate percent cpu usage.
   55  */
   56 
   57 #define TIMER_RATE      1000000
   58 
   59 /*
   60  *      TIMER_HIGH_UNIT is the unit for high_bits in terms of low_bits.
   61  *      Setting it to TIMER_RATE makes the high unit seconds.
   62  */
   63 
   64 #define TIMER_HIGH_UNIT TIMER_RATE
   65 
   66 /*
   67  *      TIMER_ADJUST is used to adjust the value of a timer after
   68  *      it has been copied into a time_value_t.  No adjustment is needed
   69  *      on Sequent because high_bits is in seconds.
   70  */
   71 
   72 /*
   73  *      MACHINE_TIMER_ROUTINES should defined if the timer routines are
   74  *      implemented in machine-dependent code (e.g. assembly language).
   75  */
   76 #define MACHINE_TIMER_ROUTINES
   77 
   78 #endif
   79 
   80 #endif  /* _I386_TIMER_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/timer.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/timer.h