clockpit.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993,1992 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:        clockpit.h,v $
   29  * Revision 2.2  93/11/17  16:42:11  dbg
   30  *      Merged into mainline.
   31  * 
   32  *      Created
   33  *      [92/06/22       savage]
   34  * 
   35  */
   36 
   37 #ifndef _I386AT_CLOCKPIT_H_
   38 #define _I386AT_CLOCKPIT_H_
   39 
   40 #include <i386/mach_param.h>            /* for default HZ */
   41 #include <mach/time_spec.h>
   42 
   43 io_return_t     clockpitprobe();
   44 io_return_t     clockpitattach();
   45 io_return_t     clockpitopen();
   46 io_return_t     clockpitopen();
   47 io_return_t     clockpitgetstat();
   48 io_return_t     clockpitsetstat();
   49 io_return_t     clockpitmmap();
   50 int             clockrtsetresolution();
   51 
   52 /*
   53  *      Adjust for PIT clock round off... Ugly, but true...
   54  */
   55 #define CLOCKPIT_SKEW(res)              (((CLKNUM%(NANOSEC_PER_SEC/res)) \
   56                                                * res) / CLKNUM)
   57 #define CLOCKPIT_DEFAULT_RESOLUTION     (NANOSEC_PER_SEC/HZ - \
   58                                          CLOCKPIT_SKEW((NANOSEC_PER_SEC/HZ)))
   59 
   60 #define CLOCKPIT_MAX_RESOLUTION         (10000000)
   61 
   62 /*
   63  *      Minimum set to 1/2 a millisecond... if you want to play with lower
   64  *      then change this number.
   65  */
   66 #define CLOCKPIT_MIN_RESOLUTION         (500000)
   67 
   68 
   69 #endif  /* _I386AT_CLOCKPIT_H_ */
   70

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FreeBSD/Linux Kernel Cross Reference sys/i386at/clockpit.h

FreeBSD/Linux Kernel Cross Reference
sys/i386at/clockpit.h