FreeBSD/Linux Kernel Cross Reference
sys/device/clock_status.h

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1992 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        clock_status.h,v $
     * Revision 2.2  93/11/17  16:30:42  dbg
     *      Renamed to device/clock_status.h.
     *      [93/06/02            dbg]
     * 
     *      64 bit cleanup.
     *      [93/02/19            dbg]
     * 
     *      Moved kernel definitions to kern/clock.h.  Generalized
     *      clockres_request_t to clock_resolution_t, to return
     *      skew for devices with odd clock frequencies.
     * 
     *      Created
     *      [92/07/12       savage]
     * 
     */
    
    /*
     *      Exported clock device abstraction.
     */
    #ifndef _DEVICE_CLOCK_STATUS_H_
    #define _DEVICE_CLOCK_STATUS_H_
    
    #include <mach/time_spec.h>
    #include <device/device_types.h>
    
    /*
     *      A clock exports three items of status:
     *      current time
     *      resolution
     *      correction factor
     */
    
    /*
     *      Time is measured as a time_spec.
     */
    #define CLOCK_TIME              1
    #define CLOCK_TIME_COUNT        (sizeof(time_spec_t) / sizeof(int))
    
    /*
     *      Resolution is defined as the resolution of
     *      the clock, and an allowable skew from that resolution.
     */
    struct clock_resolution {
            int             resolution;     /* in nsecs */
            int             skew;           /* in nsecs */
    };
    #define CLOCK_RESOLUTION_COUNT  \
                    (sizeof(clock_resolution_data_t) / sizeof(int))
    
    #define CLOCK_RESOLUTION        2
    
    typedef struct clock_resolution clock_resolution_data_t;
    typedef struct clock_resolution *clock_resolution_t;
    
    /*
     *      The clock correction factor is an increment
     *      to be added to the clock time every clock
     *      tick (every 'clock_resolution' nanoseconds),
     *      and the number of clock ticks over which it
     *      should be added.
     */
    struct clock_correction {
            int             delta;          /* correction, in nanoseconds */
            int             count;          /* number of clock periods over
                                               which correction is applied */
    };
    #define CLOCK_CORRECTION_COUNT \
                    (sizeof(clock_correction_data_t) / sizeof(int))
    
    #define CLOCK_CORRECTION        3
    
   typedef struct clock_correction clock_correction_data_t;
   typedef struct clock_correction *clock_correction_t;
   
   #endif  /* _DEVICE_CLOCK_STATUS_H_ */
   
   
   
   
   
   
   
   

Cache object: 77e8cb0affd8eb99f3cf06475a5da6f7