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Annotation of kernel/kern/time_stamp.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: 
                     51: #ifndef        _KERN_TIME_STAMP_H_
                     52: #define _KERN_TIME_STAMP_H_
                     53: 
                     54: #import <mach/machine/kern_return.h>
                     55: #import <machdep/machine/time_stamp.h>
                     56: /*
                     57:  *     time_stamp.h -- definitions for low-overhead timestamps.
                     58:  */
                     59: 
                     60: struct tsval {
                     61:        unsigned        low_val;        /* least significant word */
                     62:        unsigned        high_val;       /* most significant word */
                     63: };
                     64: 
                     65: /*
                     66:  *     Format definitions.
                     67:  */
                     68: 
                     69: #ifndef        TS_FORMAT
                     70: /*
                     71:  *     Default case - Just return a tick count for machines that
                     72:  *     don't support or haven't implemented this.  Assume 100Hz ticks.
                     73:  *
                     74:  *     low_val - Always 0.
                     75:  *     high_val - tick count.
                     76:  */
                     77: #define        TS_FORMAT       1
                     78: 
                     79: #if    KERNEL 
                     80: extern unsigned        ts_tick_count;
                     81: #endif /* KERNEL */
                     82: #endif /* TS_FORMAT */
                     83: 
                     84: extern kern_return_t kern_timestamp(struct tsval *);
                     85: 
                     86: /*
                     87:  *     List of all format definitions for convert_ts_to_tv.
                     88:  */
                     89: 
                     90: #define        TS_FORMAT_DEFAULT       1
                     91: #define TS_FORMAT_MMAX         2
                     92: #define TS_FORMAT_NeXT         3
                     93: 
                     94: #endif /* _KERN_TIME_STAMP_H_ */

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