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Annotation of kernel/kern/time_stamp.h, revision 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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