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Annotation of kernel/kern/time_stamp.c, 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) 1987 Carnegie-Mellon University
        !            28:  * All rights reserved.  The CMU software License Agreement specifies
        !            29:  * the terms and conditions for use and redistribution.
        !            30:  */
        !            31: /*
        !            32:  * HISTORY
        !            33:  * 15-Feb-88  Gregg Kellogg (gk) at NeXT
        !            34:  *     NeXT: use microsecond counter like multimax
        !            35:  *
        !            36:  * 16-Jun-87  David Black (dlb) at Carnegie-Mellon University
        !            37:  *     machtimer.h --> timer.h  Changed to cpp symbols for multimax.
        !            38:  *
        !            39:  *  5-Apr-87  Avadis Tevanian (avie) at Carnegie-Mellon University
        !            40:  *     ts.h -> time_stamp.h
        !            41:  *
        !            42:  * 30-Mar-87  David Black (dlb) at Carnegie-Mellon University
        !            43:  *     Created.
        !            44:  */ 
        !            45: #import <mach/kern_return.h>
        !            46: #import <kern/time_stamp.h>
        !            47: #import <kern/clock.h>
        !            48: 
        !            49: #if    m68k
        !            50: #import <machdep/m68k/eventc.h>
        !            51: #endif m68k
        !            52: 
        !            53: /*
        !            54:  *     ts.c - kern_timestamp system call.
        !            55:  */
        !            56: 
        !            57: kern_return_t kern_timestamp(tsp)
        !            58:        struct  tsval   *tsp;
        !            59: {
        !            60:        struct tsval    ts;
        !            61: 
        !            62: #if    m68k
        !            63:        event_set_ts(&ts);
        !            64: #else  m68k
        !            65:        unsigned long long      usec_now;
        !            66:        tvalspec_t              now;
        !            67: 
        !            68:        now = clock_get_counter(System);
        !            69:        usec_now = ((unsigned long long)now.tv_sec * USEC_PER_SEC) +
        !            70:                        (now.tv_nsec / NSEC_PER_USEC);
        !            71:        ts.low_val = (unsigned int)usec_now;
        !            72:        ts.high_val = usec_now >> 32;
        !            73: #endif m68k
        !            74: 
        !            75:        if (copyout(&ts, tsp, sizeof(struct tsval)) != KERN_SUCCESS)
        !            76:                return(KERN_INVALID_ADDRESS);
        !            77: 
        !            78:        return(KERN_SUCCESS);
        !            79: }

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