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Annotation of kernel/kern/time_stamp.c, 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) 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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