The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/hi_res_clock_map.c

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /*
   26  * @OSF_COPYRIGHT@
   27  */
   28 /*
   29  * HISTORY
   30  * 
   31  * Revision 1.1.1.1  1998/09/22 21:05:36  wsanchez
   32  * Import of Mac OS X kernel (~semeria)
   33  *
   34  * Revision 1.1.1.1  1998/03/07 02:25:37  wsanchez
   35  * Import of OSF Mach kernel (~mburg)
   36  *
   37  * Revision 1.1.7.1  1994/09/23  01:54:44  ezf
   38  *      change marker to not FREE
   39  *      [1994/09/22  21:23:10  ezf]
   40  *
   41  * Revision 1.1.2.2  1993/08/24  09:39:55  rod
   42  *      Created for iX86 common high resolution clock common code.  CR #9400.
   43  *      [1993/08/17  11:26:08  rod]
   44  * 
   45  * $EndLog$
   46  */
   47 
   48 #include <vm/pmap.h>
   49 #include <i386/hi_res_clock.h>
   50 
   51 extern int *high_res_clock;
   52 
   53 vm_offset_t
   54 hi_res_clk_mmap(
   55         dev_t           dev,
   56         vm_offset_t     off,
   57         int             prot)
   58 {
   59                if (prot & VM_PROT_WRITE) return (-1);
   60                return (i386_btop(pmap_extract(pmap_kernel(), 
   61                                               (vm_offset_t) high_res_clock)));
   62 }

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