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Annotation of XNU/osfmk/i386/hi_res_clock_map.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /*
        !            26:  * HISTORY
        !            27:  * 
        !            28:  * Revision 1.1.1.1  1998/09/22 21:05:36  wsanchez
        !            29:  * Import of Mac OS X kernel (~semeria)
        !            30:  *
        !            31:  * Revision 1.1.1.1  1998/03/07 02:25:37  wsanchez
        !            32:  * Import of OSF Mach kernel (~mburg)
        !            33:  *
        !            34:  * Revision 1.1.7.1  1994/09/23  01:54:44  ezf
        !            35:  *     change marker to not FREE
        !            36:  *     [1994/09/22  21:23:10  ezf]
        !            37:  *
        !            38:  * Revision 1.1.2.2  1993/08/24  09:39:55  rod
        !            39:  *     Created for iX86 common high resolution clock common code.  CR #9400.
        !            40:  *     [1993/08/17  11:26:08  rod]
        !            41:  * 
        !            42:  * $EndLog$
        !            43:  */
        !            44: 
        !            45: #include <vm/pmap.h>
        !            46: #include <i386/hi_res_clock.h>
        !            47: 
        !            48: extern int *high_res_clock;
        !            49: 
        !            50: vm_offset_t
        !            51: hi_res_clk_mmap(
        !            52:        dev_t           dev,
        !            53:        vm_offset_t     off,
        !            54:        int             prot)
        !            55: {
        !            56:                if (prot & VM_PROT_WRITE) return (-1);
        !            57:                return (i386_btop(pmap_extract(pmap_kernel(), 
        !            58:                                              (vm_offset_t) high_res_clock)));
        !            59: }

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