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Annotation of XNU/osfmk/i386/hi_res_clock_map.c, revision 1.1.1.1

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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