Source to osfmk/i386/hi_res_clock_map.c

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/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/*
 * HISTORY
 * 
 * Revision 1.1.1.1  1998/09/22 21:05:36  wsanchez
 * Import of Mac OS X kernel (~semeria)
 *
 * Revision 1.1.1.1  1998/03/07 02:25:37  wsanchez
 * Import of OSF Mach kernel (~mburg)
 *
 * Revision 1.1.7.1  1994/09/23  01:54:44  ezf
 * 	change marker to not FREE
 * 	[1994/09/22  21:23:10  ezf]
 *
 * Revision 1.1.2.2  1993/08/24  09:39:55  rod
 * 	Created for iX86 common high resolution clock common code.  CR #9400.
 * 	[1993/08/17  11:26:08  rod]
 * 
 * $EndLog$
 */

#include <vm/pmap.h>
#include <i386/hi_res_clock.h>

extern int *high_res_clock;

vm_offset_t
hi_res_clk_mmap(
	dev_t		dev,
	vm_offset_t	off,
	int		prot)
{
               if (prot & VM_PROT_WRITE) return (-1);
               return (i386_btop(pmap_extract(pmap_kernel(), 
		                              (vm_offset_t) high_res_clock)));
}