xnu-792.tar.gz

[apple/xnu.git] / osfmk / i386 / ldt.c

/*
 * 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@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */

/*
 * "Local" descriptor table.  At the moment, all tasks use the
 * same LDT.
 */
#include <i386/seg.h>
#include <i386/pmap.h>
#include <mach/i386/vm_types.h>
#include <mach/i386/vm_param.h>

extern int	syscall(void);
extern int	mach_rpc(void);

struct fake_descriptor	ldt[LDTSZ] = {
/*007*/	{ (unsigned int)&syscall,
	  KERNEL_CS,
	  0,				/* no parameters */
	  ACC_P|ACC_PL_U|ACC_CALL_GATE
	},				/* call gate for system calls */
/*00F*/	{ (unsigned int)&mach_rpc,
          KERNEL_CS,
          0,                            /* no parameters */
          ACC_P|ACC_PL_U|ACC_CALL_GATE
        },				/* call gate for mach rpc */
/*017*/	{ 0,
	  0xfffff,
 	  SZ_32|SZ_G,
	  ACC_P|ACC_PL_U|ACC_CODE_R
	},				/* user code segment */
/*01F*/	{ 0,
	  0xfffff,
	  SZ_32|SZ_G,
	  ACC_P|ACC_PL_U|ACC_DATA_W
	},				/* user data segment */
/*027*/	{ 0,
	  0xfffff,
	  SZ_32|SZ_G,
	  ACC_P|ACC_PL_U|ACC_DATA_W
	},				/* user cthread segment */
// Storage space for user ldt entries we will make room for 10 entries initially
// as we will probably never need many more than that
/*02F*/	{ 0, 0, 0, 0},
/*037*/	{ 0, 0, 0, 0},
/*03F*/	{ 0, 0, 0, 0},
/*047*/	{ 0, 0, 0, 0},
/*04F*/	{ 0, 0, 0, 0},
/*057*/	{ 0, 0, 0, 0},
/*05F*/	{ 0, 0, 0, 0},
/*067*/	{ 0, 0, 0, 0},
/*06F*/	{ 0, 0, 0, 0},
/*077*/	{ 0, 0, 0, 0},

};