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	1	/*
	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58	/*
	59	* File: mach/vm_prot.h
	60	* Author: Avadis Tevanian, Jr., Michael Wayne Young
	61	*
	62	* Virtual memory protection definitions.
	63	*
	64	*/
	65
	66	#ifndef _MACH_VM_PROT_H_
	67	#define _MACH_VM_PROT_H_
	68
	69	/*
	70	* Types defined:
	71	*
	72	* vm_prot_t VM protection values.
	73	*/
	74
	75	typedef int vm_prot_t;
	76
	77	/*
	78	* Protection values, defined as bits within the vm_prot_t type
	79	*/
	80
	81	#define VM_PROT_NONE ((vm_prot_t) 0x00)
	82
	83	#define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
	84	#define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
	85	#define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
	86
	87	/*
	88	* The default protection for newly-created virtual memory
	89	*/
	90
	91	#define VM_PROT_DEFAULT (VM_PROT_READ\|VM_PROT_WRITE)
	92
	93	/*
	94	* The maximum privileges possible, for parameter checking.
	95	*/
	96
	97	#define VM_PROT_ALL (VM_PROT_READ\|VM_PROT_WRITE\|VM_PROT_EXECUTE)
	98
	99	/*
	100	* An invalid protection value.
	101	* Used only by memory_object_lock_request to indicate no change
	102	* to page locks. Using -1 here is a bad idea because it
	103	* looks like VM_PROT_ALL and then some.
	104	*/
	105
	106	#define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
	107
	108	/*
	109	* When a caller finds that he cannot obtain write permission on a
	110	* mapped entry, the following flag can be used. The entry will
	111	* be made "needs copy" effectively copying the object (using COW),
	112	* and write permission will be added to the maximum protections
	113	* for the associated entry.
	114	*/
	115
	116	#define VM_PROT_COPY ((vm_prot_t) 0x10)
	117
	118
	119	/*
	120	* Another invalid protection value.
	121	* Used only by memory_object_data_request upon an object
	122	* which has specified a copy_call copy strategy. It is used
	123	* when the kernel wants a page belonging to a copy of the
	124	* object, and is only asking the object as a result of
	125	* following a shadow chain. This solves the race between pages
	126	* being pushed up by the memory manager and the kernel
	127	* walking down the shadow chain.
	128	*/
	129
	130	#define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
	131
	132	#ifdef PRIVATE
	133	/*
	134	* The caller wants this memory region treated as if it had a valid
	135	* code signature.
	136	*/
	137
	138	#define VM_PROT_TRUSTED ((vm_prot_t) 0x20)
	139	#endif /* PRIVATE */
	140
	141	/*
	142	* Another invalid protection value.
	143	* Indicates that the other protection bits are to be applied as a mask
	144	* against the actual protection bits of the map entry.
	145	*/
	146	#define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
	147
	148	#endif /* _MACH_VM_PROT_H_ */