]>
git.saurik.com Git - apple/xnu.git/blob - osfmk/mach/vm_prot.h
2 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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.
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
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.
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
32 * Mach Operating System
33 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
34 * All Rights Reserved.
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.
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.
46 * Carnegie Mellon requests users of this software to return to
48 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
49 * School of Computer Science
50 * Carnegie Mellon University
51 * Pittsburgh PA 15213-3890
53 * any improvements or extensions that they make and grant Carnegie Mellon
54 * the rights to redistribute these changes.
59 * File: mach/vm_prot.h
60 * Author: Avadis Tevanian, Jr., Michael Wayne Young
62 * Virtual memory protection definitions.
66 #ifndef _MACH_VM_PROT_H_
67 #define _MACH_VM_PROT_H_
72 * vm_prot_t VM protection values.
75 typedef int vm_prot_t
;
78 * Protection values, defined as bits within the vm_prot_t type
81 #define VM_PROT_NONE ((vm_prot_t) 0x00)
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 */
88 * The default protection for newly-created virtual memory
91 #define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
94 * The maximum privileges possible, for parameter checking.
97 #define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
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.
106 #define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
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.
116 #define VM_PROT_COPY ((vm_prot_t) 0x10)
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.
130 #define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
134 * The caller wants this memory region treated as if it had a valid
138 #define VM_PROT_TRUSTED ((vm_prot_t) 0x20)
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.
146 #define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
148 #endif /* _MACH_VM_PROT_H_ */