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1c79356b | 1 | /* |
9bccf70c | 2 | * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. |
1c79356b | 3 | * |
2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
1c79356b | 5 | * |
2d21ac55 A |
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. | |
8f6c56a5 | 14 | * |
2d21ac55 A |
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 | |
8f6c56a5 A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
2d21ac55 A |
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. | |
8f6c56a5 | 25 | * |
2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
1c79356b A |
27 | */ |
28 | /* | |
29 | * @OSF_COPYRIGHT@ | |
30 | */ | |
1c79356b A |
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 | ||
91447636 A |
66 | #ifndef _MACH_VM_PROT_H_ |
67 | #define _MACH_VM_PROT_H_ | |
1c79356b A |
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 | */ | |
91447636 | 105 | |
1c79356b A |
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 | */ | |
91447636 | 115 | |
1c79356b A |
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 | */ | |
91447636 | 129 | |
1c79356b A |
130 | #define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10) |
131 | ||
6d2010ae | 132 | #ifdef PRIVATE |
b7266188 A |
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) | |
6d2010ae | 139 | #endif /* PRIVATE */ |
b7266188 | 140 | |
6d2010ae A |
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) | |
b7266188 | 147 | |
39037602 A |
148 | /* |
149 | * Another invalid protection value to support execute-only protection. | |
150 | * VM_PROT_STRIP_READ is a special marker that tells mprotect to not | |
151 | * set VM_PROT_READ. We have to do it this way because existing code | |
152 | * expects the system to set VM_PROT_READ if VM_PROT_EXECUTE is set. | |
153 | * VM_PROT_EXECUTE_ONLY is just a convenience value to indicate that | |
154 | * the memory should be executable and explicitly not readable. It will | |
155 | * be ignored on platforms that do not support this type of protection. | |
156 | */ | |
157 | #define VM_PROT_STRIP_READ ((vm_prot_t) 0x80) | |
158 | #define VM_PROT_EXECUTE_ONLY (VM_PROT_EXECUTE|VM_PROT_STRIP_READ) | |
159 | ||
91447636 | 160 | #endif /* _MACH_VM_PROT_H_ */ |