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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
24: */
25: /*
26: * HISTORY
27: *
28: * Revision 1.1.1.1 1998/09/22 21:05:31 wsanchez
29: * Import of Mac OS X kernel (~semeria)
30: *
31: * Revision 1.1.1.1 1998/03/07 02:25:46 wsanchez
32: * Import of OSF Mach kernel (~mburg)
33: *
34: * Revision 1.3.8.1 1994/09/23 02:44:31 ezf
35: * change marker to not FREE
36: * [1994/09/22 21:43:46 ezf]
37: *
38: * Revision 1.3.2.2 1993/06/09 02:44:23 gm
39: * Added to OSF/1 R1.3 from NMK15.0.
40: * [1993/06/02 21:18:51 jeffc]
41: *
42: * Revision 1.3 1993/04/19 16:40:48 devrcs
43: * make endif tags ansi compliant/include files
44: * [1993/02/20 21:45:25 david]
45: *
46: * Revision 1.2 1992/12/07 21:29:28 robert
47: * integrate any changes below for 14.0 (branch from 13.16 base)
48: *
49: * Joseph Barrera (jsb) at Carnegie-Mellon University 05-Aug-92
50: * Added VM_PROT_WANTS_COPY to solve copy-call race condition.
51: * [1992/12/06 20:25:47 robert]
52: *
53: * Revision 1.1 1992/09/30 02:32:28 robert
54: * Initial revision
55: *
56: * $EndLog$
57: */
58: /* CMU_HIST */
59: /*
60: * Revision 2.4.3.1 92/03/03 16:22:41 jeffreyh
61: * [David L. Black 92/02/22 17:03:43 [email protected]]
62: * Add no change protection value for memory_object_lock_request.
63: *
64: * Revision 2.4 91/05/14 17:03:00 mrt
65: * Correcting copyright
66: *
67: * Revision 2.3 91/02/05 17:37:38 mrt
68: * Changed to new Mach copyright
69: * [91/02/01 17:22:39 mrt]
70: *
71: * Revision 2.2 90/01/22 23:05:57 af
72: * Removed execute permission from default protection.
73: * On the only machine that cares for execute permission (mips)
74: * this is an expensive liability: it requires keeping
75: * Icache consistent memory that never contains code.
76: * [89/12/15 af]
77: *
78: * Revision 2.1 89/08/03 16:06:47 rwd
79: * Created.
80: *
81: * Revision 2.3 89/02/25 18:42:29 gm0w
82: * Changes for cleanup.
83: *
84: * 6-Jun-85 Avadis Tevanian (avie) at Carnegie-Mellon University
85: * Created.
86: *
87: */
88: /* CMU_ENDHIST */
89: /*
90: * Mach Operating System
91: * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
92: * All Rights Reserved.
93: *
94: * Permission to use, copy, modify and distribute this software and its
95: * documentation is hereby granted, provided that both the copyright
96: * notice and this permission notice appear in all copies of the
97: * software, derivative works or modified versions, and any portions
98: * thereof, and that both notices appear in supporting documentation.
99: *
100: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
101: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
102: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
103: *
104: * Carnegie Mellon requests users of this software to return to
105: *
106: * Software Distribution Coordinator or [email protected]
107: * School of Computer Science
108: * Carnegie Mellon University
109: * Pittsburgh PA 15213-3890
110: *
111: * any improvements or extensions that they make and grant Carnegie Mellon
112: * the rights to redistribute these changes.
113: */
114: /*
115: */
116: /*
117: * File: mach/vm_prot.h
118: * Author: Avadis Tevanian, Jr., Michael Wayne Young
119: *
120: * Virtual memory protection definitions.
121: *
122: */
123:
124: #ifndef VM_PROT_H_
125: #define VM_PROT_H_
126:
127: /*
128: * Types defined:
129: *
130: * vm_prot_t VM protection values.
131: */
132:
133: typedef int vm_prot_t;
134:
135: /*
136: * Protection values, defined as bits within the vm_prot_t type
137: */
138:
139: #define VM_PROT_NONE ((vm_prot_t) 0x00)
140:
141: #define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
142: #define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
143: #define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
144:
145: /*
146: * The default protection for newly-created virtual memory
147: */
148:
149: #define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
150:
151: /*
152: * The maximum privileges possible, for parameter checking.
153: */
154:
155: #define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
156:
157: /*
158: * An invalid protection value.
159: * Used only by memory_object_lock_request to indicate no change
160: * to page locks. Using -1 here is a bad idea because it
161: * looks like VM_PROT_ALL and then some.
162: */
163: #define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
164:
165: /*
166: * When a caller finds that he cannot obtain write permission on a
167: * mapped entry, the following flag can be used. The entry will
168: * be made "needs copy" effectively copying the object (using COW),
169: * and write permission will be added to the maximum protections
170: * for the associated entry.
171: */
172: #define VM_PROT_COPY ((vm_prot_t) 0x10)
173:
174:
175: /*
176: * Another invalid protection value.
177: * Used only by memory_object_data_request upon an object
178: * which has specified a copy_call copy strategy. It is used
179: * when the kernel wants a page belonging to a copy of the
180: * object, and is only asking the object as a result of
181: * following a shadow chain. This solves the race between pages
182: * being pushed up by the memory manager and the kernel
183: * walking down the shadow chain.
184: */
185: #define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
186:
187: #endif /* VM_PROT_H_ */
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