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 | * File: mach/vm_behavior.h |
33 | * |
34 | * Virtual memory map behavior definitions. |
35 | * |
36 | */ |
37 | |
38 | #ifndef _MACH_VM_BEHAVIOR_H_ |
39 | #define _MACH_VM_BEHAVIOR_H_ |
40 | |
41 | /* |
42 | * Types defined: |
43 | * |
44 | * vm_behavior_t behavior codes. |
45 | */ |
46 | |
47 | typedef int vm_behavior_t; |
48 | |
49 | /* |
50 | * Enumeration of valid values for vm_behavior_t. |
51 | * These describe expected page reference behavior for |
52 | * for a given range of virtual memory. For implementation |
53 | * details see vm/vm_fault.c |
54 | */ |
55 | |
56 | |
57 | /* |
58 | * The following behaviors affect the memory region's future behavior |
59 | * and are stored in the VM map entry data structure. |
60 | */ |
61 | #define VM_BEHAVIOR_DEFAULT ((vm_behavior_t) 0) /* default */ |
62 | #define VM_BEHAVIOR_RANDOM ((vm_behavior_t) 1) /* random */ |
63 | #define VM_BEHAVIOR_SEQUENTIAL ((vm_behavior_t) 2) /* forward sequential */ |
64 | #define VM_BEHAVIOR_RSEQNTL ((vm_behavior_t) 3) /* reverse sequential */ |
65 | |
66 | /* |
67 | * The following "behaviors" affect the memory region only at the time of the |
68 | * call and are not stored in the VM map entry. |
69 | */ |
70 | #define VM_BEHAVIOR_WILLNEED ((vm_behavior_t) 4) /* will need in near future */ |
71 | #define VM_BEHAVIOR_DONTNEED ((vm_behavior_t) 5) /* dont need in near future */ |
72 | #define VM_BEHAVIOR_FREE ((vm_behavior_t) 6) /* free memory without write-back */ |
73 | #define VM_BEHAVIOR_ZERO_WIRED_PAGES ((vm_behavior_t) 7) /* zero out the wired pages of an entry if it is being deleted without unwiring them first */ |
74 | #define VM_BEHAVIOR_REUSABLE ((vm_behavior_t) 8) |
75 | #define VM_BEHAVIOR_REUSE ((vm_behavior_t) 9) |
76 | #define VM_BEHAVIOR_CAN_REUSE ((vm_behavior_t) 10) |
77 | #define VM_BEHAVIOR_PAGEOUT ((vm_behavior_t) 11) |
78 | #define VM_BEHAVIOR_ZERO ((vm_behavior_t) 12) /* zero pages without faulting in additional pages */ |
79 | |
80 | #endif /*_MACH_VM_BEHAVIOR_H_*/ |
81 | |