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
47typedef 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 *  When making a new VM_BEHAVIOR_*, update tests vm_parameter_validation_[user|kern]
56 *  and their expected results; they deliberately call VM functions with invalid
57 *  behavior values and you may be turning one of those invalid behaviors valid.
58 */
59
60
61/*
62 * The following behaviors affect the memory region's future behavior
63 * and are stored in the VM map entry data structure.
64 */
65#define VM_BEHAVIOR_DEFAULT     ((vm_behavior_t) 0)     /* default */
66#define VM_BEHAVIOR_RANDOM      ((vm_behavior_t) 1)     /* random */
67#define VM_BEHAVIOR_SEQUENTIAL  ((vm_behavior_t) 2)     /* forward sequential */
68#define VM_BEHAVIOR_RSEQNTL     ((vm_behavior_t) 3)     /* reverse sequential */
69
70/*
71 * The following "behaviors" affect the memory region only at the time of the
72 * call and are not stored in the VM map entry.
73 */
74#define VM_BEHAVIOR_WILLNEED    ((vm_behavior_t) 4)     /* will need in near future */
75#define VM_BEHAVIOR_DONTNEED    ((vm_behavior_t) 5)     /* dont need in near future */
76#define VM_BEHAVIOR_FREE        ((vm_behavior_t) 6)     /* free memory without write-back */
77#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 */
78#define VM_BEHAVIOR_REUSABLE    ((vm_behavior_t) 8)
79#define VM_BEHAVIOR_REUSE       ((vm_behavior_t) 9)
80#define VM_BEHAVIOR_CAN_REUSE   ((vm_behavior_t) 10)
81#define VM_BEHAVIOR_PAGEOUT     ((vm_behavior_t) 11)   /* force page-out of the pages in range (development only) */
82#define VM_BEHAVIOR_ZERO        ((vm_behavior_t) 12)   /* zero pages without faulting in additional pages */
83
84#define VM_BEHAVIOR_LAST_VALID (VM_BEHAVIOR_ZERO)
85
86#endif  /*_MACH_VM_BEHAVIOR_H_*/