osfmk/mach/vm_behavior.h

   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
  78 #endif  /*_MACH_VM_BEHAVIOR_H_*/