xnu-6153.121.1.tar.gz

[apple/xnu.git] / osfmk / mach / vm_behavior.h

diff --git a/osfmk/mach/vm_behavior.h b/osfmk/mach/vm_behavior.h
index 31431769bbf22662d7cc595c934b3d861bb26398..727980d51e3063b48f8e5c0e36b3a7f4bd0de247 100644 (file)
--- a/osfmk/mach/vm_behavior.h
+++ b/osfmk/mach/vm_behavior.h
@@ -1,17 +1,20 @@
 /*
  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -19,8 +22,8 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
- * 
- * @APPLE_LICENSE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * @OSF_COPYRIGHT@
@@ -32,7 +35,7 @@
  *
  */
 
-#ifndef        _MACH_VM_BEHAVIOR_H_
+#ifndef _MACH_VM_BEHAVIOR_H_
 #define _MACH_VM_BEHAVIOR_H_
 
 /*
@@ -41,21 +44,36 @@
  *     vm_behavior_t   behavior codes.
  */
 
-typedef int            vm_behavior_t;
+typedef int             vm_behavior_t;
 
 /*
  *     Enumeration of valid values for vm_behavior_t.
- *     These describe expected page reference behavior for 
- *     for a given range of virtual memory.  For implementation 
+ *     These describe expected page reference behavior for
+ *     for a given range of virtual memory.  For implementation
  *     details see vm/vm_fault.c
  */
 
 
-#define VM_BEHAVIOR_DEFAULT    ((vm_behavior_t) 0)     /* default */
-#define VM_BEHAVIOR_RANDOM     ((vm_behavior_t) 1)     /* random */
-#define VM_BEHAVIOR_SEQUENTIAL ((vm_behavior_t) 2)     /* forward sequential */
-#define VM_BEHAVIOR_RSEQNTL    ((vm_behavior_t) 3)     /* reverse sequential */
-#define VM_BEHAVIOR_WILLNEED   ((vm_behavior_t) 4)     /* will need in near future */
-#define VM_BEHAVIOR_DONTNEED   ((vm_behavior_t) 5)     /* dont need in near future */
+/*
+ * The following behaviors affect the memory region's future behavior
+ * and are stored in the VM map entry data structure.
+ */
+#define VM_BEHAVIOR_DEFAULT     ((vm_behavior_t) 0)     /* default */
+#define VM_BEHAVIOR_RANDOM      ((vm_behavior_t) 1)     /* random */
+#define VM_BEHAVIOR_SEQUENTIAL  ((vm_behavior_t) 2)     /* forward sequential */
+#define VM_BEHAVIOR_RSEQNTL     ((vm_behavior_t) 3)     /* reverse sequential */
+
+/*
+ * The following "behaviors" affect the memory region only at the time of the
+ * call and are not stored in the VM map entry.
+ */
+#define VM_BEHAVIOR_WILLNEED    ((vm_behavior_t) 4)     /* will need in near future */
+#define VM_BEHAVIOR_DONTNEED    ((vm_behavior_t) 5)     /* dont need in near future */
+#define VM_BEHAVIOR_FREE        ((vm_behavior_t) 6)     /* free memory without write-back */
+#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 */
+#define VM_BEHAVIOR_REUSABLE    ((vm_behavior_t) 8)
+#define VM_BEHAVIOR_REUSE       ((vm_behavior_t) 9)
+#define VM_BEHAVIOR_CAN_REUSE   ((vm_behavior_t) 10)
+#define VM_BEHAVIOR_PAGEOUT     ((vm_behavior_t) 11)
 
-#endif /*_MACH_VM_BEHAVIOR_H_*/
+#endif  /*_MACH_VM_BEHAVIOR_H_*/