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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: * Mach Operating System
27: * Copyright (c) 1991,1990,1989 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50: /*
51: */
52:
53: #ifndef VM_VM_EXTERNAL_H_
54: #define VM_VM_EXTERNAL_H_
55:
56: #include <mach/boolean.h>
57: #include <mach/machine/vm_types.h>
58:
59: /*
60: * External page management hint technology
61: *
62: * The data structure exported by this module maintains
63: * a (potentially incomplete) map of the pages written
64: * to external storage for a range of virtual memory.
65: */
66:
67: typedef char *vm_external_map_t;
68: #define VM_EXTERNAL_NULL ((char *) 0)
69:
70: /*
71: * The states that may be recorded for a page of external storage.
72: */
73:
74: typedef int vm_external_state_t;
75: #define VM_EXTERNAL_STATE_EXISTS 1
76: #define VM_EXTERNAL_STATE_UNKNOWN 2
77: #define VM_EXTERNAL_STATE_ABSENT 3
78:
79: /*
80: * Useful macros
81: */
82: #define stob(s) ((atop((s)) + 07) >> 3)
83:
84: /*
85: * Routines exported by this module.
86: */
87: /* Initialize the module */
88: extern void vm_external_module_initialize(void);
89:
90:
91: extern vm_external_map_t vm_external_create(
92: /* Create a vm_external_map_t */
93: vm_offset_t size);
94:
95: extern void vm_external_destroy(
96: /* Destroy one */
97: vm_external_map_t map,
98: vm_size_t size);
99:
100: extern vm_size_t vm_external_map_size(
101: /* Return size of map in bytes */
102: vm_offset_t size);
103:
104: extern void vm_external_copy(
105: /* Copy one into another */
106: vm_external_map_t old_map,
107: vm_size_t old_size,
108: vm_external_map_t new_map);
109:
110: extern void vm_external_state_set(
111: /* Set state of a page to
112: * VM_EXTERNAL_STATE_EXISTS */
113: vm_external_map_t map,
114: vm_offset_t offset);
115:
116: extern void vm_external_state_clr(
117: /* clear page state
118: */
119: vm_external_map_t map,
120: vm_offset_t offset);
121:
122: #define vm_external_state_get(map, offset) \
123: (((map) != VM_EXTERNAL_NULL) ? \
124: _vm_external_state_get((map), (offset)) : \
125: VM_EXTERNAL_STATE_UNKNOWN)
126: /* Retrieve the state for a
127: * given page, if known. */
128:
129: extern vm_external_state_t _vm_external_state_get(
130: /* HIDDEN routine */
131: vm_external_map_t map,
132: vm_offset_t offset);
133:
134: boolean_t vm_external_within(
135: /* Check if new object size
136: * fits in current map */
137: vm_size_t new_size,
138: vm_size_t old_size);
139: #endif /* VM_VM_EXTERNAL_H_ */
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