FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pager.h
1 /*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)vm_pager.h 8.4 (Berkeley) 1/12/94
39 * $FreeBSD: src/sys/vm/vm_pager.h,v 1.11.4.1 1999/09/05 08:24:39 peter Exp $
40 */
41
42 /*
43 * Pager routine interface definition.
44 */
45
46 #ifndef _VM_PAGER_
47 #define _VM_PAGER_
48
49 TAILQ_HEAD(pagerlst, vm_object);
50
51 struct pagerops {
52 void (*pgo_init) __P((void)); /* Initialize pager. */
53 vm_object_t (*pgo_alloc) __P((void *, vm_size_t, vm_prot_t, vm_ooffset_t)); /* Allocate pager. */
54 void (*pgo_dealloc) __P((vm_object_t)); /* Disassociate. */
55 int (*pgo_getpages) __P((vm_object_t, vm_page_t *, int, int)); /* Get (read) page. */
56 int (*pgo_putpages) __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); /* Put (write) page. */
57 boolean_t (*pgo_haspage) __P((vm_object_t, vm_pindex_t, int *, int *)); /* Does pager have page? */
58 void (*pgo_sync) __P((void));
59 };
60
61 /*
62 * get/put return values
63 * OK operation was successful
64 * BAD specified data was out of the accepted range
65 * FAIL specified data was in range, but doesn't exist
66 * PEND operations was initiated but not completed
67 * ERROR error while accessing data that is in range and exists
68 * AGAIN temporary resource shortage prevented operation from happening
69 */
70 #define VM_PAGER_OK 0
71 #define VM_PAGER_BAD 1
72 #define VM_PAGER_FAIL 2
73 #define VM_PAGER_PEND 3
74 #define VM_PAGER_ERROR 4
75 #define VM_PAGER_AGAIN 5
76
77 #ifdef KERNEL
78 extern vm_map_t pager_map;
79 extern int pager_map_size;
80
81 vm_object_t vm_pager_allocate __P((objtype_t, void *, vm_size_t, vm_prot_t, vm_ooffset_t));
82 void vm_pager_bufferinit __P((void));
83 void vm_pager_deallocate __P((vm_object_t));
84 int vm_pager_get_pages __P((vm_object_t, vm_page_t *, int, int));
85 boolean_t vm_pager_has_page __P((vm_object_t, vm_pindex_t, int *, int *));
86 void vm_pager_init __P((void));
87 vm_object_t vm_pager_object_lookup __P((struct pagerlst *, void *));
88 vm_offset_t vm_pager_map_pages __P((vm_page_t *, int, boolean_t));
89 vm_offset_t vm_pager_map_page __P((vm_page_t));
90 int vm_pager_put_pages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
91 void vm_pager_sync __P((void));
92 void vm_pager_unmap_pages __P((vm_offset_t, int));
93 void vm_pager_unmap_page __P((vm_offset_t));
94 #endif
95
96 #endif /* _VM_PAGER_ */
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