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1.1 root 1: /*
2: * Copyright (c) 1990 University of Utah.
3: * Copyright (c) 1991 The Regents of the University of California.
4: * 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 7.2 (Berkeley) 4/20/91
39: */
40:
41: /*
42: * Pager routine interface definition.
43: * For BSD we use a cleaner version of the internal pager interface.
44: */
45:
46: #ifndef _VM_PAGER_
47: #define _VM_PAGER_
48:
49: struct pager_struct {
50: queue_head_t pg_list; /* links for list management */
51: caddr_t pg_handle; /* external handle (vp, dev, fp) */
52: int pg_type; /* type of pager */
53: struct pagerops *pg_ops; /* pager operations */
54: caddr_t pg_data; /* private pager data */
55: };
56: typedef struct pager_struct *vm_pager_t;
57:
58: /* pager types */
59: #define PG_DFLT -1
60: #define PG_SWAP 0
61: #define PG_VNODE 1
62: #define PG_DEVICE 2
63:
64: struct pagerops {
65: void (*pgo_init)(); /* initialize pager */
66: vm_pager_t (*pgo_alloc)(); /* allocate pager */
67: void (*pgo_dealloc)(); /* disassociate */
68: int (*pgo_getpage)(); /* get (read) page */
69: int (*pgo_putpage)(); /* put (write) page */
70: boolean_t (*pgo_haspage)(); /* does pager have page? */
71: };
72:
73: /*
74: * get/put return values
75: * OK operation was successful
76: * BAD specified data was out of the accepted range
77: * FAIL specified data was in range, but doesn't exist
78: * PEND operations was initiated but not completed
79: */
80: #define VM_PAGER_OK 0
81: #define VM_PAGER_BAD 1
82: #define VM_PAGER_FAIL 2
83: #define VM_PAGER_PEND 3
84:
85: #define VM_PAGER_ALLOC(h, s, p) (*(pg)->pg_ops->pgo_alloc)(h, s, p)
86: #define VM_PAGER_DEALLOC(pg) (*(pg)->pg_ops->pgo_dealloc)(pg)
87: #define VM_PAGER_GET(pg, m, s) (*(pg)->pg_ops->pgo_getpage)(pg, m, s)
88: #define VM_PAGER_PUT(pg, m, s) (*(pg)->pg_ops->pgo_putpage)(pg, m, s)
89: #define VM_PAGER_HASPAGE(pg, o) (*(pg)->pg_ops->pgo_haspage)(pg, o)
90:
91: #ifdef KERNEL
92: vm_pager_t vm_pager_allocate();
93: void vm_pager_deallocate();
94: int vm_pager_get();
95: int vm_pager_put();
96: boolean_t vm_pager_has_page();
97:
98: vm_offset_t vm_pager_map_page();
99: void vm_pager_unmap_page();
100: vm_pager_t vm_pager_lookup();
101: void vm_pager_sync();
102:
103: extern struct pagerops *dfltpagerops;
104: #endif
105:
106: #endif /* _VM_PAGER_ */
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