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619edcce KM |
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 | * %sccs.include.redist.c% | |
11 | * | |
12 | * @(#)vm_pager.h 7.1 (Berkeley) %G% | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Pager routine interface definition. | |
17 | * For BSD we use a cleaner version of the internal pager interface. | |
18 | */ | |
19 | ||
20 | #ifndef _VM_PAGER_ | |
21 | #define _VM_PAGER_ | |
22 | ||
23 | #ifdef KERNEL | |
24 | #include "types.h" | |
25 | #include "queue.h" | |
26 | #else | |
27 | #include <sys/types.h> | |
28 | #include <sys/queue.h> | |
29 | #endif | |
30 | ||
31 | struct pager_struct { | |
32 | queue_head_t pg_list; /* links for list management */ | |
33 | caddr_t pg_handle; /* external handle (vp, dev, fp) */ | |
34 | int pg_type; /* type of pager */ | |
35 | struct pagerops *pg_ops; /* pager operations */ | |
36 | caddr_t pg_data; /* private pager data */ | |
37 | }; | |
38 | typedef struct pager_struct *vm_pager_t; | |
39 | ||
40 | #define vm_pager_null ((vm_pager_t) 0) /* XXX MACH compat */ | |
41 | #define VM_PAGER_NULL ((vm_pager_t) 0) | |
42 | ||
43 | /* pager types */ | |
44 | #define PG_DFLT -1 | |
45 | #define PG_SWAP 0 | |
46 | #define PG_VNODE 1 | |
47 | #define PG_DEVICE 2 | |
48 | ||
49 | struct pagerops { | |
50 | void (*pgo_init)(); /* initialize pager */ | |
51 | vm_pager_t (*pgo_alloc)(); /* allocate pager */ | |
52 | void (*pgo_dealloc)(); /* disassociate */ | |
53 | int (*pgo_getpage)(); /* get (read) page */ | |
54 | int (*pgo_putpage)(); /* put (write) page */ | |
55 | boolean_t (*pgo_haspage)(); /* does pager have page? */ | |
56 | }; | |
57 | #define PAGER_OPS_NULL ((struct pagerops *)0) | |
58 | ||
59 | /* | |
60 | * get/put return values | |
61 | * OK operation was successful | |
62 | * BAD specified data was out of the accepted range | |
63 | * FAIL specified data was in range, but doesn't exist | |
64 | * PEND operations was initiated but not completed | |
65 | */ | |
66 | #define VM_PAGER_OK 0 | |
67 | #define VM_PAGER_BAD 1 | |
68 | #define VM_PAGER_FAIL 2 | |
69 | #define VM_PAGER_PEND 3 | |
70 | ||
71 | #define VM_PAGER_ALLOC(h, s, p) (*(pg)->pg_ops->pgo_alloc)(h, s, p) | |
72 | #define VM_PAGER_DEALLOC(pg) (*(pg)->pg_ops->pgo_dealloc)(pg) | |
73 | #define VM_PAGER_GET(pg, m, s) (*(pg)->pg_ops->pgo_getpage)(pg, m, s) | |
74 | #define VM_PAGER_PUT(pg, m, s) (*(pg)->pg_ops->pgo_putpage)(pg, m, s) | |
75 | #define VM_PAGER_HASPAGE(pg, o) (*(pg)->pg_ops->pgo_haspage)(pg, o) | |
76 | ||
77 | #ifdef KERNEL | |
78 | vm_pager_t vm_pager_allocate(); | |
79 | void vm_pager_deallocate(); | |
80 | int vm_pager_get(); | |
81 | int vm_pager_put(); | |
82 | boolean_t vm_pager_has_page(); | |
83 | ||
84 | vm_offset_t vm_pager_map_page(); | |
85 | void vm_pager_unmap_page(); | |
86 | vm_pager_t vm_pager_lookup(); | |
87 | void vm_pager_sync(); | |
88 | ||
89 | extern struct pagerops *dfltpagerops; | |
90 | #endif | |
91 | ||
92 | #endif /* _VM_PAGER_ */ |