projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b688fc87 WJ |
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_ */ |