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 | * @(#)device_pager.h 7.1 (Berkeley) 12/5/90 | |
| 39 | */ | |
| 40 | ||
| 41 | #ifndef _DEVICE_PAGER_ | |
| 42 | #define _DEVICE_PAGER_ 1 | |
| 43 | ||
| 44 | /* | |
| 45 | * Device pager private data. | |
| 46 | */ | |
| 47 | struct devpager { | |
| 48 | queue_head_t devp_list; /* list of managed devices */ | |
| 49 | dev_t devp_dev; /* devno of device */ | |
| 50 | vm_page_t devp_pages; /* page structs for device */ | |
| 51 | int devp_npages; /* size of device in pages */ | |
| 52 | int devp_count; /* reference count */ | |
| 53 | vm_object_t devp_object; /* object representing this device */ | |
| 54 | }; | |
| 55 | typedef struct devpager *dev_pager_t; | |
| 56 | ||
| 57 | #define DEV_PAGER_NULL ((dev_pager_t)0) | |
| 58 | ||
| 59 | #ifdef KERNEL | |
| 60 | ||
| 61 | void dev_pager_init(); | |
| 62 | vm_pager_t dev_pager_alloc(); | |
| 63 | void dev_pager_dealloc(); | |
| 64 | boolean_t dev_pager_getpage(), dev_pager_putpage(); | |
| 65 | boolean_t dev_pager_haspage(); | |
| 66 | ||
| 67 | struct pagerops devicepagerops = { | |
| 68 | dev_pager_init, | |
| 69 | dev_pager_alloc, | |
| 70 | dev_pager_dealloc, | |
| 71 | dev_pager_getpage, | |
| 72 | dev_pager_putpage, | |
| 73 | dev_pager_haspage | |
| 74 | }; | |
| 75 | ||
| 76 | #endif | |
| 77 | ||
| 78 | #endif /* _DEVICE_PAGER_ */ |