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 * $Id: vm_pager.h,v 1.10 1995/11/20 12:19:16 phk 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_ */ 97