1 /* $NetBSD: uvm_pager.h,v 1.39 2010/09/01 16:56:19 chs Exp $ */ 2 3 /* 4 * 5 * Copyright (c) 1997 Charles D. Cranor and Washington University. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles D. Cranor and 19 * Washington University. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * from: Id: uvm_pager.h,v 1.1.2.14 1998/01/13 19:00:50 chuck Exp 35 */ 36 37 /* 38 * Copyright (c) 1991, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * the Systems Programming Group of the University of Utah Computer 43 * Science Department. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 * 69 * @(#)vm_pager.h 8.5 (Berkeley) 7/7/94 70 */ 71 72 /* 73 * Copyright (c) 1990 University of Utah. 74 * 75 * This code is derived from software contributed to Berkeley by 76 * the Systems Programming Group of the University of Utah Computer 77 * Science Department. 78 * 79 * Redistribution and use in source and binary forms, with or without 80 * modification, are permitted provided that the following conditions 81 * are met: 82 * 1. Redistributions of source code must retain the above copyright 83 * notice, this list of conditions and the following disclaimer. 84 * 2. Redistributions in binary form must reproduce the above copyright 85 * notice, this list of conditions and the following disclaimer in the 86 * documentation and/or other materials provided with the distribution. 87 * 3. All advertising materials mentioning features or use of this software 88 * must display the following acknowledgement: 89 * This product includes software developed by the University of 90 * California, Berkeley and its contributors. 91 * 4. Neither the name of the University nor the names of its contributors 92 * may be used to endorse or promote products derived from this software 93 * without specific prior written permission. 94 * 95 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 96 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 97 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 98 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 99 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 100 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 101 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 102 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 103 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 104 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 105 * SUCH DAMAGE. 106 * 107 * @(#)vm_pager.h 8.5 (Berkeley) 7/7/94 108 */ 109 110 #ifndef _UVM_UVM_PAGER_H_ 111 #define _UVM_UVM_PAGER_H_ 112 113 /* 114 * uvm_pager.h 115 */ 116 117 /* 118 * forward structure declarations 119 */ 120 121 struct uvm_faultinfo; 122 123 /* 124 * pager ops 125 */ 126 127 struct uvm_pagerops { 128 129 /* init pager */ 130 void (*pgo_init)(void); 131 132 /* add reference to obj */ 133 void (*pgo_reference)(struct uvm_object *); 134 135 /* drop reference to obj */ 136 void (*pgo_detach)(struct uvm_object *); 137 138 /* special non-standard fault processing */ 139 int (*pgo_fault)(struct uvm_faultinfo *, vaddr_t, struct vm_page **, 140 int, int, vm_prot_t, int); 141 142 /* get/read pages */ 143 int (*pgo_get)(struct uvm_object *, voff_t, struct vm_page **, 144 int *, int, vm_prot_t, int, int); 145 146 /* put/write pages */ 147 int (*pgo_put)(struct uvm_object *, voff_t, voff_t, int); 148 }; 149 150 /* pager flags [mostly for flush] */ 151 152 #define PGO_CLEANIT 0x001 /* write dirty pages to backing store */ 153 #define PGO_SYNCIO 0x002 /* use sync I/O */ 154 #define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */ 155 #define PGO_FREE 0x008 /* free flushed pages */ 156 /* if PGO_FREE is not set then the pages stay where they are. */ 157 158 #define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */ 159 #define PGO_JOURNALLOCKED 0x020 /* journal is already locked [put] */ 160 #define PGO_LOCKED 0x040 /* fault data structures are locked [get] */ 161 #define PGO_BUSYFAIL 0x080 /* fail if a page is busy [put] */ 162 #define PGO_OVERWRITE 0x200 /* pages will be overwritten before unlocked */ 163 #define PGO_PASTEOF 0x400 /* allow allocation of pages past EOF */ 164 #define PGO_NOBLOCKALLOC 0x800 /* backing block allocation is not needed */ 165 #define PGO_NOTIMESTAMP 0x1000 /* don't mark object accessed/modified */ 166 #define PGO_RECLAIM 0x2000 /* object is being reclaimed */ 167 #define PGO_GLOCKHELD 0x4000 /* genfs_node's lock is already held */ 168 169 /* page we are not interested in getting */ 170 #define PGO_DONTCARE ((struct vm_page *) -1L) /* [get only] */ 171 172 #ifdef _KERNEL 173 174 /* 175 * prototypes 176 */ 177 178 void uvm_pager_init(void); 179 struct vm_page *uvm_pageratop(vaddr_t); 180 vaddr_t uvm_pagermapin(struct vm_page **, int, int); 181 void uvm_pagermapout(vaddr_t, int); 182 183 extern size_t pager_map_size; 184 185 /* Flags to uvm_pagermapin() */ 186 #define UVMPAGER_MAPIN_WAITOK 0x01 /* it's okay to wait */ 187 #define UVMPAGER_MAPIN_READ 0x02 /* device -> host */ 188 #define UVMPAGER_MAPIN_WRITE 0x00 /* host -> device (pseudo flag) */ 189 190 #endif /* _KERNEL */ 191 192 #endif /* _UVM_UVM_PAGER_H_ */ 193