uvm_pager.h revision 1.6
1 /* $NetBSD: uvm_pager.h,v 1.6 1998/03/09 00:58:58 mrg Exp $ */ 2 3 /* 4 * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE! 5 * >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<< 6 */ 7 /* 8 * 9 * Copyright (c) 1997 Charles D. Cranor and Washington University. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by Charles D. Cranor and 23 * Washington University. 24 * 4. The name of the author may not be used to endorse or promote products 25 * derived from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 28 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 29 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 30 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 31 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 32 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * 38 * from: Id: uvm_pager.h,v 1.1.2.14 1998/01/13 19:00:50 chuck Exp 39 */ 40 41 #ifndef _UVM_UVM_PAGER_H_ 42 #define _UVM_UVM_PAGER_H_ 43 44 /* 45 * uvm_pager.h 46 */ 47 48 /* 49 * async pager i/o descriptor structure 50 */ 51 52 TAILQ_HEAD(uvm_aiohead, uvm_aiodesc); 53 54 struct uvm_aiodesc { 55 void (*aiodone) __P((struct uvm_aiodesc *)); 56 /* aio done function */ 57 vm_offset_t kva; /* KVA of mapped page(s) */ 58 int npages; /* # of pages in I/O req */ 59 void *pd_ptr; /* pager-dependent pointer */ 60 TAILQ_ENTRY(uvm_aiodesc) aioq; /* linked list of aio's */ 61 }; 62 63 /* 64 * pager ops 65 */ 66 67 struct uvm_pagerops { 68 void (*pgo_init) __P((void));/* init pager */ 69 struct uvm_object * (*pgo_attach) /* get uvm_object */ 70 __P((void *, vm_prot_t)); 71 void (*pgo_reference) /* add reference to obj */ 72 __P((struct uvm_object *)); 73 void (*pgo_detach) /* drop reference to obj */ 74 __P((struct uvm_object *)); 75 int (*pgo_fault) /* special nonstd fault fn */ 76 __P((struct uvm_faultinfo *, vm_offset_t, 77 vm_page_t *, int, int, vm_fault_t, 78 vm_prot_t, int)); 79 boolean_t (*pgo_flush) /* flush pages out of obj */ 80 __P((struct uvm_object *, vm_offset_t, 81 vm_offset_t, int)); 82 int (*pgo_get) /* get/read page */ 83 __P((struct uvm_object *, vm_offset_t, 84 vm_page_t *, int *, int, vm_prot_t, int, int)); 85 int (*pgo_asyncget) /* start async get */ 86 __P((struct uvm_object *, vm_offset_t, int)); 87 int (*pgo_put) /* put/write page */ 88 __P((struct uvm_object *, vm_page_t *, 89 int, boolean_t)); 90 void (*pgo_cluster) /* return range of cluster */ 91 __P((struct uvm_object *, vm_offset_t, vm_offset_t *, 92 vm_offset_t *)); 93 struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */ 94 __P((struct uvm_object *, struct vm_page **, 95 int *, struct vm_page *, int, vm_offset_t, 96 vm_offset_t)); 97 void (*pgo_shareprot) /* share protect */ 98 __P((vm_map_entry_t, vm_prot_t)); 99 void (*pgo_aiodone) /* async iodone */ 100 __P((struct uvm_aiodesc *)); 101 boolean_t (*pgo_releasepg) /* release page */ 102 __P((struct vm_page *, struct vm_page **)); 103 }; 104 105 /* pager flags [mostly for flush] */ 106 107 #define PGO_CLEANIT 0x001 /* write dirty pages to backing store */ 108 #define PGO_SYNCIO 0x002 /* if PGO_CLEAN: use sync I/O? */ 109 /* 110 * obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages 111 * stay where they are. 112 */ 113 #define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */ 114 #define PGO_FREE 0x008 /* free flushed pages */ 115 116 #define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */ 117 #define PGO_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */ 118 #define PGO_LOCKED 0x040 /* fault data structures are locked [get] */ 119 #define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */ 120 #define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */ 121 122 /* page we are not interested in getting */ 123 #define PGO_DONTCARE ((struct vm_page *) -1) /* [get only] */ 124 125 /* 126 * handle inline options 127 */ 128 129 #ifdef UVM_PAGER_INLINE 130 #define PAGER_INLINE static __inline 131 #else 132 #define PAGER_INLINE /* nothing */ 133 #endif /* UVM_PAGER_INLINE */ 134 135 /* 136 * prototypes 137 */ 138 139 void uvm_pager_dropcluster __P((struct uvm_object *, 140 struct vm_page *, struct vm_page **, 141 int *, int, int)); 142 void uvm_pager_init __P((void)); 143 int uvm_pager_put __P((struct uvm_object *, struct vm_page *, 144 struct vm_page ***, int *, int, 145 vm_offset_t, vm_offset_t)); 146 147 PAGER_INLINE struct vm_page *uvm_pageratop __P((vm_offset_t)); 148 149 vm_offset_t uvm_pagermapin __P((struct vm_page **, int, 150 struct uvm_aiodesc **, int)); 151 void uvm_pagermapout __P((vm_offset_t, int)); 152 struct vm_page **uvm_mk_pcluster __P((struct uvm_object *, struct vm_page **, 153 int *, struct vm_page *, int, 154 vm_offset_t, vm_offset_t)); 155 void uvm_shareprot __P((vm_map_entry_t, vm_prot_t)); 156 157 158 #endif /* _UVM_UVM_PAGER_H_ */ 159
Indexes created Tue Sep 23 07:09:52 GMT 2025