uvm_pager.h revision 1.8
1 /* $NetBSD: uvm_pager.h,v 1.8 1999/03/24 03:45:28 cgd 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 vaddr_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 void (*pgo_reference) /* add reference to obj */ 70 __P((struct uvm_object *)); 71 void (*pgo_detach) /* drop reference to obj */ 72 __P((struct uvm_object *)); 73 int (*pgo_fault) /* special nonstd fault fn */ 74 __P((struct uvm_faultinfo *, vaddr_t, 75 vm_page_t *, int, int, vm_fault_t, 76 vm_prot_t, int)); 77 boolean_t (*pgo_flush) /* flush pages out of obj */ 78 __P((struct uvm_object *, vaddr_t, 79 vaddr_t, int)); 80 int (*pgo_get) /* get/read page */ 81 __P((struct uvm_object *, vaddr_t, 82 vm_page_t *, int *, int, vm_prot_t, int, int)); 83 int (*pgo_asyncget) /* start async get */ 84 __P((struct uvm_object *, vaddr_t, int)); 85 int (*pgo_put) /* put/write page */ 86 __P((struct uvm_object *, vm_page_t *, 87 int, boolean_t)); 88 void (*pgo_cluster) /* return range of cluster */ 89 __P((struct uvm_object *, vaddr_t, vaddr_t *, 90 vaddr_t *)); 91 struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */ 92 __P((struct uvm_object *, struct vm_page **, 93 int *, struct vm_page *, int, vaddr_t, 94 vaddr_t)); 95 void (*pgo_shareprot) /* share protect */ 96 __P((vm_map_entry_t, vm_prot_t)); 97 void (*pgo_aiodone) /* async iodone */ 98 __P((struct uvm_aiodesc *)); 99 boolean_t (*pgo_releasepg) /* release page */ 100 __P((struct vm_page *, struct vm_page **)); 101 }; 102 103 /* pager flags [mostly for flush] */ 104 105 #define PGO_CLEANIT 0x001 /* write dirty pages to backing store */ 106 #define PGO_SYNCIO 0x002 /* if PGO_CLEAN: use sync I/O? */ 107 /* 108 * obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages 109 * stay where they are. 110 */ 111 #define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */ 112 #define PGO_FREE 0x008 /* free flushed pages */ 113 114 #define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */ 115 #define PGO_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */ 116 #define PGO_LOCKED 0x040 /* fault data structures are locked [get] */ 117 #define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */ 118 #define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */ 119 120 /* page we are not interested in getting */ 121 #define PGO_DONTCARE ((struct vm_page *) -1) /* [get only] */ 122 123 /* 124 * handle inline options 125 */ 126 127 #ifdef UVM_PAGER_INLINE 128 #define PAGER_INLINE static __inline 129 #else 130 #define PAGER_INLINE /* nothing */ 131 #endif /* UVM_PAGER_INLINE */ 132 133 /* 134 * prototypes 135 */ 136 137 void uvm_pager_dropcluster __P((struct uvm_object *, 138 struct vm_page *, struct vm_page **, 139 int *, int, int)); 140 void uvm_pager_init __P((void)); 141 int uvm_pager_put __P((struct uvm_object *, struct vm_page *, 142 struct vm_page ***, int *, int, 143 vaddr_t, vaddr_t)); 144 145 PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t)); 146 147 vaddr_t uvm_pagermapin __P((struct vm_page **, int, 148 struct uvm_aiodesc **, int)); 149 void uvm_pagermapout __P((vaddr_t, int)); 150 struct vm_page **uvm_mk_pcluster __P((struct uvm_object *, struct vm_page **, 151 int *, struct vm_page *, int, 152 vaddr_t, vaddr_t)); 153 void uvm_shareprot __P((vm_map_entry_t, vm_prot_t)); 154 155 156 #endif /* _UVM_UVM_PAGER_H_ */ 157
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