uvm_pager.h revision 1.9.4.1
1 /* $NetBSD: uvm_pager.h,v 1.9.4.1 1999/06/07 04:25:37 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 #ifndef _UVM_UVM_PAGER_H_ 38 #define _UVM_UVM_PAGER_H_ 39 40 #include <sys/buf.h> 41 42 /* 43 * uvm_pager.h 44 */ 45 46 /* 47 * async pager i/o descriptor structure 48 */ 49 50 TAILQ_HEAD(uvm_aiohead, uvm_aiodesc); 51 52 struct uvm_aiodesc { 53 void (*aiodone) __P((struct uvm_aiodesc *)); 54 /* aio done function */ 55 vaddr_t kva; /* KVA of mapped page(s) */ 56 int npages; /* # of pages in I/O req */ 57 void *pd_ptr; /* pager-dependent pointer */ 58 int flags; /* misc flags */ 59 TAILQ_ENTRY(uvm_aiodesc) aioq; /* linked list of aio's */ 60 }; 61 62 #define UVM_AIO_PAGEDAEMON 0x0001 /* i/o is from pagedaemon */ 63 64 struct uvm_aiobuf { 65 struct buf buf; 66 struct uvm_aiodesc aio; 67 }; 68 69 /* 70 * pager ops 71 */ 72 73 struct uvm_pagerops { 74 void (*pgo_init) __P((void));/* init pager */ 75 void (*pgo_reference) /* add reference to obj */ 76 __P((struct uvm_object *)); 77 void (*pgo_detach) /* drop reference to obj */ 78 __P((struct uvm_object *)); 79 int (*pgo_fault) /* special nonstd fault fn */ 80 __P((struct uvm_faultinfo *, vaddr_t, 81 vm_page_t *, int, int, vm_fault_t, 82 vm_prot_t, int)); 83 boolean_t (*pgo_flush) /* flush pages out of obj */ 84 __P((struct uvm_object *, vaddr_t, 85 vaddr_t, int)); 86 int (*pgo_get) /* get/read page */ 87 __P((struct uvm_object *, vaddr_t, 88 vm_page_t *, int *, int, vm_prot_t, int, int)); 89 int (*pgo_asyncget) /* start async get */ 90 __P((struct uvm_object *, vaddr_t, int)); 91 int (*pgo_put) /* put/write page */ 92 __P((struct uvm_object *, vm_page_t *, 93 int, boolean_t)); 94 void (*pgo_cluster) /* return range of cluster */ 95 __P((struct uvm_object *, vaddr_t, vaddr_t *, 96 vaddr_t *)); 97 struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */ 98 __P((struct uvm_object *, struct vm_page **, 99 int *, struct vm_page *, int, vaddr_t, 100 vaddr_t)); 101 void (*pgo_shareprot) /* share protect */ 102 __P((vm_map_entry_t, vm_prot_t)); 103 void (*pgo_aiodone) /* async iodone */ 104 __P((struct uvm_aiodesc *)); 105 boolean_t (*pgo_releasepg) /* release page */ 106 __P((struct vm_page *, struct vm_page **)); 107 }; 108 109 /* pager flags [mostly for flush] */ 110 111 #define PGO_CLEANIT 0x001 /* write dirty pages to backing store */ 112 #define PGO_SYNCIO 0x002 /* if PGO_CLEAN: use sync I/O? */ 113 /* 114 * obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages 115 * stay where they are. 116 */ 117 #define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */ 118 #define PGO_FREE 0x008 /* free flushed pages */ 119 120 #define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */ 121 #define PGO_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */ 122 #define PGO_LOCKED 0x040 /* fault data structures are locked [get] */ 123 #define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */ 124 #define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */ 125 126 #define PGO_OVERWRITE 0x200 /* page will be overwritten immediately */ 127 128 /* page we are not interested in getting */ 129 #define PGO_DONTCARE ((struct vm_page *) -1) /* [get only] */ 130 131 /* 132 * handle inline options 133 */ 134 135 #ifdef UVM_PAGER_INLINE 136 #define PAGER_INLINE static __inline 137 #else 138 #define PAGER_INLINE /* nothing */ 139 #endif /* UVM_PAGER_INLINE */ 140 141 /* 142 * prototypes 143 */ 144 145 void uvm_pager_dropcluster __P((struct uvm_object *, 146 struct vm_page *, struct vm_page **, 147 int *, int, int)); 148 void uvm_pager_init __P((void)); 149 int uvm_pager_put __P((struct uvm_object *, struct vm_page *, 150 struct vm_page ***, int *, int, 151 vaddr_t, vaddr_t)); 152 153 PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t)); 154 155 vaddr_t uvm_pagermapin __P((struct vm_page **, int, 156 struct uvm_aiodesc **, int)); 157 void uvm_pagermapout __P((vaddr_t, int)); 158 struct vm_page **uvm_mk_pcluster __P((struct uvm_object *, struct vm_page **, 159 int *, struct vm_page *, int, 160 vaddr_t, vaddr_t)); 161 void uvm_shareprot __P((vm_map_entry_t, vm_prot_t)); 162 163 164 #endif /* _UVM_UVM_PAGER_H_ */ 165
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