uvm_pager.h revision 1.7.2.3
1 /* $NetBSD: uvm_pager.h,v 1.7.2.3 1999/05/30 15:34:45 chs 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 #include <sys/buf.h> 45 46 /* 47 * uvm_pager.h 48 */ 49 50 /* 51 * async pager i/o descriptor structure 52 */ 53 54 TAILQ_HEAD(uvm_aiohead, uvm_aiodesc); 55 56 struct uvm_aiodesc { 57 void (*aiodone) __P((struct uvm_aiodesc *)); 58 /* aio done function */ 59 vaddr_t kva; /* KVA of mapped page(s) */ 60 int npages; /* # of pages in I/O req */ 61 void *pd_ptr; /* pager-dependent pointer */ 62 int flags; /* misc flags */ 63 TAILQ_ENTRY(uvm_aiodesc) aioq; /* linked list of aio's */ 64 }; 65 66 #define UVM_AIO_PAGEDAEMON 0x0001 /* i/o is from pagedaemon */ 67 68 struct uvm_aiobuf { 69 struct buf buf; 70 struct uvm_aiodesc aio; 71 }; 72 73 /* 74 * pager ops 75 */ 76 77 struct uvm_pagerops { 78 void (*pgo_init) __P((void));/* init pager */ 79 struct uvm_object * (*pgo_attach) /* get uvm_object */ 80 __P((void *, vm_prot_t)); 81 void (*pgo_reference) /* add reference to obj */ 82 __P((struct uvm_object *)); 83 void (*pgo_detach) /* drop reference to obj */ 84 __P((struct uvm_object *)); 85 int (*pgo_fault) /* special nonstd fault fn */ 86 __P((struct uvm_faultinfo *, vaddr_t, 87 vm_page_t *, int, int, vm_fault_t, 88 vm_prot_t, int)); 89 boolean_t (*pgo_flush) /* flush pages out of obj */ 90 __P((struct uvm_object *, vaddr_t, 91 vaddr_t, int)); 92 int (*pgo_get) /* get/read page */ 93 __P((struct uvm_object *, vaddr_t, 94 vm_page_t *, int *, int, vm_prot_t, int, int)); 95 int (*pgo_asyncget) /* start async get */ 96 __P((struct uvm_object *, vaddr_t, int)); 97 int (*pgo_put) /* put/write page */ 98 __P((struct uvm_object *, vm_page_t *, 99 int, boolean_t)); 100 void (*pgo_cluster) /* return range of cluster */ 101 __P((struct uvm_object *, vaddr_t, vaddr_t *, 102 vaddr_t *)); 103 struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */ 104 __P((struct uvm_object *, struct vm_page **, 105 int *, struct vm_page *, int, vaddr_t, 106 vaddr_t)); 107 void (*pgo_shareprot) /* share protect */ 108 __P((vm_map_entry_t, vm_prot_t)); 109 void (*pgo_aiodone) /* async iodone */ 110 __P((struct uvm_aiodesc *)); 111 boolean_t (*pgo_releasepg) /* release page */ 112 __P((struct vm_page *, struct vm_page **)); 113 }; 114 115 /* pager flags [mostly for flush] */ 116 117 #define PGO_CLEANIT 0x001 /* write dirty pages to backing store */ 118 #define PGO_SYNCIO 0x002 /* if PGO_CLEAN: use sync I/O? */ 119 /* 120 * obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages 121 * stay where they are. 122 */ 123 #define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */ 124 #define PGO_FREE 0x008 /* free flushed pages */ 125 126 #define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */ 127 #define PGO_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */ 128 #define PGO_LOCKED 0x040 /* fault data structures are locked [get] */ 129 #define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */ 130 #define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */ 131 132 #define PGO_OVERWRITE 0x200 /* page will be overwritten immediately */ 133 134 /* page we are not interested in getting */ 135 #define PGO_DONTCARE ((struct vm_page *) -1) /* [get only] */ 136 137 /* 138 * handle inline options 139 */ 140 141 #ifdef UVM_PAGER_INLINE 142 #define PAGER_INLINE static __inline 143 #else 144 #define PAGER_INLINE /* nothing */ 145 #endif /* UVM_PAGER_INLINE */ 146 147 /* 148 * prototypes 149 */ 150 151 void uvm_pager_dropcluster __P((struct uvm_object *, 152 struct vm_page *, struct vm_page **, 153 int *, int, int)); 154 void uvm_pager_init __P((void)); 155 int uvm_pager_put __P((struct uvm_object *, struct vm_page *, 156 struct vm_page ***, int *, int, 157 vaddr_t, vaddr_t)); 158 159 PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t)); 160 161 vaddr_t uvm_pagermapin __P((struct vm_page **, int, 162 struct uvm_aiodesc **, int)); 163 void uvm_pagermapout __P((vaddr_t, int)); 164 struct vm_page **uvm_mk_pcluster __P((struct uvm_object *, struct vm_page **, 165 int *, struct vm_page *, int, 166 vaddr_t, vaddr_t)); 167 void uvm_shareprot __P((vm_map_entry_t, vm_prot_t)); 168 169 170 #endif /* _UVM_UVM_PAGER_H_ */ 171
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