1 /* $NetBSD: uvm_object.h,v 1.23 2007/12/01 10:40:28 yamt 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_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp 35 */ 36 37 #ifndef _UVM_UVM_OBJECT_H_ 38 #define _UVM_UVM_OBJECT_H_ 39 40 /* 41 * uvm_object.h 42 */ 43 44 /* 45 * uvm_object: all that is left of mach objects. 46 */ 47 48 struct uvm_object { 49 struct simplelock vmobjlock; /* lock on memq */ 50 const struct uvm_pagerops *pgops; /* pager ops */ 51 struct pglist memq; /* pages in this object */ 52 int uo_npages; /* # of pages in memq */ 53 int uo_refs; /* reference count */ 54 }; 55 56 /* 57 * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the 58 * object is a kernel memory object rather than a normal one (kernel 59 * memory objects don't have reference counts -- they never die). 60 * 61 * this value is used to detected kernel object mappings at uvm_unmap() 62 * time. normally when an object is unmapped its pages eventaully become 63 * deactivated and then paged out and/or freed. this is not useful 64 * for kernel objects... when a kernel object is unmapped we always want 65 * to free the resources associated with the mapping. UVM_OBJ_KERN 66 * allows us to decide which type of unmapping we want to do. 67 */ 68 #define UVM_OBJ_KERN (-2) 69 70 #define UVM_OBJ_IS_KERN_OBJECT(uobj) \ 71 ((uobj)->uo_refs == UVM_OBJ_KERN) 72 73 #ifdef _KERNEL 74 75 extern const struct uvm_pagerops uvm_vnodeops; 76 extern const struct uvm_pagerops uvm_deviceops; 77 extern const struct uvm_pagerops ubc_pager; 78 extern const struct uvm_pagerops aobj_pager; 79 80 #define UVM_OBJ_IS_VNODE(uobj) \ 81 ((uobj)->pgops == &uvm_vnodeops) 82 83 #define UVM_OBJ_IS_DEVICE(uobj) \ 84 ((uobj)->pgops == &uvm_deviceops) 85 86 #define UVM_OBJ_IS_VTEXT(uobj) \ 87 (UVM_OBJ_IS_VNODE(uobj) && uvn_text_p(uobj)) 88 89 #define UVM_OBJ_IS_CLEAN(uobj) \ 90 (UVM_OBJ_IS_VNODE(uobj) && uvn_clean_p(uobj)) 91 92 /* 93 * UVM_OBJ_NEEDS_WRITEFAULT: true if the uobj needs to detect modification. 94 * (ie. wants to avoid writable user mappings.) 95 * 96 * XXX bad name 97 */ 98 99 #define UVM_OBJ_NEEDS_WRITEFAULT(uobj) \ 100 (UVM_OBJ_IS_VNODE(uobj) && uvn_needs_writefault_p(uobj)) 101 102 #define UVM_OBJ_IS_AOBJ(uobj) \ 103 ((uobj)->pgops == &aobj_pager) 104 105 #define UVM_OBJ_INIT(uobj, ops, refs) \ 106 do { \ 107 simple_lock_init(&(uobj)->vmobjlock); \ 108 (uobj)->pgops = (ops); \ 109 TAILQ_INIT(&(uobj)->memq); \ 110 (uobj)->uo_npages = 0; \ 111 (uobj)->uo_refs = (refs); \ 112 } while (/* CONSTCOND */ 0) 113 114 #endif /* _KERNEL */ 115 116 #endif /* _UVM_UVM_OBJECT_H_ */ 117