1 /* $NetBSD: uvm_object.h,v 1.31 2011/06/12 03:36:03 rmind Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp 28 */ 29 30 #ifndef _UVM_UVM_OBJECT_H_ 31 #define _UVM_UVM_OBJECT_H_ 32 33 /* 34 * uvm_object.h 35 */ 36 37 #include <sys/queue.h> 38 #include <sys/rbtree.h> 39 #include <uvm/uvm_pglist.h> 40 41 /* 42 * uvm_object: all that is left of mach objects. 43 */ 44 45 struct uvm_object { 46 kmutex_t * vmobjlock; /* lock on memq */ 47 const struct uvm_pagerops *pgops; /* pager ops */ 48 struct pglist memq; /* pages in this object */ 49 int uo_npages; /* # of pages in memq */ 50 unsigned uo_refs; /* reference count */ 51 struct rb_tree rb_tree; /* tree of pages */ 52 LIST_HEAD(,ubc_map) uo_ubc; /* ubc mappings */ 53 }; 54 55 /* 56 * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the 57 * object is a kernel memory object rather than a normal one (kernel 58 * memory objects don't have reference counts -- they never die). 59 * 60 * this value is used to detected kernel object mappings at uvm_unmap() 61 * time. normally when an object is unmapped its pages eventaully become 62 * deactivated and then paged out and/or freed. this is not useful 63 * for kernel objects... when a kernel object is unmapped we always want 64 * to free the resources associated with the mapping. UVM_OBJ_KERN 65 * allows us to decide which type of unmapping we want to do. 66 */ 67 #define UVM_OBJ_KERN (-2) 68 69 #define UVM_OBJ_IS_KERN_OBJECT(uobj) \ 70 ((uobj)->uo_refs == UVM_OBJ_KERN) 71 72 #ifdef _KERNEL 73 74 extern const struct uvm_pagerops uvm_vnodeops; 75 extern const struct uvm_pagerops uvm_deviceops; 76 extern const struct uvm_pagerops ubc_pager; 77 extern const struct uvm_pagerops aobj_pager; 78 79 #define UVM_OBJ_IS_VNODE(uobj) \ 80 ((uobj)->pgops == &uvm_vnodeops) 81 82 #define UVM_OBJ_IS_DEVICE(uobj) \ 83 ((uobj)->pgops == &uvm_deviceops) 84 85 #define UVM_OBJ_IS_VTEXT(uobj) \ 86 (UVM_OBJ_IS_VNODE(uobj) && uvn_text_p(uobj)) 87 88 #define UVM_OBJ_IS_CLEAN(uobj) \ 89 (UVM_OBJ_IS_VNODE(uobj) && uvn_clean_p(uobj)) 90 91 /* 92 * UVM_OBJ_NEEDS_WRITEFAULT: true if the uobj needs to detect modification. 93 * (ie. wants to avoid writable user mappings.) 94 * 95 * XXX bad name 96 */ 97 98 #define UVM_OBJ_NEEDS_WRITEFAULT(uobj) \ 99 (UVM_OBJ_IS_VNODE(uobj) && uvn_needs_writefault_p(uobj)) 100 101 #define UVM_OBJ_IS_AOBJ(uobj) \ 102 ((uobj)->pgops == &aobj_pager) 103 104 extern const rb_tree_ops_t uvm_page_tree_ops; 105 106 #endif /* _KERNEL */ 107 108 #endif /* _UVM_UVM_OBJECT_H_ */ 109