1 /* $OpenBSD: uvm_object.h,v 1.18 2011/07/07 14:25:15 sobrado Exp $ */ 2 /* $NetBSD: uvm_object.h,v 1.11 2001/03/09 01:02:12 chs Exp $ */ 3 4 /* 5 * 6 * Copyright (c) 1997 Charles D. Cranor and Washington University. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Charles D. Cranor and 20 * Washington University. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp 36 */ 37 38 #ifndef _UVM_UVM_OBJECT_H_ 39 #define _UVM_UVM_OBJECT_H_ 40 41 /* 42 * uvm_object.h 43 */ 44 45 /* 46 * uvm_object: all that is left of mach objects. 47 */ 48 49 struct uvm_object { 50 simple_lock_data_t vmobjlock; /* lock on memt */ 51 struct uvm_pagerops *pgops; /* pager ops */ 52 RB_HEAD(uvm_objtree, vm_page) memt; /* pages in object */ 53 int uo_npages; /* # of pages in memt */ 54 int uo_refs; /* reference count */ 55 }; 56 57 /* 58 * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the 59 * object is a kernel memory object rather than a normal one (kernel 60 * memory objects don't have reference counts -- they never die). 61 * 62 * this value is used to detected kernel object mappings at uvm_unmap() 63 * time. normally when an object is unmapped its pages eventually become 64 * deactivated and then paged out and/or freed. this is not useful 65 * for kernel objects... when a kernel object is unmapped we always want 66 * to free the resources associated with the mapping. UVM_OBJ_KERN 67 * allows us to decide which type of unmapping we want to do. 68 * 69 * in addition, we have kernel objects which may be used in an 70 * interrupt context. these objects get their mappings entered 71 * with pmap_kenter*() and removed with pmap_kremove(), which 72 * are safe to call in interrupt context, and must be used ONLY 73 * for wired kernel mappings in these objects and their associated 74 * maps. 75 */ 76 #define UVM_OBJ_KERN (-2) 77 78 #define UVM_OBJ_IS_KERN_OBJECT(uobj) \ 79 ((uobj)->uo_refs == UVM_OBJ_KERN) 80 81 #ifdef _KERNEL 82 83 extern struct uvm_pagerops uvm_vnodeops; 84 extern struct uvm_pagerops uvm_deviceops; 85 86 /* For object trees */ 87 int uvm_pagecmp(struct vm_page *, struct vm_page *); 88 RB_PROTOTYPE(uvm_objtree, vm_page, objt, uvm_pagecmp) 89 90 #define UVM_OBJ_IS_VNODE(uobj) \ 91 ((uobj)->pgops == &uvm_vnodeops) 92 93 #define UVM_OBJ_IS_DEVICE(uobj) \ 94 ((uobj)->pgops == &uvm_deviceops) 95 96 #define UVM_OBJ_IS_VTEXT(uobj) \ 97 ((uobj)->pgops == &uvm_vnodeops && \ 98 ((struct vnode *)uobj)->v_flag & VTEXT) 99 100 void uvm_objinit(struct uvm_object *, struct uvm_pagerops *, int); 101 int uvm_objwire(struct uvm_object *, off_t, off_t, struct pglist *); 102 void uvm_objunwire(struct uvm_object *, off_t, off_t); 103 104 #endif /* _KERNEL */ 105 106 #endif /* _UVM_UVM_OBJECT_H_ */ 107