/* $NetBSD: uvm_object.h,v 1.22 2006/10/12 10:14:20 yamt Exp $ */ /* * * Copyright (c) 1997 Charles D. Cranor and Washington University. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles D. Cranor and * Washington University. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp */ #ifndef _UVM_UVM_OBJECT_H_ #define _UVM_UVM_OBJECT_H_ /* * uvm_object.h */ /* * uvm_object: all that is left of mach objects. */ struct uvm_object { struct simplelock vmobjlock; /* lock on memq */ struct uvm_pagerops *pgops; /* pager ops */ struct pglist memq; /* pages in this object */ int uo_npages; /* # of pages in memq */ int uo_refs; /* reference count */ }; /* * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the * object is a kernel memory object rather than a normal one (kernel * memory objects don't have reference counts -- they never die). * * this value is used to detected kernel object mappings at uvm_unmap() * time. normally when an object is unmapped its pages eventaully become * deactivated and then paged out and/or freed. this is not useful * for kernel objects... when a kernel object is unmapped we always want * to free the resources associated with the mapping. UVM_OBJ_KERN * allows us to decide which type of unmapping we want to do. */ #define UVM_OBJ_KERN (-2) #define UVM_OBJ_IS_KERN_OBJECT(uobj) \ ((uobj)->uo_refs == UVM_OBJ_KERN) #ifdef _KERNEL extern struct uvm_pagerops uvm_vnodeops; extern struct uvm_pagerops uvm_deviceops; extern struct uvm_pagerops ubc_pager; extern struct uvm_pagerops aobj_pager; #define UVM_OBJ_IS_VNODE(uobj) \ ((uobj)->pgops == &uvm_vnodeops) #define UVM_OBJ_IS_DEVICE(uobj) \ ((uobj)->pgops == &uvm_deviceops) #define UVM_OBJ_IS_VTEXT(uobj) \ (UVM_OBJ_IS_VNODE(uobj) && uvn_text_p(uobj)) #define UVM_OBJ_IS_CLEAN(uobj) \ (UVM_OBJ_IS_VNODE(uobj) && uvn_clean_p(uobj)) /* * UVM_OBJ_NEEDS_WRITEFAULT: true if the uobj needs to detect modification. * (ie. wants to avoid writable user mappings.) * * XXX bad name */ #define UVM_OBJ_NEEDS_WRITEFAULT(uobj) \ (UVM_OBJ_IS_VNODE(uobj) && uvn_needs_writefault_p(uobj)) #define UVM_OBJ_IS_AOBJ(uobj) \ ((uobj)->pgops == &aobj_pager) #define UVM_OBJ_INIT(uobj, ops, refs) \ do { \ simple_lock_init(&(uobj)->vmobjlock); \ (uobj)->pgops = (ops); \ TAILQ_INIT(&(uobj)->memq); \ (uobj)->uo_npages = 0; \ (uobj)->uo_refs = (refs); \ } while (/* CONSTCOND */ 0) #endif /* _KERNEL */ #endif /* _UVM_UVM_OBJECT_H_ */