/* $NetBSD: uvm_object.h,v 1.8 1999/05/25 20:30:09 thorpej 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 { simple_lock_data_t 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. * * in addition, we have kernel objects which may be used in an * interrupt context. these objects get their mappings entered * with pmap_kenter*() and removed with pmap_kremove(), which * are safe to call in interrupt context, and must be used ONLY * for wired kernel mappings in these objects and their associated * maps. */ #define UVM_OBJ_KERN (-2) #define UVM_OBJ_KERN_INTRSAFE (-3) #define UVM_OBJ_IS_KERN_OBJECT(uobj) \ ((uobj)->uo_refs == UVM_OBJ_KERN || \ (uobj)->uo_refs == UVM_OBJ_KERN_INTRSAFE) #define UVM_OBJ_IS_INTRSAFE_OBJECT(uobj) \ ((uobj)->uo_refs == UVM_OBJ_KERN_INTRSAFE) #endif /* _UVM_UVM_OBJECT_H_ */