sys/uvm/uvm_object.h

1.7  thorpej /*	$NetBSD: uvm_object.h,v 1.7 1999/05/25 00:09:01 thorpej Exp $	*/
1.1      mrg
1.1      mrg /*
1.1      mrg  *
1.1      mrg  * Copyright (c) 1997 Charles D. Cranor and Washington University.
1.1      mrg  * All rights reserved.
1.1      mrg  *
1.1      mrg  * Redistribution and use in source and binary forms, with or without
1.1      mrg  * modification, are permitted provided that the following conditions
1.1      mrg  * are met:
1.1      mrg  * 1. Redistributions of source code must retain the above copyright
1.1      mrg  *    notice, this list of conditions and the following disclaimer.
1.1      mrg  * 2. Redistributions in binary form must reproduce the above copyright
1.1      mrg  *    notice, this list of conditions and the following disclaimer in the
1.1      mrg  *    documentation and/or other materials provided with the distribution.
1.1      mrg  * 3. All advertising materials mentioning features or use of this software
1.1      mrg  *    must display the following acknowledgement:
1.1      mrg  *      This product includes software developed by Charles D. Cranor and
1.1      mrg  *      Washington University.
1.1      mrg  * 4. The name of the author may not be used to endorse or promote products
1.1      mrg  *    derived from this software without specific prior written permission.
1.1      mrg  *
1.1      mrg  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1.1      mrg  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1.1      mrg  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1.1      mrg  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1.1      mrg  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1.1      mrg  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.1      mrg  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.1      mrg  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.1      mrg  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.1      mrg  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.3      mrg  *
1.3      mrg  * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
1.1      mrg  */
1.1      mrg
1.4    perry #ifndef _UVM_UVM_OBJECT_H_
1.4    perry #define _UVM_UVM_OBJECT_H_
1.4    perry
1.1      mrg /*
1.1      mrg  * uvm_object.h
1.1      mrg  */
1.1      mrg
1.1      mrg /*
1.1      mrg  * uvm_object: all that is left of mach objects.
1.1      mrg  */
1.1      mrg
1.1      mrg struct uvm_object {
1.5      mrg 	simple_lock_data_t	vmobjlock;	/* lock on memq */
1.5      mrg 	struct uvm_pagerops	*pgops;		/* pager ops */
1.5      mrg 	struct pglist		memq;		/* pages in this object */
1.5      mrg 	int			uo_npages;	/* # of pages in memq */
1.5      mrg 	int			uo_refs;	/* reference count */
1.1      mrg };
1.1      mrg
1.1      mrg /*
1.1      mrg  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
1.1      mrg  * object is a kernel memory object rather than a normal one (kernel
1.1      mrg  * memory objects don't have reference counts -- they never die).
1.1      mrg  *
1.1      mrg  * this value is used to detected kernel object mappings at uvm_unmap()
1.1      mrg  * time.   normally when an object is unmapped its pages eventaully become
1.1      mrg  * deactivated and then paged out and/or freed.    this is not useful
1.1      mrg  * for kernel objects... when a kernel object is unmapped we always want
1.1      mrg  * to free the resources associated with the mapping.   UVM_OBJ_KERN
1.1      mrg  * allows us to decide which type of unmapping we want to do.
1.1      mrg  */
1.1      mrg #define UVM_OBJ_KERN	(-2)
1.7  thorpej
1.7  thorpej #define	UVM_OBJ_IS_KERN_OBJECT(uobj)	((uobj)->uo_refs == UVM_OBJ_KERN)
1.1      mrg
1.4    perry #endif /* _UVM_UVM_OBJECT_H_ */