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UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

/*	$OpenBSD: uvm_object.h,v 1.8 2001/12/19 08:58:07 art Exp $	*/
/*	$NetBSD: uvm_object.h,v 1.11 2001/03/09 01:02:12 chs 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)

#ifdef _KERNEL

extern struct uvm_pagerops uvm_vnodeops;

#define	UVM_OBJ_IS_VNODE(uobj)						\
	((uobj)->pgops == &uvm_vnodeops)

#define	UVM_OBJ_IS_VTEXT(uobj)						\
	((uobj)->pgops == &uvm_vnodeops &&				\
	 ((struct vnode *)uobj)->v_flag & VTEXT)


#endif /* _KERNEL */

#endif /* _UVM_UVM_OBJECT_H_ */