sys/uvm/uvm_object.h

1.1  mrg /*	$Id: uvm_object.h,v 1.1 1998/02/05 06:25:09 mrg Exp $	*/
1.1  mrg
1.1  mrg /*
1.1  mrg  * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
1.1  mrg  *	   >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
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.
1.1  mrg  */
1.1  mrg
1.1  mrg /*
1.1  mrg  * uvm_object.h
1.1  mrg  */
1.1  mrg
1.1  mrg #ifndef UVM_UVM_OBJECT_H
1.1  mrg #define UVM_UVM_OBJECT_H
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 {
1.1  mrg   simple_lock_data_t	vmobjlock;	/* lock on memq */
1.1  mrg   struct uvm_pagerops	*pgops;		/* pager ops */
1.1  mrg   struct pglist		memq;		/* pages in this object */
1.1  mrg   int			uo_npages;	/* # of pages in memq */
1.1  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)
1.1  mrg
1.1  mrg #endif /* !UVM_UVM_OBJECT_H */