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uvm_object.h revision 1.2 
      1 /*	$NetBSD: uvm_object.h,v 1.2 1998/02/06 22:32:11 thorpej Exp $	*/
      2 
      3 /*
      4  * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
      5  *	   >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
      6  */
      7 /*
      8  *
      9  * Copyright (c) 1997 Charles D. Cranor and Washington University.
     10  * All rights reserved.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *      This product includes software developed by Charles D. Cranor and
     23  *      Washington University.
     24  * 4. The name of the author may not be used to endorse or promote products
     25  *    derived from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * uvm_object.h
     41  */
     42 
     43 #ifndef UVM_UVM_OBJECT_H
     44 #define UVM_UVM_OBJECT_H
     45 
     46 /*
     47  * uvm_object: all that is left of mach objects.
     48  */
     49 
     50 struct uvm_object {
     51   simple_lock_data_t	vmobjlock;	/* lock on memq */
     52   struct uvm_pagerops	*pgops;		/* pager ops */
     53   struct pglist		memq;		/* pages in this object */
     54   int			uo_npages;	/* # of pages in memq */
     55   int                   uo_refs;	/* reference count */
     56 };
     57 
     58 /*
     59  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
     60  * object is a kernel memory object rather than a normal one (kernel
     61  * memory objects don't have reference counts -- they never die).
     62  *
     63  * this value is used to detected kernel object mappings at uvm_unmap()
     64  * time.   normally when an object is unmapped its pages eventaully become
     65  * deactivated and then paged out and/or freed.    this is not useful
     66  * for kernel objects... when a kernel object is unmapped we always want
     67  * to free the resources associated with the mapping.   UVM_OBJ_KERN
     68  * allows us to decide which type of unmapping we want to do.
     69  */
     70 #define UVM_OBJ_KERN	(-2)
     71 
     72 #endif /* !UVM_UVM_OBJECT_H */
     73