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Annotation of src/sys/uvm/uvm_object.h, Revision 1.5

1.5     ! mrg         1: /*     $NetBSD: uvm_object.h,v 1.4 1998/02/10 02:34:50 perry Exp $     */
1.1       mrg         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.
1.3       mrg        37:  *
                     38:  * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
1.1       mrg        39:  */
                     40:
1.4       perry      41: #ifndef _UVM_UVM_OBJECT_H_
                     42: #define _UVM_UVM_OBJECT_H_
                     43:
1.1       mrg        44: /*
                     45:  * uvm_object.h
                     46:  */
                     47:
                     48: /*
                     49:  * uvm_object: all that is left of mach objects.
                     50:  */
                     51:
                     52: struct uvm_object {
1.5     ! mrg        53:        simple_lock_data_t      vmobjlock;      /* lock on memq */
        !            54:        struct uvm_pagerops     *pgops;         /* pager ops */
        !            55:        struct pglist           memq;           /* pages in this object */
        !            56:        int                     uo_npages;      /* # of pages in memq */
        !            57:        int                     uo_refs;        /* reference count */
1.1       mrg        58: };
                     59:
                     60: /*
                     61:  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
                     62:  * object is a kernel memory object rather than a normal one (kernel
                     63:  * memory objects don't have reference counts -- they never die).
                     64:  *
                     65:  * this value is used to detected kernel object mappings at uvm_unmap()
                     66:  * time.   normally when an object is unmapped its pages eventaully become
                     67:  * deactivated and then paged out and/or freed.    this is not useful
                     68:  * for kernel objects... when a kernel object is unmapped we always want
                     69:  * to free the resources associated with the mapping.   UVM_OBJ_KERN
                     70:  * allows us to decide which type of unmapping we want to do.
                     71:  */
                     72: #define UVM_OBJ_KERN   (-2)
                     73:
1.4       perry      74: #endif /* _UVM_UVM_OBJECT_H_ */