The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_object.h

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    1 /*      $NetBSD: uvm_object.h,v 1.26 2008/06/04 15:06:04 ad Exp $       */
    2 
    3 /*
    4  *
    5  * Copyright (c) 1997 Charles D. Cranor and Washington University.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Charles D. Cranor and
   19  *      Washington University.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  *
   34  * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
   35  */
   36 
   37 #ifndef _UVM_UVM_OBJECT_H_
   38 #define _UVM_UVM_OBJECT_H_
   39 
   40 /*
   41  * uvm_object.h
   42  */
   43 
   44 #include <sys/rb.h>
   45 
   46 /*
   47  * uvm_object: all that is left of mach objects.
   48  */
   49 
   50 struct uvm_object {
   51         kmutex_t                vmobjlock;      /* lock on memq */
   52         const struct uvm_pagerops *pgops;       /* pager ops */
   53         struct pglist           memq;           /* pages in this object */
   54         int                     uo_npages;      /* # of pages in memq */
   55         unsigned                uo_refs;        /* reference count */
   56         struct rb_tree          rb_tree;        /* tree of pages */
   57 };
   58 
   59 /*
   60  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
   61  * object is a kernel memory object rather than a normal one (kernel
   62  * memory objects don't have reference counts -- they never die).
   63  *
   64  * this value is used to detected kernel object mappings at uvm_unmap()
   65  * time.   normally when an object is unmapped its pages eventaully become
   66  * deactivated and then paged out and/or freed.    this is not useful
   67  * for kernel objects... when a kernel object is unmapped we always want
   68  * to free the resources associated with the mapping.   UVM_OBJ_KERN
   69  * allows us to decide which type of unmapping we want to do.
   70  */
   71 #define UVM_OBJ_KERN            (-2)
   72 
   73 #define UVM_OBJ_IS_KERN_OBJECT(uobj)                                    \
   74         ((uobj)->uo_refs == UVM_OBJ_KERN)
   75 
   76 #ifdef _KERNEL
   77 
   78 extern const struct uvm_pagerops uvm_vnodeops;
   79 extern const struct uvm_pagerops uvm_deviceops;
   80 extern const struct uvm_pagerops ubc_pager;
   81 extern const struct uvm_pagerops aobj_pager;
   82 
   83 #define UVM_OBJ_IS_VNODE(uobj)                                          \
   84         ((uobj)->pgops == &uvm_vnodeops)
   85 
   86 #define UVM_OBJ_IS_DEVICE(uobj)                                         \
   87         ((uobj)->pgops == &uvm_deviceops)
   88 
   89 #define UVM_OBJ_IS_VTEXT(uobj)                                          \
   90         (UVM_OBJ_IS_VNODE(uobj) && uvn_text_p(uobj))
   91 
   92 #define UVM_OBJ_IS_CLEAN(uobj)                                          \
   93         (UVM_OBJ_IS_VNODE(uobj) && uvn_clean_p(uobj))
   94 
   95 /*
   96  * UVM_OBJ_NEEDS_WRITEFAULT: true if the uobj needs to detect modification.
   97  * (ie. wants to avoid writable user mappings.)
   98  *
   99  * XXX bad name
  100  */
  101 
  102 #define UVM_OBJ_NEEDS_WRITEFAULT(uobj)                                  \
  103         (UVM_OBJ_IS_VNODE(uobj) && uvn_needs_writefault_p(uobj))
  104 
  105 #define UVM_OBJ_IS_AOBJ(uobj)                                           \
  106         ((uobj)->pgops == &aobj_pager)
  107 
  108 extern const struct rb_tree_ops uvm_page_tree_ops;
  109 
  110 #define UVM_OBJ_INIT(uobj, ops, refs)                                   \
  111         do {                                                            \
  112                 mutex_init(&(uobj)->vmobjlock, MUTEX_DEFAULT, IPL_NONE);\
  113                 (uobj)->pgops = (ops);                                  \
  114                 TAILQ_INIT(&(uobj)->memq);                              \
  115                 (uobj)->uo_npages = 0;                                  \
  116                 (uobj)->uo_refs = (refs);                               \
  117                 rb_tree_init(&(uobj)->rb_tree, &uvm_page_tree_ops);     \
  118         } while (/* CONSTCOND */ 0)
  119 
  120 #ifdef DIAGNOSTIC
  121 #define UVM_OBJ_DESTROY(uobj)                                           \
  122         do {                                                            \
  123                 voff_t _xo = 0;                                         \
  124                 void *_xn;                                              \
  125                 mutex_destroy(&(uobj)->vmobjlock);                      \
  126                 _xn = rb_tree_find_node_geq(&(uobj)->rb_tree, &_xo);    \
  127                 KASSERT(_xn == NULL);                                   \
  128         } while (/* CONSTCOND */ 0)
  129 #else
  130 #define UVM_OBJ_DESTROY(uobj)                                           \
  131         do {                                                            \
  132                 mutex_destroy(&(uobj)->vmobjlock);                      \
  133         } while (/* CONSTCOND */ 0)
  134 #endif  /* DIAGNOSTIC */
  135 
  136 #endif /* _KERNEL */
  137 
  138 #endif /* _UVM_UVM_OBJECT_H_ */

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