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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genarchmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_AS_PT_H_
  36. #define KERN_AS_PT_H_
  37.  
  38. #include <mm/mm.h>
  39. #include <arch/mm/asid.h>
  40. #include <adt/list.h>
  41. #include <adt/btree.h>
  42. #include <synch/mutex.h>
  43.  
  44. #define AS_PAGE_TABLE
  45.  
  46. /** Address space structure.
  47.  *
  48.  * as_t contains the list of as_areas of userspace accessible
  49.  * pages for one or more tasks. Ranges of kernel memory pages are not
  50.  * supposed to figure in the list as they are shared by all tasks and
  51.  * set up during system initialization.
  52.  */
  53. typedef struct {
  54.     /** Protected by asidlock. */
  55.     link_t inactive_as_with_asid_link;
  56.  
  57.     mutex_t lock;
  58.  
  59.     /** Number of references (i.e tasks that reference this as). */
  60.     count_t refcount;
  61.  
  62.     /** Number of processors on wich is this address space active. */
  63.     count_t cpu_refcount;
  64.  
  65.     /** B+tree of address space areas. */
  66.     btree_t as_area_btree;
  67.    
  68.     /** Page table pointer. */
  69.     pte_t *page_table;
  70.  
  71.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  72.     asid_t asid;
  73.    
  74.     /** Architecture specific content. */
  75.     as_arch_t arch;
  76. } as_t;
  77.  
  78. #endif
  79.  
  80. /** @}
  81.  */
  82.