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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_HT_H_
  36. #define KERN_AS_HT_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. /** Address space structure.
  45.  *
  46.  * as_t contains the list of as_areas of userspace accessible
  47.  * pages for one or more tasks. Ranges of kernel memory pages are not
  48.  * supposed to figure in the list as they are shared by all tasks and
  49.  * set up during system initialization.
  50.  */
  51. typedef struct {
  52.     /** Protected by asidlock. */
  53.     link_t inactive_as_with_asid_link;
  54.  
  55.     mutex_t lock;
  56.  
  57.     /** Number of references (i.e tasks that reference this as). */
  58.     count_t refcount;
  59.  
  60.     /** Number of processors on wich is this address space active. */
  61.     count_t cpu_refcount;
  62.  
  63.     /** B+tree of address space areas. */
  64.     btree_t as_area_btree;
  65.  
  66.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  67.     asid_t asid;
  68.    
  69.     /** Architecture specific content. */
  70.     as_arch_t arch;
  71. } as_t;
  72.  
  73. typedef struct {
  74.     link_t link;        /**< Page hash table link. */
  75.     as_t *as;       /**< Address space. */
  76.     uintptr_t page;     /**< Virtual memory page. */
  77.     uintptr_t frame;    /**< Physical memory frame. */
  78.     unsigned g : 1;     /**< Global page. */
  79.     unsigned x : 1;     /**< Execute. */
  80.     unsigned w : 1;     /**< Writable. */
  81.     unsigned k : 1;     /**< Kernel privileges required. */
  82.     unsigned c : 1;     /**< Cacheable. */
  83.     unsigned a : 1;     /**< Accessed. */
  84.     unsigned d : 1;     /**< Dirty. */
  85.     unsigned p : 1;     /**< Present. */
  86. } pte_t;
  87.  
  88. #endif
  89.  
  90. /** @}
  91.  */
  92.