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  1. /*
  2.  * Copyright (C) 2001-2004 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. #ifndef __AS_H__
  30. #define __AS_H__
  31.  
  32. #include <arch/mm/page.h>
  33. #include <arch/mm/as.h>
  34. #include <arch/mm/asid.h>
  35. #include <arch/types.h>
  36. #include <typedefs.h>
  37. #include <synch/spinlock.h>
  38. #include <adt/list.h>
  39. #include <adt/btree.h>
  40.  
  41. /** Defined to be true if user address space and kernel address space shadow each other. */
  42. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  43.  
  44. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  45. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  46. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  47. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  48.  
  49. #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
  50.  
  51. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  52.  
  53. #define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
  54.  
  55. /** Address space area flags. */
  56. #define AS_AREA_READ    1
  57. #define AS_AREA_WRITE   2
  58. #define AS_AREA_EXEC    4
  59.  
  60. /** Address space area structure.
  61.  *
  62.  * Each as_area_t structure describes one contiguous area of virtual memory.
  63.  * In the future, it should not be difficult to support shared areas.
  64.  */
  65. struct as_area {
  66.     SPINLOCK_DECLARE(lock);
  67.     int flags;
  68.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  69.     __address base;     /**< Base address of this area. */
  70. };
  71.  
  72. /** Address space structure.
  73.  *
  74.  * as_t contains the list of as_areas of userspace accessible
  75.  * pages for one or more tasks. Ranges of kernel memory pages are not
  76.  * supposed to figure in the list as they are shared by all tasks and
  77.  * set up during system initialization.
  78.  */
  79. struct as {
  80.     /** Protected by asidlock. Must be acquired before as->lock. */
  81.     link_t inactive_as_with_asid_link;
  82.  
  83.     SPINLOCK_DECLARE(lock);
  84.  
  85.     /** Number of processors on wich is this address space active. */
  86.     count_t refcount;
  87.  
  88.     /** B+-tree of address space areas. */
  89.     btree_t as_area_btree;
  90.  
  91.     /** Page table pointer. Constant on architectures that use global page hash table. */
  92.     pte_t *page_table;
  93.  
  94.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  95.     asid_t asid;
  96. };
  97.  
  98. struct as_operations {
  99.     pte_t *(* page_table_create)(int flags);
  100.     void (* page_table_lock)(as_t *as, bool lock);
  101.     void (* page_table_unlock)(as_t *as, bool unlock);
  102. };
  103. typedef struct as_operations as_operations_t;
  104.  
  105. extern as_t *AS_KERNEL;
  106. extern as_operations_t *as_operations;
  107.  
  108. extern spinlock_t as_lock;
  109. extern link_t inactive_as_with_asid_head;
  110.  
  111. extern void as_init(void);
  112. extern as_t *as_create(int flags);
  113. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base);
  114. extern __address as_remap(as_t *as, __address address, size_t size, int flags);
  115. extern void as_set_mapping(as_t *as, __address page, __address frame);
  116. extern int as_page_fault(__address page);
  117. extern void as_switch(as_t *old, as_t *new);
  118. extern void as_free(as_t *as);
  119.  
  120. /* Interface to be implemented by architectures. */
  121. #ifndef as_install_arch
  122. extern void as_install_arch(as_t *as);
  123. #endif /* !def as_install_arch */
  124.  
  125. #endif
  126.