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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 <mm/as_arg.h>
  33. #include <arch/mm/page.h>
  34. #include <arch/mm/as.h>
  35. #include <arch/mm/asid.h>
  36. #include <arch/types.h>
  37. #include <typedefs.h>
  38. #include <synch/spinlock.h>
  39. #include <adt/list.h>
  40. #include <adt/btree.h>
  41.  
  42. /** Defined to be true if user address space and kernel address space shadow each other. */
  43. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  44.  
  45. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  46. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  47. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  48. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  49.  
  50. #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
  51.  
  52. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  53.  
  54. #define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
  55.  
  56. /** Address space area flags. */
  57. #define AS_AREA_READ    1
  58. #define AS_AREA_WRITE   2
  59. #define AS_AREA_EXEC    4
  60. #define AS_AREA_DEVICE  8
  61.  
  62. /** Address space area structure.
  63.  *
  64.  * Each as_area_t structure describes one contiguous area of virtual memory.
  65.  * In the future, it should not be difficult to support shared areas.
  66.  */
  67. struct as_area {
  68.     SPINLOCK_DECLARE(lock);
  69.     int flags;
  70.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  71.     __address base;     /**< Base address of this area. */
  72. };
  73.  
  74. /** Address space structure.
  75.  *
  76.  * as_t contains the list of as_areas of userspace accessible
  77.  * pages for one or more tasks. Ranges of kernel memory pages are not
  78.  * supposed to figure in the list as they are shared by all tasks and
  79.  * set up during system initialization.
  80.  */
  81. struct as {
  82.     /** Protected by asidlock. Must be acquired before as->lock. */
  83.     link_t inactive_as_with_asid_link;
  84.  
  85.     SPINLOCK_DECLARE(lock);
  86.  
  87.     /** Number of processors on wich is this address space active. */
  88.     count_t refcount;
  89.  
  90.     /** B+tree of address space areas. */
  91.     btree_t as_area_btree;
  92.  
  93.     /** Page table pointer. Constant on architectures that use global page hash table. */
  94.     pte_t *page_table;
  95.  
  96.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  97.     asid_t asid;
  98. };
  99.  
  100. struct as_operations {
  101.     pte_t *(* page_table_create)(int flags);
  102.     void (* page_table_lock)(as_t *as, bool lock);
  103.     void (* page_table_unlock)(as_t *as, bool unlock);
  104. };
  105. typedef struct as_operations as_operations_t;
  106.  
  107. extern as_t *AS_KERNEL;
  108. extern as_operations_t *as_operations;
  109.  
  110. extern spinlock_t as_lock;
  111. extern link_t inactive_as_with_asid_head;
  112.  
  113. extern void as_init(void);
  114. extern as_t *as_create(int flags);
  115. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base);
  116. extern __address as_area_resize(as_t *as, __address address, size_t size, int flags);
  117. int as_area_send(task_id_t id, __address base, size_t size, int flags);
  118. extern void as_set_mapping(as_t *as, __address page, __address frame);
  119. extern int as_page_fault(__address page);
  120. extern void as_switch(as_t *old, as_t *new);
  121. extern void as_free(as_t *as);
  122.  
  123. /* Interface to be implemented by architectures. */
  124. #ifndef as_install_arch
  125. extern void as_install_arch(as_t *as);
  126. #endif /* !def as_install_arch */
  127.  
  128. /* Address space area related syscalls. */
  129. extern __native sys_as_area_create(__address address, size_t size, int flags);
  130. extern __native sys_as_area_resize(__address address, size_t size, int flags);
  131. extern __native sys_as_area_accept(as_area_acptsnd_arg_t *uspace_accept_arg);
  132. extern __native sys_as_area_send(as_area_acptsnd_arg_t *uspace_send_arg);
  133.  
  134. #endif
  135.