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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. /** Address space area flags. */
  33. #define AS_AREA_READ    1
  34. #define AS_AREA_WRITE   2
  35. #define AS_AREA_EXEC    4
  36. #define AS_AREA_DEVICE  8
  37.  
  38.  
  39. #ifdef KERNEL
  40.  
  41. #include <arch/mm/page.h>
  42. #include <arch/mm/as.h>
  43. #include <arch/mm/asid.h>
  44. #include <arch/types.h>
  45. #include <typedefs.h>
  46. #include <synch/spinlock.h>
  47. #include <adt/list.h>
  48. #include <adt/btree.h>
  49.  
  50. /** Defined to be true if user address space and kernel address space shadow each other. */
  51. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  52.  
  53. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  54. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  55. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  56. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  57.  
  58. #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
  59.  
  60. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  61.  
  62. #define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
  63.  
  64.  
  65. /** Address space area attributes. */
  66. #define AS_AREA_ATTR_NONE   0
  67. #define AS_AREA_ATTR_PARTIAL    1   /* Not fully initialized area. */
  68.  
  69. #define AS_PF_FAULT     0   /**< The page fault was not resolved by asp_page_fault(). */
  70. #define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
  71. #define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace(). */
  72.  
  73. /** Address space area structure.
  74.  *
  75.  * Each as_area_t structure describes one contiguous area of virtual memory.
  76.  * In the future, it should not be difficult to support shared areas.
  77.  */
  78. struct as_area {
  79.     SPINLOCK_DECLARE(lock);
  80.     int flags;      /**< Flags related to the memory represented by the address space area. */
  81.     int attributes;     /**< Attributes related to the address space area itself. */
  82.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  83.     __address base;     /**< Base address of this area. */
  84. };
  85.  
  86. /** Address space structure.
  87.  *
  88.  * as_t contains the list of as_areas of userspace accessible
  89.  * pages for one or more tasks. Ranges of kernel memory pages are not
  90.  * supposed to figure in the list as they are shared by all tasks and
  91.  * set up during system initialization.
  92.  */
  93. struct as {
  94.     /** Protected by asidlock. Must be acquired before as->lock. */
  95.     link_t inactive_as_with_asid_link;
  96.  
  97.     SPINLOCK_DECLARE(lock);
  98.  
  99.     /** Number of processors on wich is this address space active. */
  100.     count_t refcount;
  101.  
  102.     /** B+tree of address space areas. */
  103.     btree_t as_area_btree;
  104.  
  105.     /** Page table pointer. Constant on architectures that use global page hash table. */
  106.     pte_t *page_table;
  107.  
  108.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  109.     asid_t asid;
  110. };
  111.  
  112. struct as_operations {
  113.     pte_t *(* page_table_create)(int flags);
  114.     void (* page_table_lock)(as_t *as, bool lock);
  115.     void (* page_table_unlock)(as_t *as, bool unlock);
  116. };
  117. typedef struct as_operations as_operations_t;
  118.  
  119. extern as_t *AS_KERNEL;
  120. extern as_operations_t *as_operations;
  121.  
  122. extern spinlock_t as_lock;
  123. extern link_t inactive_as_with_asid_head;
  124.  
  125. extern void as_init(void);
  126. extern as_t *as_create(int flags);
  127. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs);
  128. extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
  129. extern int as_area_destroy(as_t *as, __address address);
  130. extern void as_set_mapping(as_t *as, __address page, __address frame);
  131. extern int as_page_fault(__address page, istate_t *istate);
  132. extern void as_switch(as_t *old, as_t *new);
  133. extern void as_free(as_t *as);
  134. extern int as_area_steal(task_t *src_task, __address src_base, size_t acc_size, __address dst_base);
  135. extern size_t as_get_size(__address base);
  136.  
  137. /* Interface to be implemented by architectures. */
  138. #ifndef as_install_arch
  139. extern void as_install_arch(as_t *as);
  140. #endif /* !def as_install_arch */
  141.  
  142. /* Address space area related syscalls. */
  143. extern __native sys_as_area_create(__address address, size_t size, int flags);
  144. extern __native sys_as_area_resize(__address address, size_t size, int flags);
  145. extern __native sys_as_area_destroy(__address address);
  146.  
  147. #endif /* KERNEL */
  148.  
  149. #endif
  150.