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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_CACHEABLE   8
  37.  
  38. #ifdef KERNEL
  39.  
  40. #include <arch/mm/page.h>
  41. #include <arch/mm/as.h>
  42. #include <arch/mm/asid.h>
  43. #include <arch/types.h>
  44. #include <typedefs.h>
  45. #include <synch/spinlock.h>
  46. #include <synch/mutex.h>
  47. #include <adt/list.h>
  48. #include <adt/btree.h>
  49. #include <elf.h>
  50.  
  51. /** Defined to be true if user address space and kernel address space shadow each other. */
  52. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  53.  
  54. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  55. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  56. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  57. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  58.  
  59. #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
  60.  
  61. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  62.  
  63. #define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
  64.  
  65. /** Address space structure.
  66.  *
  67.  * as_t contains the list of as_areas of userspace accessible
  68.  * pages for one or more tasks. Ranges of kernel memory pages are not
  69.  * supposed to figure in the list as they are shared by all tasks and
  70.  * set up during system initialization.
  71.  */
  72. struct as {
  73.     /** Protected by asidlock. */
  74.     link_t inactive_as_with_asid_link;
  75.  
  76.     mutex_t lock;
  77.  
  78.     /** Number of references (i.e tasks that reference this as). */
  79.     count_t refcount;
  80.  
  81.     /** Number of processors on wich is this address space active. */
  82.     count_t cpu_refcount;
  83.  
  84.     /** B+tree of address space areas. */
  85.     btree_t as_area_btree;
  86.  
  87.     /** Page table pointer. Constant on architectures that use global page hash table. */
  88.     pte_t *page_table;
  89.  
  90.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  91.     asid_t asid;
  92. };
  93.  
  94. struct as_operations {
  95.     pte_t *(* page_table_create)(int flags);
  96.     void (* page_table_destroy)(pte_t *page_table);
  97.     void (* page_table_lock)(as_t *as, bool lock);
  98.     void (* page_table_unlock)(as_t *as, bool unlock);
  99. };
  100. typedef struct as_operations as_operations_t;
  101.  
  102. /** Address space area attributes. */
  103. #define AS_AREA_ATTR_NONE   0
  104. #define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
  105.  
  106. #define AS_PF_FAULT     0   /**< The page fault was not resolved by as_page_fault(). */
  107. #define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
  108. #define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace()
  109.                          or memcpy_to_uspace(). */
  110.  
  111. /** This structure contains information associated with the shared address space area. */
  112. typedef struct {
  113.     mutex_t lock;       /**< This lock must be acquired only when the as_area lock is held. */
  114.     count_t refcount;   /**< This structure can be deallocated if refcount drops to 0. */
  115.     btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
  116. } share_info_t;
  117.  
  118. /** Address space area backend structure. */
  119. typedef struct {
  120.     int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);
  121.     void (* frame_free)(as_area_t *area, __address page, __address frame);
  122.     void (* share)(as_area_t *area);
  123. } mem_backend_t;
  124.  
  125. /** Backend data stored in address space area. */
  126. typedef union {
  127.     struct {    /**< elf_backend members */
  128.         elf_header_t *elf;
  129.         elf_segment_header_t *segment;
  130.     };
  131.     struct {    /**< phys_backend members */
  132.         __address base;
  133.         count_t frames;
  134.     };
  135. } mem_backend_data_t;
  136.  
  137. /** Address space area structure.
  138.  *
  139.  * Each as_area_t structure describes one contiguous area of virtual memory.
  140.  * In the future, it should not be difficult to support shared areas.
  141.  */
  142. struct as_area {
  143.     mutex_t lock;
  144.     as_t *as;       /**< Containing address space. */
  145.     int flags;      /**< Flags related to the memory represented by the address space area. */
  146.     int attributes;     /**< Attributes related to the address space area itself. */
  147.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  148.     __address base;     /**< Base address of this area. */
  149.     btree_t used_space; /**< Map of used space. */
  150.     share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
  151.                          reference the share info structure. */
  152.     mem_backend_t *backend; /**< Memory backend backing this address space area. */
  153.  
  154.     /** Data to be used by the backend. */
  155.     mem_backend_data_t backend_data;
  156. };
  157.  
  158. extern as_t *AS_KERNEL;
  159. extern as_operations_t *as_operations;
  160.  
  161. extern spinlock_t inactive_as_with_asid_lock;
  162. extern link_t inactive_as_with_asid_head;
  163.  
  164. extern void as_init(void);
  165.  
  166. extern as_t *as_create(int flags);
  167. extern void as_destroy(as_t *as);
  168. extern void as_switch(as_t *old, as_t *new);
  169. extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);
  170.  
  171. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs,
  172.     mem_backend_t *backend, mem_backend_data_t *backend_data);
  173. extern int as_area_destroy(as_t *as, __address address);   
  174. extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
  175. int as_area_share(as_t *src_as, __address src_base, size_t acc_size,
  176.           as_t *dst_as, __address dst_base, int dst_flags_mask);
  177.  
  178. extern int as_area_get_flags(as_area_t *area);
  179. extern bool as_area_check_access(as_area_t *area, pf_access_t access);
  180. extern size_t as_get_size(__address base);
  181. extern int used_space_insert(as_area_t *a, __address page, count_t count);
  182. extern int used_space_remove(as_area_t *a, __address page, count_t count);
  183.  
  184. /* Interface to be implemented by architectures. */
  185. #ifndef as_install_arch
  186. extern void as_install_arch(as_t *as);
  187. #endif /* !def as_install_arch */
  188.  
  189. /* Backend declarations. */
  190. extern mem_backend_t anon_backend;
  191. extern mem_backend_t elf_backend;
  192. extern mem_backend_t phys_backend;
  193.  
  194. /* Address space area related syscalls. */
  195. extern __native sys_as_area_create(__address address, size_t size, int flags);
  196. extern __native sys_as_area_resize(__address address, size_t size, int flags);
  197. extern __native sys_as_area_destroy(__address address);
  198.  
  199. #endif /* KERNEL */
  200.  
  201. #endif
  202.