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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. /** @addtogroup genericmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_AS_H_
  36. #define KERN_AS_H_
  37.  
  38. /** Address space area flags. */
  39. #define AS_AREA_READ        1
  40. #define AS_AREA_WRITE       2
  41. #define AS_AREA_EXEC        4
  42. #define AS_AREA_CACHEABLE   8
  43.  
  44. #ifdef KERNEL
  45.  
  46. #include <arch/mm/page.h>
  47. #include <arch/mm/as.h>
  48. #include <arch/mm/asid.h>
  49. #include <arch/types.h>
  50. #include <typedefs.h>
  51. #include <synch/spinlock.h>
  52. #include <synch/mutex.h>
  53. #include <adt/list.h>
  54. #include <adt/btree.h>
  55. #include <elf.h>
  56.  
  57. /** Defined to be true if user address space and kernel address space shadow each other. */
  58. #define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
  59.  
  60. #define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
  61. #define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
  62. #define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
  63. #define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
  64.  
  65. #define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
  66.  
  67. #define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
  68.  
  69. /** Address space structure.
  70.  *
  71.  * as_t contains the list of as_areas of userspace accessible
  72.  * pages for one or more tasks. Ranges of kernel memory pages are not
  73.  * supposed to figure in the list as they are shared by all tasks and
  74.  * set up during system initialization.
  75.  */
  76. struct as {
  77.     /** Protected by asidlock. */
  78.     link_t inactive_as_with_asid_link;
  79.  
  80.     mutex_t lock;
  81.  
  82.     /** Number of references (i.e tasks that reference this as). */
  83.     count_t refcount;
  84.  
  85.     /** Number of processors on wich is this address space active. */
  86.     count_t cpu_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.     /** Architecture specific content. */
  98.     as_arch_t arch;
  99. };
  100.  
  101. struct as_operations {
  102.     pte_t *(* page_table_create)(int flags);
  103.     void (* page_table_destroy)(pte_t *page_table);
  104.     void (* page_table_lock)(as_t *as, bool lock);
  105.     void (* page_table_unlock)(as_t *as, bool unlock);
  106. };
  107. typedef struct as_operations as_operations_t;
  108.  
  109. /** Address space area attributes. */
  110. #define AS_AREA_ATTR_NONE   0
  111. #define AS_AREA_ATTR_PARTIAL    1   /**< Not fully initialized area. */
  112.  
  113. #define AS_PF_FAULT     0   /**< The page fault was not resolved by as_page_fault(). */
  114. #define AS_PF_OK        1   /**< The page fault was resolved by as_page_fault(). */
  115. #define AS_PF_DEFER     2   /**< The page fault was caused by memcpy_from_uspace()
  116.                          or memcpy_to_uspace(). */
  117.  
  118. /** This structure contains information associated with the shared address space area. */
  119. typedef struct {
  120.     mutex_t lock;       /**< This lock must be acquired only when the as_area lock is held. */
  121.     count_t refcount;   /**< This structure can be deallocated if refcount drops to 0. */
  122.     btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
  123. } share_info_t;
  124.  
  125. /** Address space area backend structure. */
  126. typedef struct {
  127.     int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
  128.     void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
  129.     void (* share)(as_area_t *area);
  130. } mem_backend_t;
  131.  
  132. /** Backend data stored in address space area. */
  133. typedef union {
  134.     struct {    /**< elf_backend members */
  135.         elf_header_t *elf;
  136.         elf_segment_header_t *segment;
  137.     };
  138.     struct {    /**< phys_backend members */
  139.         uintptr_t base;
  140.         count_t frames;
  141.     };
  142. } mem_backend_data_t;
  143.  
  144. /** Address space area structure.
  145.  *
  146.  * Each as_area_t structure describes one contiguous area of virtual memory.
  147.  * In the future, it should not be difficult to support shared areas.
  148.  */
  149. struct as_area {
  150.     mutex_t lock;
  151.     as_t *as;       /**< Containing address space. */
  152.     int flags;      /**< Flags related to the memory represented by the address space area. */
  153.     int attributes;     /**< Attributes related to the address space area itself. */
  154.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  155.     uintptr_t base;     /**< Base address of this area. */
  156.     btree_t used_space; /**< Map of used space. */
  157.     share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
  158.                          reference the share info structure. */
  159.     mem_backend_t *backend; /**< Memory backend backing this address space area. */
  160.  
  161.     /** Data to be used by the backend. */
  162.     mem_backend_data_t backend_data;
  163. };
  164.  
  165. extern as_t *AS_KERNEL;
  166. extern as_operations_t *as_operations;
  167.  
  168. extern spinlock_t inactive_as_with_asid_lock;
  169. extern link_t inactive_as_with_asid_head;
  170.  
  171. extern void as_init(void);
  172.  
  173. extern as_t *as_create(int flags);
  174. extern void as_destroy(as_t *as);
  175. extern void as_switch(as_t *old, as_t *new);
  176. extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
  177.  
  178. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
  179.     mem_backend_t *backend, mem_backend_data_t *backend_data);
  180. extern int as_area_destroy(as_t *as, uintptr_t address);   
  181. extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
  182. int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
  183.           as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
  184.  
  185. extern int as_area_get_flags(as_area_t *area);
  186. extern bool as_area_check_access(as_area_t *area, pf_access_t access);
  187. extern size_t as_get_size(uintptr_t base);
  188. extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
  189. extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
  190.  
  191.  
  192. /* Interface to be implemented by architectures. */
  193. #ifndef as_constructor_arch
  194. extern int as_constructor_arch(as_t *as, int flags);
  195. #endif /* !def as_constructor_arch */
  196. #ifndef as_destructor_arch
  197. extern int as_destructor_arch(as_t *as);
  198. #endif /* !def as_destructor_arch */
  199. #ifndef as_create_arch
  200. extern int as_create_arch(as_t *as, int flags);
  201. #endif /* !def as_create_arch */
  202. #ifndef as_install_arch
  203. extern void as_install_arch(as_t *as);
  204. #endif /* !def as_install_arch */
  205. #ifndef as_deinstall_arch
  206. extern void as_deinstall_arch(as_t *as);
  207. #endif /* !def as_deinstall_arch */
  208.  
  209. /* Backend declarations. */
  210. extern mem_backend_t anon_backend;
  211. extern mem_backend_t elf_backend;
  212. extern mem_backend_t phys_backend;
  213.  
  214. /* Address space area related syscalls. */
  215. extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
  216. extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
  217. extern unative_t sys_as_area_destroy(uintptr_t address);
  218.  
  219. #endif /* KERNEL */
  220.  
  221. #endif
  222.  
  223. /** @}
  224.  */
  225.