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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. #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.  
  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 as_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.                          or memcpy_to_uspace(). */
  73.  
  74. /** Address space area structure.
  75.  *
  76.  * Each as_area_t structure describes one contiguous area of virtual memory.
  77.  * In the future, it should not be difficult to support shared areas.
  78.  */
  79. struct as_area {
  80.     mutex_t lock;
  81.     int flags;      /**< Flags related to the memory represented by the address space area. */
  82.     int attributes;     /**< Attributes related to the address space area itself. */
  83.     count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
  84.     __address base;     /**< Base address of this area. */
  85.     btree_t used_space; /**< Map of used space. */
  86. };
  87.  
  88. /** Address space structure.
  89.  *
  90.  * as_t contains the list of as_areas of userspace accessible
  91.  * pages for one or more tasks. Ranges of kernel memory pages are not
  92.  * supposed to figure in the list as they are shared by all tasks and
  93.  * set up during system initialization.
  94.  */
  95. struct as {
  96.     /** Protected by asidlock. */
  97.     link_t inactive_as_with_asid_link;
  98.  
  99.     mutex_t lock;
  100.  
  101.     /** Number of processors on wich is this address space active. */
  102.     count_t refcount;
  103.  
  104.     /** B+tree of address space areas. */
  105.     btree_t as_area_btree;
  106.  
  107.     /** Page table pointer. Constant on architectures that use global page hash table. */
  108.     pte_t *page_table;
  109.  
  110.     /** Address space identifier. Constant on architectures that do not support ASIDs.*/
  111.     asid_t asid;
  112. };
  113.  
  114. struct as_operations {
  115.     pte_t *(* page_table_create)(int flags);
  116.     void (* page_table_lock)(as_t *as, bool lock);
  117.     void (* page_table_unlock)(as_t *as, bool unlock);
  118. };
  119. typedef struct as_operations as_operations_t;
  120.  
  121. extern as_t *AS_KERNEL;
  122. extern as_operations_t *as_operations;
  123.  
  124. extern spinlock_t as_lock;
  125. extern link_t inactive_as_with_asid_head;
  126.  
  127. extern void as_init(void);
  128. extern as_t *as_create(int flags);
  129. extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs);
  130. extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
  131. extern int as_area_destroy(as_t *as, __address address);
  132. extern void as_set_mapping(as_t *as, __address page, __address frame);
  133. extern int as_page_fault(__address page, istate_t *istate);
  134. extern void as_switch(as_t *old, as_t *new);
  135. extern void as_free(as_t *as);
  136. extern int as_area_steal(task_t *src_task, __address src_base, size_t acc_size, __address dst_base);
  137. extern size_t as_get_size(__address base);
  138.  
  139. /* Interface to be implemented by architectures. */
  140. #ifndef as_install_arch
  141. extern void as_install_arch(as_t *as);
  142. #endif /* !def as_install_arch */
  143.  
  144. /* Address space area related syscalls. */
  145. extern __native sys_as_area_create(__address address, size_t size, int flags);
  146. extern __native sys_as_area_resize(__address address, size_t size, int flags);
  147. extern __native sys_as_area_destroy(__address address);
  148.  
  149. #endif /* KERNEL */
  150.  
  151. #endif
  152.