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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_PAGE_H_
  36. #define KERN_PAGE_H_
  37.  
  38. #include <arch/mm/asid.h>
  39. #include <arch/types.h>
  40. #include <typedefs.h>
  41. #include <memstr.h>
  42.  
  43. #define PAGE_CACHEABLE_SHIFT        0
  44. #define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT
  45. #define PAGE_PRESENT_SHIFT      1
  46. #define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT
  47. #define PAGE_USER_SHIFT         2
  48. #define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
  49. #define PAGE_READ_SHIFT         3
  50. #define PAGE_WRITE_SHIFT        4
  51. #define PAGE_EXEC_SHIFT         5
  52. #define PAGE_GLOBAL_SHIFT       6
  53.  
  54. #define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
  55. #define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
  56.  
  57. #define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
  58. #define PAGE_NOT_PRESENT    (1<<PAGE_PRESENT_SHIFT)
  59.  
  60. #define PAGE_USER       (1<<PAGE_USER_SHIFT)
  61. #define PAGE_KERNEL     (0<<PAGE_USER_SHIFT)
  62.  
  63. #define PAGE_READ       (1<<PAGE_READ_SHIFT)
  64. #define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
  65. #define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
  66.  
  67. #define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)
  68.  
  69.  
  70. /**
  71.  * Macro for computing page color.
  72.  */
  73. #define PAGE_COLOR(va)      (((va) >> PAGE_WIDTH) & ((1 << PAGE_COLOR_BITS) - 1))
  74.  
  75. /** Page fault access type. */
  76. enum pf_access {
  77.     PF_ACCESS_READ,
  78.     PF_ACCESS_WRITE,
  79.     PF_ACCESS_EXEC
  80. };
  81. typedef enum pf_access pf_access_t;
  82.  
  83. /** Operations to manipulate page mappings. */
  84. struct page_mapping_operations {
  85.     void (* mapping_insert)(as_t *as, uintptr_t page, uintptr_t frame, int flags);
  86.     void (* mapping_remove)(as_t *as, uintptr_t page);
  87.     pte_t *(* mapping_find)(as_t *as, uintptr_t page);
  88. };
  89. typedef struct page_mapping_operations page_mapping_operations_t;
  90.  
  91. extern page_mapping_operations_t *page_mapping_operations;
  92.  
  93. extern void page_init(void);
  94. extern void page_table_lock(as_t *as, bool lock);
  95. extern void page_table_unlock(as_t *as, bool unlock);
  96. extern void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int flags);
  97. extern void page_mapping_remove(as_t *as, uintptr_t page);
  98. extern pte_t *page_mapping_find(as_t *as, uintptr_t page);
  99. extern pte_t *page_table_create(int flags);
  100. extern void page_table_destroy(pte_t *page_table);
  101. extern void map_structure(uintptr_t s, size_t size);
  102. extern uintptr_t hw_map(uintptr_t physaddr, size_t size);
  103.  
  104. #endif
  105.  
  106. /** @}
  107.  */
  108.