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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 __PAGE_H__
  30. #define __PAGE_H__
  31.  
  32. #include <arch/mm/asid.h>
  33. #include <arch/types.h>
  34. #include <typedefs.h>
  35.  
  36. #define PAGE_CACHEABLE_SHIFT        0
  37. #define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT
  38. #define PAGE_PRESENT_SHIFT      1
  39. #define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT
  40. #define PAGE_USER_SHIFT         2
  41. #define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
  42. #define PAGE_READ_SHIFT         3
  43. #define PAGE_WRITE_SHIFT        4
  44. #define PAGE_EXEC_SHIFT         5
  45. #define PAGE_GLOBAL_SHIFT       6
  46.  
  47. #define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
  48. #define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
  49.  
  50. #define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
  51. #define PAGE_NOT_PRESENT    (1<<PAGE_PRESENT_SHIFT)
  52.  
  53. #define PAGE_USER       (1<<PAGE_USER_SHIFT)
  54. #define PAGE_KERNEL     (0<<PAGE_USER_SHIFT)
  55.  
  56. #define PAGE_READ       (1<<PAGE_READ_SHIFT)
  57. #define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
  58. #define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
  59.  
  60. #define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)
  61.  
  62. /** Operations to manipulate page mappings. */
  63. struct page_operations {
  64.     void (* mapping_insert)(as_t *as, __address page, __address frame, int flags);
  65.     pte_t *(* mapping_find)(as_t *as, __address page);
  66. };
  67. typedef struct page_operations page_operations_t;
  68.  
  69. extern page_operations_t *page_operations;
  70.  
  71. extern void page_init(void);
  72. extern void page_mapping_insert(as_t *as, __address page, __address frame, int flags);
  73. extern pte_t *page_mapping_find(as_t *as, __address page);
  74. extern pte_t *page_table_create(int flags);
  75. extern void map_structure(__address s, size_t size);
  76.  
  77. #endif
  78.