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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/types.h>
  33. #include <arch/mm/page.h>
  34. #include <typedefs.h>
  35.  
  36. #define PAGE_NOT_CACHEABLE      (0<<0)
  37. #define PAGE_CACHEABLE          (1<<0)
  38.  
  39. #define PAGE_PRESENT            (0<<1)
  40. #define PAGE_NOT_PRESENT        (1<<1)
  41.  
  42. #define PAGE_USER               (1<<2)
  43. #define PAGE_KERNEL             (0<<2)
  44.  
  45. #define PAGE_READ       (1<<3)
  46. #define PAGE_WRITE      (1<<4)
  47. #define PAGE_EXEC       (1<<5)
  48.  
  49. /*
  50.  * This is the generic 4-level page table interface.
  51.  * Architectures are supposed to implement *_ARCH macros.
  52.  */
  53.  
  54. /*
  55.  * These macros process vaddr and extract those portions
  56.  * of it that function as indices to respective page tables.
  57.  */
  58. #define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
  59. #define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
  60. #define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
  61. #define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
  62.  
  63. /*
  64.  * These macros traverse the 4-level tree of page tables,
  65.  * each descending by one level.
  66.  */
  67. #define GET_PTL1_ADDRESS(ptl0, i)   GET_PTL1_ADDRESS_ARCH(ptl0, i)
  68. #define GET_PTL2_ADDRESS(ptl1, i)   GET_PTL2_ADDRESS_ARCH(ptl1, i)
  69. #define GET_PTL3_ADDRESS(ptl2, i)   GET_PTL3_ADDRESS_ARCH(ptl2, i)
  70. #define GET_FRAME_ADDRESS(ptl3, i)  GET_FRAME_ADDRESS_ARCH(ptl3, i)
  71.  
  72. /*
  73.  * These macros are provided to change shape of the 4-level
  74.  * tree of page tables on respective level.
  75.  */
  76. #define SET_PTL1_ADDRESS(ptl0, i, a)    SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
  77. #define SET_PTL2_ADDRESS(ptl1, i, a)    SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  78. #define SET_PTL3_ADDRESS(ptl2, i, a)    SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  79. #define SET_FRAME_ADDRESS(ptl3, i, a)   SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
  80.  
  81. /*
  82.  * These macros are provided to set/clear various flags within the page tables.
  83.  */
  84. #define SET_PTL1_FLAGS(ptl0, i, x)  SET_PTL1_FLAGS_ARCH(ptl0, i, x)
  85. #define SET_PTL2_FLAGS(ptl1, i, x)  SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  86. #define SET_PTL3_FLAGS(ptl2, i, x)  SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  87. #define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x)
  88.  
  89.  
  90. extern void page_init(void);
  91. extern void map_page_to_frame(__address page, __address frame, int flags, __address root);
  92. extern void map_structure(__address s, size_t size);
  93.  
  94. #endif
  95.