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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 __ia32_PAGE_H__
  30. #define __ia32_PAGE_H__
  31.  
  32. #include <mm/page.h>
  33. #include <arch/types.h>
  34. #include <arch/mm/frame.h>
  35. #include <typedefs.h>
  36.  
  37. #define PAGE_SIZE   FRAME_SIZE
  38.  
  39. #define KA2PA(x)    ((x) - 0x80000000)
  40. #define PA2KA(x)    ((x) + 0x80000000)
  41.  
  42. /*
  43.  * Implementation of generic 4-level page table interface.
  44.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  45.  */
  46. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>22)&0x3ff)
  47. #define PTL1_INDEX_ARCH(vaddr)  0
  48. #define PTL2_INDEX_ARCH(vaddr)  0
  49. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x3ff)
  50.  
  51. #define GET_PTL0_ADDRESS_ARCH()         ((pte_t *) read_cr3())
  52. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))
  53. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  54. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  55. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
  56.  
  57. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  58. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
  59. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  60. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  61. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12)
  62.  
  63. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  64. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  65. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  66. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  67.  
  68. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  69. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  70. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  71. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  72.  
  73. struct page_specifier {
  74.     unsigned present : 1;
  75.     unsigned writeable : 1;
  76.     unsigned uaccessible : 1;
  77.     unsigned page_write_through : 1;
  78.     unsigned page_cache_disable : 1;
  79.     unsigned accessed : 1;
  80.     unsigned dirty : 1;
  81.     unsigned : 2;
  82.     unsigned avl : 3;
  83.     unsigned frame_address : 20;
  84. } __attribute__ ((packed));
  85.  
  86. typedef struct page_specifier pte_t;
  87.  
  88. static inline int get_pt_flags(pte_t *pt, index_t i)
  89. {
  90.     pte_t *p = &pt[i];
  91.    
  92.     return (
  93.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  94.         (!p->present)<<PAGE_PRESENT_SHIFT |
  95.         p->uaccessible<<PAGE_USER_SHIFT |
  96.         1<<PAGE_READ_SHIFT |
  97.         p->writeable<<PAGE_WRITE_SHIFT |
  98.         1<<PAGE_EXEC_SHIFT
  99.     );
  100. }
  101.  
  102. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  103. {
  104.     pte_t *p = &pt[i];
  105.    
  106.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  107.     p->present = !(flags & PAGE_NOT_PRESENT);
  108.     p->uaccessible = (flags & PAGE_USER) != 0;
  109.     p->writeable = (flags & PAGE_WRITE) != 0;
  110. }
  111.  
  112. extern void page_arch_init(void);
  113.  
  114. #endif
  115.