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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 <arch/mm/frame.h>
  33.  
  34. #define PAGE_WIDTH  FRAME_WIDTH
  35. #define PAGE_SIZE   FRAME_SIZE
  36.  
  37. #ifdef KERNEL
  38.  
  39. #ifndef __ASM__
  40. #   define KA2PA(x) (((__address) (x)) - 0x80000000)
  41. #   define PA2KA(x) (((__address) (x)) + 0x80000000)
  42. #else
  43. #   define KA2PA(x) ((x) - 0x80000000)
  44. #   define PA2KA(x) ((x) + 0x80000000)
  45. #endif
  46.  
  47. /*
  48.  * Implementation of generic 4-level page table interface.
  49.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  50.  */
  51. #define PTL0_ENTRIES_ARCH   1024
  52. #define PTL1_ENTRIES_ARCH   0
  53. #define PTL2_ENTRIES_ARCH   0
  54. #define PTL3_ENTRIES_ARCH   1024
  55.  
  56. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>22)&0x3ff)
  57. #define PTL1_INDEX_ARCH(vaddr)  0
  58. #define PTL2_INDEX_ARCH(vaddr)  0
  59. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x3ff)
  60.  
  61. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))
  62. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  63. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  64. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
  65.  
  66. #define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))
  67. #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12)
  68. #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
  69. #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
  70. #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12)
  71.  
  72. #define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *)(ptl0), (index_t)(i))
  73. #define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT
  74. #define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT
  75. #define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *)(ptl3), (index_t)(i))
  76.  
  77. #define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x))
  78. #define SET_PTL2_FLAGS_ARCH(ptl1, i, x)
  79. #define SET_PTL3_FLAGS_ARCH(ptl2, i, x)
  80. #define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x))
  81.  
  82. #define PTE_VALID_ARCH(p)           (*((__u32 *) (p)) != 0)
  83. #define PTE_PRESENT_ARCH(p)         ((p)->present != 0)
  84. #define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address<<FRAME_WIDTH)
  85. #define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)
  86. #define PTE_EXECUTABLE_ARCH(p)          1
  87.  
  88. #ifndef __ASM__
  89.  
  90. #include <mm/page.h>
  91. #include <arch/types.h>
  92. #include <arch/mm/frame.h>
  93. #include <typedefs.h>
  94.  
  95. /* Page fault error codes. */
  96.  
  97. /** When bit on this position is 0, the page fault was caused by a not-present page. */
  98. #define PFERR_CODE_P        (1<<0)
  99.  
  100. /** When bit on this position is 1, the page fault was caused by a write. */
  101. #define PFERR_CODE_RW       (1<<1)
  102.  
  103. /** When bit on this position is 1, the page fault was caused in user mode. */
  104. #define PFERR_CODE_US       (1<<2)
  105.  
  106. /** When bit on this position is 1, a reserved bit was set in page directory. */
  107. #define PFERR_CODE_RSVD     (1<<3) 
  108.  
  109. /** Page Table Entry. */
  110. struct page_specifier {
  111.     unsigned present : 1;
  112.     unsigned writeable : 1;
  113.     unsigned uaccessible : 1;
  114.     unsigned page_write_through : 1;
  115.     unsigned page_cache_disable : 1;
  116.     unsigned accessed : 1;
  117.     unsigned dirty : 1;
  118.     unsigned pat : 1;
  119.     unsigned global : 1;
  120.     unsigned soft_valid : 1;    /**< Valid content even if the present bit is not set. */
  121.     unsigned avl : 2;
  122.     unsigned frame_address : 20;
  123. } __attribute__ ((packed));
  124.  
  125. static inline int get_pt_flags(pte_t *pt, index_t i)
  126. {
  127.     pte_t *p = &pt[i];
  128.    
  129.     return (
  130.         (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |
  131.         (!p->present)<<PAGE_PRESENT_SHIFT |
  132.         p->uaccessible<<PAGE_USER_SHIFT |
  133.         1<<PAGE_READ_SHIFT |
  134.         p->writeable<<PAGE_WRITE_SHIFT |
  135.         1<<PAGE_EXEC_SHIFT |
  136.         p->global<<PAGE_GLOBAL_SHIFT
  137.     );
  138. }
  139.  
  140. static inline void set_pt_flags(pte_t *pt, index_t i, int flags)
  141. {
  142.     pte_t *p = &pt[i];
  143.    
  144.     p->page_cache_disable = !(flags & PAGE_CACHEABLE);
  145.     p->present = !(flags & PAGE_NOT_PRESENT);
  146.     p->uaccessible = (flags & PAGE_USER) != 0;
  147.     p->writeable = (flags & PAGE_WRITE) != 0;
  148.     p->global = (flags & PAGE_GLOBAL) != 0;
  149.    
  150.     /*
  151.      * Ensure that there is at least one bit set even if the present bit is cleared.
  152.      */
  153.     p->soft_valid = true;
  154. }
  155.  
  156. extern void page_arch_init(void);
  157. extern void page_fault(int n, istate_t *istate);
  158.  
  159. #endif /* __ASM__ */
  160.  
  161. #endif /* KERNEL */
  162.  
  163. #endif
  164.