/arch/x86/include/asm/pgtable_32.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C++ Header · 96 lines · 57 code · 16 blank · 23 comment · 4 complexity · c43ded71bdbe164516d0aa0f3b0e13b5 MD5 · raw file 

    

  1. #ifndef _ASM_X86_PGTABLE_32_H
    2. 

  2. #define _ASM_X86_PGTABLE_32_H
    3. 

  3. 

  4. #include <asm/pgtable_32_types.h>
    5. 

  5. 

  6. /*
    7. 

  7.  * The Linux memory management assumes a three-level page table setup. On
    8. 

  8.  * the i386, we use that, but "fold" the mid level into the top-level page
    9. 

  9.  * table, so that we physically have the same two-level page table as the
    10. 

  10.  * i386 mmu expects.
    11. 

  11.  *
    12. 

  12.  * This file contains the functions and defines necessary to modify and use
    13. 

  13.  * the i386 page table tree.
    14. 

  14.  */
    15. 

  15. #ifndef __ASSEMBLY__
    16. 

  16. #include <asm/processor.h>
    17. 

  17. #include <asm/fixmap.h>
    18. 

  18. #include <linux/threads.h>
    19. 

  19. #include <asm/paravirt.h>
    20. 

  20. 

  21. #include <linux/bitops.h>
    22. 

  22. #include <linux/list.h>
    23. 

  23. #include <linux/spinlock.h>
    24. 

  24. 

  25. struct mm_struct;
    26. 

  26. struct vm_area_struct;
    27. 

  27. 

  28. extern pgd_t swapper_pg_dir[1024];
    29. 

  29. 

  30. static inline void pgtable_cache_init(void) { }
    31. 

  31. static inline void check_pgt_cache(void) { }
    32. 

  32. void paging_init(void);
    33. 

  33. 

  34. extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
    35. 

  35. 

  36. 

  37. /*
    38. 

  38.  * Define this if things work differently on an i386 and an i486:
    39. 

  39.  * it will (on an i486) warn about kernel memory accesses that are
    40. 

  40.  * done without a 'access_ok(VERIFY_WRITE,..)'
    41. 

  41.  */
    42. 

  42. #undef TEST_ACCESS_OK
    43. 

  43. 

  44. #ifdef CONFIG_X86_PAE
    45. 

  45. # include <asm/pgtable-3level.h>
    46. 

  46. #else
    47. 

  47. # include <asm/pgtable-2level.h>
    48. 

  48. #endif
    49. 

  49. 

  50. #if defined(CONFIG_HIGHPTE)
    51. 

  51. #define __KM_PTE			\
    52. 

  52. 	(in_nmi() ? KM_NMI_PTE : 	\
    53. 

  53. 	 in_irq() ? KM_IRQ_PTE :	\
    54. 

  54. 	 KM_PTE0)
    55. 

  55. #define pte_offset_map(dir, address)					\
    56. 

  56. 	((pte_t *)kmap_atomic(pmd_page(*(dir)), __KM_PTE) +		\
    57. 

  57. 	 pte_index((address)))
    58. 

  58. #define pte_offset_map_nested(dir, address)				\
    59. 

  59. 	((pte_t *)kmap_atomic(pmd_page(*(dir)), KM_PTE1) +		\
    60. 

  60. 	 pte_index((address)))
    61. 

  61. #define pte_unmap(pte) kunmap_atomic((pte), __KM_PTE)
    62. 

  62. #define pte_unmap_nested(pte) kunmap_atomic((pte), KM_PTE1)
    63. 

  63. #else
    64. 

  64. #define pte_offset_map(dir, address)					\
    65. 

  65. 	((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
    66. 

  66. #define pte_offset_map_nested(dir, address) pte_offset_map((dir), (address))
    67. 

  67. #define pte_unmap(pte) do { } while (0)
    68. 

  68. #define pte_unmap_nested(pte) do { } while (0)
    69. 

  69. #endif
    70. 

  70. 

  71. /* Clear a kernel PTE and flush it from the TLB */
    72. 

  72. #define kpte_clear_flush(ptep, vaddr)		\
    73. 

  73. do {						\
    74. 

  74. 	pte_clear(&init_mm, (vaddr), (ptep));	\
    75. 

  75. 	__flush_tlb_one((vaddr));		\
    76. 

  76. } while (0)
    77. 

  77. 

  78. /*
    79. 

  79.  * The i386 doesn't have any external MMU info: the kernel page
    80. 

  80.  * tables contain all the necessary information.
    81. 

  81.  */
    82. 

  82. #define update_mmu_cache(vma, address, ptep) do { } while (0)
    83. 

  83. 

  84. #endif /* !__ASSEMBLY__ */
    85. 

  85. 

  86. /*
    87. 

  87.  * kern_addr_valid() is (1) for FLATMEM and (0) for
    88. 

  88.  * SPARSEMEM and DISCONTIGMEM
    89. 

  89.  */
    90. 

  90. #ifdef CONFIG_FLATMEM
    91. 

  91. #define kern_addr_valid(addr)	(1)
    92. 

  92. #else
    93. 

  93. #define kern_addr_valid(kaddr)	(0)
    94. 

  94. #endif
    95. 

  95. 

  96. #endif /* _ASM_X86_PGTABLE_32_H */
    97.