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  1. #ifndef _ASM_X86_PGTABLE_32_H
  2. #define _ASM_X86_PGTABLE_32_H
  3.  
  4. #include <asm/pgtable_32_types.h>
  5.  
  6. /*
  7.  * The Linux memory management assumes a three-level page table setup. On
  8.  * the i386, we use that, but "fold" the mid level into the top-level page
  9.  * table, so that we physically have the same two-level page table as the
  10.  * i386 mmu expects.
  11.  *
  12.  * This file contains the functions and defines necessary to modify and use
  13.  * the i386 page table tree.
  14.  */
  15. #ifndef __ASSEMBLY__
  16. #include <asm/processor.h>
  17. #include <asm/fixmap.h>
  18. #include <linux/threads.h>
  19.  
  20. #include <linux/bitops.h>
  21. #include <linux/list.h>
  22. #include <linux/spinlock.h>
  23.  
  24. struct mm_struct;
  25. struct vm_area_struct;
  26.  
  27. extern pgd_t swapper_pg_dir[1024];
  28. extern pgd_t initial_page_table[1024];
  29.  
  30. static inline void pgtable_cache_init(void) { }
  31. static inline void check_pgt_cache(void) { }
  32. void paging_init(void);
  33.  
  34. /*
  35.  * Define this if things work differently on an i386 and an i486:
  36.  * it will (on an i486) warn about kernel memory accesses that are
  37.  * done without a 'access_ok(VERIFY_WRITE,..)'
  38.  */
  39. #undef TEST_ACCESS_OK
  40.  
  41. #ifdef CONFIG_X86_PAE
  42. # include <asm/pgtable-3level.h>
  43. #else
  44. # include <asm/pgtable-2level.h>
  45. #endif
  46.  
  47. #if defined(CONFIG_HIGHPTE)
  48. #define pte_offset_map(dir, address)                                    \
  49.         ((pte_t *)kmap_atomic(pmd_page(*(dir))) +               \
  50.          pte_index((address)))
  51. #define pte_unmap(pte) kunmap_atomic((pte))
  52. #else
  53. #define pte_offset_map(dir, address)                                    \
  54.         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
  55. #define pte_unmap(pte) do { } while (0)
  56. #endif
  57.  
  58. /* Clear a kernel PTE and flush it from the TLB */
  59. #define kpte_clear_flush(ptep, vaddr)           \
  60. do {                                            \
  61.         pte_clear(&init_mm, (vaddr), (ptep));   \
  62.         __flush_tlb_one((vaddr));               \
  63. } while (0)
  64.  
  65. #endif /* !__ASSEMBLY__ */
  66.  
  67. /*
  68.  * kern_addr_valid() is (1) for FLATMEM and (0) for
  69.  * SPARSEMEM and DISCONTIGMEM
  70.  */
  71. #ifdef CONFIG_FLATMEM
  72. #define kern_addr_valid(addr)   (1)
  73. #else
  74. #define kern_addr_valid(kaddr)  (0)
  75. #endif
  76.  
  77. #endif /* _ASM_X86_PGTABLE_32_H */
  78.