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  1. #ifndef _ASM_X86_PAGE_DEFS_H
  2. #define _ASM_X86_PAGE_DEFS_H
  3.  
  4. #include <linux/const.h>
  5. #include <linux/types.h>
  6.  
  7. /* PAGE_SHIFT determines the page size */
  8. #define PAGE_SHIFT      12
  9. #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  10. #define PAGE_MASK       (~(PAGE_SIZE-1))
  11.  
  12. #define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  13. #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  14.  
  15. #define PUD_PAGE_SIZE           (_AC(1, UL) << PUD_SHIFT)
  16. #define PUD_PAGE_MASK           (~(PUD_PAGE_SIZE-1))
  17.  
  18. #define __PHYSICAL_MASK         ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
  19. #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  20.  
  21. /* Cast *PAGE_MASK to a signed type so that it is sign-extended if
  22.    virtual addresses are 32-bits but physical addresses are larger
  23.    (ie, 32-bit PAE). */
  24. #define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
  25. #define PHYSICAL_PMD_PAGE_MASK  (((signed long)PMD_PAGE_MASK) & __PHYSICAL_MASK)
  26. #define PHYSICAL_PUD_PAGE_MASK  (((signed long)PUD_PAGE_MASK) & __PHYSICAL_MASK)
  27.  
  28. #define HPAGE_SHIFT             PMD_SHIFT
  29. #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  30. #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  31. #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  32.  
  33. #define HUGE_MAX_HSTATE 2
  34.  
  35. #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  36.  
  37. #define VM_DATA_DEFAULT_FLAGS \
  38.         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  39.          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  40.  
  41. #define __PHYSICAL_START        ALIGN(CONFIG_PHYSICAL_START, \
  42.                                       CONFIG_PHYSICAL_ALIGN)
  43.  
  44. #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
  45.  
  46. #ifdef CONFIG_X86_64
  47. #include <asm/page_64_types.h>
  48. #define IOREMAP_MAX_ORDER       (PUD_SHIFT)
  49. #else
  50. #include <asm/page_32_types.h>
  51. #define IOREMAP_MAX_ORDER       (PMD_SHIFT)
  52. #endif  /* CONFIG_X86_64 */
  53.  
  54. #ifndef __ASSEMBLY__
  55.  
  56. extern int devmem_is_allowed(unsigned long pagenr);
  57.  
  58. extern unsigned long max_low_pfn_mapped;
  59. extern unsigned long max_pfn_mapped;
  60.  
  61. static inline phys_addr_t get_max_mapped(void)
  62. {
  63.         return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
  64. }
  65.  
  66. bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
  67.  
  68. extern unsigned long init_memory_mapping(unsigned long start,
  69.                                          unsigned long end);
  70.  
  71. extern void initmem_init(void);
  72.  
  73. #endif  /* !__ASSEMBLY__ */
  74.  
  75. #endif  /* _ASM_X86_PAGE_DEFS_H */
  76.