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