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  1. #ifndef _ASM_X86_PAGE_H
  2. #define _ASM_X86_PAGE_H
  3.  
  4. #include <linux/types.h>
  5.  
  6. #ifdef __KERNEL__
  7.  
  8. #include <asm/page_types.h>
  9.  
  10. #ifdef CONFIG_X86_64
  11. #include <asm/page_64.h>
  12. #else
  13. #include <asm/page_32.h>
  14. #endif  /* CONFIG_X86_64 */
  15.  
  16. #ifndef __ASSEMBLY__
  17.  
  18. struct page;
  19.  
  20. #include <linux/range.h>
  21. extern struct range pfn_mapped[];
  22. extern int nr_pfn_mapped;
  23.  
  24. static inline void clear_user_page(void *page, unsigned long vaddr,
  25.                                    struct page *pg)
  26. {
  27.         clear_page(page);
  28. }
  29.  
  30. static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  31.                                   struct page *topage)
  32. {
  33.         copy_page(to, from);
  34. }
  35.  
  36. #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  37.         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  38. #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  39.  
  40. #define __pa(x)         __phys_addr((unsigned long)(x))
  41. #define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
  42. /* __pa_symbol should be used for C visible symbols.
  43.    This seems to be the official gcc blessed way to do such arithmetic. */
  44. /*
  45.  * We need __phys_reloc_hide() here because gcc may assume that there is no
  46.  * overflow during __pa() calculation and can optimize it unexpectedly.
  47.  * Newer versions of gcc provide -fno-strict-overflow switch to handle this
  48.  * case properly. Once all supported versions of gcc understand it, we can
  49.  * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
  50.  */
  51. #define __pa_symbol(x) \
  52.         __phys_addr_symbol(__phys_reloc_hide((unsigned long)(x)))
  53.  
  54. #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
  55.  
  56. #define __boot_va(x)            __va(x)
  57. #define __boot_pa(x)            __pa(x)
  58.  
  59. /*
  60.  * virt_to_page(kaddr) returns a valid pointer if and only if
  61.  * virt_addr_valid(kaddr) returns true.
  62.  */
  63. #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  64. #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
  65. extern bool __virt_addr_valid(unsigned long kaddr);
  66. #define virt_addr_valid(kaddr)  __virt_addr_valid((unsigned long) (kaddr))
  67.  
  68. #endif  /* __ASSEMBLY__ */
  69.  
  70. #include <asm-generic/memory_model.h>
  71. #include <asm-generic/getorder.h>
  72.  
  73. #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  74.  
  75. #endif  /* __KERNEL__ */
  76. #endif /* _ASM_X86_PAGE_H */
  77.