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  1. #ifndef __ASM_MEMORY_MODEL_H
  2. #define __ASM_MEMORY_MODEL_H
  3.  
  4. #ifndef __ASSEMBLY__
  5.  
  6. #if defined(CONFIG_FLATMEM)
  7.  
  8. #ifndef ARCH_PFN_OFFSET
  9. #define ARCH_PFN_OFFSET         (0UL)
  10. #endif
  11.  
  12. #elif defined(CONFIG_DISCONTIGMEM)
  13.  
  14. #ifndef arch_pfn_to_nid
  15. #define arch_pfn_to_nid(pfn)    pfn_to_nid(pfn)
  16. #endif
  17.  
  18. #ifndef arch_local_page_offset
  19. #define arch_local_page_offset(pfn, nid)        \
  20.         ((pfn) - NODE_DATA(nid)->node_start_pfn)
  21. #endif
  22.  
  23. #endif /* CONFIG_DISCONTIGMEM */
  24.  
  25. /*
  26.  * supports 3 memory models.
  27.  */
  28. #if defined(CONFIG_FLATMEM)
  29.  
  30. #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
  31. #define __page_to_pfn(page)     ((unsigned long)((page) - mem_map) + \
  32.                                  ARCH_PFN_OFFSET)
  33. #elif defined(CONFIG_DISCONTIGMEM)
  34.  
  35. #define __pfn_to_page(pfn)                      \
  36. ({      unsigned long __pfn = (pfn);            \
  37.         unsigned long __nid = arch_pfn_to_nid(__pfn);  \
  38.         NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
  39. })
  40.  
  41. #define __page_to_pfn(pg)                                               \
  42. ({      const struct page *__pg = (pg);                                 \
  43.         struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));     \
  44.         (unsigned long)(__pg - __pgdat->node_mem_map) +                 \
  45.          __pgdat->node_start_pfn;                                       \
  46. })
  47.  
  48. #elif defined(CONFIG_SPARSEMEM_VMEMMAP)
  49.  
  50. /* memmap is virtually contiguous.  */
  51. #define __pfn_to_page(pfn)      (vmemmap + (pfn))
  52. #define __page_to_pfn(page)     (unsigned long)((page) - vmemmap)
  53.  
  54. #elif defined(CONFIG_SPARSEMEM)
  55. /*
  56.  * Note: section's mem_map is encoded to reflect its start_pfn.
  57.  * section[i].section_mem_map == mem_map's address - start_pfn;
  58.  */
  59. #define __page_to_pfn(pg)                                       \
  60. ({      const struct page *__pg = (pg);                         \
  61.         int __sec = page_to_section(__pg);                      \
  62.         (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
  63. })
  64.  
  65. #define __pfn_to_page(pfn)                              \
  66. ({      unsigned long __pfn = (pfn);                    \
  67.         struct mem_section *__sec = __pfn_to_section(__pfn);    \
  68.         __section_mem_map_addr(__sec) + __pfn;          \
  69. })
  70. #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
  71.  
  72. #define page_to_pfn __page_to_pfn
  73. #define pfn_to_page __pfn_to_page
  74.  
  75. #endif /* __ASSEMBLY__ */
  76.  
  77. #endif
  78.