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Linux/include/asm-generic/memory_model.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __ASM_MEMORY_MODEL_H
  3 #define __ASM_MEMORY_MODEL_H
  4 
  5 #include <linux/pfn.h>
  6 
  7 #ifndef __ASSEMBLY__
  8 
  9 #if defined(CONFIG_FLATMEM)
 10 
 11 #ifndef ARCH_PFN_OFFSET
 12 #define ARCH_PFN_OFFSET         (0UL)
 13 #endif
 14 
 15 #elif defined(CONFIG_DISCONTIGMEM)
 16 
 17 #ifndef arch_pfn_to_nid
 18 #define arch_pfn_to_nid(pfn)    pfn_to_nid(pfn)
 19 #endif
 20 
 21 #ifndef arch_local_page_offset
 22 #define arch_local_page_offset(pfn, nid)        \
 23         ((pfn) - NODE_DATA(nid)->node_start_pfn)
 24 #endif
 25 
 26 #endif /* CONFIG_DISCONTIGMEM */
 27 
 28 /*
 29  * supports 3 memory models.
 30  */
 31 #if defined(CONFIG_FLATMEM)
 32 
 33 #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
 34 #define __page_to_pfn(page)     ((unsigned long)((page) - mem_map) + \
 35                                  ARCH_PFN_OFFSET)
 36 #elif defined(CONFIG_DISCONTIGMEM)
 37 
 38 #define __pfn_to_page(pfn)                      \
 39 ({      unsigned long __pfn = (pfn);            \
 40         unsigned long __nid = arch_pfn_to_nid(__pfn);  \
 41         NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
 42 })
 43 
 44 #define __page_to_pfn(pg)                                               \
 45 ({      const struct page *__pg = (pg);                                 \
 46         struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));     \
 47         (unsigned long)(__pg - __pgdat->node_mem_map) +                 \
 48          __pgdat->node_start_pfn;                                       \
 49 })
 50 
 51 #elif defined(CONFIG_SPARSEMEM_VMEMMAP)
 52 
 53 /* memmap is virtually contiguous.  */
 54 #define __pfn_to_page(pfn)      (vmemmap + (pfn))
 55 #define __page_to_pfn(page)     (unsigned long)((page) - vmemmap)
 56 
 57 #elif defined(CONFIG_SPARSEMEM)
 58 /*
 59  * Note: section's mem_map is encoded to reflect its start_pfn.
 60  * section[i].section_mem_map == mem_map's address - start_pfn;
 61  */
 62 #define __page_to_pfn(pg)                                       \
 63 ({      const struct page *__pg = (pg);                         \
 64         int __sec = page_to_section(__pg);                      \
 65         (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
 66 })
 67 
 68 #define __pfn_to_page(pfn)                              \
 69 ({      unsigned long __pfn = (pfn);                    \
 70         struct mem_section *__sec = __pfn_to_section(__pfn);    \
 71         __section_mem_map_addr(__sec) + __pfn;          \
 72 })
 73 #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
 74 
 75 /*
 76  * Convert a physical address to a Page Frame Number and back
 77  */
 78 #define __phys_to_pfn(paddr)    PHYS_PFN(paddr)
 79 #define __pfn_to_phys(pfn)      PFN_PHYS(pfn)
 80 
 81 #define page_to_pfn __page_to_pfn
 82 #define pfn_to_page __pfn_to_page
 83 
 84 #endif /* __ASSEMBLY__ */
 85 
 86 #endif
 87 

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