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