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 ({ 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 contigious. */ 51 #define __pfn_to_page(pfn) (vmemmap + (pfn)) 52 #define __page_to_pfn(page) ((page) - vmemmap) 53 54 #elif defined(CONFIG_SPARSEMEM) 55 /* 56 * Note: section's mem_map is encorded 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 ({ 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 #ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE 73 struct page; 74 /* this is useful when inlined pfn_to_page is too big */ 75 extern struct page *pfn_to_page(unsigned long pfn); 76 extern unsigned long page_to_pfn(struct page *page); 77 #else 78 #define page_to_pfn __page_to_pfn 79 #define pfn_to_page __pfn_to_page 80 #endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */ 81 82 #endif /* __ASSEMBLY__ */ 83 84 #endif 85