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