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/* 73 * Convert a physical address to a Page Frame Number and back 74 */ 75#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 76#define __pfn_to_phys(pfn) PFN_PHYS(pfn) 77 78#define page_to_pfn __page_to_pfn 79#define pfn_to_page __pfn_to_page 80 81#endif /* __ASSEMBLY__ */ 82 83#endif 84