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/* 27 * supports 3 memory models. 28 */ 29#if defined(CONFIG_FLATMEM) 30 31#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 32#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ 33 ARCH_PFN_OFFSET) 34#elif defined(CONFIG_DISCONTIGMEM) 35 36#define __pfn_to_page(pfn) \ 37({ unsigned long __pfn = (pfn); \ 38 unsigned long __nid = arch_pfn_to_nid(pfn); \ 39 NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ 40}) 41 42#define __page_to_pfn(pg) \ 43({ struct page *__pg = (pg); \ 44 struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ 45 (unsigned long)(__pg - __pgdat->node_mem_map) + \ 46 __pgdat->node_start_pfn; \ 47}) 48 49#elif defined(CONFIG_SPARSEMEM) 50/* 51 * Note: section's mem_map is encorded to reflect its start_pfn. 52 * section[i].section_mem_map == mem_map's address - start_pfn; 53 */ 54#define __page_to_pfn(pg) \ 55({ struct page *__pg = (pg); \ 56 int __sec = page_to_section(__pg); \ 57 (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ 58}) 59 60#define __pfn_to_page(pfn) \ 61({ unsigned long __pfn = (pfn); \ 62 struct mem_section *__sec = __pfn_to_section(__pfn); \ 63 __section_mem_map_addr(__sec) + __pfn; \ 64}) 65#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */ 66 67#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE 68struct page; 69/* this is useful when inlined pfn_to_page is too big */ 70extern struct page *pfn_to_page(unsigned long pfn); 71extern unsigned long page_to_pfn(struct page *page); 72#else 73#define page_to_pfn __page_to_pfn 74#define pfn_to_page __pfn_to_page 75#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */ 76 77#endif /* __ASSEMBLY__ */ 78#endif /* __KERNEL__ */ 79 80#endif 81