projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a117e66e KH |
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 | ||
| a0140c1d KH |
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; \ | |
| a117e66e KH |
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 |