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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 |