diff options
Diffstat (limited to 'include/asm-generic/memory_model.h')
-rw-r--r-- | include/asm-generic/memory_model.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h new file mode 100644 index 000000000000..0cfb086dd373 --- /dev/null +++ b/include/asm-generic/memory_model.h | |||
@@ -0,0 +1,77 @@ | |||
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 | ||