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a117e66e KH |
1 | #ifndef __ASM_MEMORY_MODEL_H |
2 | #define __ASM_MEMORY_MODEL_H | |
3 | ||
8f235d1a CG |
4 | #include <linux/pfn.h> |
5 | ||
a117e66e KH |
6 | #ifndef __ASSEMBLY__ |
7 | ||
8 | #if defined(CONFIG_FLATMEM) | |
9 | ||
10 | #ifndef ARCH_PFN_OFFSET | |
11 | #define ARCH_PFN_OFFSET (0UL) | |
12 | #endif | |
13 | ||
14 | #elif defined(CONFIG_DISCONTIGMEM) | |
15 | ||
16 | #ifndef arch_pfn_to_nid | |
17 | #define arch_pfn_to_nid(pfn) pfn_to_nid(pfn) | |
18 | #endif | |
19 | ||
20 | #ifndef arch_local_page_offset | |
21 | #define arch_local_page_offset(pfn, nid) \ | |
22 | ((pfn) - NODE_DATA(nid)->node_start_pfn) | |
23 | #endif | |
24 | ||
25 | #endif /* CONFIG_DISCONTIGMEM */ | |
26 | ||
a117e66e KH |
27 | /* |
28 | * supports 3 memory models. | |
29 | */ | |
30 | #if defined(CONFIG_FLATMEM) | |
31 | ||
67de6482 AW |
32 | #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) |
33 | #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ | |
a117e66e KH |
34 | ARCH_PFN_OFFSET) |
35 | #elif defined(CONFIG_DISCONTIGMEM) | |
36 | ||
67de6482 | 37 | #define __pfn_to_page(pfn) \ |
a117e66e | 38 | ({ unsigned long __pfn = (pfn); \ |
c5d71243 | 39 | unsigned long __nid = arch_pfn_to_nid(__pfn); \ |
a117e66e KH |
40 | NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ |
41 | }) | |
42 | ||
67de6482 | 43 | #define __page_to_pfn(pg) \ |
aa462abe | 44 | ({ const struct page *__pg = (pg); \ |
a0140c1d KH |
45 | struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ |
46 | (unsigned long)(__pg - __pgdat->node_mem_map) + \ | |
47 | __pgdat->node_start_pfn; \ | |
a117e66e KH |
48 | }) |
49 | ||
8f6aac41 CL |
50 | #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |
51 | ||
af901ca1 | 52 | /* memmap is virtually contiguous. */ |
8f6aac41 | 53 | #define __pfn_to_page(pfn) (vmemmap + (pfn)) |
32272a26 | 54 | #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) |
8f6aac41 | 55 | |
a117e66e KH |
56 | #elif defined(CONFIG_SPARSEMEM) |
57 | /* | |
1a49123b | 58 | * Note: section's mem_map is encoded to reflect its start_pfn. |
a117e66e KH |
59 | * section[i].section_mem_map == mem_map's address - start_pfn; |
60 | */ | |
67de6482 | 61 | #define __page_to_pfn(pg) \ |
aa462abe | 62 | ({ const struct page *__pg = (pg); \ |
a117e66e | 63 | int __sec = page_to_section(__pg); \ |
f05b6284 | 64 | (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ |
a117e66e KH |
65 | }) |
66 | ||
67de6482 | 67 | #define __pfn_to_page(pfn) \ |
a117e66e KH |
68 | ({ unsigned long __pfn = (pfn); \ |
69 | struct mem_section *__sec = __pfn_to_section(__pfn); \ | |
70 | __section_mem_map_addr(__sec) + __pfn; \ | |
71 | }) | |
72 | #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */ | |
67de6482 | 73 | |
012dcef3 CH |
74 | /* |
75 | * Convert a physical address to a Page Frame Number and back | |
76 | */ | |
8f235d1a | 77 | #define __phys_to_pfn(paddr) PHYS_PFN(paddr) |
ae4f9769 | 78 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
012dcef3 | 79 | |
67de6482 AW |
80 | #define page_to_pfn __page_to_pfn |
81 | #define pfn_to_page __pfn_to_page | |
a117e66e KH |
82 | |
83 | #endif /* __ASSEMBLY__ */ | |
a117e66e KH |
84 | |
85 | #endif |