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_VMEMMAP)
50
51 /* memmap is virtually contigious. */
52 #define __pfn_to_page(pfn) (vmemmap + (pfn))
53 #define __page_to_pfn(page) ((page) - vmemmap)
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 (unsigned long)(__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
73 #ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
74 struct page;
75 /* this is useful when inlined pfn_to_page is too big */
76 extern struct page *pfn_to_page(unsigned long pfn);
77 extern unsigned long page_to_pfn(struct page *page);
78 #else
79 #define page_to_pfn __page_to_pfn
80 #define pfn_to_page __pfn_to_page
81 #endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
82
83 #endif /* __ASSEMBLY__ */
84 #endif /* __KERNEL__ */
85
86 #endif
87
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