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KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -08001#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
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080026/*
27 * supports 3 memory models.
28 */
29#if defined(CONFIG_FLATMEM)
30
Andy Whitcroft67de6482006-06-23 02:03:12 -070031#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
32#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080033 ARCH_PFN_OFFSET)
34#elif defined(CONFIG_DISCONTIGMEM)
35
Andy Whitcroft67de6482006-06-23 02:03:12 -070036#define __pfn_to_page(pfn) \
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080037({ 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
Andy Whitcroft67de6482006-06-23 02:03:12 -070042#define __page_to_pfn(pg) \
KAMEZAWA Hiroyukia0140c12006-03-27 01:15:55 -080043({ 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; \
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080047})
48
49#elif defined(CONFIG_SPARSEMEM)
50/*
51 * Note: section's mem_map is encorded to reflect its start_pfn.
52 * section[i].section_mem_map == mem_map's address - start_pfn;
53 */
Andy Whitcroft67de6482006-06-23 02:03:12 -070054#define __page_to_pfn(pg) \
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080055({ struct page *__pg = (pg); \
56 int __sec = page_to_section(__pg); \
57 __pg - __section_mem_map_addr(__nr_to_section(__sec)); \
58})
59
Andy Whitcroft67de6482006-06-23 02:03:12 -070060#define __pfn_to_page(pfn) \
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080061({ unsigned long __pfn = (pfn); \
62 struct mem_section *__sec = __pfn_to_section(__pfn); \
63 __section_mem_map_addr(__sec) + __pfn; \
64})
65#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
Andy Whitcroft67de6482006-06-23 02:03:12 -070066
67#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
68struct page;
69/* this is useful when inlined pfn_to_page is too big */
70extern struct page *pfn_to_page(unsigned long pfn);
71extern unsigned long page_to_pfn(struct page *page);
72#else
73#define page_to_pfn __page_to_pfn
74#define pfn_to_page __pfn_to_page
KAMEZAWA Hiroyukia117e662006-03-27 01:15:25 -080075#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
76
77#endif /* __ASSEMBLY__ */
78#endif /* __KERNEL__ */
79
80#endif