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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
3 *
4 */
5
6#ifndef _ASM_MMZONE_H_
7#define _ASM_MMZONE_H_
8
9#include <asm/smp.h>
10
11#ifdef CONFIG_DISCONTIGMEM
12
13extern struct pglist_data *node_data[];
14#define NODE_DATA(nid) (node_data[nid])
15
16#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
18#define node_end_pfn(nid) \
19({ \
20 pg_data_t *__pgdat = NODE_DATA(nid); \
21 __pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1; \
22})
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#define pfn_to_page(pfn) \
25({ \
26 unsigned long __pfn = pfn; \
27 int __node = pfn_to_nid(__pfn); \
Dave Hansen408fde82005-06-23 00:07:37 -070028 &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)]; \
Linus Torvalds1da177e2005-04-16 15:20:36 -070029})
30
31#define page_to_pfn(pg) \
32({ \
33 struct page *__page = pg; \
34 struct zone *__zone = page_zone(__page); \
35 (unsigned long)(__page - __zone->zone_mem_map) \
36 + __zone->zone_start_pfn; \
37})
38#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
39/*
40 * pfn_valid should be made as fast as possible, and the current definition
41 * is valid for machines that are NUMA, but still contiguous, which is what
42 * is currently supported. A more generalised, but slower definition would
43 * be something like this - mbligh:
44 * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
45 */
46#if 1 /* M32R_FIXME */
47#define pfn_valid(pfn) (1)
48#else
49#define pfn_valid(pfn) ((pfn) < num_physpages)
50#endif
51
52/*
53 * generic node memory support, the following assumptions apply:
54 */
55
56static __inline__ int pfn_to_nid(unsigned long pfn)
57{
58 int node;
59
60 for (node = 0 ; node < MAX_NUMNODES ; node++)
61 if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
62 break;
63
64 return node;
65}
66
67static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
68{
69 return(NODE_DATA(pfn_to_nid(pfn)));
70}
71
72#endif /* CONFIG_DISCONTIGMEM */
73#endif /* _ASM_MMZONE_H_ */