blob: d58878ec899ed005ae3863be23f3e8edb4b383ae [file] [log] [blame]
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
24#define local_mapnr(kvaddr) \
25({ \
26 unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT; \
27 (__pfn - node_start_pfn(pfn_to_nid(__pfn))); \
28})
29
30#define pfn_to_page(pfn) \
31({ \
32 unsigned long __pfn = pfn; \
33 int __node = pfn_to_nid(__pfn); \
Dave Hansen408fde82005-06-23 00:07:37 -070034 &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)]; \
Linus Torvalds1da177e2005-04-16 15:20:36 -070035})
36
37#define page_to_pfn(pg) \
38({ \
39 struct page *__page = pg; \
40 struct zone *__zone = page_zone(__page); \
41 (unsigned long)(__page - __zone->zone_mem_map) \
42 + __zone->zone_start_pfn; \
43})
44#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
45/*
46 * pfn_valid should be made as fast as possible, and the current definition
47 * is valid for machines that are NUMA, but still contiguous, which is what
48 * is currently supported. A more generalised, but slower definition would
49 * be something like this - mbligh:
50 * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
51 */
52#if 1 /* M32R_FIXME */
53#define pfn_valid(pfn) (1)
54#else
55#define pfn_valid(pfn) ((pfn) < num_physpages)
56#endif
57
58/*
59 * generic node memory support, the following assumptions apply:
60 */
61
62static __inline__ int pfn_to_nid(unsigned long pfn)
63{
64 int node;
65
66 for (node = 0 ; node < MAX_NUMNODES ; node++)
67 if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
68 break;
69
70 return node;
71}
72
73static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
74{
75 return(NODE_DATA(pfn_to_nid(pfn)));
76}
77
78#endif /* CONFIG_DISCONTIGMEM */
79#endif /* _ASM_MMZONE_H_ */