1/*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
3 *
4 */
5
6#ifndef _ASM_X86_MMZONE_32_H
7#define _ASM_X86_MMZONE_32_H
8
9#include <asm/smp.h>
10
11#ifdef CONFIG_NUMA
12extern struct pglist_data *node_data[];
13#define NODE_DATA(nid)	(node_data[nid])
14#endif /* CONFIG_NUMA */
15
16#ifdef CONFIG_DISCONTIGMEM
17
18/*
19 * generic node memory support, the following assumptions apply:
20 *
21 * 1) memory comes in 64Mb contiguous chunks which are either present or not
22 * 2) we will not have more than 64Gb in total
23 *
24 * for now assume that 64Gb is max amount of RAM for whole system
25 *    64Gb / 4096bytes/page = 16777216 pages
26 */
27#define MAX_NR_PAGES 16777216
28#define MAX_SECTIONS 1024
29#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
30
31extern s8 physnode_map[];
32
33static inline int pfn_to_nid(unsigned long pfn)
34{
35#ifdef CONFIG_NUMA
36	return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
37#else
38	return 0;
39#endif
40}
41
42static inline int pfn_valid(int pfn)
43{
44	int nid = pfn_to_nid(pfn);
45
46	if (nid >= 0)
47		return (pfn < node_end_pfn(nid));
48	return 0;
49}
50
51#define early_pfn_valid(pfn)	pfn_valid((pfn))
52
53#endif /* CONFIG_DISCONTIGMEM */
54
55#endif /* _ASM_X86_MMZONE_32_H */
56