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mmzone_32.h
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1 /*
2  * Written by Pat Gaughen ([email protected]) 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
12 extern struct pglist_data *node_data[];
13 #define NODE_DATA(nid) (node_data[nid])
14 
15 #include <asm/numaq.h>
16 
17 extern void resume_map_numa_kva(pgd_t *pgd);
18 
19 #else /* !CONFIG_NUMA */
20 
21 static inline void resume_map_numa_kva(pgd_t *pgd) {}
22 
23 #endif /* CONFIG_NUMA */
24 
25 #ifdef CONFIG_DISCONTIGMEM
26 
27 /*
28  * generic node memory support, the following assumptions apply:
29  *
30  * 1) memory comes in 64Mb contiguous chunks which are either present or not
31  * 2) we will not have more than 64Gb in total
32  *
33  * for now assume that 64Gb is max amount of RAM for whole system
34  * 64Gb / 4096bytes/page = 16777216 pages
35  */
36 #define MAX_NR_PAGES 16777216
37 #define MAX_SECTIONS 1024
38 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
39 
40 extern s8 physnode_map[];
41 
42 static inline int pfn_to_nid(unsigned long pfn)
43 {
44 #ifdef CONFIG_NUMA
45  return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
46 #else
47  return 0;
48 #endif
49 }
50 
51 static inline int pfn_valid(int pfn)
52 {
53  int nid = pfn_to_nid(pfn);
54 
55  if (nid >= 0)
56  return (pfn < node_end_pfn(nid));
57  return 0;
58 }
59 
60 #define early_pfn_valid(pfn) pfn_valid((pfn))
61 
62 #endif /* CONFIG_DISCONTIGMEM */
63 
64 #endif /* _ASM_X86_MMZONE_32_H */