6 #ifndef _ASM_X86_MMZONE_32_H
7 #define _ASM_X86_MMZONE_32_H
12 extern struct pglist_data *node_data[];
13 #define NODE_DATA(nid) (node_data[nid])
15 #include <asm/numaq.h>
17 #endif /* CONFIG_NUMA */
19 #ifdef CONFIG_DISCONTIGMEM
22 * generic node memory support, the following assumptions apply:
24 * 1) memory comes in 64Mb contiguous chunks which are either present or not
25 * 2) we will not have more than 64Gb in total
27 * for now assume that 64Gb is max amount of RAM for whole system
28 * 64Gb / 4096bytes/page = 16777216 pages
30 #define MAX_NR_PAGES 16777216
31 #define MAX_SECTIONS 1024
32 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
34 extern s8 physnode_map[];
36 static inline int pfn_to_nid(unsigned long pfn)
39 return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
45 static inline int pfn_valid(int pfn)
47 int nid = pfn_to_nid(pfn);
50 return (pfn < node_end_pfn(nid));
54 #define early_pfn_valid(pfn) pfn_valid((pfn))
56 #endif /* CONFIG_DISCONTIGMEM */
58 #endif /* _ASM_X86_MMZONE_32_H */