2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
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 extern void resume_map_numa_kva(pgd_t *pgd);
19 #else /* !CONFIG_NUMA */
21 static inline void resume_map_numa_kva(pgd_t *pgd) {}
23 #endif /* CONFIG_NUMA */
25 #ifdef CONFIG_DISCONTIGMEM
28 * generic node memory support, the following assumptions apply:
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
33 * for now assume that 64Gb is max amount of RAM for whole system
34 * 64Gb / 4096bytes/page = 16777216 pages
36 #define MAX_NR_PAGES 16777216
37 #define MAX_ELEMENTS 1024
38 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
40 extern s8 physnode_map[];
42 static inline int pfn_to_nid(unsigned long pfn)
45 return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
52 * Following are macros that each numa implmentation must define.
55 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
56 #define node_end_pfn(nid) \
58 pg_data_t *__pgdat = NODE_DATA(nid); \
59 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
62 static inline int pfn_valid(int pfn)
64 int nid = pfn_to_nid(pfn);
67 return (pfn < node_end_pfn(nid));
71 #endif /* CONFIG_DISCONTIGMEM */
73 #ifdef CONFIG_NEED_MULTIPLE_NODES
74 /* always use node 0 for bootmem on this numa platform */
75 #define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \
77 #endif /* CONFIG_NEED_MULTIPLE_NODES */
79 #endif /* _ASM_X86_MMZONE_32_H */