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55 lines
1.1 KiB
55 lines
1.1 KiB
/* |
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* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002 |
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* |
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*/ |
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#ifndef _ASM_X86_MMZONE_32_H |
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#define _ASM_X86_MMZONE_32_H |
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#include <asm/smp.h> |
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#ifdef CONFIG_NUMA |
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extern struct pglist_data *node_data[]; |
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#define NODE_DATA(nid) (node_data[nid]) |
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#endif /* CONFIG_NUMA */ |
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#ifdef CONFIG_DISCONTIGMEM |
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/* |
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* generic node memory support, the following assumptions apply: |
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* |
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* 1) memory comes in 64Mb contiguous chunks which are either present or not |
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* 2) we will not have more than 64Gb in total |
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* |
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* for now assume that 64Gb is max amount of RAM for whole system |
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* 64Gb / 4096bytes/page = 16777216 pages |
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*/ |
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#define MAX_NR_PAGES 16777216 |
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#define MAX_SECTIONS 1024 |
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#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS) |
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extern s8 physnode_map[]; |
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static inline int pfn_to_nid(unsigned long pfn) |
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{ |
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#ifdef CONFIG_NUMA |
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return((int) physnode_map[(pfn) / PAGES_PER_SECTION]); |
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#else |
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return 0; |
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#endif |
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} |
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static inline int pfn_valid(int pfn) |
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{ |
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int nid = pfn_to_nid(pfn); |
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if (nid >= 0) |
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return (pfn < node_end_pfn(nid)); |
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return 0; |
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} |
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#define early_pfn_valid(pfn) pfn_valid((pfn)) |
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#endif /* CONFIG_DISCONTIGMEM */ |
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#endif /* _ASM_X86_MMZONE_32_H */
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