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 12 extern 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 31 extern s8 physnode_map[]; 32 33 static 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 42 static 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