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 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 */ 65