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 /* summit or generic arch */ 17 #include <asm/srat.h> 18 19 extern int get_memcfg_numa_flat(void); 20 /* 21 * This allows any one NUMA architecture to be compiled 22 * for, and still fall back to the flat function if it 23 * fails. 24 */ 25 static inline void get_memcfg_numa(void) 26 { 27 28 if (get_memcfg_numaq()) 29 return; 30 if (get_memcfg_from_srat()) 31 return; 32 get_memcfg_numa_flat(); 33 } 34 35 extern void resume_map_numa_kva(pgd_t *pgd); 36 37 #else /* !CONFIG_NUMA */ 38 39 #define get_memcfg_numa get_memcfg_numa_flat 40 41 static inline void resume_map_numa_kva(pgd_t *pgd) {} 42 43 #endif /* CONFIG_NUMA */ 44 45 #ifdef CONFIG_DISCONTIGMEM 46 47 /* 48 * generic node memory support, the following assumptions apply: 49 * 50 * 1) memory comes in 64Mb contiguous chunks which are either present or not 51 * 2) we will not have more than 64Gb in total 52 * 53 * for now assume that 64Gb is max amount of RAM for whole system 54 * 64Gb / 4096bytes/page = 16777216 pages 55 */ 56 #define MAX_NR_PAGES 16777216 57 #define MAX_ELEMENTS 1024 58 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS) 59 60 extern s8 physnode_map[]; 61 62 static inline int pfn_to_nid(unsigned long pfn) 63 { 64 #ifdef CONFIG_NUMA 65 return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]); 66 #else 67 return 0; 68 #endif 69 } 70 71 /* 72 * Following are macros that each numa implmentation must define. 73 */ 74 75 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) 76 #define node_end_pfn(nid) \ 77 ({ \ 78 pg_data_t *__pgdat = NODE_DATA(nid); \ 79 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \ 80 }) 81 82 static inline int pfn_valid(int pfn) 83 { 84 int nid = pfn_to_nid(pfn); 85 86 if (nid >= 0) 87 return (pfn < node_end_pfn(nid)); 88 return 0; 89 } 90 91 #endif /* CONFIG_DISCONTIGMEM */ 92 93 #ifdef CONFIG_NEED_MULTIPLE_NODES 94 /* always use node 0 for bootmem on this numa platform */ 95 #define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \ 96 (NODE_DATA(0)->bdata) 97 #endif /* CONFIG_NEED_MULTIPLE_NODES */ 98 99 #endif /* _ASM_X86_MMZONE_32_H */ 100