release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/mmzone_32.h

   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 */