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
  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_ELEMENTS 1024
  38 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  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_ELEMENT]);
  46 #else
  47         return 0;
  48 #endif
  49 }
  50
  51 /*
  52  * Following are macros that each numa implmentation must define.
  53  */
  54
  55 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  56 #define node_end_pfn(nid)                                               \
  57 ({                                                                      \
  58         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  59         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  60 })
  61
  62 static inline int pfn_valid(int pfn)
  63 {
  64         int nid = pfn_to_nid(pfn);
  65
  66         if (nid >= 0)
  67                 return (pfn < node_end_pfn(nid));
  68         return 0;
  69 }
  70
  71 #endif /* CONFIG_DISCONTIGMEM */
  72
  73 #ifdef CONFIG_NEED_MULTIPLE_NODES
  74 /* always use node 0 for bootmem on this numa platform */
  75 #define bootmem_arch_preferred_node(__bdata, size, align, goal, limit)  \
  76         (NODE_DATA(0)->bdata)
  77 #endif /* CONFIG_NEED_MULTIPLE_NODES */
  78
  79 #endif /* _ASM_X86_MMZONE_32_H */