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 void resume_map_numa_kva(pgd_t *pgd);
  20
  21 #else /* !CONFIG_NUMA */
  22
  23 static inline void resume_map_numa_kva(pgd_t *pgd) {}
  24
  25 #endif /* CONFIG_NUMA */
  26
  27 #ifdef CONFIG_DISCONTIGMEM
  28
  29 /*
  30  * generic node memory support, the following assumptions apply:
  31  *
  32  * 1) memory comes in 64Mb contiguous chunks which are either present or not
  33  * 2) we will not have more than 64Gb in total
  34  *
  35  * for now assume that 64Gb is max amount of RAM for whole system
  36  *    64Gb / 4096bytes/page = 16777216 pages
  37  */
  38 #define MAX_NR_PAGES 16777216
  39 #define MAX_ELEMENTS 1024
  40 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  41
  42 extern s8 physnode_map[];
  43
  44 static inline int pfn_to_nid(unsigned long pfn)
  45 {
  46 #ifdef CONFIG_NUMA
  47         return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
  48 #else
  49         return 0;
  50 #endif
  51 }
  52
  53 /*
  54  * Following are macros that each numa implmentation must define.
  55  */
  56
  57 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  58 #define node_end_pfn(nid)                                               \
  59 ({                                                                      \
  60         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  61         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  62 })
  63
  64 static inline int pfn_valid(int pfn)
  65 {
  66         int nid = pfn_to_nid(pfn);
  67
  68         if (nid >= 0)
  69                 return (pfn < node_end_pfn(nid));
  70         return 0;
  71 }
  72
  73 #endif /* CONFIG_DISCONTIGMEM */
  74
  75 #ifdef CONFIG_NEED_MULTIPLE_NODES
  76 /* always use node 0 for bootmem on this numa platform */
  77 #define bootmem_arch_preferred_node(__bdata, size, align, goal, limit)  \
  78         (NODE_DATA(0)->bdata)
  79 #endif /* CONFIG_NEED_MULTIPLE_NODES */
  80
  81 #endif /* _ASM_X86_MMZONE_32_H */