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 #endif /* CONFIG_NUMA */
  18
  19 #ifdef CONFIG_DISCONTIGMEM
  20
  21 /*
  22  * generic node memory support, the following assumptions apply:
  23  *
  24  * 1) memory comes in 64Mb contiguous chunks which are either present or not
  25  * 2) we will not have more than 64Gb in total
  26  *
  27  * for now assume that 64Gb is max amount of RAM for whole system
  28  *    64Gb / 4096bytes/page = 16777216 pages
  29  */
  30 #define MAX_NR_PAGES 16777216
  31 #define MAX_SECTIONS 1024
  32 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
  33
  34 extern s8 physnode_map[];
  35
  36 static inline int pfn_to_nid(unsigned long pfn)
  37 {
  38 #ifdef CONFIG_NUMA
  39         return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
  40 #else
  41         return 0;
  42 #endif
  43 }
  44
  45 static inline int pfn_valid(int pfn)
  46 {
  47         int nid = pfn_to_nid(pfn);
  48
  49         if (nid >= 0)
  50                 return (pfn < node_end_pfn(nid));
  51         return 0;
  52 }
  53
  54 #define early_pfn_valid(pfn)    pfn_valid((pfn))
  55
  56 #endif /* CONFIG_DISCONTIGMEM */
  57
  58 #endif /* _ASM_X86_MMZONE_32_H */