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 #endif /* CONFIG_NUMA */
  15
  16 #ifdef CONFIG_DISCONTIGMEM
  17
  18 /*
  19  * generic node memory support, the following assumptions apply:
  20  *
  21  * 1) memory comes in 64Mb contiguous chunks which are either present or not
  22  * 2) we will not have more than 64Gb in total
  23  *
  24  * for now assume that 64Gb is max amount of RAM for whole system
  25  *    64Gb / 4096bytes/page = 16777216 pages
  26  */
  27 #define MAX_NR_PAGES 16777216
  28 #define MAX_SECTIONS 1024
  29 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
  30
  31 extern s8 physnode_map[];
  32
  33 static inline int pfn_to_nid(unsigned long pfn)
  34 {
  35 #ifdef CONFIG_NUMA
  36         return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
  37 #else
  38         return 0;
  39 #endif
  40 }
  41
  42 static inline int pfn_valid(int pfn)
  43 {
  44         int nid = pfn_to_nid(pfn);
  45
  46         if (nid >= 0)
  47                 return (pfn < node_end_pfn(nid));
  48         return 0;
  49 }
  50
  51 #define early_pfn_valid(pfn)    pfn_valid((pfn))
  52
  53 #endif /* CONFIG_DISCONTIGMEM */
  54
  55 #endif /* _ASM_X86_MMZONE_32_H */