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_SECTIONS 1024
  38 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
  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_SECTION]);
  46 #else
  47         return 0;
  48 #endif
  49 }
  50
  51 static inline int pfn_valid(int pfn)
  52 {
  53         int nid = pfn_to_nid(pfn);
  54
  55         if (nid >= 0)
  56                 return (pfn < node_end_pfn(nid));
  57         return 0;
  58 }
  59
  60 #define early_pfn_valid(pfn)    pfn_valid((pfn))
  61
  62 #endif /* CONFIG_DISCONTIGMEM */
  63
  64 #endif /* _ASM_X86_MMZONE_32_H */