LXR linux/arch/x86/include/asm/mmzone

   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
  12extern 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
  31extern s8 physnode_map[];
  32
  33static 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
  42static 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 */
  56