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
  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
  34extern s8 physnode_map[];
  35
  36static 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
  45static 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 */
  59