LXR linux/arch/parisc/include/asm/mmzone.h

   1#ifndef _PARISC_MMZONE_H
   2#define _PARISC_MMZONE_H
   3
   4#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
   5
   6#ifdef CONFIG_DISCONTIGMEM
   7
   8extern int npmem_ranges;
   9
  10struct node_map_data {
  11    pg_data_t pg_data;
  12};
  13
  14extern struct node_map_data node_data[];
  15
  16#define NODE_DATA(nid)          (&node_data[nid].pg_data)
  17
  18/* We have these possible memory map layouts:
  19 * Astro: 0-3.75, 67.75-68, 4-64
  20 * zx1: 0-1, 257-260, 4-256
  21 * Stretch (N-class): 0-2, 4-32, 34-xxx
  22 */
  23
  24/* Since each 1GB can only belong to one region (node), we can create
  25 * an index table for pfn to nid lookup; each entry in pfnnid_map 
  26 * represents 1GB, and contains the node that the memory belongs to. */
  27
  28#define PFNNID_SHIFT (30 - PAGE_SHIFT)
  29#define PFNNID_MAP_MAX  512     /* support 512GB */
  30extern signed char pfnnid_map[PFNNID_MAP_MAX];
  31
  32#ifndef CONFIG_64BIT
  33#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  34#else
  35/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  36#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  37#endif
  38
  39static inline int pfn_to_nid(unsigned long pfn)
  40{
  41        unsigned int i;
  42
  43        if (unlikely(pfn_is_io(pfn)))
  44                return 0;
  45
  46        i = pfn >> PFNNID_SHIFT;
  47        BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
  48
  49        return pfnnid_map[i];
  50}
  51
  52static inline int pfn_valid(int pfn)
  53{
  54        int nid = pfn_to_nid(pfn);
  55
  56        if (nid >= 0)
  57                return (pfn < node_end_pfn(nid));
  58        return 0;
  59}
  60
  61#endif
  62#endif /* _PARISC_MMZONE_H */
  63