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

   1#ifndef _PARISC_MMZONE_H
   2#define _PARISC_MMZONE_H
   3
   4#ifdef CONFIG_DISCONTIGMEM
   5
   6#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
   7extern int npmem_ranges;
   8
   9struct node_map_data {
  10    pg_data_t pg_data;
  11};
  12
  13extern struct node_map_data node_data[];
  14
  15#define NODE_DATA(nid)          (&node_data[nid].pg_data)
  16
  17/* We have these possible memory map layouts:
  18 * Astro: 0-3.75, 67.75-68, 4-64
  19 * zx1: 0-1, 257-260, 4-256
  20 * Stretch (N-class): 0-2, 4-32, 34-xxx
  21 */
  22
  23/* Since each 1GB can only belong to one region (node), we can create
  24 * an index table for pfn to nid lookup; each entry in pfnnid_map 
  25 * represents 1GB, and contains the node that the memory belongs to. */
  26
  27#define PFNNID_SHIFT (30 - PAGE_SHIFT)
  28#define PFNNID_MAP_MAX  512     /* support 512GB */
  29extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  30
  31#ifndef CONFIG_64BIT
  32#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  33#else
  34/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  35#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  36#endif
  37
  38static inline int pfn_to_nid(unsigned long pfn)
  39{
  40        unsigned int i;
  41        unsigned char r;
  42
  43        if (unlikely(pfn_is_io(pfn)))
  44                return 0;
  45
  46        i = pfn >> PFNNID_SHIFT;
  47        BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  48        r = pfnnid_map[i];
  49        BUG_ON(r == 0xff);
  50
  51        return (int)r;
  52}
  53
  54static inline int pfn_valid(int pfn)
  55{
  56        int nid = pfn_to_nid(pfn);
  57
  58        if (nid >= 0)
  59                return (pfn < node_end_pfn(nid));
  60        return 0;
  61}
  62
  63#else /* !CONFIG_DISCONTIGMEM */
  64#define MAX_PHYSMEM_RANGES      1 
  65#endif
  66#endif /* _PARISC_MMZONE_H */
  67