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) */
   7 extern int npmem_ranges;
   8
   9 struct node_map_data {
  10     pg_data_t pg_data;
  11 };
  12
  13 extern 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 */
  29 extern 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
  38 static 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
  54 static 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 */