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
   8 extern int npmem_ranges;
   9
  10 struct node_map_data {
  11     pg_data_t pg_data;
  12 };
  13
  14 extern 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 */
  30 extern unsigned 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
  39 static 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 (int)pfnnid_map[i];
  50 }
  51
  52 static 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 */