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 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  18 #define node_end_pfn(nid)                                               \
  19 ({                                                                      \
  20         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  21         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  22 })
  23
  24 /* We have these possible memory map layouts:
  25  * Astro: 0-3.75, 67.75-68, 4-64
  26  * zx1: 0-1, 257-260, 4-256
  27  * Stretch (N-class): 0-2, 4-32, 34-xxx
  28  */
  29
  30 /* Since each 1GB can only belong to one region (node), we can create
  31  * an index table for pfn to nid lookup; each entry in pfnnid_map
  32  * represents 1GB, and contains the node that the memory belongs to. */
  33
  34 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  35 #define PFNNID_MAP_MAX  512     /* support 512GB */
  36 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  37
  38 #ifndef CONFIG_64BIT
  39 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  40 #else
  41 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  42 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  43 #endif
  44
  45 static inline int pfn_to_nid(unsigned long pfn)
  46 {
  47         unsigned int i;
  48         unsigned char r;
  49
  50         if (unlikely(pfn_is_io(pfn)))
  51                 return 0;
  52
  53         i = pfn >> PFNNID_SHIFT;
  54         BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  55         r = pfnnid_map[i];
  56         BUG_ON(r == 0xff);
  57
  58         return (int)r;
  59 }
  60
  61 static inline int pfn_valid(int pfn)
  62 {
  63         int nid = pfn_to_nid(pfn);
  64
  65         if (nid >= 0)
  66                 return (pfn < node_end_pfn(nid));
  67         return 0;
  68 }
  69
  70 #else /* !CONFIG_DISCONTIGMEM */
  71 #define MAX_PHYSMEM_RANGES      1
  72 #endif
  73 #endif /* _PARISC_MMZONE_H */