include/asm-parisc/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 /*
  18  * Given a kernel address, find the home node of the underlying memory.
  19  */
  20 #define kvaddr_to_nid(kaddr)    pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
  21
  22 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  23 #define node_end_pfn(nid)                                               \
  24 ({                                                                      \
  25         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  26         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  27 })
  28
  29 /* We have these possible memory map layouts:
  30  * Astro: 0-3.75, 67.75-68, 4-64
  31  * zx1: 0-1, 257-260, 4-256
  32  * Stretch (N-class): 0-2, 4-32, 34-xxx
  33  */
  34
  35 /* Since each 1GB can only belong to one region (node), we can create
  36  * an index table for pfn to nid lookup; each entry in pfnnid_map
  37  * represents 1GB, and contains the node that the memory belongs to. */
  38
  39 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  40 #define PFNNID_MAP_MAX  512     /* support 512GB */
  41 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  42
  43 #ifndef __LP64__
  44 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  45 #else
  46 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  47 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  48 #endif
  49
  50 static inline int pfn_to_nid(unsigned long pfn)
  51 {
  52         unsigned int i;
  53         unsigned char r;
  54
  55         if (unlikely(pfn_is_io(pfn)))
  56                 return 0;
  57
  58         i = pfn >> PFNNID_SHIFT;
  59         BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  60         r = pfnnid_map[i];
  61         BUG_ON(r == 0xff);
  62
  63         return (int)r;
  64 }
  65
  66 static inline int pfn_valid(int pfn)
  67 {
  68         int nid = pfn_to_nid(pfn);
  69
  70         if (nid >= 0)
  71                 return (pfn < node_end_pfn(nid));
  72         return 0;
  73 }
  74
  75 #else /* !CONFIG_DISCONTIGMEM */
  76 #define MAX_PHYSMEM_RANGES      1
  77 #endif
  78 #endif /* _PARISC_MMZONE_H */