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   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 #define node_localnr(pfn, nid)          ((pfn) - node_start_pfn(nid))
  29
  30 #define pfn_to_page(pfn)                                                \
  31 ({                                                                      \
  32         unsigned long __pfn = (pfn);                                    \
  33         int __node  = pfn_to_nid(__pfn);                                \
  34         &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)];   \
  35 })
  36
  37 #define page_to_pfn(pg)                                                 \
  38 ({                                                                      \
  39         struct page *__page = pg;                                       \
  40         struct zone *__zone = page_zone(__page);                        \
  41         BUG_ON(__zone == NULL);                                         \
  42         (unsigned long)(__page - __zone->zone_mem_map)                  \
  43                 + __zone->zone_start_pfn;                               \
  44 })
  45
  46 /* We have these possible memory map layouts:
  47  * Astro: 0-3.75, 67.75-68, 4-64
  48  * zx1: 0-1, 257-260, 4-256
  49  * Stretch (N-class): 0-2, 4-32, 34-xxx
  50  */
  51
  52 /* Since each 1GB can only belong to one region (node), we can create
  53  * an index table for pfn to nid lookup; each entry in pfnnid_map
  54  * represents 1GB, and contains the node that the memory belongs to. */
  55
  56 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  57 #define PFNNID_MAP_MAX  512     /* support 512GB */
  58 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  59
  60 #ifndef __LP64__
  61 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  62 #else
  63 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  64 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  65 #endif
  66
  67 static inline int pfn_to_nid(unsigned long pfn)
  68 {
  69         unsigned int i;
  70         unsigned char r;
  71
  72         if (unlikely(pfn_is_io(pfn)))
  73                 return 0;
  74
  75         i = pfn >> PFNNID_SHIFT;
  76         BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  77         r = pfnnid_map[i];
  78         BUG_ON(r == 0xff);
  79
  80         return (int)r;
  81 }
  82
  83 static inline int pfn_valid(int pfn)
  84 {
  85         int nid = pfn_to_nid(pfn);
  86
  87         if (nid >= 0)
  88                 return (pfn < node_end_pfn(nid));
  89         return 0;
  90 }
  91
  92 #else /* !CONFIG_DISCONTIGMEM */
  93 #define MAX_PHYSMEM_RANGES      1
  94 #endif
  95 #endif /* _PARISC_MMZONE_H */