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 #define node_localnr(pfn, nid)          ((pfn) - node_start_pfn(nid))
  29
  30 #define local_mapnr(kvaddr)                                             \
  31 ({                                                                      \
  32         unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
  33         (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
  34 })
  35
  36 #define pfn_to_page(pfn)                                                \
  37 ({                                                                      \
  38         unsigned long __pfn = (pfn);                                    \
  39         int __node  = pfn_to_nid(__pfn);                                \
  40         &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)];   \
  41 })
  42
  43 #define page_to_pfn(pg)                                                 \
  44 ({                                                                      \
  45         struct page *__page = pg;                                       \
  46         struct zone *__zone = page_zone(__page);                        \
  47         BUG_ON(__zone == NULL);                                         \
  48         (unsigned long)(__page - __zone->zone_mem_map)                  \
  49                 + __zone->zone_start_pfn;                               \
  50 })
  51
  52 /* We have these possible memory map layouts:
  53  * Astro: 0-3.75, 67.75-68, 4-64
  54  * zx1: 0-1, 257-260, 4-256
  55  * Stretch (N-class): 0-2, 4-32, 34-xxx
  56  */
  57
  58 /* Since each 1GB can only belong to one region (node), we can create
  59  * an index table for pfn to nid lookup; each entry in pfnnid_map
  60  * represents 1GB, and contains the node that the memory belongs to. */
  61
  62 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  63 #define PFNNID_MAP_MAX  512     /* support 512GB */
  64 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  65
  66 #ifndef __LP64__
  67 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  68 #else
  69 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  70 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  71 #endif
  72
  73 static inline int pfn_to_nid(unsigned long pfn)
  74 {
  75         unsigned int i;
  76         unsigned char r;
  77
  78         if (unlikely(pfn_is_io(pfn)))
  79                 return 0;
  80
  81         i = pfn >> PFNNID_SHIFT;
  82         BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  83         r = pfnnid_map[i];
  84         BUG_ON(r == 0xff);
  85
  86         return (int)r;
  87 }
  88
  89 static inline int pfn_valid(int pfn)
  90 {
  91         int nid = pfn_to_nid(pfn);
  92
  93         if (nid >= 0)
  94                 return (pfn < node_end_pfn(nid));
  95         return 0;
  96 }
  97
  98 #else /* !CONFIG_DISCONTIGMEM */
  99 #define MAX_PHYSMEM_RANGES      1
 100 #endif
 101 #endif /* _PARISC_MMZONE_H */