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_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  23 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  24 #define node_end_pfn(nid)                                               \
  25 ({                                                                      \
  26         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  27         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  28 })
  29 #define node_localnr(pfn, nid)          ((pfn) - node_start_pfn(nid))
  30
  31 #define local_mapnr(kvaddr)                                             \
  32 ({                                                                      \
  33         unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
  34         (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
  35 })
  36
  37 #define pfn_to_page(pfn)                                                \
  38 ({                                                                      \
  39         unsigned long __pfn = (pfn);                                    \
  40         int __node  = pfn_to_nid(__pfn);                                \
  41         &node_mem_map(__node)[node_localnr(__pfn,__node)];              \
  42 })
  43
  44 #define page_to_pfn(pg)                                                 \
  45 ({                                                                      \
  46         struct page *__page = pg;                                       \
  47         struct zone *__zone = page_zone(__page);                        \
  48         BUG_ON(__zone == NULL);                                         \
  49         (unsigned long)(__page - __zone->zone_mem_map)                  \
  50                 + __zone->zone_start_pfn;                               \
  51 })
  52
  53 /* We have these possible memory map layouts:
  54  * Astro: 0-3.75, 67.75-68, 4-64
  55  * zx1: 0-1, 257-260, 4-256
  56  * Stretch (N-class): 0-2, 4-32, 34-xxx
  57  */
  58
  59 /* Since each 1GB can only belong to one region (node), we can create
  60  * an index table for pfn to nid lookup; each entry in pfnnid_map
  61  * represents 1GB, and contains the node that the memory belongs to. */
  62
  63 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  64 #define PFNNID_MAP_MAX  512     /* support 512GB */
  65 extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  66
  67 #ifndef __LP64__
  68 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  69 #else
  70 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  71 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  72 #endif
  73
  74 static inline int pfn_to_nid(unsigned long pfn)
  75 {
  76         unsigned int i;
  77         unsigned char r;
  78
  79         if (unlikely(pfn_is_io(pfn)))
  80                 return 0;
  81
  82         i = pfn >> PFNNID_SHIFT;
  83         BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  84         r = pfnnid_map[i];
  85         BUG_ON(r == 0xff);
  86
  87         return (int)r;
  88 }
  89
  90 static inline int pfn_valid(int pfn)
  91 {
  92         int nid = pfn_to_nid(pfn);
  93
  94         if (nid >= 0)
  95                 return (pfn < node_end_pfn(nid));
  96         return 0;
  97 }
  98
  99 #else /* !CONFIG_DISCONTIGMEM */
 100 #define MAX_PHYSMEM_RANGES      1
 101 #endif
 102 #endif /* _PARISC_MMZONE_H */