include/asm-m32r/mmzone.h

   1 /*
   2  * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
   3  *
   4  */
   5
   6 #ifndef _ASM_MMZONE_H_
   7 #define _ASM_MMZONE_H_
   8
   9 #include <asm/smp.h>
  10
  11 #ifdef CONFIG_DISCONTIGMEM
  12
  13 extern struct pglist_data *node_data[];
  14 #define NODE_DATA(nid)          (node_data[nid])
  15
  16 #define node_localnr(pfn, nid)  ((pfn) - NODE_DATA(nid)->node_start_pfn)
  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 - 1;      \
  22 })
  23
  24 #define pfn_to_page(pfn)                                                \
  25 ({                                                                      \
  26         unsigned long __pfn = pfn;                                      \
  27         int __node  = pfn_to_nid(__pfn);                                \
  28         &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)];   \
  29 })
  30
  31 #define page_to_pfn(pg)                                                 \
  32 ({                                                                      \
  33         struct page *__page = pg;                                       \
  34         struct zone *__zone = page_zone(__page);                        \
  35         (unsigned long)(__page - __zone->zone_mem_map)                  \
  36                 + __zone->zone_start_pfn;                               \
  37 })
  38 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
  39 /*
  40  * pfn_valid should be made as fast as possible, and the current definition
  41  * is valid for machines that are NUMA, but still contiguous, which is what
  42  * is currently supported. A more generalised, but slower definition would
  43  * be something like this - mbligh:
  44  * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
  45  */
  46 #if 1   /* M32R_FIXME */
  47 #define pfn_valid(pfn)  (1)
  48 #else
  49 #define pfn_valid(pfn)  ((pfn) < num_physpages)
  50 #endif
  51
  52 /*
  53  * generic node memory support, the following assumptions apply:
  54  */
  55
  56 static __inline__ int pfn_to_nid(unsigned long pfn)
  57 {
  58         int node;
  59
  60         for (node = 0 ; node < MAX_NUMNODES ; node++)
  61                 if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
  62                         break;
  63
  64         return node;
  65 }
  66
  67 static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
  68 {
  69         return(NODE_DATA(pfn_to_nid(pfn)));
  70 }
  71
  72 #endif /* CONFIG_DISCONTIGMEM */
  73 #endif /* _ASM_MMZONE_H_ */