release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/mmzone_64.h

   1 /* K8 NUMA support */
   2 /* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
   3 /* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
   4 #ifndef _ASM_X86_MMZONE_64_H
   5 #define _ASM_X86_MMZONE_64_H
   6
   7
   8 #ifdef CONFIG_NUMA
   9
  10 #include <linux/mmdebug.h>
  11
  12 #include <asm/smp.h>
  13
  14 /* Simple perfect hash to map physical addresses to node numbers */
  15 struct memnode {
  16         int shift;
  17         unsigned int mapsize;
  18         s16 *map;
  19         s16 embedded_map[64 - 8];
  20 } ____cacheline_aligned; /* total size = 128 bytes */
  21 extern struct memnode memnode;
  22 #define memnode_shift memnode.shift
  23 #define memnodemap memnode.map
  24 #define memnodemapsize memnode.mapsize
  25
  26 extern struct pglist_data *node_data[];
  27
  28 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
  29 {
  30         unsigned nid;
  31         VIRTUAL_BUG_ON(!memnodemap);
  32         nid = memnodemap[addr >> memnode_shift];
  33         VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]);
  34         return nid;
  35 }
  36
  37 #define NODE_DATA(nid)          (node_data[nid])
  38
  39 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  40 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn +       \
  41                                  NODE_DATA(nid)->node_spanned_pages)
  42 #endif
  43 #endif /* _ASM_X86_MMZONE_64_H */