include/asm-x86_64/mmzone.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_64_MMZONE_H
   5 #define _ASM_X86_64_MMZONE_H 1
   6
   7
   8 #ifdef CONFIG_NUMA
   9
  10 #define VIRTUAL_BUG_ON(x)
  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         u8 *map;
  19         u8 embedded_map[64-16];
  20 } ____cacheline_aligned; /* total size = 64 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         VIRTUAL_BUG_ON((addr >> memnode_shift) >= memnodemapsize);
  33         nid = memnodemap[addr >> memnode_shift];
  34         VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]);
  35         return nid;
  36 }
  37
  38 #define NODE_DATA(nid)          (node_data[nid])
  39
  40 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  41 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn + \
  42                                  NODE_DATA(nid)->node_spanned_pages)
  43
  44 #ifdef CONFIG_DISCONTIGMEM
  45 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  46
  47 extern int pfn_valid(unsigned long pfn);
  48 #endif
  49
  50 #ifdef CONFIG_NUMA_EMU
  51 #define FAKE_NODE_MIN_SIZE      (64*1024*1024)
  52 #define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1uL))
  53 #endif
  54
  55 #endif
  56 #endif