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 /* Should really switch to dynamic allocation at some point */
  15 #define NODEMAPSIZE 0x4fff
  16
  17 /* Simple perfect hash to map physical addresses to node numbers */
  18 struct memnode {
  19         int shift;
  20         u8 map[NODEMAPSIZE];
  21 } ____cacheline_aligned;
  22 extern struct memnode memnode;
  23 #define memnode_shift memnode.shift
  24 #define memnodemap memnode.map
  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((addr >> memnode_shift) >= NODEMAPSIZE);
  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
  43 #ifdef CONFIG_DISCONTIGMEM
  44 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  45
  46 extern int pfn_valid(unsigned long pfn);
  47 #endif
  48
  49 #endif
  50 #endif