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 #include <linux/config.h>
   8
   9 #ifdef CONFIG_NUMA
  10
  11 #define VIRTUAL_BUG_ON(x)
  12
  13 #include <asm/smp.h>
  14
  15 /* Should really switch to dynamic allocation at some point */
  16 #define NODEMAPSIZE 0x4fff
  17
  18 /* Simple perfect hash to map physical addresses to node numbers */
  19 struct memnode {
  20         int shift;
  21         u8 map[NODEMAPSIZE];
  22 } ____cacheline_aligned;
  23 extern struct memnode memnode;
  24 #define memnode_shift memnode.shift
  25 #define memnodemap memnode.map
  26
  27 extern struct pglist_data *node_data[];
  28
  29 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
  30 {
  31         unsigned nid;
  32         VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
  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 #define kvaddr_to_nid(kaddr)    phys_to_nid(__pa(kaddr))
  47
  48 extern int pfn_valid(unsigned long pfn);
  49 #endif
  50
  51 #endif
  52 #endif