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 #define NODEMAPSIZE 0xfff
  16
  17 /* Simple perfect hash to map physical addresses to node numbers */
  18 extern int memnode_shift;
  19 extern u8  memnodemap[NODEMAPSIZE];
  20
  21 extern struct pglist_data *node_data[];
  22
  23 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
  24 {
  25         unsigned nid;
  26         VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
  27         nid = memnodemap[addr >> memnode_shift];
  28         VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]);
  29         return nid;
  30 }
  31
  32 #define NODE_DATA(nid)          (node_data[nid])
  33
  34 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  35 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn + \
  36                                  NODE_DATA(nid)->node_spanned_pages)
  37
  38 #ifdef CONFIG_DISCONTIGMEM
  39
  40 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  41 #define kvaddr_to_nid(kaddr)    phys_to_nid(__pa(kaddr))
  42
  43 /* Requires pfn_valid(pfn) to be true */
  44 #define pfn_to_page(pfn) ({ \
  45         int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT);    \
  46         ((pfn) - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map;   \
  47 })
  48
  49 #define page_to_pfn(page) \
  50         (long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
  51
  52 #define pfn_valid(pfn) ((pfn) >= num_physpages ? 0 : \
  53                         ({ u8 nid__ = pfn_to_nid(pfn); \
  54                            nid__ != 0xff && (pfn) >= node_start_pfn(nid__) && (pfn) < node_end_pfn(nid__); }))
  55 #endif
  56
  57 #define local_mapnr(kvaddr) \
  58         ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
  59 #endif
  60 #endif