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_DISCONTIGMEM
  10
  11 #define VIRTUAL_BUG_ON(x)
  12
  13 #include <asm/smp.h>
  14
  15 #define NODEMAPSIZE 0xff
  16
  17 /* Simple perfect hash to map physical addresses to node numbers */
  18 extern int memnode_shift;
  19 extern u8  memnodemap[NODEMAPSIZE];
  20 extern int maxnode;
  21
  22 extern struct pglist_data *node_data[];
  23
  24 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
  25 {
  26         int nid;
  27         VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
  28         nid = memnodemap[addr >> memnode_shift];
  29         VIRTUAL_BUG_ON(nid > maxnode);
  30         return nid;
  31 }
  32
  33 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  34
  35 #define kvaddr_to_nid(kaddr)    phys_to_nid(__pa(kaddr))
  36 #define NODE_DATA(nid)          (node_data[nid])
  37
  38 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  39
  40 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  41 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  42 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn + \
  43                                  NODE_DATA(nid)->node_spanned_pages)
  44
  45 #define local_mapnr(kvaddr) \
  46         ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
  47
  48 /* AK: this currently doesn't deal with invalid addresses. We'll see
  49    if the 2.5 kernel doesn't pass them
  50    (2.4 used to). */
  51 #define pfn_to_page(pfn) ({ \
  52         int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT);    \
  53         ((pfn) - node_start_pfn(nid)) + node_mem_map(nid);              \
  54 })
  55
  56 #define page_to_pfn(page) \
  57         (long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
  58
  59 #define pfn_valid(pfn) ((pfn) >= num_physpages ? 0 : \
  60                         ({ u8 nid__ = pfn_to_nid(pfn); \
  61                            nid__ != 0xff && (pfn) >= node_start_pfn(nid__) && (pfn) <= node_end_pfn(nid__); }))
  62 #endif
  63 #endif