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 MAXNODE 8
  16 #define NODEMAPSIZE 0xff
  17
  18 /* Simple perfect hash to map physical addresses to node numbers */
  19 extern int memnode_shift;
  20 extern u8  memnodemap[NODEMAPSIZE];
  21 extern int maxnode;
  22
  23 extern struct pglist_data *node_data[];
  24
  25 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
  26 {
  27         int nid;
  28         VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
  29         nid = memnodemap[addr >> memnode_shift];
  30         VIRTUAL_BUG_ON(nid > maxnode);
  31         return nid;
  32 }
  33
  34 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
  35
  36 #define kvaddr_to_nid(kaddr)    phys_to_nid(__pa(kaddr))
  37 #define NODE_DATA(nid)          (node_data[nid])
  38
  39 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  40
  41 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  42 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  43 #define node_end_pfn(nid)       (NODE_DATA(nid)->node_start_pfn + \
  44                                  NODE_DATA(nid)->node_spanned_pages)
  45
  46 #define local_mapnr(kvaddr) \
  47         ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
  48
  49 /* AK: this currently doesn't deal with invalid addresses. We'll see
  50    if the 2.5 kernel doesn't pass them
  51    (2.4 used to). */
  52 #define pfn_to_page(pfn) ({ \
  53         int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT);    \
  54         ((pfn) - node_start_pfn(nid)) + node_mem_map(nid);              \
  55 })
  56
  57 #define page_to_pfn(page) \
  58         (long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
  59
  60 /* AK: !DISCONTIGMEM just forces it to 1. Can't we too? */
  61 #define pfn_valid(pfn)          ((pfn) < num_physpages)
  62
  63
  64 #endif
  65 #endif