release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/include/asm/nodedata.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 2000 Silicon Graphics, Inc.  All rights reserved.
   7  * Copyright (c) 2002 NEC Corp.
   8  * Copyright (c) 2002 Erich Focht <efocht@ess.nec.de>
   9  * Copyright (c) 2002 Kimio Suganuma <k-suganuma@da.jp.nec.com>
  10  */
  11 #ifndef _ASM_IA64_NODEDATA_H
  12 #define _ASM_IA64_NODEDATA_H
  13
  14 #include <linux/numa.h>
  15
  16 #include <asm/percpu.h>
  17 #include <asm/mmzone.h>
  18
  19 #ifdef CONFIG_NUMA
  20
  21 /*
  22  * Node Data. One of these structures is located on each node of a NUMA system.
  23  */
  24
  25 struct pglist_data;
  26 struct ia64_node_data {
  27         short                   active_cpu_count;
  28         short                   node;
  29         struct pglist_data      *pg_data_ptrs[MAX_NUMNODES];
  30 };
  31
  32
  33 /*
  34  * Return a pointer to the node_data structure for the executing cpu.
  35  */
  36 #define local_node_data         (local_cpu_data->node_data)
  37
  38 /*
  39  * Given a node id, return a pointer to the pg_data_t for the node.
  40  *
  41  * NODE_DATA    - should be used in all code not related to system
  42  *                initialization. It uses pernode data structures to minimize
  43  *                offnode memory references. However, these structure are not
  44  *                present during boot. This macro can be used once cpu_init
  45  *                completes.
  46  */
  47 #define NODE_DATA(nid)          (local_node_data->pg_data_ptrs[nid])
  48
  49 /*
  50  * LOCAL_DATA_ADDR - This is to calculate the address of other node's
  51  *                   "local_node_data" at hot-plug phase. The local_node_data
  52  *                   is pointed by per_cpu_page. Kernel usually use it for
  53  *                   just executing cpu. However, when new node is hot-added,
  54  *                   the addresses of local data for other nodes are necessary
  55  *                   to update all of them.
  56  */
  57 #define LOCAL_DATA_ADDR(pgdat)                          \
  58         ((struct ia64_node_data *)((u64)(pgdat) +       \
  59                                    L1_CACHE_ALIGN(sizeof(struct pglist_data))))
  60
  61 #endif /* CONFIG_NUMA */
  62
  63 #endif /* _ASM_IA64_NODEDATA_H */