LXR linux-old/include/asm-ia64/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
  12
  13#ifndef _ASM_IA64_NODEDATA_H
  14#define _ASM_IA64_NODEDATA_H
  15
  16
  17#include <asm/mmzone.h>
  18
  19/*
  20 * Node Data. One of these structures is located on each node of a NUMA system.
  21 */
  22
  23struct pglist_data;
  24struct ia64_node_data {
  25        short                   node;
  26        short                   active_cpu_count;
  27        /*
  28         * The fields are read-only (after boot). They contain pointers to various structures
  29         * located on other nodes. Ths data is replicated on each node in order to reduce
  30         * off-node references.
  31         */
  32        struct pglist_data      *pg_data_ptrs[NR_NODES];
  33        struct ia64_node_data   *node_data_ptrs[NR_NODES];
  34};
  35
  36
  37/*
  38 * Return a pointer to the node_data structure for the executing cpu.
  39 */
  40#define local_node_data         (local_cpu_data->node_data)
  41
  42
  43/*
  44 * Return a pointer to the node_data structure for the specified node.
  45 */
  46#define node_data(node) (local_node_data->node_data_ptrs[node])
  47
  48
  49/*
  50 * Given a node id, return a pointer to the pg_data_t for the node.
  51 * The following 2 macros are similar. 
  52 *
  53 * NODE_DATA    - should be used in all code not related to system
  54 *                initialization. It uses pernode data structures to minimize
  55 *                offnode memory references. However, these structure are not 
  56 *                present during boot. This macro can be used once cpu_init
  57 *                completes.
  58 *
  59 * NOTE:   The names of these macros are misleading but are difficult to change
  60 *         since they are used in generic linux & on other architecures.
  61 */
  62#define NODE_DATA(nid)          (local_node_data->pg_data_ptrs[nid])
  63
  64extern struct pglist_data * __init boot_get_pg_data_ptr(long);
  65
  66#endif /* _ASM_IA64_NODEDATA_H */
  67