nodedata.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2000 Silicon Graphics, Inc.  All rights reserved.
 * Copyright (c) 2002 NEC Corp.
 * Copyright (c) 2002 Erich Focht <[email protected]>
 * Copyright (c) 2002 Kimio Suganuma <[email protected]>
 */
#ifndef _ASM_IA64_NODEDATA_H
#define _ASM_IA64_NODEDATA_H

#include <linux/numa.h>

#include <asm/percpu.h>
#include <asm/mmzone.h>

#ifdef CONFIG_NUMA

/*
 * Node Data. One of these structures is located on each node of a NUMA system.
 */

struct pglist_data;
struct ia64_node_data {
    short           active_cpu_count;
    short           node;
    struct pglist_data  *pg_data_ptrs[MAX_NUMNODES];
};


/*
 * Return a pointer to the node_data structure for the executing cpu.
 */
#define local_node_data     (local_cpu_data->node_data)

/*
 * Given a node id, return a pointer to the pg_data_t for the node.
 *
 * NODE_DATA    - should be used in all code not related to system
 *        initialization. It uses pernode data structures to minimize
 *        offnode memory references. However, these structure are not 
 *        present during boot. This macro can be used once cpu_init
 *        completes.
 */
#define NODE_DATA(nid)      (local_node_data->pg_data_ptrs[nid])

/*
 * LOCAL_DATA_ADDR - This is to calculate the address of other node's
 *           "local_node_data" at hot-plug phase. The local_node_data
 *           is pointed by per_cpu_page. Kernel usually use it for
 *           just executing cpu. However, when new node is hot-added,
 *           the addresses of local data for other nodes are necessary
 *           to update all of them.
 */
#define LOCAL_DATA_ADDR(pgdat)              \
    ((struct ia64_node_data *)((u64)(pgdat) +   \
                   L1_CACHE_ALIGN(sizeof(struct pglist_data))))

#endif /* CONFIG_NUMA */

#endif /* _ASM_IA64_NODEDATA_H */