1. 根目录:
2. arch
3. x86
4. include
5. asm
6. topology.h

/*
 * Written by: Matthew Dobson, IBM Corporation
 *
 * Copyright (C) 2002, IBM Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <colpatch@us.ibm.com>
 */
#ifndef _ASM_X86_TOPOLOGY_H
#define _ASM_X86_TOPOLOGY_H

#ifdef CONFIG_X86_32
# ifdef CONFIG_X86_HT
#  define ENABLE_TOPO_DEFINES
# endif
#else
# ifdef CONFIG_SMP
#  define ENABLE_TOPO_DEFINES
# endif
#endif

/*
 * to preserve the visibility of NUMA_NO_NODE definition,
 * moved to there from here.  May be used independent of
 * CONFIG_NUMA.
 */
#include <linux/numa.h>

#ifdef CONFIG_NUMA
#include <linux/cpumask.h>

#include <asm/mpspec.h>

/* Mappings between logical cpu number and node number */
DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);

#ifdef CONFIG_DEBUG_PER_CPU_MAPS
/*
 * override generic percpu implementation of cpu_to_node
 */
extern int __cpu_to_node(int cpu);
#define cpu_to_node __cpu_to_node

extern int early_cpu_to_node(int cpu);

#else	/* !CONFIG_DEBUG_PER_CPU_MAPS */

/* Same function but used if called before per_cpu areas are setup */
static inline int early_cpu_to_node(int cpu)
{
	return early_per_cpu(x86_cpu_to_node_map, cpu);
}

#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */

/* Mappings between node number and cpus on that node. */
extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];

#ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern const struct cpumask *cpumask_of_node(int node);
#else
/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
static inline const struct cpumask *cpumask_of_node(int node)
{
	return node_to_cpumask_map[node];
}
#endif

extern void setup_node_to_cpumask_map(void);

/*
 * Returns the number of the node containing Node 'node'. This
 * architecture is flat, so it is a pretty simple function!
 */
#define parent_node(node) (node)

#define pcibus_to_node(bus) __pcibus_to_node(bus)

extern int __node_distance(int, int);
#define node_distance(a, b) __node_distance(a, b)

#else /* !CONFIG_NUMA */

static inline int numa_node_id(void)
{
	return 0;
}
/*
 * indicate override:
 */
#define numa_node_id numa_node_id

static inline int early_cpu_to_node(int cpu)
{
	return 0;
}

static inline void setup_node_to_cpumask_map(void) { }

#endif

#include <asm-generic/topology.h>

extern const struct cpumask *cpu_coregroup_mask(int cpu);

#ifdef ENABLE_TOPO_DEFINES
#define topology_physical_package_id(cpu)	(cpu_data(cpu).phys_proc_id)
#define topology_core_id(cpu)			(cpu_data(cpu).cpu_core_id)
#define topology_core_cpumask(cpu)		(per_cpu(cpu_core_map, cpu))
#define topology_thread_cpumask(cpu)		(per_cpu(cpu_sibling_map, cpu))

/* indicates that pointers to the topology cpumask_t maps are valid */
#define arch_provides_topology_pointers		yes
#endif

static inline void arch_fix_phys_package_id(int num, u32 slot)
{
}

struct pci_bus;
void x86_pci_root_bus_resources(int bus, struct list_head *resources);

#ifdef CONFIG_SMP
#define mc_capable()	((boot_cpu_data.x86_max_cores > 1) && \
			(cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids))
#define smt_capable()			(smp_num_siblings > 1)
#endif

#ifdef CONFIG_NUMA
extern int get_mp_bus_to_node(int busnum);
extern void set_mp_bus_to_node(int busnum, int node);
#else
static inline int get_mp_bus_to_node(int busnum)
{
	return 0;
}
static inline void set_mp_bus_to_node(int busnum, int node)
{
}
#endif

#endif /* _ASM_X86_TOPOLOGY_H */