Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Copyright 2004 James Cleverdon, IBM.

 * Subject to the GNU Public License, v.2

 *

 * Generic APIC sub-arch probe layer.

 *

 * Hacked for x86-64 by James Cleverdon from i386 architecture code by

 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and

 * James Cleverdon.

 */

#include <linux/threads.h>

#include <linux/cpumask.h>

#include <linux/string.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/ctype.h>

#include <linux/init.h>

#include <asm/smp.h>

#include <asm/ipi.h>

#include <asm/genapic.h>

#ifdef CONFIG_ACPI

#include <acpi/acpi_bus.h>

#endif

/*

 * which logical CPU number maps to which CPU (physical APIC ID)

 *

 * The following static array is used during kernel startup

 * and the x86_cpu_to_apicid_ptr contains the address of the

 * array during this time.  Is it zeroed when the per_cpu

 * data area is removed.

 */

u8 x86_cpu_to_apicid_init[NR_CPUS] __initdata

                                        = { [0 ... NR_CPUS-1] = BAD_APICID };

void *x86_cpu_to_apicid_ptr;

DEFINE_PER_CPU(u8, x86_cpu_to_apicid) = BAD_APICID;

EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);

struct genapic __read_mostly *genapic = &apic_flat;

/*

 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.

 */

void __init setup_apic_routing(void)

{

#ifdef CONFIG_ACPI

        /*

         * Quirk: some x86_64 machines can only use physical APIC mode

         * regardless of how many processors are present (x86_64 ES7000

         * is an example).

         */

        if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&

                        (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))

                genapic = &apic_physflat;

        else

#endif

        if (cpus_weight(cpu_possible_map) <= 8)

                genapic = &apic_flat;

        else

                genapic = &apic_physflat;

        printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);

}

/* Same for both flat and physical. */

void send_IPI_self(int vector)

{

        __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);

}