198a071dff
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
|
|
* 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) */
|
|
u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly
|
|
= { [0 ... NR_CPUS-1] = BAD_APICID };
|
|
EXPORT_SYMBOL(x86_cpu_to_apicid);
|
|
|
|
u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_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);
|
|
}
|