blob: 4ae7b64402602d98eae00f1f85b2fda1ba847cd1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
4 *
5 * Generic APIC sub-arch probe layer.
6 *
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
9 * James Cleverdon.
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/threads.h>
12#include <linux/cpumask.h>
13#include <linux/string.h>
Ingo Molnar07c7c472007-05-02 19:27:04 +020014#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/kernel.h>
16#include <linux/ctype.h>
17#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19#include <asm/smp.h>
20#include <asm/ipi.h>
Jan Beulich00f1ea62007-05-02 19:27:04 +020021#include <asm/genapic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Ingo Molnar07c7c472007-05-02 19:27:04 +020023#ifdef CONFIG_ACPI
Jason Davis90660ec2005-04-16 15:24:53 -070024#include <acpi/acpi_bus.h>
25#endif
26
travis@sgi.com3b419082008-01-30 13:33:11 +010027/* which logical CPU number maps to which CPU (physical APIC ID) */
travis@sgi.comef970012008-01-30 13:33:10 +010028u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata
Ingo Molnar07c7c472007-05-02 19:27:04 +020029 = { [0 ... NR_CPUS-1] = BAD_APICID };
travis@sgi.com3b419082008-01-30 13:33:11 +010030void *x86_cpu_to_apicid_early_ptr;
travis@sgi.comef970012008-01-30 13:33:10 +010031DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
Mike Travis71fff5e2007-10-19 20:35:03 +020032EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Ingo Molnarf18d3972007-05-02 19:27:04 +020034struct genapic __read_mostly *genapic = &apic_flat;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36/*
37 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
38 */
Ingo Molnar3c43f032007-05-02 19:27:04 +020039void __init setup_apic_routing(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
Ingo Molnarf18d3972007-05-02 19:27:04 +020041#ifdef CONFIG_ACPI
Jason Davis90660ec2005-04-16 15:24:53 -070042 /*
Ingo Molnar07c7c472007-05-02 19:27:04 +020043 * Quirk: some x86_64 machines can only use physical APIC mode
44 * regardless of how many processors are present (x86_64 ES7000
45 * is an example).
Jason Davis90660ec2005-04-16 15:24:53 -070046 */
Ingo Molnar07c7c472007-05-02 19:27:04 +020047 if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
48 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
49 genapic = &apic_physflat;
Ingo Molnar3c43f032007-05-02 19:27:04 +020050 else
Jason Davis90660ec2005-04-16 15:24:53 -070051#endif
52
Ingo Molnar3c43f032007-05-02 19:27:04 +020053 if (cpus_weight(cpu_possible_map) <= 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 genapic = &apic_flat;
Ingo Molnarf18d3972007-05-02 19:27:04 +020055 else
Ingo Molnar07c7c472007-05-02 19:27:04 +020056 genapic = &apic_physflat;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
59}
60
Ingo Molnar07c7c472007-05-02 19:27:04 +020061/* Same for both flat and physical. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63void send_IPI_self(int vector)
64{
65 __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
66}