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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:24 -0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:24 -0400
commit250c22777fe1ccd7ac588579a6c16db4c0161cc5 (patch)
tree55c317efb7d792ec6fdae1d1937c67a502c48dec /arch/x86/kernel/genapic_64.c
parent2db55d344e529492545cb3b755c7e9ba8e4fa94e (diff)
x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/genapic_64.c')
-rw-r--r--arch/x86/kernel/genapic_64.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
new file mode 100644
index 000000000000..47496a40e84f
--- /dev/null
+++ b/arch/x86/kernel/genapic_64.c
@@ -0,0 +1,66 @@
1/*
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 */
11#include <linux/threads.h>
12#include <linux/cpumask.h>
13#include <linux/string.h>
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/ctype.h>
17#include <linux/init.h>
18
19#include <asm/smp.h>
20#include <asm/ipi.h>
21#include <asm/genapic.h>
22
23#ifdef CONFIG_ACPI
24#include <acpi/acpi_bus.h>
25#endif
26
27/* which logical CPU number maps to which CPU (physical APIC ID) */
28u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly
29 = { [0 ... NR_CPUS-1] = BAD_APICID };
30EXPORT_SYMBOL(x86_cpu_to_apicid);
31
32u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
33
34struct genapic __read_mostly *genapic = &apic_flat;
35
36/*
37 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
38 */
39void __init setup_apic_routing(void)
40{
41#ifdef CONFIG_ACPI
42 /*
43 * 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).
46 */
47 if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
48 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
49 genapic = &apic_physflat;
50 else
51#endif
52
53 if (cpus_weight(cpu_possible_map) <= 8)
54 genapic = &apic_flat;
55 else
56 genapic = &apic_physflat;
57
58 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
59}
60
61/* Same for both flat and physical. */
62
63void send_IPI_self(int vector)
64{
65 __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
66}