2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
5 * Generic APIC sub-arch probe layer.
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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>
23 #include <acpi/acpi_bus.h>
26 /* which logical CPU number maps to which CPU (physical APIC ID) */
27 u8 x86_cpu_to_apicid[NR_CPUS] __read_mostly
28 = { [0 ... NR_CPUS-1] = BAD_APICID };
29 EXPORT_SYMBOL(x86_cpu_to_apicid);
31 u8 x86_cpu_to_log_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
33 struct genapic __read_mostly *genapic = &apic_flat;
36 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
38 void __init clustered_apic_check(void)
40 unsigned int i, max_apic = 0;
45 * Quirk: some x86_64 machines can only use physical APIC mode
46 * regardless of how many processors are present (x86_64 ES7000
49 if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
50 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
51 genapic = &apic_physflat;
54 for (i = 0; i < NR_CPUS; i++) {
55 id = bios_cpu_apicid[i];
65 genapic = &apic_physflat;
67 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
70 /* Same for both flat and physical. */
72 void send_IPI_self(int vector)
74 __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);