Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/threads.h> |
| 12 | #include <linux/cpumask.h> |
| 13 | #include <linux/string.h> |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 14 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/ctype.h> |
| 17 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <asm/smp.h> |
| 20 | #include <asm/ipi.h> |
Jan Beulich | 00f1ea6 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 21 | #include <asm/genapic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 23 | #ifdef CONFIG_ACPI |
Jason Davis | 90660ec | 2005-04-16 15:24:53 -0700 | [diff] [blame] | 24 | #include <acpi/acpi_bus.h> |
| 25 | #endif |
| 26 | |
travis@sgi.com | 3b41908 | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 27 | /* which logical CPU number maps to which CPU (physical APIC ID) */ |
travis@sgi.com | ef97001 | 2008-01-30 13:33:10 +0100 | [diff] [blame] | 28 | u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 29 | = { [0 ... NR_CPUS-1] = BAD_APICID }; |
travis@sgi.com | 3b41908 | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 30 | void *x86_cpu_to_apicid_early_ptr; |
travis@sgi.com | ef97001 | 2008-01-30 13:33:10 +0100 | [diff] [blame] | 31 | DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID; |
Mike Travis | 71fff5e | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 32 | EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Ingo Molnar | f18d397 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 34 | struct genapic __read_mostly *genapic = &apic_flat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. |
| 38 | */ |
Ingo Molnar | 3c43f03 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 39 | void __init setup_apic_routing(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
Ingo Molnar | f18d397 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 41 | #ifdef CONFIG_ACPI |
Jason Davis | 90660ec | 2005-04-16 15:24:53 -0700 | [diff] [blame] | 42 | /* |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 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). |
Jason Davis | 90660ec | 2005-04-16 15:24:53 -0700 | [diff] [blame] | 46 | */ |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 47 | if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID && |
| 48 | (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) |
| 49 | genapic = &apic_physflat; |
Ingo Molnar | 3c43f03 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 50 | else |
Jason Davis | 90660ec | 2005-04-16 15:24:53 -0700 | [diff] [blame] | 51 | #endif |
| 52 | |
Ingo Molnar | 3c43f03 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 53 | if (cpus_weight(cpu_possible_map) <= 8) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | genapic = &apic_flat; |
Ingo Molnar | f18d397 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 55 | else |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 56 | genapic = &apic_physflat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name); |
| 59 | } |
| 60 | |
Ingo Molnar | 07c7c47 | 2007-05-02 19:27:04 +0200 | [diff] [blame] | 61 | /* Same for both flat and physical. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | void send_IPI_self(int vector) |
| 64 | { |
| 65 | __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL); |
| 66 | } |