| /* |
| * 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 <linux/hardirq.h> |
| |
| #include <asm/smp.h> |
| #include <asm/ipi.h> |
| #include <asm/genapic.h> |
| |
| #ifdef CONFIG_ACPI |
| #include <acpi/acpi_bus.h> |
| #endif |
| |
| DEFINE_PER_CPU(int, x2apic_extra_bits); |
| |
| struct genapic __read_mostly *genapic = &apic_flat; |
| |
| static enum uv_system_type uv_system_type; |
| |
| /* |
| * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. |
| */ |
| void __init setup_apic_routing(void) |
| { |
| if (uv_system_type == UV_NON_UNIQUE_APIC) |
| genapic = &apic_x2apic_uv_x; |
| else |
| #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 (num_possible_cpus() <= 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); |
| } |
| |
| int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
| { |
| if (!strcmp(oem_id, "SGI")) { |
| if (!strcmp(oem_table_id, "UVL")) |
| uv_system_type = UV_LEGACY_APIC; |
| else if (!strcmp(oem_table_id, "UVX")) |
| uv_system_type = UV_X2APIC; |
| else if (!strcmp(oem_table_id, "UVH")) |
| uv_system_type = UV_NON_UNIQUE_APIC; |
| } |
| return 0; |
| } |
| |
| unsigned int read_apic_id(void) |
| { |
| unsigned int id; |
| |
| WARN_ON(preemptible()); |
| id = apic_read(APIC_ID); |
| if (uv_system_type >= UV_X2APIC) |
| id |= __get_cpu_var(x2apic_extra_bits); |
| return id; |
| } |
| |
| enum uv_system_type get_uv_system_type(void) |
| { |
| return uv_system_type; |
| } |
| |
| int is_uv_system(void) |
| { |
| return uv_system_type != UV_NONE; |
| } |