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>
18 #include <linux/hardirq.h>
19 #include <linux/dmar.h>
23 #include <asm/genapic.h>
26 #include <acpi/acpi_bus.h>
29 DEFINE_PER_CPU(int, x2apic_extra_bits);
31 struct genapic __read_mostly *genapic = &apic_flat;
33 static enum uv_system_type uv_system_type;
36 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
38 void __init setup_apic_routing(void)
40 if (uv_system_type == UV_NON_UNIQUE_APIC)
41 genapic = &apic_x2apic_uv_x;
42 else if (cpu_has_x2apic && intr_remapping_enabled)
43 genapic = &apic_x2apic_cluster;
47 * Quirk: some x86_64 machines can only use physical APIC mode
48 * regardless of how many processors are present (x86_64 ES7000
51 if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
52 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
53 genapic = &apic_physflat;
57 if (max_physical_apicid < 8)
60 genapic = &apic_physflat;
62 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
65 /* Same for both flat and physical. */
67 void apic_send_IPI_self(int vector)
69 __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
72 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
74 if (!strcmp(oem_id, "SGI")) {
75 if (!strcmp(oem_table_id, "UVL"))
76 uv_system_type = UV_LEGACY_APIC;
77 else if (!strcmp(oem_table_id, "UVX"))
78 uv_system_type = UV_X2APIC;
79 else if (!strcmp(oem_table_id, "UVH"))
80 uv_system_type = UV_NON_UNIQUE_APIC;
85 enum uv_system_type get_uv_system_type(void)
87 return uv_system_type;
90 int is_uv_system(void)
92 return uv_system_type != UV_NONE;