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
;