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 */
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>
20
21 #include <asm/smp.h>
22 #include <asm/ipi.h>
23 #include <asm/genapic.h>
24 #include <asm/setup.h>
25
26 extern struct genapic apic_flat;
27 extern struct genapic apic_physflat;
28 extern struct genapic apic_x2xpic_uv_x;
29 extern struct genapic apic_x2apic_phys;
30 extern struct genapic apic_x2apic_cluster;
31
32 struct genapic __read_mostly *genapic = &apic_flat;
33
34 static struct genapic *apic_probe[] __initdata = {
35 &apic_x2apic_uv_x,
36 &apic_x2apic_phys,
37 &apic_x2apic_cluster,
38 &apic_physflat,
39 NULL,
40 };
41
42 /*
43 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
44 */
setup_apic_routing(void)45 void __init setup_apic_routing(void)
46 {
47 if (genapic == &apic_x2apic_phys || genapic == &apic_x2apic_cluster) {
48 if (!intr_remapping_enabled)
49 genapic = &apic_flat;
50 }
51
52 if (genapic == &apic_flat) {
53 if (max_physical_apicid >= 8)
54 genapic = &apic_physflat;
55 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
56 }
57
58 if (x86_quirks->update_genapic)
59 x86_quirks->update_genapic();
60 }
61
62 /* Same for both flat and physical. */
63
apic_send_IPI_self(int vector)64 void apic_send_IPI_self(int vector)
65 {
66 __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
67 }
68
acpi_madt_oem_check(char * oem_id,char * oem_table_id)69 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
70 {
71 int i;
72
73 for (i = 0; apic_probe[i]; ++i) {
74 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
75 genapic = apic_probe[i];
76 printk(KERN_INFO "Setting APIC routing to %s.\n",
77 genapic->name);
78 return 1;
79 }
80 }
81 return 0;
82 }
83