1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2004 James Cleverdon, IBM.
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/thread_info.h>
12 #include <asm/apic.h>
13
14 #include "local.h"
15
16 /*
17 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
18 */
default_setup_apic_routing(void)19 void __init default_setup_apic_routing(void)
20 {
21 struct apic **drv;
22
23 enable_IR_x2apic();
24
25 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
26 if ((*drv)->probe && (*drv)->probe()) {
27 if (apic != *drv) {
28 apic = *drv;
29 pr_info("Switched APIC routing to %s.\n",
30 apic->name);
31 }
32 break;
33 }
34 }
35 }
36
default_acpi_madt_oem_check(char * oem_id,char * oem_table_id)37 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
38 {
39 struct apic **drv;
40
41 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
42 if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) {
43 if (apic != *drv) {
44 apic = *drv;
45 pr_info("Setting APIC routing to %s.\n",
46 apic->name);
47 }
48 return 1;
49 }
50 }
51 return 0;
52 }
53