ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / arch / x86 / kernel / apic / probe_64.c
blob1793dba7a741bcf22271b71848fa92293bddde70
1 /*
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
9 * James Cleverdon.
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>
21 #include <asm/smp.h>
22 #include <asm/apic.h>
23 #include <asm/ipi.h>
24 #include <asm/setup.h>
27 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
29 void __init default_setup_apic_routing(void)
31 struct apic **drv;
33 enable_IR_x2apic();
35 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
36 if ((*drv)->probe && (*drv)->probe()) {
37 if (apic != *drv) {
38 apic = *drv;
39 pr_info("Switched APIC routing to %s.\n",
40 apic->name);
42 break;
46 if (x86_platform.apic_post_init)
47 x86_platform.apic_post_init();
50 /* Same for both flat and physical. */
52 void apic_send_IPI_self(int vector)
54 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
57 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
59 struct apic **drv;
61 for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
62 if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) {
63 if (apic != *drv) {
64 apic = *drv;
65 pr_info("Setting APIC routing to %s.\n",
66 apic->name);
68 return 1;
71 return 0;