arch/x86/kernel/apic/probe_64.c

   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  */
  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
  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 }