LXR linux/arch/x86/kernel/apic/probe

   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 */
  19void __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
  37int __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