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/threads.h>
  12#include <linux/cpumask.h>
  13#include <linux/string.h>
  14#include <linux/init.h>
  15#include <linux/kernel.h>
  16#include <linux/ctype.h>
  17#include <linux/hardirq.h>
  18#include <linux/dmar.h>
  19
  20#include <asm/smp.h>
  21#include <asm/apic.h>
  22#include <asm/ipi.h>
  23#include <asm/setup.h>
  24
  25/*
  26 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  27 */
  28void __init default_setup_apic_routing(void)
  29{
  30        struct apic **drv;
  31
  32        enable_IR_x2apic();
  33
  34        for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
  35                if ((*drv)->probe && (*drv)->probe()) {
  36                        if (apic != *drv) {
  37                                apic = *drv;
  38                                pr_info("Switched APIC routing to %s.\n",
  39                                        apic->name);
  40                        }
  41                        break;
  42                }
  43        }
  44
  45        if (x86_platform.apic_post_init)
  46                x86_platform.apic_post_init();
  47}
  48
  49/* Same for both flat and physical. */
  50
  51void apic_send_IPI_self(int vector)
  52{
  53        __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  54}
  55
  56int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  57{
  58        struct apic **drv;
  59
  60        for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
  61                if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) {
  62                        if (apic != *drv) {
  63                                apic = *drv;
  64                                pr_info("Setting APIC routing to %s.\n",
  65                                        apic->name);
  66                        }
  67                        return 1;
  68                }
  69        }
  70        return 0;
  71}
  72