kernel/arch/x86/kernel/apic/probe_64.c

   1 /*
   2  * Copyright 2004 James Cleverdon, IBM.
   3  * Subject to the GNU Public License, v.2
   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/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>
  20
  21 #include <asm/smp.h>
  22 #include <asm/apic.h>
  23 #include <asm/ipi.h>
  24 #include <asm/setup.h>
  25
  26 /*
  27  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  28  */
  29 void __init default_setup_apic_routing(void)
  30 {
  31         struct apic **drv;
  32
  33         enable_IR_x2apic();
  34
  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);
  41                         }
  42                         break;
  43                 }
  44         }
  45
  46         if (x86_platform.apic_post_init)
  47                 x86_platform.apic_post_init();
  48 }
  49
  50 /* Same for both flat and physical. */
  51
  52 void apic_send_IPI_self(int vector)
  53 {
  54         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  55 }
  56
  57 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  58 {
  59         struct apic **drv;
  60
  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);
  67                         }
  68                         return 1;
  69                 }
  70         }
  71         return 0;
  72 }