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/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  */
  28 void __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
  51 void apic_send_IPI_self(int vector)
  52 {
  53         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  54 }
  55
  56 int __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 }