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 static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
  27 {
  28         return hard_smp_processor_id() >> index_msb;
  29 }
  30
  31 /*
  32  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  33  */
  34 void __init default_setup_apic_routing(void)
  35 {
  36         struct apic **drv;
  37
  38         enable_IR_x2apic();
  39
  40         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
  41                 if ((*drv)->probe && (*drv)->probe()) {
  42                         if (apic != *drv) {
  43                                 apic = *drv;
  44                                 pr_info("Switched APIC routing to %s.\n",
  45                                         apic->name);
  46                         }
  47                         break;
  48                 }
  49         }
  50
  51         if (is_vsmp_box()) {
  52                 /* need to update phys_pkg_id */
  53                 apic->phys_pkg_id = apicid_phys_pkg_id;
  54         }
  55 }
  56
  57 /* Same for both flat and physical. */
  58
  59 void apic_send_IPI_self(int vector)
  60 {
  61         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  62 }
  63
  64 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  65 {
  66         struct apic **drv;
  67
  68         for (drv = __apicdrivers; drv < __apicdrivers_end; drv++) {
  69                 if ((*drv)->acpi_madt_oem_check(oem_id, oem_table_id)) {
  70                         if (apic != *drv) {
  71                                 apic = *drv;
  72                                 pr_info("Setting APIC routing to %s.\n",
  73                                         apic->name);
  74                         }
  75                         return 1;
  76                 }
  77         }
  78         return 0;
  79 }