arch/x86/kernel/genapic_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/ipi.h>
  23 #include <asm/genapic.h>
  24
  25 extern struct genapic apic_flat;
  26 extern struct genapic apic_physflat;
  27 extern struct genapic apic_x2xpic_uv_x;
  28 extern struct genapic apic_x2apic_phys;
  29 extern struct genapic apic_x2apic_cluster;
  30
  31 struct genapic __read_mostly *genapic = &apic_flat;
  32
  33 static struct genapic *apic_probe[] __initdata = {
  34         &apic_x2apic_uv_x,
  35         &apic_x2apic_phys,
  36         &apic_x2apic_cluster,
  37         &apic_physflat,
  38         NULL,
  39 };
  40
  41 /*
  42  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  43  */
  44 void __init setup_apic_routing(void)
  45 {
  46         if (genapic == &apic_x2apic_phys || genapic == &apic_x2apic_cluster) {
  47                 if (!intr_remapping_enabled)
  48                         genapic = &apic_flat;
  49         }
  50
  51         if (genapic == &apic_flat) {
  52                 if (max_physical_apicid >= 8)
  53                         genapic = &apic_physflat;
  54                 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
  55         }
  56 }
  57
  58 /* Same for both flat and physical. */
  59
  60 void apic_send_IPI_self(int vector)
  61 {
  62         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  63 }
  64
  65 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  66 {
  67         int i;
  68
  69         for (i = 0; apic_probe[i]; ++i) {
  70                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
  71                         genapic = apic_probe[i];
  72                         printk(KERN_INFO "Setting APIC routing to %s.\n",
  73                                 genapic->name);
  74                         return 1;
  75                 }
  76         }
  77         return 0;
  78 }