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   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 #include <asm/setup.h>
  25
  26 extern struct genapic apic_flat;
  27 extern struct genapic apic_physflat;
  28 extern struct genapic apic_x2xpic_uv_x;
  29 extern struct genapic apic_x2apic_phys;
  30 extern struct genapic apic_x2apic_cluster;
  31
  32 struct genapic __read_mostly *genapic = &apic_flat;
  33
  34 static struct genapic *apic_probe[] __initdata = {
  35 #ifdef CONFIG_X86_UV
  36         &apic_x2apic_uv_x,
  37 #endif
  38         &apic_x2apic_phys,
  39         &apic_x2apic_cluster,
  40         &apic_physflat,
  41         NULL,
  42 };
  43
  44 /*
  45  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  46  */
  47 void __init setup_apic_routing(void)
  48 {
  49         if (genapic == &apic_x2apic_phys || genapic == &apic_x2apic_cluster) {
  50                 if (!intr_remapping_enabled)
  51                         genapic = &apic_flat;
  52         }
  53
  54         if (genapic == &apic_flat) {
  55                 if (max_physical_apicid >= 8)
  56                         genapic = &apic_physflat;
  57                 printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
  58         }
  59
  60         if (x86_quirks->update_genapic)
  61                 x86_quirks->update_genapic();
  62 }
  63
  64 /* Same for both flat and physical. */
  65
  66 void apic_send_IPI_self(int vector)
  67 {
  68         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  69 }
  70
  71 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  72 {
  73         int i;
  74
  75         for (i = 0; apic_probe[i]; ++i) {
  76                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
  77                         genapic = apic_probe[i];
  78                         printk(KERN_INFO "Setting APIC routing to %s.\n",
  79                                 genapic->name);
  80                         return 1;
  81                 }
  82         }
  83         return 0;
  84 }