release/src-rt-6.x.4708/linux/linux-2.6.36/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 extern struct apic apic_flat;
  27 extern struct apic apic_physflat;
  28 extern struct apic apic_x2xpic_uv_x;
  29 extern struct apic apic_x2apic_phys;
  30 extern struct apic apic_x2apic_cluster;
  31
  32 struct apic __read_mostly *apic = &apic_flat;
  33 EXPORT_SYMBOL_GPL(apic);
  34
  35 static struct apic *apic_probe[] __initdata = {
  36 #ifdef CONFIG_X86_UV
  37         &apic_x2apic_uv_x,
  38 #endif
  39 #ifdef CONFIG_X86_X2APIC
  40         &apic_x2apic_phys,
  41         &apic_x2apic_cluster,
  42 #endif
  43         &apic_physflat,
  44         NULL,
  45 };
  46
  47 static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
  48 {
  49         return hard_smp_processor_id() >> index_msb;
  50 }
  51
  52 /*
  53  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  54  */
  55 void __init default_setup_apic_routing(void)
  56 {
  57 #ifdef CONFIG_X86_X2APIC
  58         if (x2apic_mode
  59 #ifdef CONFIG_X86_UV
  60                        && apic != &apic_x2apic_uv_x
  61 #endif
  62                        ) {
  63                 if (x2apic_phys)
  64                         apic = &apic_x2apic_phys;
  65                 else
  66                         apic = &apic_x2apic_cluster;
  67         }
  68 #endif
  69
  70         if (apic == &apic_flat && num_possible_cpus() > 8)
  71                         apic = &apic_physflat;
  72
  73         printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
  74
  75         if (is_vsmp_box()) {
  76                 /* need to update phys_pkg_id */
  77                 apic->phys_pkg_id = apicid_phys_pkg_id;
  78         }
  79 }
  80
  81 /* Same for both flat and physical. */
  82
  83 void apic_send_IPI_self(int vector)
  84 {
  85         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  86 }
  87
  88 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  89 {
  90         int i;
  91
  92         for (i = 0; apic_probe[i]; ++i) {
  93                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
  94                         apic = apic_probe[i];
  95                         printk(KERN_INFO "Setting APIC routing to %s.\n",
  96                                 apic->name);
  97                         return 1;
  98                 }
  99         }
 100         return 0;
 101 }