LXR linux/arch/x86/kernel/genapic

   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
  25extern struct genapic apic_flat;
  26extern struct genapic apic_physflat;
  27extern struct genapic apic_x2xpic_uv_x;
  28extern struct genapic apic_x2apic_phys;
  29extern struct genapic apic_x2apic_cluster;
  30
  31struct genapic __read_mostly *genapic = &apic_flat;
  32
  33static 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 */
  44void __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
  60void apic_send_IPI_self(int vector)
  61{
  62        __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
  63}
  64
  65int __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}
  79