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probe.c

/* Copyright 2003 Andi Kleen, SuSE Labs. 
 * Subject to the GNU Public License, v.2 
 * 
 * Generic x86 APIC driver probe layer.
 */  
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
#include <asm/genapic.h>

extern struct genapic apic_summit;
extern struct genapic apic_bigsmp;
extern struct genapic apic_es7000;
extern struct genapic apic_default;

struct genapic *genapic = &apic_default;

static struct genapic *apic_probe[] __initdata = {
      &apic_summit,
      &apic_bigsmp, 
      &apic_es7000,
      &apic_default,    /* must be last */
      NULL,
};

static int cmdline_apic __initdata;
static int __init parse_apic(char *arg)
{
      int i;

      if (!arg)
            return -EINVAL;

      for (i = 0; apic_probe[i]; i++) {
            if (!strcmp(apic_probe[i]->name, arg)) {
                  genapic = apic_probe[i];
                  cmdline_apic = 1;
                  return 0;
            }
      }

      /* Parsed again by __setup for debug/verbose */
      return 0;
}
early_param("apic", parse_apic);

void __init generic_bigsmp_probe(void)
{
      /*
       * This routine is used to switch to bigsmp mode when
       * - There is no apic= option specified by the user
       * - generic_apic_probe() has chosen apic_default as the sub_arch
       * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
       */

      if (!cmdline_apic && genapic == &apic_default)
            if (apic_bigsmp.probe()) {
                  genapic = &apic_bigsmp;
                  printk(KERN_INFO "Overriding APIC driver with %s\n",
                         genapic->name);
            }
}

void __init generic_apic_probe(void)
{ 
      if (!cmdline_apic) {
            int i;
            for (i = 0; apic_probe[i]; i++) {
                  if (apic_probe[i]->probe()) {
                        genapic = apic_probe[i];
                        break;
                  }
            }
            /* Not visible without early console */
            if (!apic_probe[i])
                  panic("Didn't find an APIC driver");
      }
      printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
} 

/* These functions can switch the APIC even after the initial ->probe() */

int __init mps_oem_check(struct mp_config_table *mpc, char *oem, char *productid)
{ 
      int i;
      for (i = 0; apic_probe[i]; ++i) { 
            if (apic_probe[i]->mps_oem_check(mpc,oem,productid)) { 
                  if (!cmdline_apic) {
                        genapic = apic_probe[i];
                        printk(KERN_INFO "Switched to APIC driver `%s'.\n",
                               genapic->name);
                  }
                  return 1;
            } 
      } 
      return 0;
} 

int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
      int i;
      for (i = 0; apic_probe[i]; ++i) { 
            if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { 
                  if (!cmdline_apic) {
                        genapic = apic_probe[i];
                        printk(KERN_INFO "Switched to APIC driver `%s'.\n",
                               genapic->name);
                  }
                  return 1;
            } 
      } 
      return 0;   
}

int hard_smp_processor_id(void)
{
      return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
}

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