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mce_32.c

/*
 * mce.c - x86 Machine Check Exception Reporting
 * (c) 2002 Alan Cox <alan@redhat.com>, Dave Jones <davej@codemonkey.org.uk>
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/thread_info.h>

#include <asm/processor.h> 
#include <asm/system.h>
#include <asm/mce.h>

#include "mce.h"

int mce_disabled = 0;
int nr_mce_banks;

EXPORT_SYMBOL_GPL(nr_mce_banks);    /* non-fatal.o */

/* Handle unconfigured int18 (should never happen) */
static fastcall void unexpected_machine_check(struct pt_regs * regs, long error_code)
{     
      printk(KERN_ERR "CPU#%d: Unexpected int18 (Machine Check).\n", smp_processor_id());
}

/* Call the installed machine check handler for this CPU setup. */
void fastcall (*machine_check_vector)(struct pt_regs *, long error_code) = unexpected_machine_check;

/* This has to be run for each processor */
void mcheck_init(struct cpuinfo_x86 *c)
{
      if (mce_disabled==1)
            return;

      switch (c->x86_vendor) {
            case X86_VENDOR_AMD:
                  amd_mcheck_init(c);
                  break;

            case X86_VENDOR_INTEL:
                  if (c->x86==5)
                        intel_p5_mcheck_init(c);
                  if (c->x86==6)
                        intel_p6_mcheck_init(c);
                  if (c->x86==15)
                        intel_p4_mcheck_init(c);
                  break;

            case X86_VENDOR_CENTAUR:
                  if (c->x86==5)
                        winchip_mcheck_init(c);
                  break;

            default:
                  break;
      }
}

static unsigned long old_cr4 __initdata;

void __init stop_mce(void)
{
      old_cr4 = read_cr4();
      clear_in_cr4(X86_CR4_MCE);
}

void __init restart_mce(void)
{
      if (old_cr4 & X86_CR4_MCE)
            set_in_cr4(X86_CR4_MCE);
}

static int __init mcheck_disable(char *str)
{
      mce_disabled = 1;
      return 1;
}

static int __init mcheck_enable(char *str)
{
      mce_disabled = -1;
      return 1;
}

__setup("nomce", mcheck_disable);
__setup("mce", mcheck_enable);

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