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/*
* mce.c - x86 Machine Check Exception Reporting
* (c) 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>, Dave Jones <davej@redhat.com>
*/
#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;
int nr_mce_banks;
EXPORT_SYMBOL_GPL(nr_mce_banks); /* non-fatal.o */
/* Handle unconfigured int18 (should never happen) */
static 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 (*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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