2 * mce.c - x86 Machine Check Exception Reporting
3 * (c) 2002 Alan Cox <alan@redhat.com>, Dave Jones <davej@redhat.com>
6 #include <linux/init.h>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/smp.h>
11 #include <linux/thread_info.h>
13 #include <asm/processor.h>
14 #include <asm/system.h>
22 EXPORT_SYMBOL_GPL(nr_mce_banks); /* non-fatal.o */
24 /* Handle unconfigured int18 (should never happen) */
25 static void unexpected_machine_check(struct pt_regs *regs, long error_code)
27 printk(KERN_ERR "CPU#%d: Unexpected int18 (Machine Check).\n", smp_processor_id());
30 /* Call the installed machine check handler for this CPU setup. */
31 void (*machine_check_vector)(struct pt_regs *, long error_code) = unexpected_machine_check;
33 /* This has to be run for each processor */
34 void mcheck_init(struct cpuinfo_x86 *c)
36 if (mce_disabled == 1)
39 switch (c->x86_vendor) {
44 case X86_VENDOR_INTEL:
46 intel_p5_mcheck_init(c);
48 intel_p6_mcheck_init(c);
50 intel_p4_mcheck_init(c);
53 case X86_VENDOR_CENTAUR:
55 winchip_mcheck_init(c);
63 static unsigned long old_cr4 __initdata;
65 void __init stop_mce(void)
68 clear_in_cr4(X86_CR4_MCE);
71 void __init restart_mce(void)
73 if (old_cr4 & X86_CR4_MCE)
74 set_in_cr4(X86_CR4_MCE);
77 static int __init mcheck_disable(char *str)
83 static int __init mcheck_enable(char *str)
89 __setup("nomce", mcheck_disable);
90 __setup("mce", mcheck_enable);