2 * P5 specific Machine Check Exception Reporting
3 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
6 #include <linux/init.h>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
9 #include <linux/interrupt.h>
10 #include <linux/smp.h>
12 #include <asm/processor.h>
13 #include <asm/system.h>
18 /* Machine check handler for Pentium class Intel */
19 static void pentium_machine_check(struct pt_regs *regs, long error_code)
21 u32 loaddr, hi, lotype;
22 rdmsr(MSR_IA32_P5_MC_ADDR, loaddr, hi);
23 rdmsr(MSR_IA32_P5_MC_TYPE, lotype, hi);
24 printk(KERN_EMERG "CPU#%d: Machine Check Exception: 0x%8X (type 0x%8X).\n", smp_processor_id(), loaddr, lotype);
26 printk(KERN_EMERG "CPU#%d: Possible thermal failure (CPU on fire ?).\n", smp_processor_id());
27 add_taint(TAINT_MACHINE_CHECK);
30 /* Set up machine check reporting for processors with Intel style MCE */
31 void intel_p5_mcheck_init(struct cpuinfo_x86 *c)
35 /*Check for MCE support */
36 if (!cpu_has(c, X86_FEATURE_MCE))
39 /* Default P5 to off as its often misconnected */
40 if (mce_disabled != -1)
42 machine_check_vector = pentium_machine_check;
45 /* Read registers before enabling */
46 rdmsr(MSR_IA32_P5_MC_ADDR, l, h);
47 rdmsr(MSR_IA32_P5_MC_TYPE, l, h);
48 printk(KERN_INFO "Intel old style machine check architecture supported.\n");
51 set_in_cr4(X86_CR4_MCE);
52 printk(KERN_INFO "Intel old style machine check reporting enabled on CPU#%d.\n", smp_processor_id());