diff options
Diffstat (limited to 'arch/x86/kernel/cpu/mcheck/p5.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/p5.c | 51 |
1 files changed, 33 insertions, 18 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/p5.c b/arch/x86/kernel/cpu/mcheck/p5.c index c9f77ea69ed..5c0e6533d9b 100644 --- a/arch/x86/kernel/cpu/mcheck/p5.c +++ b/arch/x86/kernel/cpu/mcheck/p5.c @@ -2,52 +2,67 @@ * P5 specific Machine Check Exception Reporting * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk> */ - -#include <linux/init.h> -#include <linux/types.h> -#include <linux/kernel.h> #include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> #include <linux/smp.h> #include <asm/processor.h> #include <asm/system.h> +#include <asm/mce.h> #include <asm/msr.h> -#include "mce.h" +/* By default disabled */ +int mce_p5_enabled __read_mostly; -/* Machine check handler for Pentium class Intel */ +/* Machine check handler for Pentium class Intel CPUs: */ static void pentium_machine_check(struct pt_regs *regs, long error_code) { u32 loaddr, hi, lotype; + rdmsr(MSR_IA32_P5_MC_ADDR, loaddr, hi); rdmsr(MSR_IA32_P5_MC_TYPE, lotype, hi); - printk(KERN_EMERG "CPU#%d: Machine Check Exception: 0x%8X (type 0x%8X).\n", smp_processor_id(), loaddr, lotype); - if (lotype&(1<<5)) - printk(KERN_EMERG "CPU#%d: Possible thermal failure (CPU on fire ?).\n", smp_processor_id()); + + printk(KERN_EMERG + "CPU#%d: Machine Check Exception: 0x%8X (type 0x%8X).\n", + smp_processor_id(), loaddr, lotype); + + if (lotype & (1<<5)) { + printk(KERN_EMERG + "CPU#%d: Possible thermal failure (CPU on fire ?).\n", + smp_processor_id()); + } + add_taint(TAINT_MACHINE_CHECK); } -/* Set up machine check reporting for processors with Intel style MCE */ +/* Set up machine check reporting for processors with Intel style MCE: */ void intel_p5_mcheck_init(struct cpuinfo_x86 *c) { u32 l, h; - /*Check for MCE support */ - if (!cpu_has(c, X86_FEATURE_MCE)) + /* Default P5 to off as its often misconnected: */ + if (!mce_p5_enabled) return; - /* Default P5 to off as its often misconnected */ - if (mce_disabled != -1) + /* Check for MCE support: */ + if (!cpu_has(c, X86_FEATURE_MCE)) return; + machine_check_vector = pentium_machine_check; + /* Make sure the vector pointer is visible before we enable MCEs: */ wmb(); - /* Read registers before enabling */ + /* Read registers before enabling: */ rdmsr(MSR_IA32_P5_MC_ADDR, l, h); rdmsr(MSR_IA32_P5_MC_TYPE, l, h); - printk(KERN_INFO "Intel old style machine check architecture supported.\n"); + printk(KERN_INFO + "Intel old style machine check architecture supported.\n"); - /* Enable MCE */ + /* Enable MCE: */ set_in_cr4(X86_CR4_MCE); - printk(KERN_INFO "Intel old style machine check reporting enabled on CPU#%d.\n", smp_processor_id()); + printk(KERN_INFO + "Intel old style machine check reporting enabled on CPU#%d.\n", + smp_processor_id()); } |