2 * P6 specific Machine Check Exception Reporting
3 * (C) Copyright 2002 Alan Cox <alan@redhat.com>
6 #include <linux/init.h>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
10 #include <linux/interrupt.h>
11 #include <linux/smp.h>
13 #include <asm/processor.h>
14 #include <asm/system.h>
19 /* Machine Check Handler For PII/PIII */
20 static fastcall void intel_machine_check(struct pt_regs * regs, long error_code)
23 u32 alow, ahigh, high, low;
27 rdmsr (MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
28 if (mcgstl & (1<<0)) /* Recoverable ? */
31 printk (KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
32 smp_processor_id(), mcgsth, mcgstl);
34 for (i=0; i<nr_mce_banks; i++) {
35 rdmsr (MSR_IA32_MC0_STATUS+i*4,low, high);
41 printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
44 rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
45 printk ("[%08x%08x]", ahigh, alow);
48 rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
49 printk (" at %08x%08x", ahigh, alow);
56 panic ("CPU context corrupt");
58 panic ("Unable to continue");
60 printk (KERN_EMERG "Attempting to continue.\n");
62 * Do not clear the MSR_IA32_MCi_STATUS if the error is not
63 * recoverable/continuable.This will allow BIOS to look at the MSRs
64 * for errors if the OS could not log the error.
66 for (i=0; i<nr_mce_banks; i++) {
68 msr = MSR_IA32_MC0_STATUS+i*4;
69 rdmsr (msr,low, high);
72 wrmsr (msr, 0UL, 0UL);
75 add_taint(TAINT_MACHINE_CHECK);
79 wrmsr (MSR_IA32_MCG_STATUS,mcgstl, mcgsth);
82 /* Set up machine check reporting for processors with Intel style MCE */
83 void __devinit intel_p6_mcheck_init(struct cpuinfo_x86 *c)
88 /* Check for MCE support */
89 if (!cpu_has(c, X86_FEATURE_MCE))
92 /* Check for PPro style MCA */
93 if (!cpu_has(c, X86_FEATURE_MCA))
96 /* Ok machine check is available */
97 machine_check_vector = intel_machine_check;
100 printk (KERN_INFO "Intel machine check architecture supported.\n");
101 rdmsr (MSR_IA32_MCG_CAP, l, h);
102 if (l & (1<<8)) /* Control register present ? */
103 wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
104 nr_mce_banks = l & 0xff;
106 /* Don't enable bank 0 on intel P6 cores, it goes bang quickly. */
107 for (i=1; i<nr_mce_banks; i++) {
108 wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
109 wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
112 set_in_cr4 (X86_CR4_MCE);
113 printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",