1 files changed, 119 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/p6.c b/arch/x86/kernel/cpu/mcheck/p6.c
new file mode 100644
index 00000000000..deeae42ce19
--- /dev/null
+++ b/arch/x86/kernel/cpu/mcheck/p6.c
@@ -0,0 +1,119 @@
+/*
+ * P6 specific Machine Check Exception Reporting
+ * (C) Copyright 2002 Alan Cox <alan@redhat.com>
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+
+#include <asm/processor.h> 
+#include <asm/system.h>
+#include <asm/msr.h>
+
+#include "mce.h"
+
+/* Machine Check Handler For PII/PIII */
+static fastcall void intel_machine_check(struct pt_regs * regs, long error_code)
+{
+        int recover=1;
+        u32 alow, ahigh, high, low;
+        u32 mcgstl, mcgsth;
+        int i;
+
+        rdmsr (MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
+        if (mcgstl & (1<<0))    /* Recoverable ? */
+                recover=0;
+
+        printk (KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
+                smp_processor_id(), mcgsth, mcgstl);
+
+        for (i=0; i<nr_mce_banks; i++) {
+                rdmsr (MSR_IA32_MC0_STATUS+i*4,low, high);
+                if (high & (1<<31)) {
+                        if (high & (1<<29))
+                                recover |= 1;
+                        if (high & (1<<25))
+                                recover |= 2;
+                        printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
+                        high &= ~(1<<31);
+                        if (high & (1<<27)) {
+                                rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
+                                printk ("[%08x%08x]", ahigh, alow);
+                        }
+                        if (high & (1<<26)) {
+                                rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
+                                printk (" at %08x%08x", ahigh, alow);
+                        }
+                        printk ("\n");
+                }
+        }
+
+        if (recover & 2)
+                panic ("CPU context corrupt");
+        if (recover & 1)
+                panic ("Unable to continue");
+
+        printk (KERN_EMERG "Attempting to continue.\n");
+        /* 
+         * Do not clear the MSR_IA32_MCi_STATUS if the error is not 
+         * recoverable/continuable.This will allow BIOS to look at the MSRs
+         * for errors if the OS could not log the error.
+         */
+        for (i=0; i<nr_mce_banks; i++) {
+                unsigned int msr;
+                msr = MSR_IA32_MC0_STATUS+i*4;
+                rdmsr (msr,low, high);
+                if (high & (1<<31)) {
+                        /* Clear it */
+                        wrmsr (msr, 0UL, 0UL);
+                        /* Serialize */
+                        wmb();
+                        add_taint(TAINT_MACHINE_CHECK);
+                }
+        }
+        mcgstl &= ~(1<<2);
+        wrmsr (MSR_IA32_MCG_STATUS,mcgstl, mcgsth);
+}
+
+/* Set up machine check reporting for processors with Intel style MCE */
+void intel_p6_mcheck_init(struct cpuinfo_x86 *c)
+{
+        u32 l, h;
+        int i;
+        
+        /* Check for MCE support */
+        if (!cpu_has(c, X86_FEATURE_MCE))
+                return;
+
+        /* Check for PPro style MCA */
+        if (!cpu_has(c, X86_FEATURE_MCA))
+                return;
+
+        /* Ok machine check is available */
+        machine_check_vector = intel_machine_check;
+        wmb();
+
+        printk (KERN_INFO "Intel machine check architecture supported.\n");
+        rdmsr (MSR_IA32_MCG_CAP, l, h);
+        if (l & (1<<8)) /* Control register present ? */
+                wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
+        nr_mce_banks = l & 0xff;
+
+        /*
+         * Following the example in IA-32 SDM Vol 3:
+         * - MC0_CTL should not be written
+         * - Status registers on all banks should be cleared on reset
+         */
+        for (i=1; i<nr_mce_banks; i++)
+                wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
+
+        for (i=0; i<nr_mce_banks; i++)
+                wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
+
+        set_in_cr4 (X86_CR4_MCE);
+        printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
+                smp_processor_id());
+}