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/*
* Athlon specific Machine Check Exception Reporting
* (C) Copyright 2002 Dave Jones <davej@redhat.com>
*/
#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>
/* Machine Check Handler For AMD Athlon/Duron: */
static void k7_machine_check(struct pt_regs *regs, long error_code)
{
u32 alow, ahigh, high, low;
u32 mcgstl, mcgsth;
int recover = 1;
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 = 1; i < nr_mce_banks; i++) {
rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high);
if (high & (1<<31)) {
char misc[20];
char addr[24];
misc[0] = '\0';
addr[0] = '\0';
if (high & (1<<29))
recover |= 1;
if (high & (1<<25))
recover |= 2;
high &= ~(1<<31);
if (high & (1<<27)) {
rdmsr(MSR_IA32_MC0_MISC+i*4, alow, ahigh);
snprintf(misc, 20, "[%08x%08x]", ahigh, alow);
}
if (high & (1<<26)) {
rdmsr(MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
snprintf(addr, 24, " at %08x%08x", ahigh, alow);
}
printk(KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
smp_processor_id(), i, high, low, misc, addr);
/* Clear it: */
wrmsr(MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
/* Serialize: */
wmb();
add_taint(TAINT_MACHINE_CHECK);
}
}
if (recover & 2)
panic("CPU context corrupt");
if (recover & 1)
panic("Unable to continue");
printk(KERN_EMERG "Attempting to continue.\n");
mcgstl &= ~(1<<2);
wrmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
}
/* AMD K7 machine check is Intel like: */
void amd_mcheck_init(struct cpuinfo_x86 *c)
{
u32 l, h;
int i;
if (!cpu_has(c, X86_FEATURE_MCE))
return;
machine_check_vector = k7_machine_check;
/* Make sure the vector pointer is visible before we enable MCEs: */
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;
/*
* Clear status for MC index 0 separately, we don't touch CTL,
* as some K7 Athlons cause spurious MCEs when its enabled:
*/
if (boot_cpu_data.x86 == 6) {
wrmsr(MSR_IA32_MC0_STATUS, 0x0, 0x0);
i = 1;
} else
i = 0;
for (; i < nr_mce_banks; i++) {
wrmsr(MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
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());
}
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