2 * Athlon specific Machine Check Exception Reporting
3 * (C) Copyright 2002 Dave Jones <davej@redhat.com>
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 AMD Athlon/Duron */
19 static void k7_machine_check(struct pt_regs *regs, long error_code)
22 u32 alow, ahigh, high, low;
26 rdmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
27 if (mcgstl & (1<<0)) /* Recoverable ? */
30 printk(KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
31 smp_processor_id(), mcgsth, mcgstl);
33 for (i = 1; i < nr_mce_banks; i++) {
34 rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high);
38 misc[0] = addr[0] = '\0';
45 rdmsr(MSR_IA32_MC0_MISC+i*4, alow, ahigh);
46 snprintf(misc, 20, "[%08x%08x]", ahigh, alow);
49 rdmsr(MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
50 snprintf(addr, 24, " at %08x%08x", ahigh, alow);
52 printk(KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
53 smp_processor_id(), i, high, low, misc, addr);
55 wrmsr(MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
58 add_taint(TAINT_MACHINE_CHECK);
63 panic("CPU context corrupt");
65 panic("Unable to continue");
66 printk(KERN_EMERG "Attempting to continue.\n");
68 wrmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
72 /* AMD K7 machine check is Intel like */
73 void amd_mcheck_init(struct cpuinfo_x86 *c)
78 if (!cpu_has(c, X86_FEATURE_MCE))
81 machine_check_vector = k7_machine_check;
84 printk(KERN_INFO "Intel machine check architecture supported.\n");
85 rdmsr(MSR_IA32_MCG_CAP, l, h);
86 if (l & (1<<8)) /* Control register present ? */
87 wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
88 nr_mce_banks = l & 0xff;
90 /* Clear status for MC index 0 separately, we don't touch CTL,
91 * as some K7 Athlons cause spurious MCEs when its enabled. */
92 if (boot_cpu_data.x86 == 6) {
93 wrmsr(MSR_IA32_MC0_STATUS, 0x0, 0x0);
97 for (; i < nr_mce_banks; i++) {
98 wrmsr(MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
99 wrmsr(MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
102 set_in_cr4(X86_CR4_MCE);
103 printk(KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",