2 * Athlon/Hammer specific Machine Check Exception Reporting
3 * (C) Copyright 2002 Dave Jones <davej@codemonkey.org.uk>
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 fastcall 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);
40 printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
43 rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
44 printk ("[%08x%08x]", ahigh, alow);
47 rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
48 printk (" at %08x%08x", ahigh, alow);
52 wrmsr (MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
55 add_taint(TAINT_MACHINE_CHECK);
60 panic ("CPU context corrupt");
62 panic ("Unable to continue");
63 printk (KERN_EMERG "Attempting to continue.\n");
65 wrmsr (MSR_IA32_MCG_STATUS,mcgstl, mcgsth);
69 /* AMD K7 machine check is Intel like */
70 void amd_mcheck_init(struct cpuinfo_x86 *c)
75 machine_check_vector = k7_machine_check;
78 printk (KERN_INFO "Intel machine check architecture supported.\n");
79 rdmsr (MSR_IA32_MCG_CAP, l, h);
80 if (l & (1<<8)) /* Control register present ? */
81 wrmsr (MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
82 nr_mce_banks = l & 0xff;
84 /* Clear status for MC index 0 separately, we don't touch CTL,
85 * as some Athlons cause spurious MCEs when its enabled. */
86 wrmsr (MSR_IA32_MC0_STATUS, 0x0, 0x0);
87 for (i=1; i<nr_mce_banks; i++) {
88 wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
89 wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
92 set_in_cr4 (X86_CR4_MCE);
93 printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",