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/config.h>
10 #include <linux/irq.h>
11 #include <linux/interrupt.h>
12 #include <linux/smp.h>
14 #include <asm/processor.h>
15 #include <asm/system.h>
20 /* Machine Check Handler For AMD Athlon/Duron */
21 static fastcall void k7_machine_check(struct pt_regs * regs, long error_code)
24 u32 alow, ahigh, high, low;
28 rdmsr (MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
29 if (mcgstl & (1<<0)) /* Recoverable ? */
32 printk (KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
33 smp_processor_id(), mcgsth, mcgstl);
35 for (i=1; i<nr_mce_banks; i++) {
36 rdmsr (MSR_IA32_MC0_STATUS+i*4,low, high);
42 printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
45 rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
46 printk ("[%08x%08x]", ahigh, alow);
49 rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
50 printk (" at %08x%08x", ahigh, alow);
54 wrmsr (MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
57 add_taint(TAINT_MACHINE_CHECK);
62 panic ("CPU context corrupt");
64 panic ("Unable to continue");
65 printk (KERN_EMERG "Attempting to continue.\n");
67 wrmsr (MSR_IA32_MCG_STATUS,mcgstl, mcgsth);
71 /* AMD K7 machine check is Intel like */
72 void __devinit amd_mcheck_init(struct cpuinfo_x86 *c)
77 machine_check_vector = k7_machine_check;
80 printk (KERN_INFO "Intel machine check architecture supported.\n");
81 rdmsr (MSR_IA32_MCG_CAP, l, h);
82 if (l & (1<<8)) /* Control register present ? */
83 wrmsr (MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
84 nr_mce_banks = l & 0xff;
86 /* Clear status for MC index 0 separately, we don't touch CTL,
87 * as some Athlons cause spurious MCEs when its enabled. */
88 wrmsr (MSR_IA32_MC0_STATUS, 0x0, 0x0);
89 for (i=1; i<nr_mce_banks; i++) {
90 wrmsr (MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
91 wrmsr (MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
94 set_in_cr4 (X86_CR4_MCE);
95 printk (KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",