1 /* 2 * IDT Winchip specific Machine Check Exception Reporting 3 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk> 4 */ 5 #include <linux/interrupt.h> 6 #include <linux/kernel.h> 7 #include <linux/types.h> 8 9 #include <asm/processor.h> 10 #include <asm/traps.h> 11 #include <asm/tlbflush.h> 12 #include <asm/mce.h> 13 #include <asm/msr.h> 14 15 /* Machine check handler for WinChip C6: */ winchip_machine_check(struct pt_regs * regs,long error_code)16static void winchip_machine_check(struct pt_regs *regs, long error_code) 17 { 18 ist_enter(regs); 19 20 printk(KERN_EMERG "CPU0: Machine Check Exception.\n"); 21 add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); 22 23 ist_exit(regs); 24 } 25 26 /* Set up machine check reporting on the Winchip C6 series */ winchip_mcheck_init(struct cpuinfo_x86 * c)27void winchip_mcheck_init(struct cpuinfo_x86 *c) 28 { 29 u32 lo, hi; 30 31 machine_check_vector = winchip_machine_check; 32 /* Make sure the vector pointer is visible before we enable MCEs: */ 33 wmb(); 34 35 rdmsr(MSR_IDT_FCR1, lo, hi); 36 lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */ 37 lo &= ~(1<<4); /* Enable MCE */ 38 wrmsr(MSR_IDT_FCR1, lo, hi); 39 40 cr4_set_bits(X86_CR4_MCE); 41 42 printk(KERN_INFO 43 "Winchip machine check reporting enabled on CPU#0.\n"); 44 } 45