diff options
Diffstat (limited to 'arch/x86/kernel/cpu/mce/winchip.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mce/winchip.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/winchip.c b/arch/x86/kernel/cpu/mce/winchip.c new file mode 100644 index 000000000..9c9f0abd2 --- /dev/null +++ b/arch/x86/kernel/cpu/mce/winchip.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IDT Winchip specific Machine Check Exception Reporting + * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk> + */ +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/hardirq.h> + +#include <asm/processor.h> +#include <asm/traps.h> +#include <asm/tlbflush.h> +#include <asm/mce.h> +#include <asm/msr.h> + +#include "internal.h" + +/* Machine check handler for WinChip C6: */ +static noinstr void winchip_machine_check(struct pt_regs *regs) +{ + instrumentation_begin(); + pr_emerg("CPU0: Machine Check Exception.\n"); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); + instrumentation_end(); +} + +/* Set up machine check reporting on the Winchip C6 series */ +void winchip_mcheck_init(struct cpuinfo_x86 *c) +{ + u32 lo, hi; + + machine_check_vector = winchip_machine_check; + /* Make sure the vector pointer is visible before we enable MCEs: */ + wmb(); + + rdmsr(MSR_IDT_FCR1, lo, hi); + lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */ + lo &= ~(1<<4); /* Enable MCE */ + wrmsr(MSR_IDT_FCR1, lo, hi); + + cr4_set_bits(X86_CR4_MCE); + + pr_info("Winchip machine check reporting enabled on CPU#0.\n"); +} |