From a1df417e74aa6dae7352dc8cbb0ad471af5b7c69 Mon Sep 17 00:00:00 2001
From: "Michael J. Chudobiak" <mjc@avtechpulse.com>
Date: Mon, 25 Apr 2016 10:00:44 -0400
Subject: initial Olimex linux tree from Daniel, originally Feb 3, 2016

---
 linux/arch/x86/kernel/cpu/mcheck/winchip.c | 44 ++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 linux/arch/x86/kernel/cpu/mcheck/winchip.c

(limited to 'linux/arch/x86/kernel/cpu/mcheck/winchip.c')

diff --git a/linux/arch/x86/kernel/cpu/mcheck/winchip.c b/linux/arch/x86/kernel/cpu/mcheck/winchip.c
new file mode 100644
index 00000000..44f13829
--- /dev/null
+++ b/linux/arch/x86/kernel/cpu/mcheck/winchip.c
@@ -0,0 +1,44 @@
+/*
+ * 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 <asm/processor.h>
+#include <asm/traps.h>
+#include <asm/tlbflush.h>
+#include <asm/mce.h>
+#include <asm/msr.h>
+
+/* Machine check handler for WinChip C6: */
+static void winchip_machine_check(struct pt_regs *regs, long error_code)
+{
+	enum ctx_state prev_state = ist_enter(regs);
+
+	printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
+	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
+
+	ist_exit(regs, prev_state);
+}
+
+/* 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);
+
+	printk(KERN_INFO
+	       "Winchip machine check reporting enabled on CPU#0.\n");
+}
-- 
cgit