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diff --git a/util/intelmetool/msr.h b/util/intelmetool/msr.h
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+/* intelmetool
+ *
+ * Copyright (C) 2013-2016 Philipp Deppenwiese <zaolin@das-labor.org>
+ * Copyright (C) 2013-2016 Alexander Couzens <lynxis@fe80.eu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <inttypes.h>
+
+#ifndef __DARWIN__
+
+#define MSR_BOOTGUARD 0x13A
+
+typedef struct {
+ unsigned int ebx;
+ unsigned int edx;
+ unsigned int ecx;
+} regs_t;
+
+extern int msr_bootguard(uint64_t *msr, int debug);
+#endif