util/intelmetool: Add bootguard information dump support

With this implementation it's possible to detect the state
of bootguard in intel based systems. Currently it's WIP and
in a testphase. Handle it with care!

Changes done:
* Add support for reading msr
* Read ME firmware version
* Print bootguard state for ME > 9.1
* Make argument -s legacy
* Add argument -b for bootguard (and ME) dumping
* Add argument -m for ME dumping
* Opt out early if CPU is non Intel

Change-Id: Ifeec8e20fa8efc35d7db4c6a84be1f118dccfc4a
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/16328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

util/intelmetool/msr.h

@@ -0,0 +1,30 @@
+/* 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