Update PCR state with the state of the firmware keyblock flags too.

I re-factored the extend call into its own module, since it doesn't necessarily
need to be couple with rollbackfirmwaresetup.

BUG=chrome-os-partner:2372
TEST=Tried emerge-x86-generic and emerge-arm-generic vboot_reference.

Change-Id: I0d3115b10b686133e63e304570325ebdbd50ae3a

Review URL: http://codereview.chromium.org/6696006

firmware/lib/include/tpm_bootmode.h

@@ -0,0 +1,25 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Functions for updating the TPM state with the status of boot path.
+ */
+
+#ifndef VBOOT_REFERENCE_TPM_BOOTMODE_H_
+#define VBOOT_REFERENCE_TPM_BOOTMODE_H_
+
+#include "sysincludes.h"
+
+/* Update TPM PCR State with the boot path status.
+ *  [developer_mode]: State of the developer switch.
+ *  [recovery_mode}: State of the recovery mode.
+ *  [fw_keyblock_flags]: Keyblock flags on the to-be-booted
+ *                       RW firmware keyblock.
+ *
+ *  Returns: TPM_SUCCESS if the TPM extend operation succeeds.
+ */
+
+uint32_t SetTPMBootModeState(int developer_mode, int recovery_mode,
+                             int fw_keyblock_flags);
+
+#endif  /* VBOOT_REFERENCE_TPM_BOOTMODE_H_ */