1 files changed, 43 insertions, 0 deletions
diff --git a/firmware/lib/vboot_common_init.c b/firmware/lib/vboot_common_init.c
new file mode 100644
index 00000000..9d6670ea
--- /dev/null
+++ b/firmware/lib/vboot_common_init.c
@@ -0,0 +1,43 @@
+/* Copyright (c) 2013 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.
+ *
+ * Common functions between firmware and kernel verified boot.
+ * (Firmware portion)
+ */
+
+#include "vboot_api.h"
+#include "vboot_common.h"
+#include "utility.h"
+
+int VbSharedDataInit(VbSharedDataHeader *header, uint64_t size)
+{
+	VBDEBUG(("VbSharedDataInit, %d bytes, header %d bytes\n", (int)size,
+		 sizeof(VbSharedDataHeader)));
+
+	if (size < sizeof(VbSharedDataHeader)) {
+		VBDEBUG(("Not enough data for header.\n"));
+		return VBOOT_SHARED_DATA_INVALID;
+	}
+	if (size < VB_SHARED_DATA_MIN_SIZE) {
+		VBDEBUG(("Shared data buffer too small.\n"));
+		return VBOOT_SHARED_DATA_INVALID;
+	}
+
+	if (!header)
+		return VBOOT_SHARED_DATA_INVALID;
+
+	/* Zero the header */
+	Memset(header, 0, sizeof(VbSharedDataHeader));
+
+	/* Initialize fields */
+	header->magic = VB_SHARED_DATA_MAGIC;
+	header->struct_version = VB_SHARED_DATA_VERSION;
+	header->struct_size = sizeof(VbSharedDataHeader);
+	header->data_size = size;
+	header->data_used = sizeof(VbSharedDataHeader);
+	header->firmware_index = 0xFF;
+
+	/* Success */
+	return VBOOT_SUCCESS;
+}