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diff --git a/firmware/2lib/include/2constants.h b/firmware/2lib/include/2constants.h
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+++ b/firmware/2lib/include/2constants.h
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+/* Copyright 2019 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.
+ *
+ * General vboot-related constants.
+ *
+ * Constants that need to be exposed to assembly files or linker scripts
+ * may be placed here and imported via vb2_constants.h.
+ */
+
+#ifndef VBOOT_REFERENCE_2CONSTANTS_H_
+#define VBOOT_REFERENCE_2CONSTANTS_H_
+
+/*
+ * Size of non-volatile data used by vboot.
+ *
+ * If you only support non-volatile data format V1, then use VB2_NVDATA_SIZE.
+ * If you support V2, use VB2_NVDATA_SIZE_V2 and set context flag
+ * VB2_CONTEXT_NVDATA_V2.
+ */
+#define VB2_NVDATA_SIZE 16
+#define VB2_NVDATA_SIZE_V2 64
+
+/* Size of secure data spaces used by vboot */
+#define VB2_SECDATA_SIZE 10
+#define VB2_SECDATAK_SIZE 14
+
+/*
+ * Recommended size of work buffer for firmware verification stage.
+ *
+ * TODO: The recommended size really depends on which key algorithms are
+ * used.  Should have a better / more accurate recommendation than this.
+ */
+#define VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE (12 * 1024)
+
+/*
+ * Recommended size of work buffer for kernel verification stage.
+ *
+ * This is bigger because vboot 2.0 kernel preambles are usually padded to
+ * 64 KB.
+ *
+ * TODO: The recommended size really depends on which key algorithms are
+ * used.  Should have a better / more accurate recommendation than this.
+ */
+#define VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE (80 * 1024)
+
+/* Recommended buffer size for vb2api_get_pcr_digest. */
+#define VB2_PCR_DIGEST_RECOMMENDED_SIZE 32
+
+#endif  /* VBOOT_REFERENCE_2CONSTANTS_H_ */