feat(dice): add QCBOR library as a dependency of DPE

DPE commands are CBOR encoded. QCBOR library is used
in TF-A for CBOR encoding.

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: Ifd01e1e6e1477cf991e765b97c446684fc6ef9b9

docs/getting_started/prerequisites.rst

@@ -79,6 +79,10 @@ support:
 
 - mbed TLS == 3.4.1 (tag: ``mbedtls-3.4.1``)
 
+The following libraries are required for DICE Protection Environment support:
+
+- QCBOR == 1.2 (tag: ``v1.2``)
+
 These tools are optional:
 
 - Device Tree Compiler (DTC) >= 1.4.7
@@ -184,7 +188,7 @@ documentation, available `here <https://git-scm.com/docs/githooks>`_.
 
 --------------
 
-*Copyright (c) 2021-2023, Arm Limited. All rights reserved.*
+*Copyright (c) 2021-2024, Arm Limited. All rights reserved.*
 
 .. _Arm Developer website: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/downloads
 .. _Gerrit Code Review: https://www.gerritcodereview.com/

drivers/measured_boot/rss/qcbor.mk

@@ -0,0 +1,23 @@
+#
+# Copyright (c) 2024, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# TF-A was tested with v1.2 version of QCBOR
+
+ifeq (${QCBOR_DIR},)
+        $(error Error: QCBOR_DIR not set)
+endif
+
+QCBOR_SOURCES	+=	${QCBOR_DIR}/src/qcbor_encode.c \
+			${QCBOR_DIR}/src/qcbor_decode.c \
+			${QCBOR_DIR}/src/UsefulBuf.c
+
+QCBOR_INCLUDES	+=	${QCBOR_DIR}/inc
+
+# Floating point numbers are not used, so disable the support.
+# This reduces the library size as well.
+$(eval $(call add_define,QCBOR_DISABLE_FLOAT_HW_USE))
+$(eval $(call add_define,USEFULBUF_DISABLE_ALL_FLOAT))
+$(eval $(call add_define,QCBOR_DISABLE_PREFERRED_FLOAT))