feat(drivers/measured_boot): add RSS backend
Runtime Security Subsystem (RSS) provides for the host:
- Runtime service to store measurments, which were
computed by the host during measured boot.
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: Ia9e4e8a1fe8f01a28da1fd8c434b780f2a08f94e
diff --git a/drivers/measured_boot/rss/rss_measured_boot.mk b/drivers/measured_boot/rss/rss_measured_boot.mk
new file mode 100644
index 0000000..01545af
--- /dev/null
+++ b/drivers/measured_boot/rss/rss_measured_boot.mk
@@ -0,0 +1,35 @@
+#
+# Copyright (c) 2022, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Hash algorithm for measured boot
+# SHA-256 (or stronger) is required.
+# TODO: The measurement algorithm incorrectly suggests that the TPM backend
+# is used which may not be the case. It is currently being worked on and
+# soon TPM_HASH_ALG will be replaced by a more generic name.
+TPM_HASH_ALG := sha256
+
+ifeq (${TPM_HASH_ALG}, sha512)
+ MBOOT_ALG_ID := MBOOT_ALG_SHA512
+ MBOOT_DIGEST_SIZE := 64U
+else ifeq (${TPM_HASH_ALG}, sha384)
+ MBOOT_ALG_ID := MBOOT_ALG_SHA384
+ MBOOT_DIGEST_SIZE := 48U
+else
+ MBOOT_ALG_ID := MBOOT_ALG_SHA256
+ MBOOT_DIGEST_SIZE := 32U
+endif #TPM_HASH_ALG
+
+# Set definitions for Measured Boot driver.
+$(eval $(call add_defines,\
+ $(sort \
+ MBOOT_ALG_ID \
+ MBOOT_DIGEST_SIZE \
+ MBOOT_RSS_BACKEND \
+)))
+
+MEASURED_BOOT_SRC_DIR := drivers/measured_boot/rss/
+
+MEASURED_BOOT_SOURCES += ${MEASURED_BOOT_SRC_DIR}rss_measured_boot.c