feat(measured-boot): add measured boot drivers
Introduces core measured boot support, including TPM event log handling,
hashing infrastructure, and event formatting per TCG spec. The driver is
imported from the existing implementation in TF-A.
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: Ib2e6a88c86f110f9a6907c3e6dbb0dc736486de9
diff --git a/lib/event_log/event_log.mk b/lib/event_log/event_log.mk
new file mode 100644
index 0000000..df55c62
--- /dev/null
+++ b/lib/event_log/event_log.mk
@@ -0,0 +1,54 @@
+#
+# Copyright (c) 2020-2025, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Path to library sources
+EVENT_LOG_SRC_DIR := lib/event_log/
+
+# Default log level to dump the event log (LOG_LEVEL_INFO)
+EVENT_LOG_LEVEL ?= 40
+
+EVENT_LOG_SOURCES := ${EVENT_LOG_SRC_DIR}event_print.c
+
+INCLUDES += -Iinclude/lib/event_log \
+ -Iinclude/drivers/auth
+
+ifdef CRYPTO_SUPPORT
+# Measured Boot hash algorithm.
+# SHA-256 (or stronger) is required for all devices that are TPM 2.0 compliant.
+ifdef TPM_HASH_ALG
+ $(warning "TPM_HASH_ALG is deprecated. Please use MBOOT_EL_HASH_ALG instead.")
+ MBOOT_EL_HASH_ALG := ${TPM_HASH_ALG}
+else
+ MBOOT_EL_HASH_ALG := sha256
+endif
+
+ifeq (${MBOOT_EL_HASH_ALG}, sha512)
+ TPM_ALG_ID := TPM_ALG_SHA512
+ TCG_DIGEST_SIZE := 64U
+else ifeq (${MBOOT_EL_HASH_ALG}, sha384)
+ TPM_ALG_ID := TPM_ALG_SHA384
+ TCG_DIGEST_SIZE := 48U
+else
+ TPM_ALG_ID := TPM_ALG_SHA256
+ TCG_DIGEST_SIZE := 32U
+endif #MBOOT_EL_HASH_ALG
+
+# Set definitions for event log library.
+$(eval $(call add_define,TFTF_DEFINES,TPM_ALG_ID))
+$(eval $(call add_define,TFTF_DEFINES,EVENT_LOG_LEVEL))
+$(eval $(call add_define,TFTF_DEFINES,TCG_DIGEST_SIZE))
+
+EVENT_LOG_SOURCES := ${EVENT_LOG_SRC_DIR}event_log.c
+
+INCLUDES += -Iinclude/lib/event_log \
+ -Iinclude/drivers/auth
+
+ifeq (${TRANSFER_LIST}, 1)
+EVENT_LOG_SOURCES += ${EVENT_LOG_SRC_DIR}/event_handoff.c
+INCLUDES += -Iinclude/lib
+endif
+
+endif