feat(drtm): add Event Log driver support for DRTM

Added Event Log driver support for DRTM. This driver
is responsible for the doing the hash measurement of
various DRTM components as per [1], and putting these
measurements in the Event Log buffer.

[1]: https://developer.arm.com/documentation/den0113/a, section 3.16

Change-Id: I9892c313cf6640b82e261738116fe00f7975ee12
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/services/std_svc/drtm/drtm_measurements.h b/services/std_svc/drtm/drtm_measurements.h
new file mode 100644
index 0000000..6d7a84e
--- /dev/null
+++ b/services/std_svc/drtm/drtm_measurements.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_MEASUREMENTS_H
+#define DRTM_MEASUREMENTS_H
+
+#include <stdint.h>
+
+#include "drtm_main.h"
+#include <platform_def.h>
+
+#define DRTM_EVENT_ARM_BASE		0x9000U
+#define DRTM_EVENT_TYPE(n)		(DRTM_EVENT_ARM_BASE + (unsigned int)(n))
+
+#define DRTM_EVENT_ARM_PCR_SCHEMA	DRTM_EVENT_TYPE(1)
+#define DRTM_EVENT_ARM_DCE		DRTM_EVENT_TYPE(2)
+#define DRTM_EVENT_ARM_DCE_PUBKEY	DRTM_EVENT_TYPE(3)
+#define DRTM_EVENT_ARM_DLME		DRTM_EVENT_TYPE(4)
+#define DRTM_EVENT_ARM_DLME_EP		DRTM_EVENT_TYPE(5)
+#define DRTM_EVENT_ARM_DEBUG_CONFIG	DRTM_EVENT_TYPE(6)
+#define DRTM_EVENT_ARM_NONSECURE_CONFIG	DRTM_EVENT_TYPE(7)
+#define DRTM_EVENT_ARM_DCE_SECONDARY	DRTM_EVENT_TYPE(8)
+#define DRTM_EVENT_ARM_TZFW		DRTM_EVENT_TYPE(9)
+#define DRTM_EVENT_ARM_SEPARATOR	DRTM_EVENT_TYPE(10)
+
+#define CHECK_RC(rc, func_call) { \
+	if (rc != 0) { \
+		ERROR("%s(): " #func_call "failed unexpectedly rc=%d\n",  \
+		      __func__, rc);  \
+		panic();  \
+	}  \
+}
+
+enum drtm_retc drtm_take_measurements(const struct_drtm_dl_args *a);
+void drtm_serialise_event_log(uint8_t *dst, size_t *event_log_size_out);
+
+#endif /* DRTM_MEASUREMENTS_H */