diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c
new file mode 100644
index 0000000..c7fce5e
--- /dev/null
+++ b/services/std_svc/drtm/drtm_main.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM service
+ *
+ * Authors:
+ *	Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ *	Brian Nezvadovitz <brinez@microsoft.com> 2021-02-01
+ */
+
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include "drtm_main.h"
+#include <services/drtm_svc.h>
+
+int drtm_setup(void)
+{
+	INFO("DRTM service setup\n");
+
+	return 0;
+}
+
+uint64_t drtm_smc_handler(uint32_t smc_fid,
+			  uint64_t x1,
+			  uint64_t x2,
+			  uint64_t x3,
+			  uint64_t x4,
+			  void *cookie,
+			  void *handle,
+			  uint64_t flags)
+{
+	/* Check that the SMC call is from the Normal World. */
+	if (!is_caller_non_secure(flags)) {
+		SMC_RET1(handle, NOT_SUPPORTED);
+	}
+
+	switch (smc_fid) {
+	case ARM_DRTM_SVC_VERSION:
+		INFO("DRTM service handler: version\n");
+		/* Return the version of current implementation */
+		SMC_RET1(handle, ARM_DRTM_VERSION);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_FEATURES:
+		if (((x1 >> ARM_DRTM_FUNC_SHIFT) & ARM_DRTM_FUNC_MASK) ==
+		    ARM_DRTM_FUNC_ID) {
+			/* Dispatch function-based queries. */
+			switch (x1 & FUNCID_MASK) {
+			case ARM_DRTM_SVC_VERSION:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_FEATURES:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_UNPROTECT_MEM:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_CLOSE_LOCALITY:
+				WARN("ARM_DRTM_SVC_CLOSE_LOCALITY feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_GET_ERROR:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_SET_ERROR:
+				SMC_RET1(handle, SUCCESS);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_SET_TCB_HASH:
+				WARN("ARM_DRTM_SVC_TCB_HASH feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			case ARM_DRTM_SVC_LOCK_TCB_HASH:
+				WARN("ARM_DRTM_SVC_LOCK_TCB_HASH feature %s",
+				     "is not supported\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+
+			default:
+				ERROR("Unknown DRTM service function\n");
+				SMC_RET1(handle, NOT_SUPPORTED);
+				break;	/* not reached */
+			}
+		}
+
+	case ARM_DRTM_SVC_UNPROTECT_MEM:
+		INFO("DRTM service handler: unprotect mem\n");
+		SMC_RET1(handle, SMC_OK);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_DYNAMIC_LAUNCH:
+		INFO("DRTM service handler: dynamic launch\n");
+		SMC_RET1(handle, SMC_OK);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_CLOSE_LOCALITY:
+		WARN("DRTM service handler: close locality %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_GET_ERROR:
+		INFO("DRTM service handler: get error\n");
+		SMC_RET2(handle, SMC_OK, 0);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_SET_ERROR:
+		INFO("DRTM service handler: set error\n");
+		SMC_RET1(handle, SMC_OK);
+		break;	/* not reached */
+
+	case ARM_DRTM_SVC_SET_TCB_HASH:
+		WARN("DRTM service handler: set TCB hash %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;  /* not reached */
+
+	case ARM_DRTM_SVC_LOCK_TCB_HASH:
+		WARN("DRTM service handler: lock TCB hash %s\n",
+		     "is not supported");
+		SMC_RET1(handle, NOT_SUPPORTED);
+		break;  /* not reached */
+
+	default:
+		ERROR("Unknown DRTM service function: 0x%x\n", smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+		break;	/* not reached */
+	}
+
+	/* not reached */
+	SMC_RET1(handle, SMC_UNK);
+}
diff --git a/services/std_svc/drtm/drtm_main.h b/services/std_svc/drtm/drtm_main.h
new file mode 100644
index 0000000..39c67ce
--- /dev/null
+++ b/services/std_svc/drtm/drtm_main.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_MAIN_H
+#define DRTM_MAIN_H
+
+#include <stdint.h>
+
+#include <lib/smccc.h>
+
+enum drtm_retc {
+	SUCCESS = SMC_OK,
+	NOT_SUPPORTED = SMC_UNK,
+	INVALID_PARAMETERS = -2,
+	DENIED = -3,
+	NOT_FOUND = -4,
+	INTERNAL_ERROR = -5,
+	MEM_PROTECT_INVALID = -6,
+};
+
+#endif /* DRTM_MAIN_H */