diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 3e665c5..ec70627 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -149,6 +149,7 @@
 
 ifeq (${DRTM_SUPPORT},1)
 BL31_SOURCES		+=	services/std_svc/drtm/drtm_main.c	\
+				services/std_svc/drtm/drtm_dma_prot.c	\
 				${MBEDTLS_SOURCES}
 endif
 
diff --git a/services/std_svc/drtm/drtm_dma_prot.c b/services/std_svc/drtm/drtm_dma_prot.c
new file mode 100644
index 0000000..9d014a0
--- /dev/null
+++ b/services/std_svc/drtm/drtm_dma_prot.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ * DRTM DMA protection.
+ *
+ * Authors:
+ *      Lucian Paul-Trifu <lucian.paultrifu@gmail.com>
+ *
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include <common/debug.h>
+
+#include "drtm_dma_prot.h"
+#include <plat/common/platform.h>
+
+/*
+ * This function checks that platform supports complete DMA protection.
+ * and returns false - if the platform supports complete DMA protection.
+ * and returns true - if the platform does not support complete DMA protection.
+ */
+bool drtm_dma_prot_init(void)
+{
+	bool must_init_fail = false;
+	const uintptr_t *smmus;
+	size_t num_smmus = 0;
+	unsigned int total_smmus;
+
+	/* Warns presence of non-host platforms */
+	if (plat_has_non_host_platforms()) {
+		WARN("DRTM: the platform includes trusted DMA-capable devices"
+				" (non-host platforms)\n");
+	}
+
+	/*
+	 * DLME protection is uncertain on platforms with peripherals whose
+	 * DMA is not managed by an SMMU. DRTM doesn't work on such platforms.
+	 */
+	if (plat_has_unmanaged_dma_peripherals()) {
+		ERROR("DRTM: this platform does not provide DMA protection\n");
+		must_init_fail = true;
+	}
+
+	/*
+	 * Check that the platform reported all SMMUs.
+	 * It is acceptable if the platform doesn't have any SMMUs when it
+	 * doesn't have any DMA-capable devices.
+	 */
+	total_smmus = plat_get_total_smmus();
+	plat_enumerate_smmus(&smmus, &num_smmus);
+	if (num_smmus != total_smmus) {
+		ERROR("DRTM: could not discover all SMMUs\n");
+		must_init_fail = true;
+	}
+
+	return must_init_fail;
+}
diff --git a/services/std_svc/drtm/drtm_dma_prot.h b/services/std_svc/drtm/drtm_dma_prot.h
new file mode 100644
index 0000000..e0c58b5
--- /dev/null
+++ b/services/std_svc/drtm/drtm_dma_prot.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2022 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-3-Clause
+ *
+ */
+#ifndef DRTM_DMA_PROT_H
+#define DRTM_DMA_PROT_H
+
+#include <stdint.h>
+
+bool drtm_dma_prot_init(void);
+
+#endif /* DRTM_DMA_PROT_H */
diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c
index c7fce5e..adb9293 100644
--- a/services/std_svc/drtm/drtm_main.c
+++ b/services/std_svc/drtm/drtm_main.c
@@ -12,15 +12,37 @@
 
 #include <stdint.h>
 
+#include <arch.h>
+#include <arch_helpers.h>
 #include <common/debug.h>
 #include <common/runtime_svc.h>
+#include <drivers/auth/crypto_mod.h>
 #include "drtm_main.h"
 #include <services/drtm_svc.h>
 
+/* This value is used by the SMC to advertise the boot PE */
+static uint64_t boot_pe_aff_value;
+
 int drtm_setup(void)
 {
+	bool rc;
+
 	INFO("DRTM service setup\n");
 
+	boot_pe_aff_value = read_mpidr_el1() & MPIDR_AFFINITY_MASK;
+
+	rc = drtm_dma_prot_init();
+	if (rc) {
+		return INTERNAL_ERROR;
+	}
+
+	/*
+	 * initialise the platform supported crypto module that will
+	 * be used by the DRTM-service to calculate hash of DRTM-
+	 * implementation specific components
+	 */
+	crypto_mod_init();
+
 	return 0;
 }
 
diff --git a/services/std_svc/drtm/drtm_main.h b/services/std_svc/drtm/drtm_main.h
index 39c67ce..4c1adac 100644
--- a/services/std_svc/drtm/drtm_main.h
+++ b/services/std_svc/drtm/drtm_main.h
@@ -11,6 +11,8 @@
 
 #include <lib/smccc.h>
 
+#include "drtm_dma_prot.h"
+
 enum drtm_retc {
 	SUCCESS = SMC_OK,
 	NOT_SUPPORTED = SMC_UNK,