diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index 9deb33d..7664509 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -307,6 +307,9 @@
  ******************************************************************************/
 int plat_get_cca_attest_token(uintptr_t buf, size_t *len,
 			       uintptr_t hash, size_t hash_size);
+int plat_get_cca_realm_attest_key(uintptr_t buf, size_t *len,
+				   unsigned int type);
+
 /*******************************************************************************
  * Optional BL31 functions (may be overridden)
  ******************************************************************************/
diff --git a/include/services/rmmd_svc.h b/include/services/rmmd_svc.h
index 9b4c39f..2fbdddd 100644
--- a/include/services/rmmd_svc.h
+++ b/include/services/rmmd_svc.h
@@ -97,6 +97,25 @@
 #define SHA384_DIGEST_SIZE	48U
 #define SHA512_DIGEST_SIZE	64U
 
+/*
+ * Retrieve Realm attestation key from EL3. Only P-384 ECC curve key is
+ * supported. The arguments to this SMC are :
+ *    arg0 - Function ID.
+ *    arg1 - Realm attestation key buffer Physical address.
+ *    arg2 - Realm attestation key buffer size (in bytes).
+ *    arg3 - The type of the elliptic curve to which the requested
+ *           attestation key belongs to. The value should be one of the
+ *           defined curve types.
+ * The return arguments are :
+ *    ret0 - Status / error.
+ *    ret1 - Size of the realm attestation key if successful.
+ */
+#define RMMD_ATTEST_GET_REALM_KEY	RMM_FID(SMC_64, ATTEST_GET_REALM_KEY)
+
+/* ECC Curve types for attest key generation */
+#define ATTEST_KEY_CURVE_ECC_SECP384R1		0
+
+
 #ifndef __ASSEMBLER__
 #include <stdint.h>
 
@@ -120,5 +139,4 @@
 		uint64_t flags);
 
 #endif /* __ASSEMBLER__ */
-
 #endif /* RMMD_SVC_H */