diff --git a/include/bl32/payloads/tlk.h b/include/bl32/payloads/tlk.h
index 65fd333..910f50f 100644
--- a/include/bl32/payloads/tlk.h
+++ b/include/bl32/payloads/tlk.h
@@ -35,6 +35,7 @@
  * Generate function IDs for the Trusted OS/Apps
  */
 #define TLK_TOS_STD_FID(fid)	((fid) | 0x72000000 | (0 << 31))
+#define TLK_TA_STD_FID(fid)	((fid) | 0x70000000 | (0 << 31))
 
 /*
  * Trusted OS specific function IDs
@@ -54,9 +55,17 @@
 #define TLK_FID_SHARED_MEMBUF	(0x32000005 | (1 << 31))
 
 /*
+ * Trusted Application specific function IDs
+ */
+#define TLK_OPEN_TA_SESSION	TLK_TA_STD_FID(0x1)
+#define TLK_CLOSE_TA_SESSION	TLK_TA_STD_FID(0x2)
+#define TLK_TA_LAUNCH_OP	TLK_TA_STD_FID(0x3)
+#define TLK_TA_SEND_EVENT	TLK_TA_STD_FID(0x4)
+
+/*
  * Total number of function IDs implemented for services offered to NS clients.
  */
-#define TLK_NUM_FID		0
+#define TLK_NUM_FID		7
 
 /* TLK implementation version numbers */
 #define TLK_VERSION_MAJOR	0x0 /* Major version */
diff --git a/services/spd/tlkd/tlkd_main.c b/services/spd/tlkd/tlkd_main.c
index bea4c48..c22203b 100644
--- a/services/spd/tlkd/tlkd_main.c
+++ b/services/spd/tlkd/tlkd_main.c
@@ -193,6 +193,10 @@
 	/* Passing a NULL context is a critical programming error */
 	assert(handle);
 
+	/* These SMCs are only supported by CPU0 */
+	if ((read_mpidr() & MPIDR_CPU_MASK) != 0)
+		SMC_RET1(handle, SMC_UNK);
+
 	/* Determine which security state this SMC originated from */
 	ns = is_caller_non_secure(flags);
 
@@ -267,9 +271,16 @@
 	 * b. register shared memory with the SP for passing args
 	 *    required for maintaining sessions with the Trusted
 	 *    Applications.
+	 * c. open/close sessions
+	 * d. issue commands to the Trusted Apps
 	 */
 	case TLK_REGISTER_LOGBUF:
 	case TLK_REGISTER_REQBUF:
+	case TLK_OPEN_TA_SESSION:
+	case TLK_CLOSE_TA_SESSION:
+	case TLK_TA_LAUNCH_OP:
+	case TLK_TA_SEND_EVENT:
+
 		if (!ns || !tlk_args_results_buf)
 			SMC_RET1(handle, SMC_UNK);
 
@@ -442,3 +453,25 @@
 	NULL,
 	tlkd_smc_handler
 );
+
+/* Define a SPD runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tap_fast,
+
+	OEN_TAP_START,
+	OEN_TAP_END,
+	SMC_TYPE_FAST,
+	NULL,
+	tlkd_smc_handler
+);
+
+/* Define a SPD runtime service descriptor for standard SMC calls */
+DECLARE_RT_SVC(
+	tlkd_tap_std,
+
+	OEN_TAP_START,
+	OEN_TAP_END,
+	SMC_TYPE_STD,
+	NULL,
+	tlkd_smc_handler
+);