diff --git a/core/include/tos_k.h b/core/include/tos_k.h
index 69ac2ed..b2f57bf 100644
--- a/core/include/tos_k.h
+++ b/core/include/tos_k.h
@@ -68,11 +68,5 @@
 #endif
 #include <tos_global.h>
 #include <tos_version.h>
-// #ifndef portGET_TASK_LOCK()
-//   #define portGET_TASK_LOCK()
-// #endif
-// #ifndef portRELEASE_TASK_LOCK()
-//   #define portRELEASE_TASK_LOCK()
-// #endif
 #endif /* _TOS_K_H_ */
 
diff --git a/core/include/tos_sys.h b/core/include/tos_sys.h
index 8af26d5..0147129 100644
--- a/core/include/tos_sys.h
+++ b/core/include/tos_sys.h
@@ -167,15 +167,61 @@ __API__ k_err_t tos_knl_sched_lock(void);
  * @retval  K_ERR_NONE                    return successfully.
  */
 __API__ k_err_t tos_knl_sched_unlock(void);
-/////////////////new for smp//////////////////////////////////////////
+//new API for smp
 #if (USE_SMP ==1u)
-__API__ static void prvDisableInterruptsAndPortStartSchedulerOnCore( void );
-__API__ void smp_init_core0(void);
+__KNL__ static void prvDisableInterruptsAndPortStartSchedulerOnCore( void );
+__KNL__ void smp_init_core0(void);
+/**
+ * @brief init the kernels .
+ *
+ * @attention None
+ *
+ * @param   None
+ *
+ * @return  errcode
+ * @retval  Non-#K_ERR_NONE               return failed.
+ * @retval  #K_ERR_NONE                   return successfully.
+ */
+
 __API__ k_err_t tos_knl_smp_init(void);
 __KNL__ int knl_is_idle_pre(k_task_t *task);
+/**
+ * @brief start the kernels .
+ *
+ * @attention None
+ *
+ * @param   None
+ *
+ * @return  errcode
+ * @retval  Non-#K_ERR_NONE               return failed.
+ * @retval  #K_ERR_NONE                   return successfully.
+ */
 __API__ k_err_t tos_knl_start_smp(void);
 #if ( configUSE_CORE_AFFINITY == 1u )
+/**
+ * @brief Sets the core affinity mask for a task.
+ *  It sets the cores on which a task can run. configUSE_CORE_AFFINITY must
+    be defined as 1 for this function to be available.
+ *
+ * @attention None
+ *
+ * @param[in]      Task  the task which is wanted to be affinited with the specific core
+ *                 CoreAffinityMask   Define the core affinity mask
+ *                 Example usage:// on core 0 and core 2.
+ *                 uxCoreAffinityMask = ( ( 1 << 0 ) | ( 1 << 2 ) );
+ *
+ * @return  None
+ */
 __API__ void tos_TaskCoreAffinitySet( k_task_t * Task, BaseType_t CoreAffinityMask );
+/**
+ * @brief Gets the core affinity mask for a task.
+ *
+ * @attention None
+ *
+ * @param[in]      Task  the task you want to get CoreAffinityMask from
+ *
+ * @return  return the CoreAffinityMask
+ */
 __API__   BaseType_t vTaskCoreAffinityGet( const k_task_t * Task );
 #endif
 #endif
diff --git a/core/tos_sys.c b/core/tos_sys.c
index 2f8b5ad..ab10575 100644
--- a/core/tos_sys.c
+++ b/core/tos_sys.c
@@ -19,7 +19,7 @@
 #if (USE_SMP ==1u)
 
 extern uint8_t ucPrimaryCoreNum ;
-__API__ static void prvDisableInterruptsAndPortStartSchedulerOnCore( void )
+__KNL__ static void prvDisableInterruptsAndPortStartSchedulerOnCore( void )
     {
         TOS_CPU_CPSR_ALLOC();
         TOS_CPU_INT_DISABLE();
@@ -27,7 +27,7 @@ __API__ static void prvDisableInterruptsAndPortStartSchedulerOnCore( void )
         tos_knl_start();
     }
  
-__API__ void smp_init_core0(void){
+__KNL__ void smp_init_core0(void){
     /* No one else should use these! */
     spin_lock_claim( configSMP_SPINLOCK_0 );
     spin_lock_claim( configSMP_SPINLOCK_1 );