diff --git a/bsp/sam7x/drivers/board.c b/bsp/sam7x/drivers/board.c
index 16dfacb9be..1e13656f66 100644
--- a/bsp/sam7x/drivers/board.c
+++ b/bsp/sam7x/drivers/board.c
@@ -154,7 +154,7 @@ static void rt_hw_console_init()
 /**
  * This function will initial sam7x board.
  */
-void rt_hw_board_init()
+void rt_hw_board_init(void)
 {
 	extern void rt_serial_init(void);
 	
diff --git a/libcpu/arm/AT91SAM7X/interrupt.c b/libcpu/arm/AT91SAM7X/interrupt.c
index 1aced87b29..71884f9f3f 100644
--- a/libcpu/arm/AT91SAM7X/interrupt.c
+++ b/libcpu/arm/AT91SAM7X/interrupt.c
@@ -10,8 +10,10 @@
  * Change Logs:
  * Date           Author       Notes
  * 2006-08-23     Bernard      first version
+ * 2013-03-29     aozima       Modify the interrupt interface implementations.
  */
 
+#include <rtthread.h>
 #include <rthw.h>
 #include "AT91SAM7X256.h"
 
@@ -30,7 +32,7 @@ rt_uint32_t rt_thread_switch_interrupt_flag;
  */
 /*@{*/
 
-void rt_hw_interrupt_handler(int vector)
+static void rt_hw_interrupt_handler(int vector, void *param)
 {
 	rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
 }
@@ -38,7 +40,7 @@ void rt_hw_interrupt_handler(int vector)
 /**
  * This function will initialize hardware interrupt
  */
-void rt_hw_interrupt_init()
+void rt_hw_interrupt_init(void)
 {
 	rt_base_t index;
 
@@ -96,7 +98,6 @@ rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
 									void *param, char *name)
 {
 	rt_isr_handler_t old_handler = RT_NULL;
-
 	if(vector >= 0 && vector < MAX_HANDLERS)
 	{
 		old_handler = irq_desc[vector].handler;
diff --git a/libcpu/arm/AT91SAM7X/trap.c b/libcpu/arm/AT91SAM7X/trap.c
index 4b21f81c1c..74d1cba445 100644
--- a/libcpu/arm/AT91SAM7X/trap.c
+++ b/libcpu/arm/AT91SAM7X/trap.c
@@ -22,7 +22,7 @@
  */
 /*@{*/
 
-void rt_hw_trap_irq()
+void rt_hw_trap_irq(void)
 {
 	int irqno;
 	extern struct rt_irq_desc irq_desc[]; 
@@ -37,13 +37,13 @@ void rt_hw_trap_irq()
 	AT91C_BASE_AIC->AIC_EOICR = 0;
 }
 
-void rt_hw_trap_fiq()
+void rt_hw_trap_fiq(void)
 {
     rt_kprintf("fast interrupt request\n");
 }
 
 extern struct rt_thread* rt_current_thread;
-void rt_hw_trap_abort()
+void rt_hw_trap_abort(void)
 {
 	rt_kprintf("Abort occured!!! Thread [%s] suspended.\n",rt_current_thread->name);
 	rt_thread_suspend(rt_current_thread);