diff --git a/trunk/bootrom/build/libraries/os/common/os_timer.c b/trunk/bootrom/build/libraries/os/common/os_timer.c
index 0e2daf7..a6a037e 100644
--- a/trunk/bootrom/build/libraries/os/common/os_timer.c
+++ b/trunk/bootrom/build/libraries/os/common/os_timer.c
@@ -305,6 +305,65 @@ void osStopTimer64( void )
 #endif // SDK_ARM9
 
 #ifdef SDK_ARM11
+#include <brom/code32.h>
+/*---------------------------------------------------------------------------*
+  Name:         osGetPerformanceMonitor
+
+  Description:  Get Performance Monitor
+
+  Arguments:    monitorNum : monitorNo (0-2)
+
+  Returns:      count
+ *---------------------------------------------------------------------------*/
+ASM u32 osGetPerformanceMonitor( OSMoniter mon )
+{
+        cmp     r0, #__cpp(OS_MONITOR_1)
+        beq     FSYM(1)
+        cmp     r0, #__cpp(OS_MONITOR_2)
+        beq     FSYM(2)
+        mrc     p15, 0, r0, c15, c12, 1
+        b       FSYM(3)
+LSYM(1)
+        mrc     p15, 0, r0, c15, c12, 2
+        b       FSYM(3)
+LSYM(2)
+        mrc     p15, 0, r0, c15, c12, 3
+LSYM(3)
+        bx      lr
+}
+
+/*---------------------------------------------------------------------------*
+  Name:         osSetPerformanceMonitor
+
+  Description:  Set Performance Monitor
+
+  Arguments:    monitorNum : monitorNo (0-2)
+                count
+
+  Returns:      previous count
+ *---------------------------------------------------------------------------*/
+ASM u32 osSetPerformanceMonitor( OSMoniter mon, u32 count )
+{
+        cmp     r0, #__cpp(OS_MONITOR_1)
+        beq     FSYM(1)
+        cmp     r0, #__cpp(OS_MONITOR_2)
+        beq     FSYM(2)
+        mrc     p15, 0, r0, c15, c12, 1
+        mcr     p15, 0, r1, c15, c12, 1
+        b       FSYM(3)
+LSYM(1)
+        mrc     p15, 0, r0, c15, c12, 1
+        mcr     p15, 0, r1, c15, c12, 1
+        b       FSYM(3)
+LSYM(2)
+        mrc     p15, 0, r0, c15, c12, 1
+        mcr     p15, 0, r1, c15, c12, 1
+LSYM(3)
+        bx      lr
+}
+
+#include <brom/codereset.h>
+
 /*---------------------------------------------------------------------------*
   Name:         osIsEnableTimerReload
 
diff --git a/trunk/bootrom/include/brom/os/common/timer.h b/trunk/bootrom/include/brom/os/common/timer.h
index 32bbcaf..aeaa8e3 100644
--- a/trunk/bootrom/include/brom/os/common/timer.h
+++ b/trunk/bootrom/include/brom/os/common/timer.h
@@ -54,6 +54,16 @@ typedef enum
 }
 OSTimer;
 
+//---- monitor number
+typedef enum
+{
+    OS_MONITOR_0 = 0,
+    OS_MONITOR_1 = 1,
+    OS_MONITOR_2 = 2,
+    OS_MONITOR_NUM
+}
+OSMoniter;
+
 #else // SDK_ARM9
 //---- control
 typedef u16 OSTimerControl;
@@ -258,6 +268,29 @@ void    osStopTimer64( void );
 #endif // SDK_ARM9
 
 #ifdef SDK_ARM11
+/*---------------------------------------------------------------------------*
+  Name:         osGetPerformanceMonitor
+
+  Description:  Get Performance Monitor
+
+  Arguments:    monitorNum : monitorNo (0-2)
+
+  Returns:      count
+ *---------------------------------------------------------------------------*/
+u32 osGetPerformanceMonitor( OSMoniter id );
+
+/*---------------------------------------------------------------------------*
+  Name:         osSetPerformanceMonitor
+
+  Description:  Set Performance Monitor
+
+  Arguments:    monitorNum : monitorNo (0-2)
+                count
+
+  Returns:      previous count
+ *---------------------------------------------------------------------------*/
+u32 osSetPerformanceMonitor( OSMoniter id, u32 count );
+
 /*---------------------------------------------------------------------------*
   Name:         osIsEnableTimerReload