Convert some ports to use xTaskIncrementTick() in place of vTaskIncrementTick().

Move DSB instructions to before WFI instructions in line with ARM recommendations.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@1915 1d2547de-c912-0410-9cb9-b8ca96c0e9e2

27 files changed, 128 insertions, 142 deletions

diff --git a/FreeRTOS/Source/portable/BCC/16BitDOS/Flsh186/port.c b/FreeRTOS/Source/portable/BCC/16BitDOS/Flsh186/port.c
index 52b9bdeb4..6d7effbfc 100644
--- a/FreeRTOS/Source/portable/BCC/16BitDOS/Flsh186/port.c
+++ b/FreeRTOS/Source/portable/BCC/16BitDOS/Flsh186/port.c
@@ -195,10 +195,11 @@ is being used. */
 	static void __interrupt __far prvPreemptiveTick( void )

 	{

 		/* Get the scheduler to update the task states following the tick. */

-		vTaskIncrementTick();

-

-		/* Switch in the context of the next task to be run. */

-		portSWITCH_CONTEXT();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Switch in the context of the next task to be run. */

+			portSWITCH_CONTEXT();

+		}

 

 		/* Reset the PIC ready for the next time. */

 		portRESET_PIC();

@@ -208,7 +209,7 @@ is being used. */
 	{

 		/* Same as preemptive tick, but the cooperative scheduler is being used

 		so we don't have to switch in the context of the next task. */

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 		portRESET_PIC();

 	}

 #endif

diff --git a/FreeRTOS/Source/portable/BCC/16BitDOS/PC/port.c b/FreeRTOS/Source/portable/BCC/16BitDOS/PC/port.c
index a5874f999..4e9f8650f 100644
--- a/FreeRTOS/Source/portable/BCC/16BitDOS/PC/port.c
+++ b/FreeRTOS/Source/portable/BCC/16BitDOS/PC/port.c
@@ -216,10 +216,11 @@ scheduler is being used. */
 	static void __interrupt __far prvPreemptiveTick( void )

 	{

 		/* Get the scheduler to update the task states following the tick. */

-		vTaskIncrementTick();

-

-		/* Switch in the context of the next task to be run. */

-		portSWITCH_CONTEXT();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Switch in the context of the next task to be run. */

+			portSWITCH_CONTEXT();

+		}

 

 		/* Reset the PIC ready for the next time. */

 		prvPortResetPIC();

@@ -229,7 +230,7 @@ scheduler is being used. */
 	{

 		/* Same as preemptive tick, but the cooperative scheduler is being used

 		so we don't have to switch in the context of the next task. */

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 		prvPortResetPIC();

 	}

 #endif

diff --git a/FreeRTOS/Source/portable/CCS/MSP430X/portext.asm b/FreeRTOS/Source/portable/CCS/MSP430X/portext.asm
index 8e89f9b67..1d5d79e1d 100644
--- a/FreeRTOS/Source/portable/CCS/MSP430X/portext.asm
+++ b/FreeRTOS/Source/portable/CCS/MSP430X/portext.asm
@@ -57,7 +57,7 @@
 

 	.include data_model.h

 

-	.global vTaskIncrementTick

+	.global xTaskIncrementTick

 	.global vTaskSwitchContext

 	.global vPortSetupTimerInterrupt

 	.global pxCurrentTCB

@@ -112,7 +112,7 @@ vPortPreemptiveTickISR: .asmfunc
 	push.w sr

 	portSAVE_CONTEXT

 				

-	call_x	#vTaskIncrementTick

+	call_x	#xTaskIncrementTick

 	call_x	#vTaskSwitchContext

 		

 	portRESTORE_CONTEXT

@@ -128,7 +128,7 @@ vPortCooperativeTickISR: .asmfunc
 	push.w sr

 	portSAVE_CONTEXT

 				

-	call_x	#vTaskIncrementTick

+	call_x	#xTaskIncrementTick

 		

 	portRESTORE_CONTEXT

 	

diff --git a/FreeRTOS/Source/portable/CodeWarrior/ColdFire_V1/port.c b/FreeRTOS/Source/portable/CodeWarrior/ColdFire_V1/port.c
index 2f4ae0fd6..b048b53e8 100644
--- a/FreeRTOS/Source/portable/CodeWarrior/ColdFire_V1/port.c
+++ b/FreeRTOS/Source/portable/CodeWarrior/ColdFire_V1/port.c
@@ -220,16 +220,11 @@ unsigned long ulSavedInterruptMask;
 	/* Increment the RTOS tick. */

 	ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			taskYIELD();

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );

-

-	/* If we are using the pre-emptive scheduler then also request a

-	context switch as incrementing the tick could have unblocked a task. */

-	#if configUSE_PREEMPTION == 1

-	{

-		taskYIELD();

-	}

-	#endif

 }

 

diff --git a/FreeRTOS/Source/portable/CodeWarrior/HCS12/port.c b/FreeRTOS/Source/portable/CodeWarrior/HCS12/port.c
index e1bbe7ae7..5dd8a8ec0 100644
--- a/FreeRTOS/Source/portable/CodeWarrior/HCS12/port.c
+++ b/FreeRTOS/Source/portable/CodeWarrior/HCS12/port.c
@@ -260,11 +260,10 @@ void interrupt vPortTickInterrupt( void )
 		portSAVE_CONTEXT();

 

 		/* Increment the tick ... */

-		vTaskIncrementTick();

-

-		/* ... then see if the new tick value has necessitated a

-		context switch. */

-		vTaskSwitchContext();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			vTaskSwitchContext();

+		}

 

 		TFLG1 = 1;								   

 

@@ -274,7 +273,7 @@ void interrupt vPortTickInterrupt( void )
 	}

 	#else

 	{

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 		TFLG1 = 1;

 	}

 	#endif

diff --git a/FreeRTOS/Source/portable/GCC/ARM7_AT91FR40008/portISR.c b/FreeRTOS/Source/portable/GCC/ARM7_AT91FR40008/portISR.c
index 60a0d214a..ef503e61c 100644
--- a/FreeRTOS/Source/portable/GCC/ARM7_AT91FR40008/portISR.c
+++ b/FreeRTOS/Source/portable/GCC/ARM7_AT91FR40008/portISR.c
@@ -161,7 +161,7 @@ void vPortYieldProcessor( void )
 		/* Clear tick timer interrupt indication. */

 		ulDummy = portTIMER_REG_BASE_PTR->TC_SR;  

 

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 

 		/* Acknowledge the interrupt at AIC level... */

 		AT91C_BASE_AIC->AIC_EOICR = portCLEAR_AIC_INTERRUPT;

@@ -186,8 +186,10 @@ void vPortYieldProcessor( void )
 

 		/* Increment the RTOS tick count, then look for the highest priority 

 		task that is ready to run. */

-		vTaskIncrementTick();

-		vTaskSwitchContext();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			vTaskSwitchContext();

+		}

 

 		/* Acknowledge the interrupt at AIC level... */

 		AT91C_BASE_AIC->AIC_EOICR = portCLEAR_AIC_INTERRUPT;

diff --git a/FreeRTOS/Source/portable/GCC/ARM7_AT91SAM7S/portISR.c b/FreeRTOS/Source/portable/GCC/ARM7_AT91SAM7S/portISR.c
index ac40e1ded..7eed8348c 100644
--- a/FreeRTOS/Source/portable/GCC/ARM7_AT91SAM7S/portISR.c
+++ b/FreeRTOS/Source/portable/GCC/ARM7_AT91SAM7S/portISR.c
@@ -163,7 +163,7 @@ void vPortYieldProcessor( void )
 		/* Increment the tick count - which may wake some tasks but as the

 		preemptive scheduler is not being used any woken task is not given

 		processor time no matter what its priority. */

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 		

 		/* Clear the PIT interrupt. */

 		ulDummy = AT91C_BASE_PITC->PITC_PIVR;

@@ -183,10 +183,11 @@ void vPortYieldProcessor( void )
 		portSAVE_CONTEXT();			

 

 		/* Increment the tick count - this may wake a task. */

-		vTaskIncrementTick();

-

-		/* Find the highest priority task that is ready to run. */

-		vTaskSwitchContext();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Find the highest priority task that is ready to run. */

+			vTaskSwitchContext();

+		}

 		

 		/* End the interrupt in the AIC. */

 		AT91C_BASE_AIC->AIC_EOICR = AT91C_BASE_PITC->PITC_PIVR;;

diff --git a/FreeRTOS/Source/portable/GCC/ARM7_LPC2000/portISR.c b/FreeRTOS/Source/portable/GCC/ARM7_LPC2000/portISR.c
index f4b15b176..02dbf8eee 100644
--- a/FreeRTOS/Source/portable/GCC/ARM7_LPC2000/portISR.c
+++ b/FreeRTOS/Source/portable/GCC/ARM7_LPC2000/portISR.c
@@ -166,7 +166,7 @@ void vTickISR( void )
 

 	/* Increment the RTOS tick count, then look for the highest priority 

 	task that is ready to run. */

-	__asm volatile( "bl vTaskIncrementTick" );

+	__asm volatile( "bl xTaskIncrementTick" );

 

 	#if configUSE_PREEMPTION == 1

 		__asm volatile( "bl vTaskSwitchContext" );

diff --git a/FreeRTOS/Source/portable/GCC/ARM7_LPC23xx/portISR.c b/FreeRTOS/Source/portable/GCC/ARM7_LPC23xx/portISR.c
index 3f89bd5c5..e39026f1c 100644
--- a/FreeRTOS/Source/portable/GCC/ARM7_LPC23xx/portISR.c
+++ b/FreeRTOS/Source/portable/GCC/ARM7_LPC23xx/portISR.c
@@ -150,7 +150,7 @@ void vPortYieldProcessor( void )
 	void vNonPreemptiveTick( void ) __attribute__ ((interrupt ("IRQ")));

 	void vNonPreemptiveTick( void )

 	{	

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 		T0IR = 2;

 		VICVectAddr = portCLEAR_VIC_INTERRUPT;

 	}

@@ -167,7 +167,7 @@ void vPortYieldProcessor( void )
 

 		/* Increment the RTOS tick count, then look for the highest priority 

 		task that is ready to run. */

-		__asm volatile( "bl vTaskIncrementTick" );

+		__asm volatile( "bl xTaskIncrementTick" );

 		__asm volatile( "bl vTaskSwitchContext" );

 

 		/* Ready for the next interrupt. */

diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM0/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM0/port.c
index 6b8a8a84f..d0540db2f 100644
--- a/FreeRTOS/Source/portable/GCC/ARM_CM0/port.c
+++ b/FreeRTOS/Source/portable/GCC/ARM_CM0/port.c
@@ -293,14 +293,14 @@ void xPortSysTickHandler( void )
 {

 unsigned long ulDummy;

 

-	/* If using preemption, also force a context switch. */

-	#if configUSE_PREEMPTION == 1

-		*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;

-	#endif

-

 	ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		/* Increment the RTOS tick. */

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Pend a context switch. */

+			*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );

 }

diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c
index a0bfe1d39..8acc0a53f 100644
--- a/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c
+++ b/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c
@@ -354,11 +354,6 @@ void xPortPendSVHandler( void )
 

 void xPortSysTickHandler( void )

 {

-	/* If using preemption, also force a context switch. */

-	#if configUSE_PREEMPTION == 1

-		portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

-	#endif

-

 	/* Only reset the systick load register if configUSE_TICKLESS_IDLE is set to

 	1.  If it is set to 0 tickless idle is not being used.  If it is set to a

 	value other than 0 or 1 then a timer other than the SysTick is being used

@@ -367,9 +362,18 @@ void xPortSysTickHandler( void )
 		portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick;

 	#endif

 

+	/* The SysTick runs at the lowest interrupt priority, so when this interrupt

+	executes all interrupts must be unmasked.  There is therefore no need to

+	save and then restore the interrupt mask value as its value is already

+	known. */

 	( void ) portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* A context switch is required.  Context switching is performed in

+			the PendSV interrupt.  Pend the PendSV interrupt. */

+			portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );

 }

@@ -444,8 +448,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__asm volatile( "wfi" );

 				__asm volatile( "dsb" );

+				__asm volatile( "wfi" );

 				__asm volatile( "isb" );

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );

diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM3_MPU/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM3_MPU/port.c
index 4d4870136..ffc58598a 100644
--- a/FreeRTOS/Source/portable/GCC/ARM_CM3_MPU/port.c
+++ b/FreeRTOS/Source/portable/GCC/ARM_CM3_MPU/port.c
@@ -452,14 +452,14 @@ void xPortSysTickHandler( void )
 {

 unsigned long ulDummy;

 

-	/* If using preemption, also force a context switch. */

-	#if configUSE_PREEMPTION == 1

-		*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;

-	#endif

-

 	ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		/* Increment the RTOS tick. */

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Pend a context switch. */

+			*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );

 }

diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c
index 56ec249bb..23e194bbe 100644
--- a/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c
+++ b/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c
@@ -387,11 +387,6 @@ void xPortPendSVHandler( void )
 

 void xPortSysTickHandler( void )

 {

-	/* If using preemption, also force a context switch. */

-	#if configUSE_PREEMPTION == 1

-		portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

-	#endif

-

 	/* Only reset the systick load register if configUSE_TICKLESS_IDLE is set to

 	1.  If it is set to 0 tickless idle is not being used.  If it is set to a

 	value other than 0 or 1 then a timer other than the SysTick is being used

@@ -402,7 +397,12 @@ void xPortSysTickHandler( void )
 

 	( void ) portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		/* Increment the RTOS tick count. */

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* Pend a context switch. */

+			portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );

 }

@@ -477,8 +477,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__asm volatile( "wfi" );

 				__asm volatile( "dsb" );

+				__asm volatile( "wfi" );

 				__asm volatile( "isb" );

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );

diff --git a/FreeRTOS/Source/portable/GCC/ATMega323/port.c b/FreeRTOS/Source/portable/GCC/ATMega323/port.c
index d53607a67..29f40d4c2 100644
--- a/FreeRTOS/Source/portable/GCC/ATMega323/port.c
+++ b/FreeRTOS/Source/portable/GCC/ATMega323/port.c
@@ -393,8 +393,10 @@ void vPortYieldFromTick( void ) __attribute__ ( ( naked ) );
 void vPortYieldFromTick( void )

 {

 	portSAVE_CONTEXT();

-	vTaskIncrementTick();

-	vTaskSwitchContext();

+	if( xTaskIncrementTick() != pdFALSE )

+	{

+		vTaskSwitchContext();

+	}

 	portRESTORE_CONTEXT();

 

 	asm volatile ( "ret" );

@@ -463,7 +465,7 @@ unsigned char ucHighByte, ucLowByte;
 	void SIG_OUTPUT_COMPARE1A( void ) __attribute__ ( ( signal ) );

 	void SIG_OUTPUT_COMPARE1A( void )

 	{

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 	}

 #endif

 

diff --git a/FreeRTOS/Source/portable/GCC/AVR32_UC3/port.c b/FreeRTOS/Source/portable/GCC/AVR32_UC3/port.c
index 691b71201..43cbc4b4c 100644
--- a/FreeRTOS/Source/portable/GCC/AVR32_UC3/port.c
+++ b/FreeRTOS/Source/portable/GCC/AVR32_UC3/port.c
@@ -254,7 +254,7 @@ __attribute__((__naked__)) static void vTick( void )
 	/* Because FreeRTOS is not supposed to run with nested interrupts, put all OS

 	calls in a critical section . */

 	portENTER_CRITICAL();

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 	portEXIT_CRITICAL();

 

 	/* Restore the context of the "elected task". */

diff --git a/FreeRTOS/Source/portable/GCC/CORTUS_APS3/port.c b/FreeRTOS/Source/portable/GCC/CORTUS_APS3/port.c
index 9e5b31564..bfed6932f 100644
--- a/FreeRTOS/Source/portable/GCC/CORTUS_APS3/port.c
+++ b/FreeRTOS/Source/portable/GCC/CORTUS_APS3/port.c
@@ -170,12 +170,11 @@ void interrupt31_handler( void )
 static void prvProcessTick( void ) __attribute__((noinline));

 static void prvProcessTick( void )

 {

-	vTaskIncrementTick();

-

-	#if configUSE_PREEMPTION == 1

+	if( xTaskIncrementTick() != pdFALSE )

+	{

 		vTaskSwitchContext();

-	#endif

-

+	}

+		

 	/* Clear the Tick Interrupt. */

 	counter1->expired = 0;

 }

diff --git a/FreeRTOS/Source/portable/GCC/H8S2329/port.c b/FreeRTOS/Source/portable/GCC/H8S2329/port.c
index ce1e53abc..d30499231 100644
--- a/FreeRTOS/Source/portable/GCC/H8S2329/port.c
+++ b/FreeRTOS/Source/portable/GCC/H8S2329/port.c
@@ -293,8 +293,10 @@ void vPortYield( void )
 	{

 		portSAVE_STACK_POINTER();

 		

-		vTaskIncrementTick();

-		vTaskSwitchContext();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			vTaskSwitchContext();

+		}

 

 		/* Clear the interrupt. */

 		TSR1 &= ~0x01;

@@ -312,7 +314,7 @@ void vPortYield( void )
 	void vTickISR( void ) __attribute__ ( ( interrupt_handler ) );

 	void vTickISR( void )

 	{

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 

 		/* Clear the interrupt. */

 		TSR1 &= ~0x01;

diff --git a/FreeRTOS/Source/portable/GCC/HCS12/port.c b/FreeRTOS/Source/portable/GCC/HCS12/port.c
index 8835eb118..c551de1bf 100644
--- a/FreeRTOS/Source/portable/GCC/HCS12/port.c
+++ b/FreeRTOS/Source/portable/GCC/HCS12/port.c
@@ -263,11 +263,11 @@ void vPortTickInterrupt( void )
 		portSAVE_CONTEXT();

 

 		/* Increment the tick ... */

-		vTaskIncrementTick();

-

-		/* ... then see if the new tick value has necessitated a

-		context switch. */

-		vTaskSwitchContext();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			/* A context switch is necessary. */

+			vTaskSwitchContext();

+		}

 

 		/* Restore the context of a task - which may be a different task

 		to that interrupted. */

@@ -275,7 +275,7 @@ void vPortTickInterrupt( void )
 	}

 	#else

 	{

-		vTaskIncrementTick();

+		xTaskIncrementTick();

 	}

 	#endif

 

diff --git a/FreeRTOS/Source/portable/GCC/MCF5235/port.c b/FreeRTOS/Source/portable/GCC/MCF5235/port.c
index 837ad44bb..f5b6e4f68 100644
--- a/FreeRTOS/Source/portable/GCC/MCF5235/port.c
+++ b/FreeRTOS/Source/portable/GCC/MCF5235/port.c
@@ -194,7 +194,7 @@ prvPortPreemptiveTick ( void )
      * simply increment the system tick.

      */

 

-    vTaskIncrementTick(  );

+    xTaskIncrementTick();

     MCF_PIT_PCSR0 |= MCF_PIT_PCSR_PIF;

 }

 

@@ -209,8 +209,10 @@ prvPortPreemptiveTick( void )
 #endif

     portSAVE_CONTEXT(  );

     MCF_PIT_PCSR0 |= MCF_PIT_PCSR_PIF;

-    vTaskIncrementTick(  );

-    vTaskSwitchContext(  );

+    if( xTaskIncrementTick() != pdFALSE )

+	{

+		vTaskSwitchContext(  );

+	}

     portRESTORE_CONTEXT(  );

 }

 #endif

diff --git a/FreeRTOS/Source/portable/GCC/MicroBlaze/port.c b/FreeRTOS/Source/portable/GCC/MicroBlaze/port.c
index d2c552905..4d796f741 100644
--- a/FreeRTOS/Source/portable/GCC/MicroBlaze/port.c
+++ b/FreeRTOS/Source/portable/GCC/MicroBlaze/port.c
@@ -359,17 +359,14 @@ void vTickISR( void *pvBaseAddress )
 unsigned long ulCSR;

 

 	/* Increment the RTOS tick - this might cause a task to unblock. */

-	vTaskIncrementTick();

+	if( xTaskIncrementTick() != pdFALSE )

+	{

+		vTaskSwitchContext();

+	}

 

 	/* Clear the timer interrupt */

 	ulCSR = XTmrCtr_mGetControlStatusReg(XPAR_OPB_TIMER_1_BASEADDR, 0);	

 	XTmrCtr_mSetControlStatusReg( XPAR_OPB_TIMER_1_BASEADDR, portCOUNTER_0, ulCSR );

-

-	/* If we are using the preemptive scheduler then we also need to determine

-	if this tick should cause a context switch. */

-	#if configUSE_PREEMPTION == 1

-		vTaskSwitchContext();

-	#endif

 }

 /*-----------------------------------------------------------*/

 

diff --git a/FreeRTOS/Source/portable/GCC/MicroBlazeV8/port.c b/FreeRTOS/Source/portable/GCC/MicroBlazeV8/port.c
index f3f5a95a0..d85a428fc 100644
--- a/FreeRTOS/Source/portable/GCC/MicroBlazeV8/port.c
+++ b/FreeRTOS/Source/portable/GCC/MicroBlazeV8/port.c
@@ -433,15 +433,11 @@ extern void vApplicationClearTimerInterrupt( void );
 	vApplicationClearTimerInterrupt();

 

 	/* Increment the RTOS tick - this might cause a task to unblock. */

-	vTaskIncrementTick();

-

-	/* If the preemptive scheduler is being used then a context switch should be

-	requested in case incrementing the tick unblocked a task, or a time slice

-	should cause another task to enter the Running state. */

-	#if configUSE_PREEMPTION == 1

+	if( xTaskIncrementTick() != pdFALSE )

+	{

 		/* Force vTaskSwitchContext() to be called as the interrupt exits. */

 		ulTaskSwitchRequested = 1;

-	#endif

+	}

 }

 /*-----------------------------------------------------------*/

 

diff --git a/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c b/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c
index c8104c6be..d2ea44745 100644
--- a/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c
+++ b/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c
@@ -250,11 +250,6 @@ void vPortExitCritical( void )
 

 void xPortSysTickHandler( void )

 {

-	/* If using preemption, also force a context switch. */

-	#if configUSE_PREEMPTION == 1

-		portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

-	#endif

-

 	/* Only reset the systick load register if configUSE_TICKLESS_IDLE is set to

 	1.  If it is set to 0 tickless idle is not being used.  If it is set to a

 	value other than 0 or 1 then a timer other than the SysTick is being used

@@ -265,7 +260,10 @@ void xPortSysTickHandler( void )
 

 	( void ) portSET_INTERRUPT_MASK_FROM_ISR();

 	{

-		vTaskIncrementTick();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;

+		}

 	}

 	portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );

 }

@@ -340,8 +338,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__WFI();

 				__DSB();

+				__WFI();

 				__ISB();

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );

diff --git a/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c b/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c
index 3d55afae4..a9264f3fc 100644
--- a/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c
+++ b/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c
@@ -365,8 +365,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__WFI();

 				__DSB();

+				__WFI();

 				__ISB();

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );

diff --git a/FreeRTOS/Source/portable/IAR/RX600/port.c b/FreeRTOS/Source/portable/IAR/RX600/port.c
index 86bfbd436..0306bb7de 100644
--- a/FreeRTOS/Source/portable/IAR/RX600/port.c
+++ b/FreeRTOS/Source/portable/IAR/RX600/port.c
@@ -56,19 +56,19 @@
     ***************************************************************************

 

 

-    http://www.FreeRTOS.org - Documentation, books, training, latest versions, 

+    http://www.FreeRTOS.org - Documentation, books, training, latest versions,

     license and Real Time Engineers Ltd. contact details.

 

     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,

     including FreeRTOS+Trace - an indispensable productivity tool, and our new

     fully thread aware and reentrant UDP/IP stack.

 

-    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 

-    Integrity Systems, who sell the code with commercial support, 

+    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High

+    Integrity Systems, who sell the code with commercial support,

     indemnification and middleware, under the OpenRTOS brand.

-    

-    http://www.SafeRTOS.com - High Integrity Systems also provide a safety 

-    engineered and independently SIL3 certified version for use in safety and 

+

+    http://www.SafeRTOS.com - High Integrity Systems also provide a safety

+    engineered and independently SIL3 certified version for use in safety and

     mission critical applications that require provable dependability.

 */

 

@@ -119,13 +119,13 @@ extern void *pxCurrentTCB;
 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )

 {

 	/* R0 is not included as it is the stack pointer. */

-	

+

 	*pxTopOfStack = 0x00;

 	pxTopOfStack--;

  	*pxTopOfStack = portINITIAL_PSW;

 	pxTopOfStack--;

 	*pxTopOfStack = ( portSTACK_TYPE ) pxCode;

-	

+

 	/* When debugging it can be useful if every register is set to a known

 	value.  Otherwise code space can be saved by just setting the registers

 	that need to be set. */

@@ -166,9 +166,9 @@ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE
 		pxTopOfStack -= 15;

 	}

 	#endif

-	

+

 	*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R1 */

-	pxTopOfStack--;				

+	pxTopOfStack--;

 	*pxTopOfStack = portINITIAL_FPSW;

 	pxTopOfStack--;

 	*pxTopOfStack = 0x12345678; /* Accumulator. */

@@ -191,12 +191,12 @@ extern void vApplicationSetupTimerInterrupt( void );
 		use.  A demo application is provided to show a suitable example. */

 		vApplicationSetupTimerInterrupt();

 

-		/* Enable the software interrupt. */		

+		/* Enable the software interrupt. */

 		_IEN( _ICU_SWINT ) = 1;

-		

+

 		/* Ensure the software interrupt is clear. */

 		_IR( _ICU_SWINT ) = 0;

-		

+

 		/* Ensure the software interrupt is set to the kernel priority. */

 		_IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;

 

@@ -214,19 +214,17 @@ __interrupt void vTickISR( void )
 {

 	/* Re-enable interrupts. */

 	__enable_interrupt();

-	

+

 	/* Increment the tick, and perform any processing the new tick value

 	necessitates. */

 	__set_interrupt_level( configMAX_SYSCALL_INTERRUPT_PRIORITY );

 	{

-		vTaskIncrementTick();

+		if( xTaskIncrementTick() != pdFALSE )

+		{

+			taskYIELD();

+		}

 	}

 	__set_interrupt_level( configKERNEL_INTERRUPT_PRIORITY );

-	

-	/* Only select a new task if the preemptive scheduler is being used. */

-	#if( configUSE_PREEMPTION == 1 )

-		taskYIELD();

-	#endif

 }

 /*-----------------------------------------------------------*/

 

diff --git a/FreeRTOS/Source/portable/MSVC-MingW/port.c b/FreeRTOS/Source/portable/MSVC-MingW/port.c
index 8b82a8c96..a19858de5 100644
--- a/FreeRTOS/Source/portable/MSVC-MingW/port.c
+++ b/FreeRTOS/Source/portable/MSVC-MingW/port.c
@@ -301,18 +301,7 @@ static unsigned long prvProcessTickInterrupt( void )
 unsigned long ulSwitchRequired;

 

 	/* Process the tick itself. */

-	vTaskIncrementTick();

-	#if( configUSE_PREEMPTION != 0 )

-	{

-		/* A context switch is only automatically performed from the tick

-		interrupt if the pre-emptive scheduler is being used. */

-		ulSwitchRequired = pdTRUE;

-	}

-	#else

-	{

-		ulSwitchRequired = pdFALSE;

-	}

-	#endif

+	ulSwitchRequired = ( unsigned long ) xTaskIncrementTick();

 

 	return ulSwitchRequired;

 }

diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c
index f1a982aca..c721f1fe3 100644
--- a/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c
+++ b/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c
@@ -417,8 +417,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__wfi();

 				__dsb( portSY_FULL_READ_WRITE );

+				__wfi();

 				__isb( portSY_FULL_READ_WRITE );

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );

diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c
index d935dedfc..345f386bf 100644
--- a/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c
+++ b/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c
@@ -480,8 +480,8 @@ void xPortSysTickHandler( void )
 			configPRE_SLEEP_PROCESSING( xModifiableIdleTime );

 			if( xModifiableIdleTime > 0 )

 			{

-				__wfi();

 				__dsb( portSY_FULL_READ_WRITE );

+				__wfi();

 				__isb( portSY_FULL_READ_WRITE );

 			}

 			configPOST_SLEEP_PROCESSING( xExpectedIdleTime );