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Add barrier instructions to GCC CM3/4 code.

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This commit is contained in:
Richard Barry 2013-04-07 19:43:52 +00:00
parent a7fb62cb9c
commit 6d20e2b5cd
1 changed files with 15 additions and 6 deletions
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21
FreeRTOS/Source/portable/GCC/ARM_CM3/port.c
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@ -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.
*/
@ -259,6 +259,11 @@ void vPortYieldFromISR( void )
{
/* Set a PendSV to request a context switch. */
portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
/* Barriers are normally not required but do ensure the code is completely
within the specified behaviour for the architecture. */
__asm volatile( "dsb" );
__asm volatile( "isb" );
}
/*-----------------------------------------------------------*/
@ -266,6 +271,8 @@ void vPortEnterCritical( void )
{
portDISABLE_INTERRUPTS();
uxCriticalNesting++;
__asm volatile( "dsb" );
__asm volatile( "isb" );
}
/*-----------------------------------------------------------*/
@ -438,6 +445,8 @@ void xPortSysTickHandler( void )
if( xModifiableIdleTime > 0 )
{
__asm volatile( "wfi" );
__asm volatile( "dsb" );
__asm volatile( "isb" );
}
configPOST_SLEEP_PROCESSING( xExpectedIdleTime );