[rtems commit] arm: Add ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    7c90670c81b213610a43f55d065f5b86fd6e646b
Changeset: http://git.rtems.org/rtems/commit/?id=7c90670c81b213610a43f55d065f5b86fd6e646b

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Mon Jun  2 13:23:07 2014 +0200

arm: Add ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS

---

 cpukit/score/cpu/arm/rtems/score/arm.h |    1 +
 cpukit/score/cpu/arm/rtems/score/cpu.h |    6 ++++++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/cpukit/score/cpu/arm/rtems/score/arm.h b/cpukit/score/cpu/arm/rtems/score/arm.h
index bb78cbe..a105f17 100644
--- a/cpukit/score/cpu/arm/rtems/score/arm.h
+++ b/cpukit/score/cpu/arm/rtems/score/arm.h
@@ -42,6 +42,7 @@ extern "C" {
   || defined(__ARM_ARCH_7M__)
   #define ARM_MULTILIB_HAS_WFI
   #define ARM_MULTILIB_HAS_LOAD_STORE_EXCLUSIVE
+  #define ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS
 #endif
 
 #if defined(__ARM_ARCH_7A__) \
diff --git a/cpukit/score/cpu/arm/rtems/score/cpu.h b/cpukit/score/cpu/arm/rtems/score/cpu.h
index d53be60..ad070df 100644
--- a/cpukit/score/cpu/arm/rtems/score/cpu.h
+++ b/cpukit/score/cpu/arm/rtems/score/cpu.h
@@ -301,17 +301,23 @@ extern uint32_t arm_cpu_mode;
 
 static inline void _ARM_Data_memory_barrier( void )
 {
+#ifdef ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS
   __asm__ volatile ( "dmb" : : : "memory" );
+#endif
 }
 
 static inline void _ARM_Data_synchronization_barrier( void )
 {
+#ifdef ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS
   __asm__ volatile ( "dsb" : : : "memory" );
+#endif
 }
 
 static inline void _ARM_Instruction_synchronization_barrier( void )
 {
+#ifdef ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS
   __asm__ volatile ( "isb" : : : "memory" );
+#endif
 }
 
 static inline uint32_t arm_interrupt_disable( void )