diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index 82f0c4b39c..7a0467130d 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -450,18 +450,6 @@ ArmMmuEnabled (
   VOID
   );
   
-VOID
-EFIAPI
-ArmSwitchProcessorMode (
-  IN ARM_PROCESSOR_MODE Mode
-  );
-
-ARM_PROCESSOR_MODE
-EFIAPI
-ArmProcessorMode (
-  VOID
-  );
-  
 VOID
 EFIAPI
 ArmEnableBranchPrediction (
diff --git a/ArmPkg/Library/ArmLib/Common/ArmLib.c b/ArmPkg/Library/ArmLib/Common/ArmLib.c
index a7b9551ba1..d70003ebb0 100644
--- a/ArmPkg/Library/ArmLib/Common/ArmLib.c
+++ b/ArmPkg/Library/ArmLib/Common/ArmLib.c
@@ -41,25 +41,6 @@ ArmCacheInformation (
   }
 }
 
-VOID
-EFIAPI
-ArmSwitchProcessorMode (
-  IN ARM_PROCESSOR_MODE Mode
-  )
-{
-  CPSRMaskInsert(ARM_PROCESSOR_MODE_MASK, Mode);
-}
-
-
-ARM_PROCESSOR_MODE
-EFIAPI
-ArmProcessorMode (
-  VOID
-  )
-{
-  return (ARM_PROCESSOR_MODE)(CPSRRead() & (UINT32)ARM_PROCESSOR_MODE_MASK);
-}
-
 VOID
 EFIAPI
 ArmSetAuxCrBit (