ArmPkg/ArmDmaLib: Fixed the calculation of the Base Address of the Buffer

[mirror_edk2.git] / ArmPkg / Library / ArmDmaLib / ArmDmaLib.c

diff --git a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
index 074e3c125549db07c363d0f784b52ec22a22afbe..e803304295ffb6aebe9f6245490f600b9b9e6ae0 100755 (executable)
--- a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
+++ b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
@@ -131,7 +131,7 @@ DmaMap (
 \r
     if ((Operation == MapOperationBusMasterRead) || (Operation == MapOperationBusMasterCommonBuffer)) {\r
       // In case the buffer is used for instance to send command to a PCI controller, we must ensure the memory is uncached\r
-      Status = gDS->SetMemorySpaceAttributes (ALIGN_VALUE(*DeviceAddress - BASE_4KB - 1,BASE_4KB), ALIGN_VALUE(*NumberOfBytes,BASE_4KB), EFI_MEMORY_WC);\r
+      Status = gDS->SetMemorySpaceAttributes (*DeviceAddress & ~(BASE_4KB - 1), ALIGN_VALUE (*NumberOfBytes, BASE_4KB), EFI_MEMORY_WC);\r
       ASSERT_EFI_ERROR (Status);\r
     }\r
   }\r