1 files changed, 40 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c
new file mode 100644
index 00000000..eef8783c
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c
@@ -0,0 +1,40 @@
+/** @file
+  InterlockedDecrement function
+
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+/**
+  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
+**/
+
+long _InterlockedDecrement(
+   long * lpAddend
+);
+
+#pragma intrinsic(_InterlockedDecrement)
+
+/**
+  Performs an atomic decrement of an 32-bit unsigned integer.
+
+  Performs an atomic decrement of the 32-bit unsigned integer specified by
+  Value and returns the decrement value. The decrement operation must be
+  performed using MP safe mechanisms. The state of the return value is not
+  guaranteed to be MP safe.
+
+  @param  Value A pointer to the 32-bit value to decrement.
+
+  @return The decrement value.
+
+**/
+UINT32
+EFIAPI
+InternalSyncDecrement (
+  IN      volatile UINT32           *Value
+  )
+{
+  return _InterlockedDecrement ((long *)(Value));
+}
+