1 files changed, 36 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/X64/WriteMsr64.c b/roms/edk2/MdePkg/Library/BaseLib/X64/WriteMsr64.c
new file mode 100644
index 000000000..98c5458d8
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/X64/WriteMsr64.c
@@ -0,0 +1,36 @@
+/** @file
+  CpuBreakpoint function.
+
+  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+/**
+  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
+**/
+
+void __writemsr (unsigned long Register, unsigned __int64 Value);
+
+#pragma intrinsic(__writemsr)
+
+/**
+  Write data to MSR.
+
+  @param  Index                The register index of MSR.
+  @param  Value                Data wants to be written.
+
+  @return Value written to MSR.
+
+**/
+UINT64
+EFIAPI
+AsmWriteMsr64 (
+  IN UINT32  Index,
+  IN UINT64  Value
+  )
+{
+  __writemsr (Index, Value);
+  return Value;
+}
+