1 files changed, 31 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/WriteTr.nasm b/MdePkg/Library/BaseLib/X64/WriteTr.nasm
new file mode 100644
index 000000000000..51918c4ea1cc
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/WriteTr.nasm
@@ -0,0 +1,31 @@
+;------------------------------------------------------------------------------ ;
+; Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   WriteTr.nasm
+;
+; Abstract:
+;
+;   Write TR register
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; AsmWriteTr (
+;   UINT16 Selector
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmWriteTr)
+ASM_PFX(AsmWriteTr):
+    mov     eax, ecx
+    ltr     ax
+    ret
+