1 files changed, 52 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm b/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
new file mode 100644
index 0000000000..77ecfb3404
--- /dev/null
+++ b/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
@@ -0,0 +1,52 @@
+;------------------------------------------------------------------------------
+;*
+;*   Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+;*   This program and the accompanying materials
+;*   are licensed and made available under the terms and conditions of the BSD License
+;*   which accompanies this distribution.  The full text of the license may be found at
+;*   http://opensource.org/licenses/bsd-license.php
+;*
+;*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+;*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;*
+;*    CpuAsm.nasm
+;*
+;*   Abstract:
+;*
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; SetCodeSelector (
+;   UINT16 Selector
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(SetCodeSelector)
+ASM_PFX(SetCodeSelector):
+    sub     rsp, 0x10
+    lea     rax, [setCodeSelectorLongJump]
+    mov     [rsp], rax
+    mov     [rsp+4], cx
+    jmp     dword far [rsp]
+setCodeSelectorLongJump:
+    add     rsp, 0x10
+    ret
+
+;------------------------------------------------------------------------------
+; VOID
+; SetDataSelectors (
+;   UINT16 Selector
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(SetDataSelectors)
+ASM_PFX(SetDataSelectors):
+o16 mov     ss, cx
+o16 mov     ds, cx
+o16 mov     es, cx
+o16 mov     fs, cx
+o16 mov     gs, cx
+    ret
+