1 files changed, 60 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.S b/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.S
new file mode 100644
index 0000000000..e82cadf369
--- /dev/null
+++ b/Core/UefiCpuPkg/CpuDxe/X64/CpuAsm.S
@@ -0,0 +1,60 @@
+#      TITLE   CpuAsm.S: 
+
+#------------------------------------------------------------------------------
+#*
+#*   Copyright (c) 2008 - 2013, 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.S
+#*
+#*   Abstract:
+#*
+#------------------------------------------------------------------------------
+
+
+#text  SEGMENT
+
+
+#------------------------------------------------------------------------------
+# VOID
+# SetCodeSelector (
+#   UINT16 Selector
+#   );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(SetCodeSelector)
+ASM_PFX(SetCodeSelector):
+    subq    $0x10, %rsp 
+    leaq    L_setCodeSelectorLongJump(%rip), %rax 
+    movq    %rax, (%rsp) 
+    movw    %cx, 4(%rsp)
+    .byte   0xFF, 0x2C, 0x24     # jmp (%rsp) note:fword jmp
+L_setCodeSelectorLongJump:
+    addq    $0x10, %rsp
+    ret
+
+#------------------------------------------------------------------------------
+# VOID
+# SetDataSelectors (
+#   UINT16 Selector
+#   );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(SetDataSelectors)
+ASM_PFX(SetDataSelectors):
+    movw    %cx, %ss
+    movw    %cx, %ds
+    movw    %cx, %es
+    movw    %cx, %fs
+    movw    %cx, %gs
+    ret
+
+#text  ENDS
+
+#END
+
+