1 files changed, 41 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/WriteIdtr.c b/Core/MdePkg/Library/BaseLib/Ia32/WriteIdtr.c
new file mode 100644
index 0000000000..72005cccaa
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/WriteIdtr.c
@@ -0,0 +1,41 @@
+/** @file
+  AsmWriteIdtr function
+
+  Copyright (c) 2006 - 2010, 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.
+
+**/
+
+
+#include "BaseLibInternals.h"
+
+/**
+  Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
+
+  Writes the current IDTR descriptor and returns it in Idtr. This function is
+  only available on IA-32 and x64.
+
+  @param  Idtr  The pointer to a IDTR descriptor.
+
+**/
+VOID
+EFIAPI
+InternalX86WriteIdtr (
+  IN      CONST IA32_DESCRIPTOR     *Idtr
+  )
+{
+  _asm {
+    mov     eax, Idtr
+    pushfd
+    cli
+    lidt    fword ptr [eax]
+    popfd
+  }
+}
+