1 files changed, 37 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/ReadLdtr.c b/Core/MdePkg/Library/BaseLib/Ia32/ReadLdtr.c
new file mode 100644
index 0000000000..edb961fd55
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/ReadLdtr.c
@@ -0,0 +1,37 @@
+/** @file
+  AsmReadLdtr function
+
+  Copyright (c) 2006 - 2008, 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.
+
+**/
+
+
+
+
+/**
+  Reads the current Local Descriptor Table Register(LDTR) selector.
+
+  Reads and returns the current 16-bit LDTR descriptor value. This function is
+  only available on IA-32 and x64.
+
+  @return The current selector of LDT.
+
+**/
+UINT16
+EFIAPI
+AsmReadLdtr (
+  VOID
+  )
+{
+  _asm {
+    sldt    ax
+  }
+}
+