1. Updated function headers in all assembly files.

2. Split x86LowLevel.c into a bunch of C files to make images linked with BaseLib smaller.
3. Fixed a few minor bugs.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1066 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/x86WriteIdtr.c

@@ -0,0 +1,38 @@
+/** @file
+  IA-32/x64 AsmWriteIdtr()
+
+  Copyright (c) 2006, Intel Corporation<BR>
+  All rights reserved. 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.
+
+  Module Name:  x86WriteIdtr.c
+
+**/
+
+#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.
+
+  If Idtr is NULL, then ASSERT().
+
+  @param  Idtr  Pointer to a IDTR descriptor.
+
+**/
+VOID
+EFIAPI
+AsmWriteIdtr (
+  IN      CONST IA32_DESCRIPTOR     *Idtr
+  )
+{
+  ASSERT (Idtr != NULL);
+  InternalX86WriteIdtr (Idtr);
+}