Added to support X64 port (with SV5 ABI). May be able to remove after we port everything, but Sec, to EFI X64 ABI.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10683 6f19259b-4bc3-4df7-8a09-765794883524

UnixPkg/Library/UnixBaseLib/X86FxSave.c

@@ -0,0 +1,48 @@
+/** @file
+  IA-32/x64 AsmFxSave()
+
+  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"
+
+/**
+  Save the current floating point/SSE/SSE2 context to a buffer.
+
+  Saves the current floating point/SSE/SSE2 state to the buffer specified by
+  Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
+  available on IA-32 and x64.
+
+  If Buffer is NULL, then ASSERT().
+  If Buffer is not aligned on a 16-byte boundary, then ASSERT().
+
+  @param  Buffer  A pointer to a buffer to save the floating point/SSE/SSE2 context.
+
+**/
+VOID
+EFIAPI
+AsmFxSave (
+  OUT     IA32_FX_BUFFER            *Buffer
+  )
+{
+  ASSERT (Buffer != NULL);
+  ASSERT (0 == ((UINTN)Buffer & 0xf));
+
+  InternalX86FxSave (Buffer);
+
+  //
+  // Mark one flag at end of Buffer, it will be check by AsmFxRestor()
+  //
+  *(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
+}