1 files changed, 37 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/WriteMm4.c b/MdePkg/Library/BaseLib/Ia32/WriteMm4.c
new file mode 100644
index 000000000000..18228115a2c1
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/WriteMm4.c
@@ -0,0 +1,37 @@
+/** @file
+  AsmWriteMm4 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.
+
+**/
+
+
+
+
+/**
+  Writes the current value of 64-bit MMX Register #4 (MM4).
+
+  Writes the current value of MM4. This function is only available on IA32 and
+  x64.
+
+  @param  Value The 64-bit value to write to MM4.
+
+**/
+VOID
+EFIAPI
+AsmWriteMm4 (
+  IN UINT64   Value
+  )
+{
+  _asm {
+    movq    mm4, qword ptr [Value]
+    emms
+  }
+}