1 files changed, 42 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/ReadMm4.c b/MdePkg/Library/BaseLib/Ia32/ReadMm4.c
new file mode 100644
index 0000000000000..ecc3896cfc076
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/ReadMm4.c
@@ -0,0 +1,42 @@
+/** @file
+  AsmReadMm4 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 value of 64-bit MMX Register #4 (MM4).
+
+  Reads and returns the current value of MM4. This function is only available
+  on IA-32 and x64.
+
+  @return The current value of MM4.
+
+**/
+UINT64
+EFIAPI
+AsmReadMm4 (
+  VOID
+  )
+{
+  _asm {
+    push    eax
+    push    eax
+    movq    [esp], mm4
+    pop     eax
+    pop     edx
+    emms
+  }
+}
+