1 files changed, 51 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.c b/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.c
new file mode 100644
index 0000000000..8f6bdc7b85
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/MultU64x64.c
@@ -0,0 +1,51 @@
+/** @file
+  Calculate the product of a 64-bit integer and another 64-bit integer
+
+  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.
+
+**/
+
+
+
+
+/**
+  Multiplies a 64-bit unsigned integer by a 64-bit unsigned integer
+  and generates a 64-bit unsigned result.
+
+  This function multiplies the 64-bit unsigned value Multiplicand by the 64-bit
+  unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
+  bit unsigned result is returned.
+
+  @param  Multiplicand  A 64-bit unsigned value.
+  @param  Multiplier    A 64-bit unsigned value.
+
+  @return Multiplicand * Multiplier
+
+**/
+UINT64
+EFIAPI
+InternalMathMultU64x64 (
+  IN      UINT64                    Multiplicand,
+  IN      UINT64                    Multiplier
+  )
+{
+  _asm {
+    mov     ebx, dword ptr [Multiplicand + 0]
+    mov     edx, dword ptr [Multiplier + 0]
+    mov     ecx, ebx
+    mov     eax, edx
+    imul    ebx, dword ptr [Multiplier + 4]
+    imul    edx, dword ptr [Multiplicand + 4]
+    add     ebx, edx
+    mul     ecx
+    add     edx, ebx
+  }
+}
+