1 files changed, 64 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.c b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.c
new file mode 100644
index 0000000000..a102b0e684
--- /dev/null
+++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.c
@@ -0,0 +1,64 @@
+/*++
+
+Copyright (c) 2006, Intel Corporation                                                         
+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:
+
+   MultU64x32.c
+
+Abstract:
+
+  64-bit Multiplication function for IA-32
+
+--*/
+
+#include "Tiano.h"
+
+UINT64
+MultU64x32 (
+  IN UINT64   Multiplicand,
+  IN UINTN    Multiplier
+  )
+/*++
+
+Routine Description:
+
+  This routine allows a 64 bit value to be multiplied with a 32 bit 
+  value returns 64bit result.
+  No checking if the result is greater than 64bits
+
+Arguments:
+
+  Multiplicand  - multiplicand
+  Multiplier    - multiplier
+
+Returns:
+
+  Multiplicand * Multiplier
+
+--*/
+{
+  __asm {
+    mov    eax, dword ptr Multiplicand[0]
+    mul    Multiplier
+    push   eax
+    push   edx
+    mov    eax, dword ptr Multiplicand[4]
+    mul    Multiplier
+    ;
+    ; The value in edx stored by second multiplication overflows
+    ; the output and should be discarded. So here we overwrite it
+    ; with the edx value of first multiplication.
+    ;
+    pop    edx
+    add    edx, eax
+    pop    eax
+  }
+}