1 files changed, 74 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.asm b/EDK/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.asm
new file mode 100644
index 0000000..351020e
--- /dev/null
+++ b/EDK/Foundation/Library/EfiCommonLib/Ia32/MultU64x32.asm
@@ -0,0 +1,74 @@
+      TITLE   MultU64x32.asm: 64-bit Multiplication function for IA-32
+      
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2004, 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.asm
+; 
+; Abstract:
+; 
+;   64-bit Multiplication function for IA-32
+;
+;------------------------------------------------------------------------------
+
+  .686P
+  .XMM
+  .MODEL SMALL, C
+  .CODE
+
+MultU64x32 PROTO C  Multiplicand: QWORD, Multiplier: DWORD
+
+MultU64x32 PROC C   Multiplicand: QWORD, Multiplier: DWORD
+
+;------------------------------------------------------------------------------
+; 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
+;------------------------------------------------------------------------------
+
+  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
+  ret
+
+MultU64x32 ENDP
+
+END