EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/MultU64x32.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   MultU64x32.c
  16
  17 Abstract:
  18
  19
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 UINT64
  26 EFIAPI
  27 InternalMathMultU64x32 (
  28   IN      UINT64                    Multiplicand,
  29   IN      UINT32                    Multiplier
  30   )
  31 {
  32   _asm {
  33     mov     ecx, Multiplier
  34     mov     eax, ecx
  35     imul    ecx, dword ptr [Multiplicand + 4]  // overflow not detectable
  36     mul     dword ptr [Multiplicand + 0]
  37     add     edx, ecx
  38   }
  39 }
  40