MdePkg/Library/BaseLib/Ia32/ModU64x32.c

   1 /** @file
   2   Calculate the remainder of a 64-bit integer by a 32-bit integer
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 /**
  10   Divides a 64-bit unsigned integer by a 32-bit unsigned integer and
  11   generates a 32-bit unsigned remainder.
  12
  13   This function divides the 64-bit unsigned value Dividend by the 32-bit
  14   unsigned value Divisor and generates a 32-bit remainder. This function
  15   returns the 32-bit unsigned remainder.
  16
  17   @param  Dividend  A 64-bit unsigned value.
  18   @param  Divisor   A 32-bit unsigned value.
  19
  20   @return Dividend % Divisor
  21
  22 **/
  23 UINT32
  24 EFIAPI
  25 InternalMathModU64x32 (
  26   IN      UINT64  Dividend,
  27   IN      UINT32  Divisor
  28   )
  29 {
  30   _asm {
  31     mov     eax, dword ptr [Dividend + 4]
  32     mov     ecx, Divisor
  33     xor     edx, edx
  34     div     ecx
  35     mov     eax, dword ptr [Dividend + 0]
  36     div     ecx
  37     mov     eax, edx
  38   }
  39 }