MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 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 ; Module Name:
  13 ;
  14 ;   CpuId.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   AsmCpuid function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .586
  25     .model  flat,C
  26     .code
  27
  28 ;------------------------------------------------------------------------------
  29 ; UINT64
  30 ; EFIAPI
  31 ; InternalMathSwapBytes64 (
  32 ;   IN      UINT64                    Operand
  33 ;   );
  34 ;------------------------------------------------------------------------------
  35 InternalMathSwapBytes64 PROC
  36     mov     eax, [esp + 8]              ; eax <- upper 32 bits
  37     mov     edx, [esp + 4]              ; edx <- lower 32 bits
  38     bswap   eax
  39     bswap   edx
  40     ret
  41 InternalMathSwapBytes64 ENDP
  42
  43     END