MdePkg/Library/BaseLib/Ia32/SwapBytes64.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   CpuId.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   AsmCpuid function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ; UINT64
  22 ; EFIAPI
  23 ; InternalMathSwapBytes64 (
  24 ;   IN      UINT64                    Operand
  25 ;   );
  26 ;------------------------------------------------------------------------------
  27 global ASM_PFX(InternalMathSwapBytes64)
  28 ASM_PFX(InternalMathSwapBytes64):
  29     mov     eax, [esp + 8]              ; eax <- upper 32 bits
  30     mov     edx, [esp + 4]              ; edx <- lower 32 bits
  31     bswap   eax
  32     bswap   edx
  33     ret
  34