[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / SwapBytes64.c

/** @file\r
  Implementation of 64-bit swap bytes\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
\r
\r
/**\r
  Switches the endianess of a 64-bit integer.\r
\r
  This function swaps the bytes in a 64-bit unsigned value to switch the value\r
  from little endian to big endian or vice versa. The byte swapped value is\r
  returned.\r
\r
  @param  Operand A 64-bit unsigned value.\r
\r
  @return The byte swaped Operand.\r
\r
**/\r
UINT64\r
EFIAPI\r
InternalMathSwapBytes64 (\r
  IN      UINT64                    Operand\r
  )\r
{\r
  _asm {\r
    mov     eax, dword ptr [Operand + 4]\r
    mov     edx, dword ptr [Operand + 0]\r
    bswap   eax\r
    bswap   edx\r
  }\r
}\r
\r
Commit	Line	Data
e1f414b6	1	/** @file\r
	2	Implementation of 64-bit swap bytes\r
	3	\r
bb817c56	4	Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
9344f092	5	SPDX-License-Identifier: BSD-2-Clause-Patent\r
e1f414b6	6	\r
	7	**/\r
	8	\r
1efcc4ae	9	\r
f734a10a	10	\r
e1f414b6	11	\r
42eedea9	12	/**\r
	13	Switches the endianess of a 64-bit integer.\r
	14	\r
	15	This function swaps the bytes in a 64-bit unsigned value to switch the value\r
	16	from little endian to big endian or vice versa. The byte swapped value is\r
	17	returned.\r
	18	\r
	19	@param Operand A 64-bit unsigned value.\r
	20	\r
	21	@return The byte swaped Operand.\r
	22	\r
	23	**/\r
e1f414b6	24	UINT64\r
	25	EFIAPI\r
	26	InternalMathSwapBytes64 (\r
	27	IN UINT64 Operand\r
	28	)\r
	29	{\r
	30	_asm {\r
	31	mov eax, dword ptr [Operand + 4]\r
	32	mov edx, dword ptr [Operand + 0]\r
	33	bswap eax\r
	34	bswap edx\r
	35	}\r
	36	}\r
	37	\r