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44 lines
1.0 KiB
44 lines
1.0 KiB
4 years ago
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/** @file
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Implementation of 64-bit swap bytes
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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/**
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Switches the endianess of a 64-bit integer.
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This function swaps the bytes in a 64-bit unsigned value to switch the value
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from little endian to big endian or vice versa. The byte swapped value is
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returned.
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@param Operand A 64-bit unsigned value.
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@return The byte swaped Operand.
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**/
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UINT64
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EFIAPI
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InternalMathSwapBytes64 (
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IN UINT64 Operand
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)
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{
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_asm {
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mov eax, dword ptr [Operand + 4]
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mov edx, dword ptr [Operand + 0]
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bswap eax
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bswap edx
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}
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}
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