1 /** @file 2 Implementation of 64-bit swap bytes 3 4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 16 17 18 /** 19 Switches the endianess of a 64-bit integer. 20 21 This function swaps the bytes in a 64-bit unsigned value to switch the value 22 from little endian to big endian or vice versa. The byte swapped value is 23 returned. 24 25 @param Operand A 64-bit unsigned value. 26 27 @return The byte swaped Operand. 28 29 **/ 30 UINT64 31 EFIAPI 32 InternalMathSwapBytes64 ( 33 IN UINT64 Operand 34 ) 35 { 36 _asm { 37 mov eax, dword ptr [Operand + 4] 38 mov edx, dword ptr [Operand + 0] 39 bswap eax 40 bswap edx 41 } 42 } 43 44
