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720d3c5f | 1 | /** @file\r |
2 | InterlockedCompareExchange64 function\r | |
3 | \r | |
4cee954e | 4 | Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
720d3c5f | 6 | \r |
7 | **/\r | |
8 | \r | |
720d3c5f | 9 | /**\r |
10 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
11 | \r | |
12 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r | |
13 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
14 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
15 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
16 | \r | |
17 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
18 | operation.\r | |
2fc59a00 | 19 | @param CompareValue A 64-bit value used in a compare operation.\r |
20 | @param ExchangeValue A 64-bit value used in an exchange operation.\r | |
720d3c5f | 21 | \r |
22 | @return The original *Value before exchange.\r | |
23 | \r | |
24 | **/\r | |
25 | UINT64\r | |
26 | EFIAPI\r | |
27 | InternalSyncCompareExchange64 (\r | |
2f88bd3a MK |
28 | IN volatile UINT64 *Value,\r |
29 | IN UINT64 CompareValue,\r | |
30 | IN UINT64 ExchangeValue\r | |
720d3c5f | 31 | )\r |
32 | {\r | |
33 | _asm {\r | |
34 | mov esi, Value\r | |
35 | mov eax, dword ptr [CompareValue + 0]\r | |
36 | mov edx, dword ptr [CompareValue + 4]\r | |
37 | mov ebx, dword ptr [ExchangeValue + 0]\r | |
38 | mov ecx, dword ptr [ExchangeValue + 4]\r | |
39 | lock cmpxchg8b qword ptr [esi]\r | |
40 | }\r | |
41 | }\r |