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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 |
e2d9bfb2 | 5 | This program and the accompanying materials\r |
720d3c5f | 6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
2fc59a00 | 8 | http://opensource.org/licenses/bsd-license.php.\r |
720d3c5f | 9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | \r | |
16 | \r | |
17 | \r | |
18 | /**\r | |
19 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
20 | \r | |
21 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r | |
22 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
23 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
24 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
25 | \r | |
26 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
27 | operation.\r | |
2fc59a00 | 28 | @param CompareValue A 64-bit value used in a compare operation.\r |
29 | @param ExchangeValue A 64-bit value used in an exchange operation.\r | |
720d3c5f | 30 | \r |
31 | @return The original *Value before exchange.\r | |
32 | \r | |
33 | **/\r | |
34 | UINT64\r | |
35 | EFIAPI\r | |
36 | InternalSyncCompareExchange64 (\r | |
4cee954e | 37 | IN volatile UINT64 *Value,\r |
720d3c5f | 38 | IN UINT64 CompareValue,\r |
39 | IN UINT64 ExchangeValue\r | |
40 | )\r | |
41 | {\r | |
42 | _asm {\r | |
43 | mov esi, Value\r | |
44 | mov eax, dword ptr [CompareValue + 0]\r | |
45 | mov edx, dword ptr [CompareValue + 4]\r | |
46 | mov ebx, dword ptr [ExchangeValue + 0]\r | |
47 | mov ecx, dword ptr [ExchangeValue + 4]\r | |
48 | lock cmpxchg8b qword ptr [esi]\r | |
49 | }\r | |
50 | }\r |