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e1f414b6 | 1 | /** @file\r |
2 | InterlockedCompareExchange64 function\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
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 | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
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 | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
42eedea9 | 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 | |
28 | @param CompareValue 64-bit value used in compare operation.\r | |
29 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
30 | \r | |
31 | @return The original *Value before exchange.\r | |
32 | \r | |
33 | **/\r | |
e1f414b6 | 34 | UINT64\r |
35 | EFIAPI\r | |
36 | InternalSyncCompareExchange64 (\r | |
37 | IN UINT64 *Value,\r | |
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 |