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1 | /** @file\r |
2 | Implementation of synchronization functions on EBC.\r |
3 | \r |
4 | Copyright (c) 2006, 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 |
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13 | **/\r |
14 | \r |
15 | UINT32\r |
16 | EFIAPI\r |
17 | InternalSyncCompareExchange32 (\r |
18 | IN volatile UINT32 *Value,\r |
19 | IN UINT32 CompareValue,\r |
20 | IN UINT32 ExchangeValue\r |
21 | )\r |
22 | {\r |
23 | return *Value != CompareValue ? *Value :\r |
24 | ((*Value = ExchangeValue), CompareValue);\r |
25 | }\r |
26 | \r |
27 | /**\r |
28 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r |
29 | \r |
30 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified \r |
31 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and \r |
32 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. \r |
33 | The compare exchange operation must be performed using MP safe mechanisms.\r |
34 | \r |
35 | @param Value A pointer to the 64-bit value for the compare exchange\r |
36 | operation.\r |
37 | @param CompareValue 64-bit value used in compare operation.\r |
38 | @param ExchangeValue 64-bit value used in exchange operation.\r |
39 | \r |
40 | @return The original *Value before exchange.\r |
41 | \r |
42 | **/\r |
43 | UINT64\r |
44 | EFIAPI\r |
45 | InternalSyncCompareExchange64 (\r |
46 | IN volatile UINT64 *Value,\r |
47 | IN UINT64 CompareValue,\r |
48 | IN UINT64 ExchangeValue\r |
49 | )\r |
50 | {\r |
51 | return *Value != CompareValue ? *Value :\r |
52 | ((*Value = ExchangeValue), CompareValue);\r |
53 | }\r |
54 | \r |
55 | /**\r |
56 | Performs an atomic increment of an 32-bit unsigned integer.\r |
57 | \r |
58 | Performs an atomic increment of the 32-bit unsigned integer specified by\r |
59 | Value and returns the incremented value. The increment operation must be\r |
60 | performed using MP safe mechanisms. The state of the return value is not\r |
61 | guaranteed to be MP safe.\r |
62 | \r |
63 | @param Value A pointer to the 32-bit value to increment.\r |
64 | \r |
65 | @return The incremented value.\r |
66 | \r |
67 | **/\r |
68 | UINT32\r |
69 | EFIAPI\r |
70 | InternalSyncIncrement (\r |
71 | IN volatile UINT32 *Value\r |
72 | )\r |
73 | {\r |
74 | return ++*Value;\r |
75 | }\r |
76 | \r |
77 | /**\r |
78 | Performs an atomic decrement of an 32-bit unsigned integer.\r |
79 | \r |
80 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r |
81 | Value and returns the decrement value. The decrement operation must be\r |
82 | performed using MP safe mechanisms. The state of the return value is not\r |
83 | guaranteed to be MP safe.\r |
84 | \r |
85 | @param Value A pointer to the 32-bit value to decrement.\r |
86 | \r |
87 | @return The decrement value.\r |
88 | \r |
89 | **/\r |
90 | UINT32\r |
91 | EFIAPI\r |
92 | InternalSyncDecrement (\r |
93 | IN volatile UINT32 *Value\r |
94 | )\r |
95 | {\r |
96 | return --*Value;\r |
97 | }\r |