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720d3c5f | 1 | /** @file\r |
2 | Implementation of synchronization functions on EBC.\r | |
3 | \r | |
2fc59a00 | 4 | Copyright (c) 2006 - 2010, 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 | |
9b89163e AB |
15 | /**\r |
16 | Performs an atomic compare exchange operation on a 16-bit\r | |
17 | unsigned integer.\r | |
18 | \r | |
19 | Performs an atomic compare exchange operation on the 16-bit\r | |
20 | unsigned integer specified by Value. If Value is equal to\r | |
21 | CompareValue, then Value is set to ExchangeValue and\r | |
22 | CompareValue is returned. If Value is not equal to\r | |
23 | CompareValue, then Value is returned. The compare exchange\r | |
24 | operation must be performed using MP safe mechanisms.\r | |
25 | \r | |
26 | @param Value A pointer to the 16-bit value for the\r | |
27 | compare exchange operation.\r | |
28 | @param CompareValue 16-bit value used in compare operation.\r | |
29 | @param ExchangeValue 16-bit value used in exchange operation.\r | |
30 | \r | |
31 | @return The original *Value before exchange.\r | |
32 | \r | |
33 | **/\r | |
34 | UINT16\r | |
35 | EFIAPI\r | |
36 | InternalSyncCompareExchange16 (\r | |
37 | IN volatile UINT16 *Value,\r | |
38 | IN UINT16 CompareValue,\r | |
39 | IN UINT16 ExchangeValue\r | |
40 | )\r | |
41 | {\r | |
42 | return *Value != CompareValue ? *Value :\r | |
43 | ((*Value = ExchangeValue), CompareValue);\r | |
44 | }\r | |
45 | \r | |
720d3c5f | 46 | /**\r |
47 | Performs an atomic compare exchange operation on a 32-bit\r | |
48 | unsigned integer.\r | |
49 | \r | |
50 | Performs an atomic compare exchange operation on the 32-bit\r | |
51 | unsigned integer specified by Value. If Value is equal to\r | |
52 | CompareValue, then Value is set to ExchangeValue and\r | |
53 | CompareValue is returned. If Value is not equal to\r | |
54 | CompareValue, then Value is returned. The compare exchange\r | |
55 | operation must be performed using MP safe mechanisms.\r | |
56 | \r | |
57 | @param Value A pointer to the 32-bit value for the\r | |
58 | compare exchange operation.\r | |
59 | @param CompareValue 32-bit value used in compare operation.\r | |
60 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
61 | \r | |
62 | @return The original *Value before exchange.\r | |
63 | \r | |
64 | **/\r | |
65 | UINT32\r | |
66 | EFIAPI\r | |
67 | InternalSyncCompareExchange32 (\r | |
68 | IN volatile UINT32 *Value,\r | |
69 | IN UINT32 CompareValue,\r | |
70 | IN UINT32 ExchangeValue\r | |
71 | )\r | |
72 | {\r | |
73 | return *Value != CompareValue ? *Value :\r | |
74 | ((*Value = ExchangeValue), CompareValue);\r | |
75 | }\r | |
76 | \r | |
77 | /**\r | |
78 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
79 | \r | |
80 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified \r | |
81 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and \r | |
82 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. \r | |
83 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
84 | \r | |
85 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
86 | operation.\r | |
87 | @param CompareValue 64-bit value used in compare operation.\r | |
88 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
89 | \r | |
90 | @return The original *Value before exchange.\r | |
91 | \r | |
92 | **/\r | |
93 | UINT64\r | |
94 | EFIAPI\r | |
95 | InternalSyncCompareExchange64 (\r | |
96 | IN volatile UINT64 *Value,\r | |
97 | IN UINT64 CompareValue,\r | |
98 | IN UINT64 ExchangeValue\r | |
99 | )\r | |
100 | {\r | |
101 | return *Value != CompareValue ? *Value :\r | |
102 | ((*Value = ExchangeValue), CompareValue);\r | |
103 | }\r | |
104 | \r | |
105 | /**\r | |
106 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
107 | \r | |
108 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
109 | Value and returns the incremented value. The increment operation must be\r | |
110 | performed using MP safe mechanisms. The state of the return value is not\r | |
111 | guaranteed to be MP safe.\r | |
112 | \r | |
113 | @param Value A pointer to the 32-bit value to increment.\r | |
114 | \r | |
115 | @return The incremented value.\r | |
116 | \r | |
117 | **/\r | |
118 | UINT32\r | |
119 | EFIAPI\r | |
120 | InternalSyncIncrement (\r | |
121 | IN volatile UINT32 *Value\r | |
122 | )\r | |
123 | {\r | |
124 | return ++*Value;\r | |
125 | }\r | |
126 | \r | |
127 | /**\r | |
128 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
129 | \r | |
130 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
131 | Value and returns the decrement value. The decrement operation must be\r | |
132 | performed using MP safe mechanisms. The state of the return value is not\r | |
133 | guaranteed to be MP safe.\r | |
134 | \r | |
135 | @param Value A pointer to the 32-bit value to decrement.\r | |
136 | \r | |
137 | @return The decrement value.\r | |
138 | \r | |
139 | **/\r | |
140 | UINT32\r | |
141 | EFIAPI\r | |
142 | InternalSyncDecrement (\r | |
143 | IN volatile UINT32 *Value\r | |
144 | )\r | |
145 | {\r | |
146 | return --*Value;\r | |
147 | }\r |