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1 | /** @file\r | |
2 | Implementation of synchronization functions on EBC.\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | /**\r | |
10 | Performs an atomic compare exchange operation on a 16-bit\r | |
11 | unsigned integer.\r | |
12 | \r | |
13 | Performs an atomic compare exchange operation on the 16-bit\r | |
14 | unsigned integer specified by Value. If Value is equal to\r | |
15 | CompareValue, then Value is set to ExchangeValue and\r | |
16 | CompareValue is returned. If Value is not equal to\r | |
17 | CompareValue, then Value is returned. The compare exchange\r | |
18 | operation must be performed using MP safe mechanisms.\r | |
19 | \r | |
20 | @param Value A pointer to the 16-bit value for the\r | |
21 | compare exchange operation.\r | |
22 | @param CompareValue 16-bit value used in compare operation.\r | |
23 | @param ExchangeValue 16-bit value used in exchange operation.\r | |
24 | \r | |
25 | @return The original *Value before exchange.\r | |
26 | \r | |
27 | **/\r | |
28 | UINT16\r | |
29 | EFIAPI\r | |
30 | InternalSyncCompareExchange16 (\r | |
31 | IN volatile UINT16 *Value,\r | |
32 | IN UINT16 CompareValue,\r | |
33 | IN UINT16 ExchangeValue\r | |
34 | )\r | |
35 | {\r | |
36 | return *Value != CompareValue ? *Value :\r | |
37 | ((*Value = ExchangeValue), CompareValue);\r | |
38 | }\r | |
39 | \r | |
40 | /**\r | |
41 | Performs an atomic compare exchange operation on a 32-bit\r | |
42 | unsigned integer.\r | |
43 | \r | |
44 | Performs an atomic compare exchange operation on the 32-bit\r | |
45 | unsigned integer specified by Value. If Value is equal to\r | |
46 | CompareValue, then Value is set to ExchangeValue and\r | |
47 | CompareValue is returned. If Value is not equal to\r | |
48 | CompareValue, then Value is returned. The compare exchange\r | |
49 | operation must be performed using MP safe mechanisms.\r | |
50 | \r | |
51 | @param Value A pointer to the 32-bit value for the\r | |
52 | compare exchange operation.\r | |
53 | @param CompareValue 32-bit value used in compare operation.\r | |
54 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
55 | \r | |
56 | @return The original *Value before exchange.\r | |
57 | \r | |
58 | **/\r | |
59 | UINT32\r | |
60 | EFIAPI\r | |
61 | InternalSyncCompareExchange32 (\r | |
62 | IN volatile UINT32 *Value,\r | |
63 | IN UINT32 CompareValue,\r | |
64 | IN UINT32 ExchangeValue\r | |
65 | )\r | |
66 | {\r | |
67 | return *Value != CompareValue ? *Value :\r | |
68 | ((*Value = ExchangeValue), CompareValue);\r | |
69 | }\r | |
70 | \r | |
71 | /**\r | |
72 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
73 | \r | |
74 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r | |
75 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
76 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
77 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
78 | \r | |
79 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
80 | operation.\r | |
81 | @param CompareValue 64-bit value used in compare operation.\r | |
82 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
83 | \r | |
84 | @return The original *Value before exchange.\r | |
85 | \r | |
86 | **/\r | |
87 | UINT64\r | |
88 | EFIAPI\r | |
89 | InternalSyncCompareExchange64 (\r | |
90 | IN volatile UINT64 *Value,\r | |
91 | IN UINT64 CompareValue,\r | |
92 | IN UINT64 ExchangeValue\r | |
93 | )\r | |
94 | {\r | |
95 | return *Value != CompareValue ? *Value :\r | |
96 | ((*Value = ExchangeValue), CompareValue);\r | |
97 | }\r | |
98 | \r | |
99 | /**\r | |
100 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
101 | \r | |
102 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
103 | Value and returns the incremented value. The increment operation must be\r | |
104 | performed using MP safe mechanisms. The state of the return value is not\r | |
105 | guaranteed to be MP safe.\r | |
106 | \r | |
107 | @param Value A pointer to the 32-bit value to increment.\r | |
108 | \r | |
109 | @return The incremented value.\r | |
110 | \r | |
111 | **/\r | |
112 | UINT32\r | |
113 | EFIAPI\r | |
114 | InternalSyncIncrement (\r | |
115 | IN volatile UINT32 *Value\r | |
116 | )\r | |
117 | {\r | |
118 | return ++*Value;\r | |
119 | }\r | |
120 | \r | |
121 | /**\r | |
122 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
123 | \r | |
124 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
125 | Value and returns the decrement value. The decrement operation must be\r | |
126 | performed using MP safe mechanisms. The state of the return value is not\r | |
127 | guaranteed to be MP safe.\r | |
128 | \r | |
129 | @param Value A pointer to the 32-bit value to decrement.\r | |
130 | \r | |
131 | @return The decrement value.\r | |
132 | \r | |
133 | **/\r | |
134 | UINT32\r | |
135 | EFIAPI\r | |
136 | InternalSyncDecrement (\r | |
137 | IN volatile UINT32 *Value\r | |
138 | )\r | |
139 | {\r | |
140 | return --*Value;\r | |
141 | }\r |