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cf683fed | 1 | /** @file\r |
2 | GCC inline implementation of BaseSynchronizationLib processor specific functions.\r | |
9095d37b LG |
3 | \r |
4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
c9b34b8c | 6 | This program and the accompanying materials\r |
cf683fed | 7 | are licensed and made available under the terms and conditions of the BSD License\r |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
2fc59a00 | 9 | http://opensource.org/licenses/bsd-license.php.\r |
cf683fed | 10 | \r |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | \r | |
17 | \r | |
cf683fed | 18 | /**\r |
19 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
20 | \r | |
21 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
22 | Value and returns the incremented value. The increment operation must be\r | |
17634d02 | 23 | performed using MP safe mechanisms.\r |
cf683fed | 24 | \r |
25 | @param Value A pointer to the 32-bit value to increment.\r | |
26 | \r | |
27 | @return The incremented value.\r | |
28 | \r | |
29 | **/\r | |
30 | UINT32\r | |
31 | EFIAPI\r | |
32 | InternalSyncIncrement (\r | |
33 | IN volatile UINT32 *Value\r | |
34 | )\r | |
35 | {\r | |
36 | UINT32 Result;\r | |
37 | \r | |
38 | __asm__ __volatile__ (\r | |
17634d02 | 39 | "movl $1, %%eax \n\t"\r |
cf683fed | 40 | "lock \n\t"\r |
8a94eb92 | 41 | "xadd %%eax, %1 \n\t"\r |
310ddb63 | 42 | "inc %%eax \n\t"\r |
e6459b9e | 43 | : "=&a" (Result), // %0\r |
8a94eb92 LE |
44 | "+m" (*Value) // %1\r |
45 | : // no inputs that aren't also outputs\r | |
cf683fed | 46 | : "memory",\r |
47 | "cc"\r | |
48 | );\r | |
9095d37b LG |
49 | \r |
50 | return Result;\r | |
cf683fed | 51 | }\r |
52 | \r | |
53 | \r | |
54 | /**\r | |
55 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
56 | \r | |
57 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
58 | Value and returns the decremented value. The decrement operation must be\r | |
17634d02 | 59 | performed using MP safe mechanisms.\r |
cf683fed | 60 | \r |
61 | @param Value A pointer to the 32-bit value to decrement.\r | |
62 | \r | |
63 | @return The decremented value.\r | |
64 | \r | |
65 | **/\r | |
66 | UINT32\r | |
67 | EFIAPI\r | |
68 | InternalSyncDecrement (\r | |
69 | IN volatile UINT32 *Value\r | |
70 | )\r | |
71 | {\r | |
72 | UINT32 Result;\r | |
9095d37b | 73 | \r |
cf683fed | 74 | __asm__ __volatile__ (\r |
17634d02 RN |
75 | "movl $-1, %%eax \n\t"\r |
76 | "lock \n\t"\r | |
8a94eb92 | 77 | "xadd %%eax, %1 \n\t"\r |
310ddb63 | 78 | "dec %%eax \n\t"\r |
e6459b9e | 79 | : "=&a" (Result), // %0\r |
310ddb63 LE |
80 | "+m" (*Value) // %1\r |
81 | : // no inputs that aren't also outputs\r | |
cf683fed | 82 | : "memory",\r |
83 | "cc"\r | |
84 | );\r | |
9095d37b | 85 | \r |
cf683fed | 86 | return Result;\r |
87 | }\r | |
88 | \r | |
89 | \r | |
9b89163e AB |
90 | /**\r |
91 | Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r | |
92 | \r | |
93 | Performs an atomic compare exchange operation on the 16-bit unsigned integer\r | |
94 | specified by Value. If Value is equal to CompareValue, then Value is set to\r | |
95 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
96 | then Value is returned. The compare exchange operation must be performed using\r | |
97 | MP safe mechanisms.\r | |
98 | \r | |
99 | \r | |
100 | @param Value A pointer to the 16-bit value for the compare exchange\r | |
101 | operation.\r | |
102 | @param CompareValue 16-bit value used in compare operation.\r | |
103 | @param ExchangeValue 16-bit value used in exchange operation.\r | |
104 | \r | |
105 | @return The original *Value before exchange.\r | |
106 | \r | |
107 | **/\r | |
108 | UINT16\r | |
109 | EFIAPI\r | |
110 | InternalSyncCompareExchange16 (\r | |
111 | IN OUT volatile UINT16 *Value,\r | |
112 | IN UINT16 CompareValue,\r | |
113 | IN UINT16 ExchangeValue\r | |
114 | )\r | |
115 | {\r | |
9b89163e AB |
116 | __asm__ __volatile__ (\r |
117 | "lock \n\t"\r | |
c6fedbd7 LE |
118 | "cmpxchgw %2, %1 \n\t"\r |
119 | : "+a" (CompareValue), // %0\r | |
120 | "+m" (*Value) // %1\r | |
121 | : "r" (ExchangeValue) // %2\r | |
9b89163e AB |
122 | : "memory",\r |
123 | "cc"\r | |
124 | );\r | |
125 | \r | |
126 | return CompareValue;\r | |
127 | }\r | |
128 | \r | |
129 | \r | |
cf683fed | 130 | /**\r |
131 | Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r | |
132 | \r | |
133 | Performs an atomic compare exchange operation on the 32-bit unsigned integer\r | |
134 | specified by Value. If Value is equal to CompareValue, then Value is set to\r | |
135 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
136 | then Value is returned. The compare exchange operation must be performed using\r | |
137 | MP safe mechanisms.\r | |
138 | \r | |
139 | \r | |
140 | @param Value A pointer to the 32-bit value for the compare exchange\r | |
141 | operation.\r | |
142 | @param CompareValue 32-bit value used in compare operation.\r | |
143 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
144 | \r | |
145 | @return The original *Value before exchange.\r | |
146 | \r | |
147 | **/\r | |
148 | UINT32\r | |
149 | EFIAPI\r | |
150 | InternalSyncCompareExchange32 (\r | |
151 | IN OUT volatile UINT32 *Value,\r | |
152 | IN UINT32 CompareValue,\r | |
153 | IN UINT32 ExchangeValue\r | |
154 | )\r | |
155 | {\r | |
cf683fed | 156 | __asm__ __volatile__ (\r |
157 | "lock \n\t"\r | |
7149d409 LE |
158 | "cmpxchgl %2, %1 \n\t"\r |
159 | : "+a" (CompareValue), // %0\r | |
160 | "+m" (*Value) // %1\r | |
161 | : "r" (ExchangeValue) // %2\r | |
cf683fed | 162 | : "memory",\r |
163 | "cc"\r | |
164 | );\r | |
9095d37b | 165 | \r |
4e4a5f35 | 166 | return CompareValue;\r |
cf683fed | 167 | }\r |
168 | \r | |
169 | \r | |
170 | /**\r | |
171 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
172 | \r | |
173 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r | |
174 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
175 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
176 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
177 | \r | |
178 | \r | |
179 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
180 | operation.\r | |
181 | @param CompareValue 64-bit value used in compare operation.\r | |
182 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
183 | \r | |
184 | @return The original *Value before exchange.\r | |
185 | \r | |
186 | **/\r | |
187 | UINT64\r | |
188 | EFIAPI\r | |
189 | InternalSyncCompareExchange64 (\r | |
190 | IN OUT volatile UINT64 *Value,\r | |
191 | IN UINT64 CompareValue,\r | |
192 | IN UINT64 ExchangeValue\r | |
193 | )\r | |
194 | {\r | |
cf683fed | 195 | __asm__ __volatile__ (\r |
196 | "lock \n\t"\r | |
e5d4e750 LE |
197 | "cmpxchgq %2, %1 \n\t"\r |
198 | : "+a" (CompareValue), // %0\r | |
199 | "+m" (*Value) // %1\r | |
200 | : "r" (ExchangeValue) // %2\r | |
cf683fed | 201 | : "memory",\r |
202 | "cc"\r | |
203 | );\r | |
9095d37b | 204 | \r |
cf683fed | 205 | return CompareValue;\r |
cf683fed | 206 | }\r |