projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| cc310428 OM |
1 | // Implementation of synchronization functions for ARM architecture (AArch64)\r |
| 2 | //\r | |
| 3 | // Copyright (c) 2012-2015, ARM Limited. All rights reserved.\r | |
| 4 | // Copyright (c) 2015, Linaro Limited. All rights reserved.\r | |
| 5 | //\r | |
| 9344f092 | 6 | // SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| cc310428 OM |
7 | //\r |
| 8 | //\r | |
| 9 | \r | |
| 10 | .text\r | |
| 11 | .align 3\r | |
| 12 | \r | |
| 9b89163e | 13 | GCC_ASM_EXPORT(InternalSyncCompareExchange16)\r |
| cc310428 OM |
14 | GCC_ASM_EXPORT(InternalSyncCompareExchange32)\r |
| 15 | GCC_ASM_EXPORT(InternalSyncCompareExchange64)\r | |
| 16 | GCC_ASM_EXPORT(InternalSyncIncrement)\r | |
| 17 | GCC_ASM_EXPORT(InternalSyncDecrement)\r | |
| 18 | \r | |
| 9b89163e AB |
19 | /**\r |
| 20 | Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r | |
| 21 | \r | |
| 22 | Performs an atomic compare exchange operation on the 16-bit unsigned integer\r | |
| 23 | specified by Value. If Value is equal to CompareValue, then Value is set to\r | |
| 24 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
| 25 | then Value is returned. The compare exchange operation must be performed using\r | |
| 26 | MP safe mechanisms.\r | |
| 27 | \r | |
| 28 | @param Value A pointer to the 16-bit value for the compare exchange\r | |
| 29 | operation.\r | |
| 30 | @param CompareValue 16-bit value used in compare operation.\r | |
| 31 | @param ExchangeValue 16-bit value used in exchange operation.\r | |
| 32 | \r | |
| 33 | @return The original *Value before exchange.\r | |
| 34 | \r | |
| 35 | **/\r | |
| 36 | //UINT16\r | |
| 37 | //EFIAPI\r | |
| 38 | //InternalSyncCompareExchange16 (\r | |
| 39 | // IN volatile UINT16 *Value,\r | |
| 40 | // IN UINT16 CompareValue,\r | |
| 41 | // IN UINT16 ExchangeValue\r | |
| 42 | // )\r | |
| 43 | ASM_PFX(InternalSyncCompareExchange16):\r | |
| 44 | uxth w1, w1\r | |
| 45 | uxth w2, w2\r | |
| 46 | dmb sy\r | |
| 47 | \r | |
| 48 | InternalSyncCompareExchange16Again:\r | |
| 49 | ldxrh w3, [x0]\r | |
| 50 | cmp w3, w1\r | |
| 51 | bne InternalSyncCompareExchange16Fail\r | |
| 52 | \r | |
| 53 | InternalSyncCompareExchange16Exchange:\r | |
| 54 | stxrh w4, w2, [x0]\r | |
| 55 | cbnz w4, InternalSyncCompareExchange16Again\r | |
| 56 | \r | |
| 57 | InternalSyncCompareExchange16Fail:\r | |
| 58 | dmb sy\r | |
| 59 | mov w0, w3\r | |
| 60 | ret\r | |
| 61 | \r | |
| cc310428 OM |
62 | /**\r |
| 63 | Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r | |
| 64 | \r | |
| 65 | Performs an atomic compare exchange operation on the 32-bit unsigned integer\r | |
| 66 | specified by Value. If Value is equal to CompareValue, then Value is set to\r | |
| 67 | ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r | |
| 68 | then Value is returned. The compare exchange operation must be performed using\r | |
| 69 | MP safe mechanisms.\r | |
| 70 | \r | |
| 71 | @param Value A pointer to the 32-bit value for the compare exchange\r | |
| 72 | operation.\r | |
| 73 | @param CompareValue 32-bit value used in compare operation.\r | |
| 74 | @param ExchangeValue 32-bit value used in exchange operation.\r | |
| 75 | \r | |
| 76 | @return The original *Value before exchange.\r | |
| 77 | \r | |
| 78 | **/\r | |
| 79 | //UINT32\r | |
| 80 | //EFIAPI\r | |
| 81 | //InternalSyncCompareExchange32 (\r | |
| 82 | // IN volatile UINT32 *Value,\r | |
| 83 | // IN UINT32 CompareValue,\r | |
| 84 | // IN UINT32 ExchangeValue\r | |
| 85 | // )\r | |
| 86 | ASM_PFX(InternalSyncCompareExchange32):\r | |
| 87 | dmb sy\r | |
| 88 | \r | |
| 89 | InternalSyncCompareExchange32Again:\r | |
| 90 | ldxr w3, [x0]\r | |
| 91 | cmp w3, w1\r | |
| 92 | bne InternalSyncCompareExchange32Fail\r | |
| 93 | \r | |
| 94 | InternalSyncCompareExchange32Exchange:\r | |
| 95 | stxr w4, w2, [x0]\r | |
| 96 | cbnz w4, InternalSyncCompareExchange32Again\r | |
| 97 | \r | |
| 98 | InternalSyncCompareExchange32Fail:\r | |
| 99 | dmb sy\r | |
| 100 | mov w0, w3\r | |
| 101 | ret\r | |
| 102 | \r | |
| 103 | /**\r | |
| 104 | Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r | |
| 105 | \r | |
| 106 | Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r | |
| 107 | by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r | |
| 108 | CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r | |
| 109 | The compare exchange operation must be performed using MP safe mechanisms.\r | |
| 110 | \r | |
| 111 | @param Value A pointer to the 64-bit value for the compare exchange\r | |
| 112 | operation.\r | |
| 113 | @param CompareValue 64-bit value used in compare operation.\r | |
| 114 | @param ExchangeValue 64-bit value used in exchange operation.\r | |
| 115 | \r | |
| 116 | @return The original *Value before exchange.\r | |
| 117 | \r | |
| 118 | **/\r | |
| 119 | //UINT64\r | |
| 120 | //EFIAPI\r | |
| 121 | //InternalSyncCompareExchange64 (\r | |
| 122 | // IN volatile UINT64 *Value,\r | |
| 123 | // IN UINT64 CompareValue,\r | |
| 124 | // IN UINT64 ExchangeValue\r | |
| 125 | // )\r | |
| 126 | ASM_PFX(InternalSyncCompareExchange64):\r | |
| 127 | dmb sy\r | |
| 128 | \r | |
| 129 | InternalSyncCompareExchange64Again:\r | |
| 130 | ldxr x3, [x0]\r | |
| 131 | cmp x3, x1\r | |
| 132 | bne InternalSyncCompareExchange64Fail\r | |
| 133 | \r | |
| 134 | InternalSyncCompareExchange64Exchange:\r | |
| 135 | stxr w4, x2, [x0]\r | |
| 136 | cbnz w4, InternalSyncCompareExchange64Again\r | |
| 137 | \r | |
| 138 | InternalSyncCompareExchange64Fail:\r | |
| 139 | dmb sy\r | |
| 140 | mov x0, x3\r | |
| 141 | ret\r | |
| 142 | \r | |
| 143 | /**\r | |
| 144 | Performs an atomic increment of an 32-bit unsigned integer.\r | |
| 145 | \r | |
| 146 | Performs an atomic increment of the 32-bit unsigned integer specified by\r | |
| 147 | Value and returns the incremented value. The increment operation must be\r | |
| 148 | performed using MP safe mechanisms. The state of the return value is not\r | |
| 149 | guaranteed to be MP safe.\r | |
| 150 | \r | |
| 151 | @param Value A pointer to the 32-bit value to increment.\r | |
| 152 | \r | |
| 153 | @return The incremented value.\r | |
| 154 | \r | |
| 155 | **/\r | |
| 156 | //UINT32\r | |
| 157 | //EFIAPI\r | |
| 158 | //InternalSyncIncrement (\r | |
| 159 | // IN volatile UINT32 *Value\r | |
| 160 | // )\r | |
| 161 | ASM_PFX(InternalSyncIncrement):\r | |
| 162 | dmb sy\r | |
| 163 | TryInternalSyncIncrement:\r | |
| 164 | ldxr w1, [x0]\r | |
| 165 | add w1, w1, #1\r | |
| 166 | stxr w2, w1, [x0]\r | |
| 167 | cbnz w2, TryInternalSyncIncrement\r | |
| 7fe51389 | 168 | mov w0, w1\r |
| cc310428 OM |
169 | dmb sy\r |
| 170 | ret\r | |
| 171 | \r | |
| 172 | /**\r | |
| 173 | Performs an atomic decrement of an 32-bit unsigned integer.\r | |
| 174 | \r | |
| 175 | Performs an atomic decrement of the 32-bit unsigned integer specified by\r | |
| 176 | Value and returns the decrement value. The decrement operation must be\r | |
| 177 | performed using MP safe mechanisms. The state of the return value is not\r | |
| 178 | guaranteed to be MP safe.\r | |
| 179 | \r | |
| 180 | @param Value A pointer to the 32-bit value to decrement.\r | |
| 181 | \r | |
| 182 | @return The decrement value.\r | |
| 183 | \r | |
| 184 | **/\r | |
| 185 | //UINT32\r | |
| 186 | //EFIAPI\r | |
| 187 | //InternalSyncDecrement (\r | |
| 188 | // IN volatile UINT32 *Value\r | |
| 189 | // )\r | |
| 190 | ASM_PFX(InternalSyncDecrement):\r | |
| 191 | dmb sy\r | |
| 192 | TryInternalSyncDecrement:\r | |
| 193 | ldxr w1, [x0]\r | |
| 194 | sub w1, w1, #1\r | |
| 195 | stxr w2, w1, [x0]\r | |
| 196 | cbnz w2, TryInternalSyncDecrement\r | |
| 7fe51389 | 197 | mov w0, w1\r |
| cc310428 OM |
198 | dmb sy\r |
| 199 | ret\r |