projects / mirror_edk2.git / blame
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| 7dbc50bd YZ |
1 | /** @file\r |
| 2 | Device Path services. The thing to remember is device paths are built out of\r | |
| 3 | nodes. The device path is terminated by an end node that is length\r | |
| 4 | sizeof(EFI_DEVICE_PATH_PROTOCOL). That would be why there is sizeof(EFI_DEVICE_PATH_PROTOCOL)\r | |
| 5 | all over this file.\r | |
| 6 | \r | |
| 7 | The only place where multi-instance device paths are supported is in\r | |
| 8 | environment varibles. Multi-instance device paths should never be placed\r | |
| 9 | on a Handle.\r | |
| 10 | \r | |
| 11 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r | |
| 12 | This program and the accompanying materials\r | |
| 13 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 14 | which accompanies this distribution. The full text of the license may be found at\r | |
| 15 | http://opensource.org/licenses/bsd-license.php.\r | |
| 16 | \r | |
| 17 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 18 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 19 | \r | |
| 20 | **/\r | |
| 21 | \r | |
| 22 | \r | |
| 23 | #include "UefiDevicePathLib.h"\r | |
| 24 | \r | |
| 25 | /**\r | |
| 26 | Returns the size of a device path in bytes.\r | |
| 27 | \r | |
| 28 | This function returns the size, in bytes, of the device path data structure\r | |
| 29 | specified by DevicePath including the end of device path node.\r | |
| 30 | If DevicePath is NULL or invalid, then 0 is returned.\r | |
| 31 | \r | |
| 32 | @param DevicePath A pointer to a device path data structure.\r | |
| 33 | \r | |
| 34 | @retval 0 If DevicePath is NULL or invalid.\r | |
| 35 | @retval Others The size of a device path in bytes.\r | |
| 36 | \r | |
| 37 | **/\r | |
| 38 | UINTN\r | |
| 39 | GetDevicePathSize (\r | |
| 40 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
| 41 | )\r | |
| 42 | {\r | |
| 43 | return UefiDevicePathLibGetDevicePathSize (DevicePath);\r | |
| 44 | }\r | |
| 45 | \r | |
| 46 | /**\r | |
| 47 | Creates a new copy of an existing device path.\r | |
| 48 | \r | |
| 49 | This function allocates space for a new copy of the device path specified by DevicePath.\r | |
| 50 | If DevicePath is NULL, then NULL is returned. If the memory is successfully\r | |
| 51 | allocated, then the contents of DevicePath are copied to the newly allocated\r | |
| 52 | buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned.\r | |
| 53 | The memory for the new device path is allocated from EFI boot services memory.\r | |
| 54 | It is the responsibility of the caller to free the memory allocated.\r | |
| 55 | \r | |
| 56 | @param DevicePath A pointer to a device path data structure.\r | |
| 57 | \r | |
| 58 | @retval NULL DevicePath is NULL or invalid.\r | |
| 59 | @retval Others A pointer to the duplicated device path.\r | |
| 60 | \r | |
| 61 | **/\r | |
| 62 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 63 | DuplicateDevicePath (\r | |
| 64 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
| 65 | )\r | |
| 66 | {\r | |
| 67 | return UefiDevicePathLibDuplicateDevicePath (DevicePath);\r | |
| 68 | }\r | |
| 69 | \r | |
| 70 | /**\r | |
| 71 | Creates a new device path by appending a second device path to a first device path.\r | |
| 72 | \r | |
| 73 | This function creates a new device path by appending a copy of SecondDevicePath\r | |
| 74 | to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path\r | |
| 75 | device node from SecondDevicePath is retained. The newly created device path is\r | |
| 76 | returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of\r | |
| 77 | SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored,\r | |
| 78 | and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and\r | |
| 79 | SecondDevicePath are NULL, then a copy of an end-of-device-path is returned.\r | |
| 80 | \r | |
| 81 | If there is not enough memory for the newly allocated buffer, then NULL is returned.\r | |
| 82 | The memory for the new device path is allocated from EFI boot services memory.\r | |
| 83 | It is the responsibility of the caller to free the memory allocated.\r | |
| 84 | \r | |
| 85 | @param FirstDevicePath A pointer to a device path data structure.\r | |
| 86 | @param SecondDevicePath A pointer to a device path data structure.\r | |
| 87 | \r | |
| 88 | @retval NULL If there is not enough memory for the newly allocated buffer.\r | |
| 89 | @retval NULL If FirstDevicePath or SecondDevicePath is invalid.\r | |
| 90 | @retval Others A pointer to the new device path if success.\r | |
| 91 | Or a copy an end-of-device-path if both FirstDevicePath and SecondDevicePath are NULL.\r | |
| 92 | \r | |
| 93 | **/\r | |
| 94 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 95 | AppendDevicePath (\r | |
| 96 | CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL\r | |
| 97 | CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL\r | |
| 98 | )\r | |
| 99 | {\r | |
| 100 | return UefiDevicePathLibAppendDevicePath (FirstDevicePath, SecondDevicePath);\r | |
| 101 | }\r | |
| 102 | \r | |
| 103 | /**\r | |
| 104 | Creates a new path by appending the device node to the device path.\r | |
| 105 | \r | |
| 106 | This function creates a new device path by appending a copy of the device node\r | |
| 107 | specified by DevicePathNode to a copy of the device path specified by DevicePath\r | |
| 108 | in an allocated buffer. The end-of-device-path device node is moved after the\r | |
| 109 | end of the appended device node.\r | |
| 110 | If DevicePathNode is NULL then a copy of DevicePath is returned.\r | |
| 111 | If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device\r | |
| 112 | path device node is returned.\r | |
| 113 | If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path\r | |
| 114 | device node is returned.\r | |
| 115 | If there is not enough memory to allocate space for the new device path, then\r | |
| 116 | NULL is returned.\r | |
| 117 | The memory is allocated from EFI boot services memory. It is the responsibility\r | |
| 118 | of the caller to free the memory allocated.\r | |
| 119 | \r | |
| 120 | @param DevicePath A pointer to a device path data structure.\r | |
| 121 | @param DevicePathNode A pointer to a single device path node.\r | |
| 122 | \r | |
| 123 | @retval NULL If there is not enough memory for the new device path.\r | |
| 124 | @retval Others A pointer to the new device path if success.\r | |
| 125 | A copy of DevicePathNode followed by an end-of-device-path node\r | |
| 126 | if both FirstDevicePath and SecondDevicePath are NULL.\r | |
| 127 | A copy of an end-of-device-path node if both FirstDevicePath\r | |
| 128 | and SecondDevicePath are NULL.\r | |
| 129 | \r | |
| 130 | **/\r | |
| 131 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 132 | AppendDevicePathNode (\r | |
| 133 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r | |
| 134 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL\r | |
| 135 | )\r | |
| 136 | {\r | |
| 137 | return UefiDevicePathLibAppendDevicePathNode (DevicePath, DevicePathNode);\r | |
| 138 | }\r | |
| 139 | \r | |
| 140 | /**\r | |
| 141 | Creates a new device path by appending the specified device path instance to the specified device\r | |
| 142 | path.\r | |
| 143 | \r | |
| 144 | This function creates a new device path by appending a copy of the device path\r | |
| 145 | instance specified by DevicePathInstance to a copy of the device path specified\r | |
| 146 | by DevicePath in a allocated buffer.\r | |
| 147 | The end-of-device-path device node is moved after the end of the appended device\r | |
| 148 | path instance and a new end-of-device-path-instance node is inserted between.\r | |
| 149 | If DevicePath is NULL, then a copy if DevicePathInstance is returned.\r | |
| 150 | If DevicePathInstance is NULL, then NULL is returned.\r | |
| 151 | If DevicePath or DevicePathInstance is invalid, then NULL is returned.\r | |
| 152 | If there is not enough memory to allocate space for the new device path, then\r | |
| 153 | NULL is returned.\r | |
| 154 | The memory is allocated from EFI boot services memory. It is the responsibility\r | |
| 155 | of the caller to free the memory allocated.\r | |
| 156 | \r | |
| 157 | @param DevicePath A pointer to a device path data structure.\r | |
| 158 | @param DevicePathInstance A pointer to a device path instance.\r | |
| 159 | \r | |
| 160 | @return A pointer to the new device path.\r | |
| 161 | \r | |
| 162 | **/\r | |
| 163 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 164 | AppendDevicePathInstance (\r | |
| 165 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r | |
| 166 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL\r | |
| 167 | )\r | |
| 168 | {\r | |
| 169 | return UefiDevicePathLibAppendDevicePathInstance (DevicePath, DevicePathInstance);\r | |
| 170 | }\r | |
| 171 | \r | |
| 172 | /**\r | |
| 173 | Creates a copy of the current device path instance and returns a pointer to the next device path\r | |
| 174 | instance.\r | |
| 175 | \r | |
| 176 | This function creates a copy of the current device path instance. It also updates\r | |
| 177 | DevicePath to point to the next device path instance in the device path (or NULL\r | |
| 178 | if no more) and updates Size to hold the size of the device path instance copy.\r | |
| 179 | If DevicePath is NULL, then NULL is returned.\r | |
| 180 | If DevicePath points to a invalid device path, then NULL is returned.\r | |
| 181 | If there is not enough memory to allocate space for the new device path, then\r | |
| 182 | NULL is returned.\r | |
| 183 | The memory is allocated from EFI boot services memory. It is the responsibility\r | |
| 184 | of the caller to free the memory allocated.\r | |
| 185 | If Size is NULL, then ASSERT().\r | |
| 186 | \r | |
| 187 | @param DevicePath On input, this holds the pointer to the current\r | |
| 188 | device path instance. On output, this holds\r | |
| 189 | the pointer to the next device path instance\r | |
| 190 | or NULL if there are no more device path\r | |
| 191 | instances in the device path pointer to a\r | |
| 192 | device path data structure.\r | |
| 193 | @param Size On output, this holds the size of the device\r | |
| 194 | path instance, in bytes or zero, if DevicePath\r | |
| 195 | is NULL.\r | |
| 196 | \r | |
| 197 | @return A pointer to the current device path instance.\r | |
| 198 | \r | |
| 199 | **/\r | |
| 200 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 201 | GetNextDevicePathInstance (\r | |
| 202 | EFI_DEVICE_PATH_PROTOCOL **DevicePath,\r | |
| 203 | UINTN *Size\r | |
| 204 | )\r | |
| 205 | {\r | |
| 206 | return UefiDevicePathLibGetNextDevicePathInstance (DevicePath, Size);\r | |
| 207 | }\r | |
| 208 | \r | |
| 209 | /**\r | |
| 210 | Creates a device node.\r | |
| 211 | \r | |
| 212 | This function creates a new device node in a newly allocated buffer of size\r | |
| 213 | NodeLength and initializes the device path node header with NodeType and NodeSubType.\r | |
| 214 | The new device path node is returned.\r | |
| 215 | If NodeLength is smaller than a device path header, then NULL is returned.\r | |
| 216 | If there is not enough memory to allocate space for the new device path, then\r | |
| 217 | NULL is returned.\r | |
| 218 | The memory is allocated from EFI boot services memory. It is the responsibility\r | |
| 219 | of the caller to free the memory allocated.\r | |
| 220 | \r | |
| 221 | @param NodeType The device node type for the new device node.\r | |
| 222 | @param NodeSubType The device node sub-type for the new device node.\r | |
| 223 | @param NodeLength The length of the new device node.\r | |
| 224 | \r | |
| 225 | @return The new device path.\r | |
| 226 | \r | |
| 227 | **/\r | |
| 228 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 229 | CreateDeviceNode (\r | |
| 230 | UINT8 NodeType,\r | |
| 231 | UINT8 NodeSubType,\r | |
| 232 | UINT16 NodeLength\r | |
| 233 | )\r | |
| 234 | {\r | |
| 235 | return UefiDevicePathLibCreateDeviceNode (NodeType, NodeSubType, NodeLength);\r | |
| 236 | }\r | |
| 237 | \r | |
| 238 | /**\r | |
| 239 | Determines if a device path is single or multi-instance.\r | |
| 240 | \r | |
| 241 | This function returns TRUE if the device path specified by DevicePath is\r | |
| 242 | multi-instance.\r | |
| 243 | Otherwise, FALSE is returned.\r | |
| 244 | If DevicePath is NULL or invalid, then FALSE is returned.\r | |
| 245 | \r | |
| 246 | @param DevicePath A pointer to a device path data structure.\r | |
| 247 | \r | |
| 248 | @retval TRUE DevicePath is multi-instance.\r | |
| 249 | @retval FALSE DevicePath is not multi-instance, or DevicePath\r | |
| 250 | is NULL or invalid.\r | |
| 251 | \r | |
| 252 | **/\r | |
| 253 | BOOLEAN\r | |
| 254 | IsDevicePathMultiInstance (\r | |
| 255 | CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
| 256 | )\r | |
| 257 | {\r | |
| 258 | return UefiDevicePathLibIsDevicePathMultiInstance (DevicePath);\r | |
| 259 | }\r | |
| 260 | \r | |
| 261 | /**\r | |
| 262 | Convert text to the binary representation of a device node.\r | |
| 263 | \r | |
| 264 | @param TextDeviceNode TextDeviceNode points to the text representation of a device\r | |
| 265 | node. Conversion starts with the first character and continues\r | |
| 266 | until the first non-device node character.\r | |
| 267 | \r | |
| 268 | @return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was\r | |
| 269 | insufficient memory or text unsupported.\r | |
| 270 | \r | |
| 271 | **/\r | |
| 272 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 273 | ConvertTextToDeviceNode (\r | |
| 274 | CONST CHAR16 *TextDeviceNode\r | |
| 275 | )\r | |
| 276 | {\r | |
| 277 | return UefiDevicePathLibConvertTextToDeviceNode (TextDeviceNode);\r | |
| 278 | }\r | |
| 279 | \r | |
| 280 | /**\r | |
| 281 | Convert text to the binary representation of a device path.\r | |
| 282 | \r | |
| 283 | \r | |
| 284 | @param TextDevicePath TextDevicePath points to the text representation of a device\r | |
| 285 | path. Conversion starts with the first character and continues\r | |
| 286 | until the first non-device node character.\r | |
| 287 | \r | |
| 288 | @return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or\r | |
| 289 | there was insufficient memory.\r | |
| 290 | \r | |
| 291 | **/\r | |
| 292 | EFI_DEVICE_PATH_PROTOCOL *\r | |
| 293 | ConvertTextToDevicePath (\r | |
| 294 | CONST CHAR16 *TextDevicePath\r | |
| 295 | )\r | |
| 296 | {\r | |
| 297 | return UefiDevicePathLibConvertTextToDevicePath (TextDevicePath);\r | |
| 298 | }\r |