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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) 2013, 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 | GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_UTILITIES_PROTOCOL *mDevicePathLibDevicePathUtilities = NULL;\r | |
26 | GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *mDevicePathLibDevicePathToText = NULL;\r | |
27 | GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL *mDevicePathLibDevicePathFromText = NULL;\r | |
28 | \r | |
29 | /**\r | |
30 | The constructor function caches the pointer to DevicePathUtilites protocol,\r | |
31 | DevicePathToText protocol and DevicePathFromText protocol.\r | |
32 | \r | |
33 | The constructor function locates these three protocols from protocol database.\r | |
34 | It will caches the pointer to local protocol instance if that operation fails\r | |
35 | and it will always return EFI_SUCCESS. \r | |
36 | \r | |
37 | @param ImageHandle The firmware allocated handle for the EFI image.\r | |
38 | @param SystemTable A pointer to the EFI System Table.\r | |
39 | \r | |
40 | @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r | |
41 | \r | |
42 | **/\r | |
43 | EFI_STATUS\r | |
44 | EFIAPI\r | |
45 | UefiDevicePathLibOptionalDevicePathProtocolConstructor (\r | |
46 | IN EFI_HANDLE ImageHandle,\r | |
47 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
48 | )\r | |
49 | {\r | |
50 | EFI_STATUS Status;\r | |
51 | \r | |
52 | Status = gBS->LocateProtocol (\r | |
53 | &gEfiDevicePathUtilitiesProtocolGuid,\r | |
54 | NULL,\r | |
55 | (VOID**) &mDevicePathLibDevicePathUtilities\r | |
56 | );\r | |
57 | ASSERT_EFI_ERROR (Status);\r | |
58 | ASSERT (mDevicePathLibDevicePathUtilities != NULL);\r | |
59 | return Status;\r | |
60 | }\r | |
61 | \r | |
62 | /**\r | |
63 | Returns the size of a device path in bytes.\r | |
64 | \r | |
65 | This function returns the size, in bytes, of the device path data structure \r | |
66 | specified by DevicePath including the end of device path node.\r | |
67 | If DevicePath is NULL or invalid, then 0 is returned.\r | |
68 | \r | |
69 | @param DevicePath A pointer to a device path data structure.\r | |
70 | \r | |
71 | @retval 0 If DevicePath is NULL or invalid.\r | |
72 | @retval Others The size of a device path in bytes.\r | |
73 | \r | |
74 | **/\r | |
75 | UINTN\r | |
76 | EFIAPI\r | |
77 | GetDevicePathSize (\r | |
78 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
79 | )\r | |
80 | {\r | |
81 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
82 | return mDevicePathLibDevicePathUtilities->GetDevicePathSize (DevicePath);\r | |
83 | } else {\r | |
84 | return UefiDevicePathLibGetDevicePathSize (DevicePath);\r | |
85 | }\r | |
86 | }\r | |
87 | \r | |
88 | /**\r | |
89 | Creates a new copy of an existing device path.\r | |
90 | \r | |
91 | This function allocates space for a new copy of the device path specified by DevicePath. \r | |
92 | If DevicePath is NULL, then NULL is returned. If the memory is successfully \r | |
93 | allocated, then the contents of DevicePath are copied to the newly allocated \r | |
94 | buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned. \r | |
95 | The memory for the new device path is allocated from EFI boot services memory. \r | |
96 | It is the responsibility of the caller to free the memory allocated. \r | |
97 | \r | |
98 | @param DevicePath A pointer to a device path data structure.\r | |
99 | \r | |
100 | @retval NULL DevicePath is NULL or invalid.\r | |
101 | @retval Others A pointer to the duplicated device path.\r | |
102 | \r | |
103 | **/\r | |
104 | EFI_DEVICE_PATH_PROTOCOL *\r | |
105 | EFIAPI\r | |
106 | DuplicateDevicePath (\r | |
107 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
108 | )\r | |
109 | {\r | |
110 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
111 | return mDevicePathLibDevicePathUtilities->DuplicateDevicePath (DevicePath);\r | |
112 | } else {\r | |
113 | return UefiDevicePathLibDuplicateDevicePath (DevicePath);\r | |
114 | }\r | |
115 | }\r | |
116 | \r | |
117 | /**\r | |
118 | Creates a new device path by appending a second device path to a first device path.\r | |
119 | \r | |
120 | This function creates a new device path by appending a copy of SecondDevicePath \r | |
121 | to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path \r | |
122 | device node from SecondDevicePath is retained. The newly created device path is \r | |
123 | returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of \r | |
124 | SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored, \r | |
125 | and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and \r | |
126 | SecondDevicePath are NULL, then a copy of an end-of-device-path is returned. \r | |
127 | \r | |
128 | If there is not enough memory for the newly allocated buffer, then NULL is returned.\r | |
129 | The memory for the new device path is allocated from EFI boot services memory. \r | |
130 | It is the responsibility of the caller to free the memory allocated.\r | |
131 | \r | |
132 | @param FirstDevicePath A pointer to a device path data structure.\r | |
133 | @param SecondDevicePath A pointer to a device path data structure.\r | |
134 | \r | |
135 | @retval NULL If there is not enough memory for the newly allocated buffer.\r | |
136 | @retval NULL If FirstDevicePath or SecondDevicePath is invalid.\r | |
137 | @retval Others A pointer to the new device path if success.\r | |
138 | Or a copy an end-of-device-path if both FirstDevicePath and SecondDevicePath are NULL.\r | |
139 | \r | |
140 | **/\r | |
141 | EFI_DEVICE_PATH_PROTOCOL *\r | |
142 | EFIAPI\r | |
143 | AppendDevicePath (\r | |
144 | IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL\r | |
145 | IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL\r | |
146 | )\r | |
147 | {\r | |
148 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
149 | return mDevicePathLibDevicePathUtilities->AppendDevicePath (FirstDevicePath, SecondDevicePath);\r | |
150 | } else {\r | |
151 | return UefiDevicePathLibAppendDevicePath (FirstDevicePath, SecondDevicePath);\r | |
152 | }\r | |
153 | }\r | |
154 | \r | |
155 | /**\r | |
156 | Creates a new path by appending the device node to the device path.\r | |
157 | \r | |
158 | This function creates a new device path by appending a copy of the device node \r | |
159 | specified by DevicePathNode to a copy of the device path specified by DevicePath \r | |
160 | in an allocated buffer. The end-of-device-path device node is moved after the \r | |
161 | end of the appended device node.\r | |
162 | If DevicePathNode is NULL then a copy of DevicePath is returned.\r | |
163 | If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device \r | |
164 | path device node is returned.\r | |
165 | If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path \r | |
166 | device node is returned.\r | |
167 | If there is not enough memory to allocate space for the new device path, then \r | |
168 | NULL is returned. \r | |
169 | The memory is allocated from EFI boot services memory. It is the responsibility \r | |
170 | of the caller to free the memory allocated.\r | |
171 | \r | |
172 | @param DevicePath A pointer to a device path data structure.\r | |
173 | @param DevicePathNode A pointer to a single device path node.\r | |
174 | \r | |
175 | @retval NULL If there is not enough memory for the new device path.\r | |
176 | @retval Others A pointer to the new device path if success.\r | |
177 | A copy of DevicePathNode followed by an end-of-device-path node \r | |
178 | if both FirstDevicePath and SecondDevicePath are NULL.\r | |
179 | A copy of an end-of-device-path node if both FirstDevicePath \r | |
180 | and SecondDevicePath are NULL.\r | |
181 | \r | |
182 | **/\r | |
183 | EFI_DEVICE_PATH_PROTOCOL *\r | |
184 | EFIAPI\r | |
185 | AppendDevicePathNode (\r | |
186 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r | |
187 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL\r | |
188 | )\r | |
189 | {\r | |
190 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
191 | return mDevicePathLibDevicePathUtilities->AppendDeviceNode (DevicePath, DevicePathNode);\r | |
192 | } else {\r | |
193 | return UefiDevicePathLibAppendDevicePathNode (DevicePath, DevicePathNode);\r | |
194 | }\r | |
195 | }\r | |
196 | \r | |
197 | /**\r | |
198 | Creates a new device path by appending the specified device path instance to the specified device\r | |
199 | path.\r | |
200 | \r | |
201 | This function creates a new device path by appending a copy of the device path \r | |
202 | instance specified by DevicePathInstance to a copy of the device path specified \r | |
203 | by DevicePath in a allocated buffer.\r | |
204 | The end-of-device-path device node is moved after the end of the appended device \r | |
205 | path instance and a new end-of-device-path-instance node is inserted between. \r | |
206 | If DevicePath is NULL, then a copy if DevicePathInstance is returned.\r | |
207 | If DevicePathInstance is NULL, then NULL is returned.\r | |
208 | If DevicePath or DevicePathInstance is invalid, then NULL is returned.\r | |
209 | If there is not enough memory to allocate space for the new device path, then \r | |
210 | NULL is returned. \r | |
211 | The memory is allocated from EFI boot services memory. It is the responsibility \r | |
212 | of the caller to free the memory allocated.\r | |
213 | \r | |
214 | @param DevicePath A pointer to a device path data structure.\r | |
215 | @param DevicePathInstance A pointer to a device path instance.\r | |
216 | \r | |
217 | @return A pointer to the new device path.\r | |
218 | \r | |
219 | **/\r | |
220 | EFI_DEVICE_PATH_PROTOCOL *\r | |
221 | EFIAPI\r | |
222 | AppendDevicePathInstance (\r | |
223 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r | |
224 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL\r | |
225 | )\r | |
226 | {\r | |
227 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
228 | return mDevicePathLibDevicePathUtilities->AppendDevicePathInstance (DevicePath, DevicePathInstance);\r | |
229 | } else {\r | |
230 | return UefiDevicePathLibAppendDevicePathInstance (DevicePath, DevicePathInstance);\r | |
231 | }\r | |
232 | }\r | |
233 | \r | |
234 | /**\r | |
235 | Creates a copy of the current device path instance and returns a pointer to the next device path\r | |
236 | instance.\r | |
237 | \r | |
238 | This function creates a copy of the current device path instance. It also updates \r | |
239 | DevicePath to point to the next device path instance in the device path (or NULL \r | |
240 | if no more) and updates Size to hold the size of the device path instance copy.\r | |
241 | If DevicePath is NULL, then NULL is returned.\r | |
242 | If DevicePath points to a invalid device path, then NULL is returned.\r | |
243 | If there is not enough memory to allocate space for the new device path, then \r | |
244 | NULL is returned. \r | |
245 | The memory is allocated from EFI boot services memory. It is the responsibility \r | |
246 | of the caller to free the memory allocated.\r | |
247 | If Size is NULL, then ASSERT().\r | |
248 | \r | |
249 | @param DevicePath On input, this holds the pointer to the current \r | |
250 | device path instance. On output, this holds \r | |
251 | the pointer to the next device path instance \r | |
252 | or NULL if there are no more device path\r | |
253 | instances in the device path pointer to a \r | |
254 | device path data structure.\r | |
255 | @param Size On output, this holds the size of the device \r | |
256 | path instance, in bytes or zero, if DevicePath \r | |
257 | is NULL.\r | |
258 | \r | |
259 | @return A pointer to the current device path instance.\r | |
260 | \r | |
261 | **/\r | |
262 | EFI_DEVICE_PATH_PROTOCOL *\r | |
263 | EFIAPI\r | |
264 | GetNextDevicePathInstance (\r | |
265 | IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,\r | |
266 | OUT UINTN *Size\r | |
267 | )\r | |
268 | {\r | |
269 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
270 | return mDevicePathLibDevicePathUtilities->GetNextDevicePathInstance (DevicePath, Size);\r | |
271 | } else {\r | |
272 | return UefiDevicePathLibGetNextDevicePathInstance (DevicePath, Size);\r | |
273 | }\r | |
274 | }\r | |
275 | \r | |
276 | /**\r | |
277 | Creates a device node.\r | |
278 | \r | |
279 | This function creates a new device node in a newly allocated buffer of size \r | |
280 | NodeLength and initializes the device path node header with NodeType and NodeSubType. \r | |
281 | The new device path node is returned.\r | |
282 | If NodeLength is smaller than a device path header, then NULL is returned. \r | |
283 | If there is not enough memory to allocate space for the new device path, then \r | |
284 | NULL is returned. \r | |
285 | The memory is allocated from EFI boot services memory. It is the responsibility \r | |
286 | of the caller to free the memory allocated.\r | |
287 | \r | |
288 | @param NodeType The device node type for the new device node.\r | |
289 | @param NodeSubType The device node sub-type for the new device node.\r | |
290 | @param NodeLength The length of the new device node.\r | |
291 | \r | |
292 | @return The new device path.\r | |
293 | \r | |
294 | **/\r | |
295 | EFI_DEVICE_PATH_PROTOCOL *\r | |
296 | EFIAPI\r | |
297 | CreateDeviceNode (\r | |
298 | IN UINT8 NodeType,\r | |
299 | IN UINT8 NodeSubType,\r | |
300 | IN UINT16 NodeLength\r | |
301 | )\r | |
302 | {\r | |
303 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
304 | return mDevicePathLibDevicePathUtilities->CreateDeviceNode (NodeType, NodeSubType, NodeLength);\r | |
305 | } else {\r | |
306 | return UefiDevicePathLibCreateDeviceNode (NodeType, NodeSubType, NodeLength);\r | |
307 | }\r | |
308 | }\r | |
309 | \r | |
310 | /**\r | |
311 | Determines if a device path is single or multi-instance.\r | |
312 | \r | |
313 | This function returns TRUE if the device path specified by DevicePath is\r | |
314 | multi-instance.\r | |
315 | Otherwise, FALSE is returned.\r | |
316 | If DevicePath is NULL or invalid, then FALSE is returned.\r | |
317 | \r | |
318 | @param DevicePath A pointer to a device path data structure.\r | |
319 | \r | |
320 | @retval TRUE DevicePath is multi-instance.\r | |
321 | @retval FALSE DevicePath is not multi-instance, or DevicePath \r | |
322 | is NULL or invalid.\r | |
323 | \r | |
324 | **/\r | |
325 | BOOLEAN\r | |
326 | EFIAPI\r | |
327 | IsDevicePathMultiInstance (\r | |
328 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
329 | )\r | |
330 | {\r | |
331 | if (mDevicePathLibDevicePathUtilities != NULL) {\r | |
332 | return mDevicePathLibDevicePathUtilities->IsDevicePathMultiInstance (DevicePath);\r | |
333 | } else {\r | |
334 | return UefiDevicePathLibIsDevicePathMultiInstance (DevicePath);\r | |
335 | }\r | |
336 | }\r | |
337 | \r | |
338 | /**\r | |
339 | Locate and return the protocol instance identified by the ProtocolGuid.\r | |
340 | \r | |
341 | @param ProtocolGuid The GUID of the protocol.\r | |
342 | \r | |
343 | @return A pointer to the protocol instance or NULL when absent.\r | |
344 | **/\r | |
345 | VOID *\r | |
346 | UefiDevicePathLibLocateProtocol (\r | |
347 | EFI_GUID *ProtocolGuid\r | |
348 | )\r | |
349 | {\r | |
350 | EFI_STATUS Status;\r | |
351 | VOID *Protocol;\r | |
352 | Status = gBS->LocateProtocol (\r | |
353 | ProtocolGuid,\r | |
354 | NULL,\r | |
355 | (VOID**) &Protocol\r | |
356 | );\r | |
357 | if (EFI_ERROR (Status)) {\r | |
358 | return NULL;\r | |
359 | } else {\r | |
360 | return Protocol;\r | |
361 | }\r | |
362 | }\r | |
363 | \r | |
364 | /**\r | |
365 | Converts a device node to its string representation.\r | |
366 | \r | |
367 | @param DeviceNode A Pointer to the device node to be converted.\r | |
368 | @param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation\r | |
369 | of the display node is used, where applicable. If DisplayOnly\r | |
370 | is FALSE, then the longer text representation of the display node\r | |
371 | is used.\r | |
372 | @param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text\r | |
373 | representation for a device node can be used, where applicable.\r | |
374 | \r | |
375 | @return A pointer to the allocated text representation of the device node or NULL if DeviceNode\r | |
376 | is NULL or there was insufficient memory.\r | |
377 | \r | |
378 | **/\r | |
379 | CHAR16 *\r | |
380 | EFIAPI\r | |
381 | ConvertDeviceNodeToText (\r | |
382 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DeviceNode,\r | |
383 | IN BOOLEAN DisplayOnly,\r | |
384 | IN BOOLEAN AllowShortcuts\r | |
385 | )\r | |
386 | {\r | |
387 | if (mDevicePathLibDevicePathToText == NULL) {\r | |
388 | mDevicePathLibDevicePathToText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathToTextProtocolGuid);\r | |
389 | }\r | |
390 | if (mDevicePathLibDevicePathToText != NULL) {\r | |
391 | return mDevicePathLibDevicePathToText->ConvertDeviceNodeToText (DeviceNode, DisplayOnly, AllowShortcuts);\r | |
392 | }\r | |
393 | \r | |
394 | return UefiDevicePathLibConvertDeviceNodeToText (DeviceNode, DisplayOnly, AllowShortcuts);\r | |
395 | }\r | |
396 | \r | |
397 | /**\r | |
398 | Converts a device path to its text representation.\r | |
399 | \r | |
400 | @param DevicePath A Pointer to the device to be converted.\r | |
401 | @param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation\r | |
402 | of the display node is used, where applicable. If DisplayOnly\r | |
403 | is FALSE, then the longer text representation of the display node\r | |
404 | is used.\r | |
405 | @param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text\r | |
406 | representation for a device node can be used, where applicable.\r | |
407 | \r | |
408 | @return A pointer to the allocated text representation of the device path or\r | |
409 | NULL if DeviceNode is NULL or there was insufficient memory.\r | |
410 | \r | |
411 | **/\r | |
412 | CHAR16 *\r | |
413 | EFIAPI\r | |
414 | ConvertDevicePathToText (\r | |
415 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,\r | |
416 | IN BOOLEAN DisplayOnly,\r | |
417 | IN BOOLEAN AllowShortcuts\r | |
418 | )\r | |
419 | {\r | |
420 | if (mDevicePathLibDevicePathToText == NULL) {\r | |
421 | mDevicePathLibDevicePathToText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathToTextProtocolGuid);\r | |
422 | }\r | |
423 | if (mDevicePathLibDevicePathToText != NULL) {\r | |
424 | return mDevicePathLibDevicePathToText->ConvertDevicePathToText (DevicePath, DisplayOnly, AllowShortcuts);\r | |
425 | }\r | |
426 | \r | |
427 | return UefiDevicePathLibConvertDevicePathToText (DevicePath, DisplayOnly, AllowShortcuts);\r | |
428 | }\r | |
429 | \r | |
430 | /**\r | |
431 | Convert text to the binary representation of a device node.\r | |
432 | \r | |
433 | @param TextDeviceNode TextDeviceNode points to the text representation of a device\r | |
434 | node. Conversion starts with the first character and continues\r | |
435 | until the first non-device node character.\r | |
436 | \r | |
437 | @return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was\r | |
438 | insufficient memory or text unsupported.\r | |
439 | \r | |
440 | **/\r | |
441 | EFI_DEVICE_PATH_PROTOCOL *\r | |
442 | EFIAPI\r | |
443 | ConvertTextToDeviceNode (\r | |
444 | IN CONST CHAR16 *TextDeviceNode\r | |
445 | )\r | |
446 | {\r | |
447 | if (mDevicePathLibDevicePathFromText == NULL) {\r | |
448 | mDevicePathLibDevicePathFromText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathFromTextProtocolGuid);\r | |
449 | }\r | |
450 | if (mDevicePathLibDevicePathFromText != NULL) {\r | |
451 | return mDevicePathLibDevicePathFromText->ConvertTextToDeviceNode (TextDeviceNode);\r | |
452 | }\r | |
453 | \r | |
454 | return UefiDevicePathLibConvertTextToDeviceNode (TextDeviceNode);\r | |
455 | }\r | |
456 | \r | |
457 | /**\r | |
458 | Convert text to the binary representation of a device path.\r | |
459 | \r | |
460 | \r | |
461 | @param TextDevicePath TextDevicePath points to the text representation of a device\r | |
462 | path. Conversion starts with the first character and continues\r | |
463 | until the first non-device node character.\r | |
464 | \r | |
465 | @return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or\r | |
466 | there was insufficient memory.\r | |
467 | \r | |
468 | **/\r | |
469 | EFI_DEVICE_PATH_PROTOCOL *\r | |
470 | EFIAPI\r | |
471 | ConvertTextToDevicePath (\r | |
472 | IN CONST CHAR16 *TextDevicePath\r | |
473 | )\r | |
474 | {\r | |
475 | if (mDevicePathLibDevicePathFromText == NULL) {\r | |
476 | mDevicePathLibDevicePathFromText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathFromTextProtocolGuid);\r | |
477 | }\r | |
478 | if (mDevicePathLibDevicePathFromText != NULL) {\r | |
479 | return mDevicePathLibDevicePathFromText->ConvertTextToDevicePath (TextDevicePath);\r | |
480 | }\r | |
481 | \r | |
482 | return UefiDevicePathLibConvertTextToDevicePath (TextDevicePath);\r | |
483 | }\r | |
484 | \r |