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878ddf1f | 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) 2006, Intel Corporation \r | |
12 | All rights reserved. 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 | Module Name: UefiDevicePathLib.c\r | |
21 | \r | |
22 | **/\r | |
23 | \r | |
24 | /**\r | |
add13dc2 | 25 | Returns the size of a device path in bytes.\r |
878ddf1f | 26 | \r |
add13dc2 | 27 | This function returns the size, in bytes, of the device path data structure specified by\r |
28 | DevicePath including the end of device path node. If DevicePath is NULL, then 0 is returned.\r | |
29 | \r | |
30 | @param DevicePath A pointer to a device path data structure.\r | |
878ddf1f | 31 | \r |
32 | @return The size of a device path in bytes.\r | |
33 | \r | |
34 | **/\r | |
35 | UINTN\r | |
36 | EFIAPI\r | |
37 | GetDevicePathSize (\r | |
38 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
39 | )\r | |
40 | {\r | |
41 | CONST EFI_DEVICE_PATH_PROTOCOL *Start;\r | |
42 | \r | |
43 | if (DevicePath == NULL) {\r | |
44 | return 0;\r | |
45 | }\r | |
46 | \r | |
47 | //\r | |
48 | // Search for the end of the device path structure\r | |
49 | //\r | |
50 | Start = DevicePath;\r | |
51 | while (!EfiIsDevicePathEnd (DevicePath)) {\r | |
52 | DevicePath = EfiNextDevicePathNode (DevicePath);\r | |
53 | }\r | |
54 | \r | |
55 | //\r | |
56 | // Compute the size and add back in the size of the end device path structure\r | |
57 | //\r | |
58 | return ((UINTN) DevicePath - (UINTN) Start) + sizeof (EFI_DEVICE_PATH_PROTOCOL);\r | |
59 | }\r | |
60 | \r | |
61 | /**\r | |
add13dc2 | 62 | Creates a new device path by appending a second device path to a first device path.\r |
878ddf1f | 63 | \r |
add13dc2 | 64 | This function allocates space for a new copy of the device path specified by DevicePath. If\r |
65 | DevicePath is NULL, then NULL is returned. If the memory is successfully allocated, then the\r | |
66 | contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer\r | |
67 | is returned. Otherwise, NULL is returned. \r | |
68 | \r | |
69 | @param DevicePath A pointer to a device path data structure.\r | |
878ddf1f | 70 | \r |
add13dc2 | 71 | @return A pointer to the duplicated device path.\r |
878ddf1f | 72 | \r |
73 | **/\r | |
74 | EFI_DEVICE_PATH_PROTOCOL *\r | |
75 | EFIAPI\r | |
76 | DuplicateDevicePath (\r | |
add13dc2 | 77 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r |
878ddf1f | 78 | )\r |
79 | {\r | |
80 | EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;\r | |
81 | UINTN Size;\r | |
82 | \r | |
83 | //\r | |
84 | // Compute the size\r | |
85 | //\r | |
86 | Size = GetDevicePathSize (DevicePath);\r | |
87 | if (Size == 0) {\r | |
88 | return NULL;\r | |
89 | }\r | |
90 | \r | |
91 | //\r | |
92 | // Allocate space for duplicate device path\r | |
93 | //\r | |
94 | NewDevicePath = AllocateCopyPool (Size, DevicePath);\r | |
95 | \r | |
96 | return NewDevicePath;\r | |
97 | }\r | |
98 | \r | |
99 | /**\r | |
add13dc2 | 100 | Creates a new device path by appending a second device path to a first device path.\r |
878ddf1f | 101 | \r |
add13dc2 | 102 | This function creates a new device path by appending a copy of SecondDevicePath to a copy of\r |
103 | FirstDevicePath in a newly allocated buffer. Only the end-of-device-path device node from\r | |
104 | SecondDevicePath is retained. The newly created device path is returned. \r | |
105 | If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned. \r | |
106 | If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned. \r | |
107 | If both FirstDevicePath and SecondDevicePath are NULL, then NULL is returned. \r | |
108 | If there is not enough memory for the newly allocated buffer, then NULL is returned.\r | |
109 | The memory for the new device path is allocated from EFI boot services memory. It is the\r | |
110 | responsibility of the caller to free the memory allocated.\r | |
878ddf1f | 111 | \r |
add13dc2 | 112 | @param FirstDevicePath A pointer to a device path data structure.\r |
113 | @param SecondDevicePath A pointer to a device path data structure.\r | |
114 | \r | |
115 | @return A pointer to the new device path.\r | |
878ddf1f | 116 | \r |
117 | **/\r | |
118 | EFI_DEVICE_PATH_PROTOCOL *\r | |
119 | EFIAPI\r | |
120 | AppendDevicePath (\r | |
add13dc2 | 121 | IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL\r |
122 | IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL\r | |
878ddf1f | 123 | )\r |
124 | {\r | |
125 | UINTN Size;\r | |
126 | UINTN Size1;\r | |
127 | UINTN Size2;\r | |
128 | EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;\r | |
129 | EFI_DEVICE_PATH_PROTOCOL *DevicePath2;\r | |
130 | \r | |
131 | //\r | |
add13dc2 | 132 | // If there's only 1 path, just duplicate it.\r |
878ddf1f | 133 | //\r |
134 | if (FirstDevicePath == NULL) {\r | |
135 | return DuplicateDevicePath (SecondDevicePath);\r | |
136 | }\r | |
137 | \r | |
138 | if (SecondDevicePath == NULL) {\r | |
139 | return DuplicateDevicePath (FirstDevicePath);\r | |
140 | }\r | |
141 | \r | |
142 | //\r | |
143 | // Allocate space for the combined device path. It only has one end node of\r | |
add13dc2 | 144 | // length EFI_DEVICE_PATH_PROTOCOL.\r |
878ddf1f | 145 | //\r |
146 | Size1 = GetDevicePathSize (FirstDevicePath);\r | |
147 | Size2 = GetDevicePathSize (SecondDevicePath);\r | |
148 | Size = Size1 + Size2 - sizeof (EFI_DEVICE_PATH_PROTOCOL);\r | |
149 | \r | |
150 | NewDevicePath = AllocatePool (Size);\r | |
151 | \r | |
152 | if (NewDevicePath != NULL) {\r | |
153 | NewDevicePath = CopyMem (NewDevicePath, FirstDevicePath, Size1);\r | |
154 | //\r | |
add13dc2 | 155 | // Over write FirstDevicePath EndNode and do the copy\r |
878ddf1f | 156 | //\r |
add13dc2 | 157 | DevicePath2 = (EFI_DEVICE_PATH_PROTOCOL *) ((CHAR8 *) NewDevicePath +\r |
158 | (Size1 - sizeof (EFI_DEVICE_PATH_PROTOCOL)));\r | |
878ddf1f | 159 | CopyMem (DevicePath2, SecondDevicePath, Size2);\r |
160 | }\r | |
161 | \r | |
162 | return NewDevicePath;\r | |
163 | }\r | |
164 | \r | |
165 | /**\r | |
add13dc2 | 166 | Creates a new path by appending the device node to the device path.\r |
878ddf1f | 167 | \r |
add13dc2 | 168 | This function creates a new device path by appending a copy of the device node specified by\r |
169 | DevicePathNode to a copy of the device path specified by DevicePath in an allocated buffer.\r | |
170 | The end-of-device-path device node is moved after the end of the appended device node.\r | |
171 | If DevicePath is NULL, then NULL is returned.\r | |
172 | If DevicePathNode is NULL, then NULL is returned.\r | |
173 | If there is not enough memory to allocate space for the new device path, then NULL is returned. \r | |
174 | The memory is allocated from EFI boot services memory. It is the responsibility of the caller to\r | |
175 | free the memory allocated.\r | |
176 | \r | |
177 | @param DevicePath A pointer to a device path data structure.\r | |
178 | @param DevicePathNode A pointer to a single device path node.\r | |
878ddf1f | 179 | \r |
180 | @return A pointer to the new device path.\r | |
878ddf1f | 181 | \r |
182 | **/\r | |
183 | EFI_DEVICE_PATH_PROTOCOL *\r | |
184 | EFIAPI\r | |
185 | AppendDevicePathNode (\r | |
add13dc2 | 186 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r |
187 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL\r | |
878ddf1f | 188 | )\r |
189 | {\r | |
5f10fa01 | 190 | EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;\r |
878ddf1f | 191 | EFI_DEVICE_PATH_PROTOCOL *NextNode;\r |
192 | EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;\r | |
193 | UINTN NodeLength;\r | |
878ddf1f | 194 | \r |
add13dc2 | 195 | if (DevicePath == NULL || DevicePathNode == NULL) {\r |
196 | return NULL;\r | |
197 | }\r | |
878ddf1f | 198 | //\r |
199 | // Build a Node that has a terminator on it\r | |
200 | //\r | |
5f10fa01 | 201 | NodeLength = DevicePathNodeLength (DevicePathNode);\r |
878ddf1f | 202 | \r |
5f10fa01 | 203 | TempDevicePath = AllocatePool (NodeLength + sizeof (EFI_DEVICE_PATH_PROTOCOL));\r |
204 | if (TempDevicePath == NULL) {\r | |
205 | return NULL;\r | |
878ddf1f | 206 | }\r |
5f10fa01 | 207 | TempDevicePath = CopyMem (TempDevicePath, DevicePathNode, NodeLength);\r |
208 | //\r | |
209 | // Add and end device path node to convert Node to device path\r | |
210 | //\r | |
211 | NextNode = NextDevicePathNode (TempDevicePath);\r | |
212 | SetDevicePathEndNode (NextNode);\r | |
213 | //\r | |
214 | // Append device paths\r | |
215 | //\r | |
216 | NewDevicePath = AppendDevicePath (DevicePath, TempDevicePath);\r | |
217 | \r | |
218 | FreePool (TempDevicePath);\r | |
219 | \r | |
878ddf1f | 220 | return NewDevicePath;\r |
221 | }\r | |
222 | \r | |
223 | /**\r | |
add13dc2 | 224 | Creates a new device path by appending the specified device path instance to the specified device\r |
225 | path.\r | |
226 | \r | |
227 | This function creates a new device path by appending a copy of the device path instance specified\r | |
228 | by DevicePathInstance to a copy of the device path secified by DevicePath in a allocated buffer.\r | |
229 | The end-of-device-path device node is moved after the end of the appended device path instance\r | |
230 | and a new end-of-device-path-instance node is inserted between. \r | |
231 | If DevicePath is NULL, then a copy if DevicePathInstance is returned.\r | |
232 | If DevicePathInstance is NULL, then NULL is returned.\r | |
233 | If there is not enough memory to allocate space for the new device path, then NULL is returned. \r | |
234 | The memory is allocated from EFI boot services memory. It is the responsibility of the caller to\r | |
235 | free the memory allocated.\r | |
236 | \r | |
237 | @param DevicePath A pointer to a device path data structure.\r | |
238 | @param DevicePathInstance A pointer to a device path instance.\r | |
878ddf1f | 239 | \r |
240 | @return A pointer to the new device path.\r | |
878ddf1f | 241 | \r |
242 | **/\r | |
243 | EFI_DEVICE_PATH_PROTOCOL *\r | |
244 | EFIAPI\r | |
245 | AppendDevicePathInstance (\r | |
add13dc2 | 246 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL\r |
247 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL\r | |
878ddf1f | 248 | )\r |
249 | {\r | |
250 | EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;\r | |
add13dc2 | 251 | EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;\r |
878ddf1f | 252 | UINTN SrcSize;\r |
253 | UINTN InstanceSize;\r | |
254 | \r | |
add13dc2 | 255 | if (DevicePath == NULL) {\r |
256 | return DuplicateDevicePath (DevicePathInstance);\r | |
257 | }\r | |
258 | \r | |
259 | if (DevicePathInstance == NULL) {\r | |
260 | return NULL;\r | |
878ddf1f | 261 | }\r |
262 | \r | |
add13dc2 | 263 | SrcSize = GetDevicePathSize (DevicePath);\r |
264 | InstanceSize = GetDevicePathSize (DevicePathInstance);\r | |
878ddf1f | 265 | \r |
266 | NewDevicePath = AllocatePool (SrcSize + InstanceSize);\r | |
267 | if (NewDevicePath != NULL) {\r | |
268 | \r | |
add13dc2 | 269 | TempDevicePath = CopyMem (NewDevicePath, DevicePath, SrcSize);;\r |
878ddf1f | 270 | \r |
add13dc2 | 271 | while (!IsDevicePathEnd (TempDevicePath)) {\r |
272 | TempDevicePath = NextDevicePathNode (TempDevicePath);\r | |
878ddf1f | 273 | }\r |
274 | \r | |
add13dc2 | 275 | TempDevicePath->SubType = END_INSTANCE_DEVICE_PATH_SUBTYPE;\r |
276 | TempDevicePath = NextDevicePathNode (TempDevicePath);\r | |
277 | CopyMem (TempDevicePath, DevicePathInstance, InstanceSize);\r | |
878ddf1f | 278 | }\r |
279 | \r | |
280 | return NewDevicePath;\r | |
281 | }\r | |
282 | \r | |
283 | /**\r | |
add13dc2 | 284 | Creates a copy of the current device path instance and returns a pointer to the next device path\r |
285 | instance.\r | |
286 | \r | |
287 | This function creates a copy of the current device path instance. It also updates DevicePath to\r | |
288 | point to the next device path instance in the device path (or NULL if no more) and updates Size\r | |
289 | to hold the size of the device path instance copy.\r | |
290 | If DevicePath is NULL, then NULL is returned.\r | |
291 | If there is not enough memory to allocate space for the new device path, then NULL is returned. \r | |
292 | The memory is allocated from EFI boot services memory. It is the responsibility of the caller to\r | |
293 | free the memory allocated.\r | |
294 | If Size is NULL, then ASSERT().\r | |
295 | \r | |
296 | @param DevicePath On input, this holds the pointer to the current device path\r | |
297 | instance. On output, this holds the pointer to the next device\r | |
298 | path instance or NULL if there are no more device path\r | |
299 | instances in the device path pointer to a device path data\r | |
300 | structure.\r | |
301 | @param Size On output, this holds the size of the device path instance, in\r | |
302 | bytes or zero, if DevicePath is NULL.\r | |
878ddf1f | 303 | \r |
add13dc2 | 304 | @return A pointer to the current device path instance.\r |
878ddf1f | 305 | \r |
306 | **/\r | |
307 | EFI_DEVICE_PATH_PROTOCOL *\r | |
308 | EFIAPI\r | |
309 | GetNextDevicePathInstance (\r | |
add13dc2 | 310 | IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,\r |
311 | OUT UINTN *Size\r | |
878ddf1f | 312 | )\r |
313 | {\r | |
314 | EFI_DEVICE_PATH_PROTOCOL *DevPath;\r | |
315 | EFI_DEVICE_PATH_PROTOCOL *ReturnValue;\r | |
316 | UINT8 Temp;\r | |
317 | \r | |
878ddf1f | 318 | ASSERT (Size != NULL);\r |
add13dc2 | 319 | \r |
320 | if (DevicePath == NULL || *DevicePath == NULL) {\r | |
878ddf1f | 321 | *Size = 0;\r |
322 | return NULL;\r | |
323 | }\r | |
324 | \r | |
325 | //\r | |
326 | // Find the end of the device path instance\r | |
327 | //\r | |
328 | DevPath = *DevicePath;\r | |
329 | while (!IsDevicePathEndType (DevPath)) {\r | |
330 | DevPath = NextDevicePathNode (DevPath);\r | |
331 | }\r | |
332 | \r | |
333 | //\r | |
334 | // Compute the size of the device path instance\r | |
335 | //\r | |
336 | *Size = ((UINTN) DevPath - (UINTN) (*DevicePath)) + sizeof (EFI_DEVICE_PATH_PROTOCOL);\r | |
337 | \r | |
338 | //\r | |
339 | // Make a copy and return the device path instance\r | |
340 | //\r | |
341 | Temp = DevPath->SubType;\r | |
342 | DevPath->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;\r | |
343 | ReturnValue = DuplicateDevicePath (*DevicePath);\r | |
344 | DevPath->SubType = Temp;\r | |
345 | \r | |
346 | //\r | |
347 | // If DevPath is the end of an entire device path, then another instance\r | |
348 | // does not follow, so *DevicePath is set to NULL.\r | |
349 | //\r | |
350 | if (DevicePathSubType (DevPath) == END_ENTIRE_DEVICE_PATH_SUBTYPE) {\r | |
351 | *DevicePath = NULL;\r | |
352 | } else {\r | |
353 | *DevicePath = NextDevicePathNode (DevPath);\r | |
354 | }\r | |
355 | \r | |
356 | return ReturnValue;\r | |
357 | }\r | |
358 | \r | |
359 | /**\r | |
add13dc2 | 360 | Creates a copy of the current device path instance and returns a pointer to the next device path\r |
361 | instance.\r | |
362 | \r | |
363 | This function creates a new device node in a newly allocated buffer of size NodeLength and\r | |
364 | initializes the device path node header with NodeType and NodeSubType. The new device path node\r | |
365 | is returned.\r | |
366 | If NodeLength is smaller than a device path header, then NULL is returned. \r | |
367 | If there is not enough memory to allocate space for the new device path, then NULL is returned. \r | |
368 | The memory is allocated from EFI boot services memory. It is the responsibility of the caller to\r | |
369 | free the memory allocated.\r | |
370 | \r | |
371 | @param NodeType The device node type for the new device node.\r | |
372 | @param NodeSubType The device node sub-type for the new device node.\r | |
373 | @param NodeLength The length of the new device node.\r | |
374 | \r | |
375 | @return The new device path.\r | |
376 | \r | |
377 | **/\r | |
378 | EFI_DEVICE_PATH_PROTOCOL *\r | |
379 | EFIAPI\r | |
380 | CreateDeviceNode (\r | |
381 | IN UINT8 NodeType,\r | |
382 | IN UINT8 NodeSubType,\r | |
383 | IN UINT16 NodeLength\r | |
384 | )\r | |
385 | {\r | |
386 | EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r | |
387 | \r | |
388 | if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {\r | |
389 | //\r | |
390 | // NodeLength is less than the size of the header.\r | |
391 | //\r | |
392 | return NULL;\r | |
393 | }\r | |
394 | \r | |
395 | DevicePath = AllocatePool (NodeLength);\r | |
396 | if (DevicePath != NULL) {\r | |
397 | DevicePath->Type = NodeType;\r | |
398 | DevicePath->SubType = NodeSubType;\r | |
399 | }\r | |
400 | \r | |
401 | return DevicePath;\r | |
402 | }\r | |
403 | \r | |
404 | /**\r | |
405 | Determines if a device path is single or multi-instance.\r | |
406 | \r | |
407 | This function returns TRUE if the device path specified by DevicePath is multi-instance.\r | |
408 | Otherwise, FALSE is returned. If DevicePath is NULL, then FALSE is returned.\r | |
878ddf1f | 409 | \r |
add13dc2 | 410 | @param DevicePath A pointer to a device path data structure.\r |
878ddf1f | 411 | \r |
add13dc2 | 412 | @retval TRUE DevicePath is multi-instance.\r |
413 | @retval FALSE DevicePath is not multi-instance or DevicePath is NULL.\r | |
878ddf1f | 414 | \r |
415 | **/\r | |
416 | BOOLEAN\r | |
417 | EFIAPI\r | |
418 | IsDevicePathMultiInstance (\r | |
419 | IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
420 | )\r | |
421 | {\r | |
add13dc2 | 422 | CONST EFI_DEVICE_PATH_PROTOCOL *Node;\r |
878ddf1f | 423 | \r |
424 | if (DevicePath == NULL) {\r | |
425 | return FALSE;\r | |
426 | }\r | |
427 | \r | |
428 | Node = DevicePath;\r | |
429 | while (!EfiIsDevicePathEnd (Node)) {\r | |
430 | if (EfiIsDevicePathEndInstance (Node)) {\r | |
431 | return TRUE;\r | |
432 | }\r | |
433 | \r | |
434 | Node = EfiNextDevicePathNode (Node);\r | |
435 | }\r | |
436 | \r | |
437 | return FALSE;\r | |
438 | }\r | |
439 | \r | |
add13dc2 | 440 | \r |
878ddf1f | 441 | /**\r |
add13dc2 | 442 | Retrieves the device path protocol from a handle.\r |
878ddf1f | 443 | \r |
add13dc2 | 444 | This function returns the device path protocol from the handle specified by Handle. If Handle is\r |
445 | NULL or Handle does not contain a device path protocol, then NULL is returned.\r | |
446 | \r | |
447 | @param Handle The handle from which to retrieve the device path protocol.\r | |
878ddf1f | 448 | \r |
add13dc2 | 449 | @return The device path protocol from the handle specified by Handle.\r |
878ddf1f | 450 | \r |
451 | **/\r | |
452 | EFI_DEVICE_PATH_PROTOCOL *\r | |
453 | EFIAPI\r | |
454 | DevicePathFromHandle (\r | |
add13dc2 | 455 | IN EFI_HANDLE Handle\r |
878ddf1f | 456 | )\r |
457 | {\r | |
458 | EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r | |
459 | EFI_STATUS Status;\r | |
460 | \r | |
461 | Status = gBS->HandleProtocol (\r | |
462 | Handle,\r | |
463 | &gEfiDevicePathProtocolGuid,\r | |
464 | (VOID *) &DevicePath\r | |
465 | );\r | |
466 | if (EFI_ERROR (Status)) {\r | |
467 | DevicePath = NULL;\r | |
468 | }\r | |
469 | return DevicePath;\r | |
470 | }\r | |
471 | \r | |
472 | /**\r | |
add13dc2 | 473 | Allocates a device path for a file and appends it to an existing device path.\r |
878ddf1f | 474 | \r |
add13dc2 | 475 | If Device is a valid device handle that contains a device path protocol, then a device path for\r |
476 | the file specified by FileName is allocated and appended to the device path associated with the\r | |
477 | handle Device. The allocated device path is returned. If Device is NULL or Device is a handle\r | |
478 | that does not support the device path protocol, then a device path containing a single device\r | |
479 | path node for the file specified by FileName is allocated and returned.\r | |
480 | If FileName is NULL, then ASSERT().\r | |
878ddf1f | 481 | \r |
add13dc2 | 482 | @param Device A pointer to a device handle. This parameter is optional and\r |
483 | may be NULL.\r | |
484 | @param FileName A pointer to a Null-terminated Unicode string.\r | |
485 | \r | |
486 | @return The allocated device path.\r | |
878ddf1f | 487 | \r |
488 | **/\r | |
489 | EFI_DEVICE_PATH_PROTOCOL *\r | |
490 | EFIAPI\r | |
491 | FileDevicePath (\r | |
add13dc2 | 492 | IN EFI_HANDLE Device, OPTIONAL\r |
493 | IN CONST CHAR16 *FileName\r | |
878ddf1f | 494 | )\r |
495 | {\r | |
add13dc2 | 496 | UINTN Size;\r |
497 | FILEPATH_DEVICE_PATH *FilePath;\r | |
878ddf1f | 498 | EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r |
28c73f6e | 499 | EFI_DEVICE_PATH_PROTOCOL *FileDevicePath;\r |
add13dc2 | 500 | \r |
501 | DevicePath = NULL;\r | |
502 | \r | |
503 | Size = StrSize (FileName);\r | |
28c73f6e | 504 | FileDevicePath = AllocatePool (Size + SIZE_OF_FILEPATH_DEVICE_PATH + EFI_END_DEVICE_PATH_LENGTH);\r |
505 | if (FileDevicePath != NULL) {\r | |
506 | FilePath = (FILEPATH_DEVICE_PATH *) FileDevicePath;\r | |
507 | FilePath->Header.Type = MEDIA_DEVICE_PATH;\r | |
508 | FilePath->Header.SubType = MEDIA_FILEPATH_DP;\r | |
add13dc2 | 509 | CopyMem (&FilePath->PathName, FileName, Size);\r |
28c73f6e | 510 | SetDevicePathNodeLength (&FilePath->Header, Size + SIZE_OF_FILEPATH_DEVICE_PATH);\r |
511 | SetDevicePathEndNode (NextDevicePathNode (&FilePath->Header));\r | |
512 | \r | |
878ddf1f | 513 | if (Device != NULL) {\r |
514 | DevicePath = DevicePathFromHandle (Device);\r | |
515 | }\r | |
28c73f6e | 516 | \r |
517 | DevicePath = AppendDevicePath (DevicePath, FileDevicePath);\r | |
518 | FreePool (FileDevicePath);\r | |
878ddf1f | 519 | }\r |
add13dc2 | 520 | \r |
878ddf1f | 521 | return DevicePath;\r |
522 | }\r | |
523 | \r |