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1 | /** @file\r |
2 | Utility routines used by boot maintenance modules.\r | |
3 | \r | |
afc244a5 | 4 | Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>\r |
143f0b1d ED |
5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "BootMaint.h"\r | |
16 | \r | |
17 | /**\r | |
18 | \r | |
19 | Find the first instance of this Protocol\r | |
20 | in the system and return it's interface.\r | |
21 | \r | |
22 | \r | |
23 | @param ProtocolGuid Provides the protocol to search for\r | |
24 | @param Interface On return, a pointer to the first interface\r | |
25 | that matches ProtocolGuid\r | |
26 | \r | |
27 | @retval EFI_SUCCESS A protocol instance matching ProtocolGuid was found\r | |
28 | @retval EFI_NOT_FOUND No protocol instances were found that match ProtocolGuid\r | |
29 | \r | |
30 | **/\r | |
31 | EFI_STATUS\r | |
32 | EfiLibLocateProtocol (\r | |
33 | IN EFI_GUID *ProtocolGuid,\r | |
34 | OUT VOID **Interface\r | |
35 | )\r | |
36 | {\r | |
37 | EFI_STATUS Status;\r | |
38 | \r | |
39 | Status = gBS->LocateProtocol (\r | |
40 | ProtocolGuid,\r | |
41 | NULL,\r | |
42 | (VOID **) Interface\r | |
43 | );\r | |
44 | return Status;\r | |
45 | }\r | |
46 | \r | |
47 | /**\r | |
48 | \r | |
49 | Function opens and returns a file handle to the root directory of a volume.\r | |
50 | \r | |
51 | @param DeviceHandle A handle for a device\r | |
52 | \r | |
53 | @return A valid file handle or NULL is returned\r | |
54 | \r | |
55 | **/\r | |
56 | EFI_FILE_HANDLE\r | |
57 | EfiLibOpenRoot (\r | |
58 | IN EFI_HANDLE DeviceHandle\r | |
59 | )\r | |
60 | {\r | |
61 | EFI_STATUS Status;\r | |
62 | EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;\r | |
63 | EFI_FILE_HANDLE File;\r | |
64 | \r | |
65 | File = NULL;\r | |
66 | \r | |
67 | //\r | |
68 | // File the file system interface to the device\r | |
69 | //\r | |
70 | Status = gBS->HandleProtocol (\r | |
71 | DeviceHandle,\r | |
72 | &gEfiSimpleFileSystemProtocolGuid,\r | |
73 | (VOID *) &Volume\r | |
74 | );\r | |
75 | \r | |
76 | //\r | |
77 | // Open the root directory of the volume\r | |
78 | //\r | |
79 | if (!EFI_ERROR (Status)) {\r | |
80 | Status = Volume->OpenVolume (\r | |
81 | Volume,\r | |
82 | &File\r | |
83 | );\r | |
84 | }\r | |
85 | //\r | |
86 | // Done\r | |
87 | //\r | |
88 | return EFI_ERROR (Status) ? NULL : File;\r | |
89 | }\r | |
90 | \r | |
91 | /**\r | |
92 | \r | |
93 | Helper function called as part of the code needed\r | |
94 | to allocate the proper sized buffer for various\r | |
95 | EFI interfaces.\r | |
96 | \r | |
97 | \r | |
98 | @param Status Current status\r | |
99 | @param Buffer Current allocated buffer, or NULL\r | |
100 | @param BufferSize Current buffer size needed\r | |
101 | \r | |
102 | @retval TRUE if the buffer was reallocated and the caller\r | |
103 | should try the API again.\r | |
104 | @retval FALSE The caller should not call this function again.\r | |
105 | \r | |
106 | **/\r | |
107 | BOOLEAN\r | |
108 | EfiGrowBuffer (\r | |
109 | IN OUT EFI_STATUS *Status,\r | |
110 | IN OUT VOID **Buffer,\r | |
111 | IN UINTN BufferSize\r | |
112 | )\r | |
113 | {\r | |
114 | BOOLEAN TryAgain;\r | |
115 | \r | |
116 | //\r | |
117 | // If this is an initial request, buffer will be null with a new buffer size\r | |
118 | //\r | |
119 | if ((*Buffer == NULL) && (BufferSize != 0)) {\r | |
120 | *Status = EFI_BUFFER_TOO_SMALL;\r | |
121 | }\r | |
122 | //\r | |
123 | // If the status code is "buffer too small", resize the buffer\r | |
124 | //\r | |
125 | TryAgain = FALSE;\r | |
126 | if (*Status == EFI_BUFFER_TOO_SMALL) {\r | |
127 | \r | |
128 | if (*Buffer != NULL) {\r | |
129 | FreePool (*Buffer);\r | |
130 | }\r | |
131 | \r | |
132 | *Buffer = AllocateZeroPool (BufferSize);\r | |
133 | \r | |
134 | if (*Buffer != NULL) {\r | |
135 | TryAgain = TRUE;\r | |
136 | } else {\r | |
137 | *Status = EFI_OUT_OF_RESOURCES;\r | |
138 | }\r | |
139 | }\r | |
140 | //\r | |
141 | // If there's an error, free the buffer\r | |
142 | //\r | |
143 | if (!TryAgain && EFI_ERROR (*Status) && (*Buffer != NULL)) {\r | |
144 | FreePool (*Buffer);\r | |
145 | *Buffer = NULL;\r | |
146 | }\r | |
147 | \r | |
148 | return TryAgain;\r | |
149 | }\r | |
150 | \r | |
151 | \r | |
152 | /**\r | |
153 | Function deletes the variable specified by VarName and VarGuid.\r | |
154 | \r | |
155 | @param VarName A Null-terminated Unicode string that is\r | |
156 | the name of the vendor's variable.\r | |
157 | \r | |
158 | @param VarGuid A unique identifier for the vendor.\r | |
159 | \r | |
160 | @retval EFI_SUCCESS The variable was found and removed\r | |
161 | @retval EFI_UNSUPPORTED The variable store was inaccessible\r | |
162 | @retval EFI_NOT_FOUND The variable was not found\r | |
163 | \r | |
164 | **/\r | |
165 | EFI_STATUS\r | |
166 | EfiLibDeleteVariable (\r | |
167 | IN CHAR16 *VarName,\r | |
168 | IN EFI_GUID *VarGuid\r | |
169 | )\r | |
170 | {\r | |
171 | return gRT->SetVariable (\r | |
172 | VarName,\r | |
173 | VarGuid,\r | |
174 | 0,\r | |
175 | 0,\r | |
176 | NULL\r | |
177 | );\r | |
178 | }\r | |
179 | \r | |
180 | /**\r | |
181 | \r | |
182 | Function gets the file system information from an open file descriptor,\r | |
183 | and stores it in a buffer allocated from pool.\r | |
184 | \r | |
185 | \r | |
186 | @param FHand The file handle.\r | |
187 | \r | |
188 | @return A pointer to a buffer with file information.\r | |
189 | @retval NULL is returned if failed to get Vaolume Label Info.\r | |
190 | \r | |
191 | **/\r | |
192 | EFI_FILE_SYSTEM_VOLUME_LABEL *\r | |
193 | EfiLibFileSystemVolumeLabelInfo (\r | |
194 | IN EFI_FILE_HANDLE FHand\r | |
195 | )\r | |
196 | {\r | |
197 | EFI_STATUS Status;\r | |
198 | EFI_FILE_SYSTEM_VOLUME_LABEL *Buffer;\r | |
199 | UINTN BufferSize;\r | |
200 | //\r | |
201 | // Initialize for GrowBuffer loop\r | |
202 | //\r | |
203 | Buffer = NULL;\r | |
204 | BufferSize = SIZE_OF_EFI_FILE_SYSTEM_VOLUME_LABEL + 200;\r | |
205 | \r | |
206 | //\r | |
207 | // Call the real function\r | |
208 | //\r | |
209 | while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {\r | |
210 | Status = FHand->GetInfo (\r | |
211 | FHand,\r | |
212 | &gEfiFileSystemVolumeLabelInfoIdGuid,\r | |
213 | &BufferSize,\r | |
214 | Buffer\r | |
215 | );\r | |
216 | }\r | |
217 | \r | |
218 | return Buffer;\r | |
219 | }\r | |
220 | \r | |
221 | /**\r | |
222 | Duplicate a string.\r | |
223 | \r | |
224 | @param Src The source.\r | |
225 | \r | |
226 | @return A new string which is duplicated copy of the source.\r | |
227 | @retval NULL If there is not enough memory.\r | |
228 | \r | |
229 | **/\r | |
230 | CHAR16 *\r | |
231 | EfiStrDuplicate (\r | |
232 | IN CHAR16 *Src\r | |
233 | )\r | |
234 | {\r | |
235 | CHAR16 *Dest;\r | |
236 | UINTN Size;\r | |
237 | \r | |
238 | Size = StrSize (Src);\r | |
239 | Dest = AllocateZeroPool (Size);\r | |
240 | ASSERT (Dest != NULL);\r | |
241 | if (Dest != NULL) {\r | |
242 | CopyMem (Dest, Src, Size);\r | |
243 | }\r | |
244 | \r | |
245 | return Dest;\r | |
246 | }\r | |
247 | \r | |
248 | /**\r | |
249 | \r | |
250 | Function gets the file information from an open file descriptor, and stores it\r | |
251 | in a buffer allocated from pool.\r | |
252 | \r | |
253 | @param FHand File Handle.\r | |
254 | \r | |
255 | @return A pointer to a buffer with file information or NULL is returned\r | |
256 | \r | |
257 | **/\r | |
258 | EFI_FILE_INFO *\r | |
259 | EfiLibFileInfo (\r | |
260 | IN EFI_FILE_HANDLE FHand\r | |
261 | )\r | |
262 | {\r | |
263 | EFI_STATUS Status;\r | |
264 | EFI_FILE_INFO *Buffer;\r | |
265 | UINTN BufferSize;\r | |
266 | \r | |
267 | //\r | |
268 | // Initialize for GrowBuffer loop\r | |
269 | //\r | |
270 | Buffer = NULL;\r | |
271 | BufferSize = SIZE_OF_EFI_FILE_INFO + 200;\r | |
272 | \r | |
273 | //\r | |
274 | // Call the real function\r | |
275 | //\r | |
276 | while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {\r | |
277 | Status = FHand->GetInfo (\r | |
278 | FHand,\r | |
279 | &gEfiFileInfoGuid,\r | |
280 | &BufferSize,\r | |
281 | Buffer\r | |
282 | );\r | |
283 | }\r | |
284 | \r | |
285 | return Buffer;\r | |
286 | }\r | |
287 | \r | |
288 | /**\r | |
289 | Function is used to determine the number of device path instances\r | |
290 | that exist in a device path.\r | |
291 | \r | |
292 | \r | |
293 | @param DevicePath A pointer to a device path data structure.\r | |
294 | \r | |
295 | @return This function counts and returns the number of device path instances\r | |
296 | in DevicePath.\r | |
297 | \r | |
298 | **/\r | |
299 | UINTN\r | |
300 | EfiDevicePathInstanceCount (\r | |
301 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath\r | |
302 | )\r | |
303 | {\r | |
304 | UINTN Count;\r | |
305 | UINTN Size;\r | |
306 | \r | |
307 | Count = 0;\r | |
308 | while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {\r | |
309 | Count += 1;\r | |
310 | }\r | |
311 | \r | |
312 | return Count;\r | |
313 | }\r | |
314 | \r | |
315 | /**\r | |
316 | Adjusts the size of a previously allocated buffer.\r | |
317 | \r | |
318 | \r | |
319 | @param OldPool - A pointer to the buffer whose size is being adjusted.\r | |
320 | @param OldSize - The size of the current buffer.\r | |
321 | @param NewSize - The size of the new buffer.\r | |
322 | \r | |
323 | @return The newly allocated buffer.\r | |
324 | @retval NULL Allocation failed.\r | |
325 | \r | |
326 | **/\r | |
327 | VOID *\r | |
328 | EfiReallocatePool (\r | |
329 | IN VOID *OldPool,\r | |
330 | IN UINTN OldSize,\r | |
331 | IN UINTN NewSize\r | |
332 | )\r | |
333 | {\r | |
334 | VOID *NewPool;\r | |
335 | \r | |
336 | NewPool = NULL;\r | |
337 | if (NewSize != 0) {\r | |
338 | NewPool = AllocateZeroPool (NewSize);\r | |
339 | }\r | |
340 | \r | |
341 | if (OldPool != NULL) {\r | |
342 | if (NewPool != NULL) {\r | |
343 | CopyMem (NewPool, OldPool, OldSize < NewSize ? OldSize : NewSize);\r | |
344 | }\r | |
345 | \r | |
346 | FreePool (OldPool);\r | |
347 | }\r | |
348 | \r | |
349 | return NewPool;\r | |
350 | }\r | |
351 | \r | |
352 | /**\r | |
353 | Get a string from the Data Hub record based on \r | |
354 | a device path.\r | |
355 | \r | |
356 | @param DevPath The device Path.\r | |
357 | \r | |
358 | @return A string located from the Data Hub records based on\r | |
359 | the device path.\r | |
360 | @retval NULL If failed to get the String from Data Hub.\r | |
361 | \r | |
362 | **/\r | |
363 | UINT16 *\r | |
364 | EfiLibStrFromDatahub (\r | |
365 | IN EFI_DEVICE_PATH_PROTOCOL *DevPath\r | |
366 | )\r | |
367 | {\r | |
368 | return NULL;\r | |
369 | }\r |