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8a2d4996 | 1 | /** @file\r |
2 | \r | |
3 | Implement all four UEFI Runtime Variable services for the nonvolatile\r | |
4 | and volatile storage space and install variable architecture protocol\r | |
5 | based on SMM variable module.\r | |
6 | \r | |
aab9212f | 7 | Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>\r |
8a2d4996 | 8 | This program and the accompanying materials \r |
9 | are licensed and made available under the terms and conditions of the BSD License \r | |
10 | which accompanies this distribution. The full text of the license may be found at \r | |
11 | http://opensource.org/licenses/bsd-license.php \r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
15 | \r | |
16 | **/\r | |
d00ed85e | 17 | #include <PiDxe.h>\r |
8a2d4996 | 18 | #include <Protocol/VariableWrite.h>\r |
19 | #include <Protocol/Variable.h>\r | |
20 | #include <Protocol/SmmCommunication.h>\r | |
d00ed85e | 21 | #include <Protocol/SmmVariable.h>\r |
ff843847 | 22 | #include <Protocol/VariableLock.h>\r |
8a2d4996 | 23 | \r |
24 | #include <Library/UefiBootServicesTableLib.h>\r | |
25 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
26 | #include <Library/MemoryAllocationLib.h>\r | |
27 | #include <Library/UefiDriverEntryPoint.h>\r | |
28 | #include <Library/UefiRuntimeLib.h>\r | |
29 | #include <Library/BaseMemoryLib.h>\r | |
30 | #include <Library/DebugLib.h>\r | |
31 | #include <Library/PcdLib.h>\r | |
32 | #include <Library/UefiLib.h>\r | |
33 | #include <Library/BaseLib.h>\r | |
34 | \r | |
35 | #include <Guid/EventGroup.h>\r | |
d00ed85e | 36 | #include <Guid/VariableFormat.h>\r |
37 | #include <Guid/SmmVariableCommon.h>\r | |
8a2d4996 | 38 | \r |
39 | EFI_HANDLE mHandle = NULL; \r | |
40 | EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable = NULL;\r | |
41 | EFI_EVENT mVirtualAddressChangeEvent = NULL;\r | |
42 | EFI_SMM_COMMUNICATION_PROTOCOL *mSmmCommunication = NULL;\r | |
43 | UINT8 *mVariableBuffer = NULL;\r | |
44 | UINT8 *mVariableBufferPhysical = NULL;\r | |
8a2d4996 | 45 | UINTN mVariableBufferSize;\r |
5e5bb2a9 | 46 | UINTN mVariableBufferPayloadSize;\r |
6ed1ec59 | 47 | EFI_LOCK mVariableServicesLock;\r |
ff843847 | 48 | EDKII_VARIABLE_LOCK_PROTOCOL mVariableLock;\r |
8a2d4996 | 49 | \r |
6ed1ec59 SZ |
50 | /**\r |
51 | Acquires lock only at boot time. Simply returns at runtime.\r | |
52 | \r | |
53 | This is a temperary function that will be removed when\r | |
54 | EfiAcquireLock() in UefiLib can handle the call in UEFI\r | |
55 | Runtimer driver in RT phase.\r | |
56 | It calls EfiAcquireLock() at boot time, and simply returns\r | |
57 | at runtime.\r | |
58 | \r | |
59 | @param Lock A pointer to the lock to acquire.\r | |
60 | \r | |
61 | **/\r | |
62 | VOID\r | |
63 | AcquireLockOnlyAtBootTime (\r | |
64 | IN EFI_LOCK *Lock\r | |
65 | )\r | |
66 | {\r | |
67 | if (!EfiAtRuntime ()) {\r | |
68 | EfiAcquireLock (Lock);\r | |
69 | }\r | |
70 | }\r | |
71 | \r | |
72 | /**\r | |
73 | Releases lock only at boot time. Simply returns at runtime.\r | |
74 | \r | |
75 | This is a temperary function which will be removed when\r | |
76 | EfiReleaseLock() in UefiLib can handle the call in UEFI\r | |
77 | Runtimer driver in RT phase.\r | |
78 | It calls EfiReleaseLock() at boot time and simply returns\r | |
79 | at runtime.\r | |
80 | \r | |
81 | @param Lock A pointer to the lock to release.\r | |
82 | \r | |
83 | **/\r | |
84 | VOID\r | |
85 | ReleaseLockOnlyAtBootTime (\r | |
86 | IN EFI_LOCK *Lock\r | |
87 | )\r | |
88 | {\r | |
89 | if (!EfiAtRuntime ()) {\r | |
90 | EfiReleaseLock (Lock);\r | |
91 | }\r | |
92 | }\r | |
8a2d4996 | 93 | \r |
94 | /**\r | |
95 | Initialize the communicate buffer using DataSize and Function.\r | |
96 | \r | |
97 | The communicate size is: SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE +\r | |
98 | DataSize.\r | |
99 | \r | |
100 | @param[out] DataPtr Points to the data in the communicate buffer.\r | |
101 | @param[in] DataSize The data size to send to SMM.\r | |
102 | @param[in] Function The function number to initialize the communicate header.\r | |
103 | \r | |
104 | @retval EFI_INVALID_PARAMETER The data size is too big.\r | |
105 | @retval EFI_SUCCESS Find the specified variable.\r | |
106 | \r | |
107 | **/\r | |
108 | EFI_STATUS\r | |
109 | InitCommunicateBuffer (\r | |
110 | OUT VOID **DataPtr OPTIONAL,\r | |
111 | IN UINTN DataSize,\r | |
112 | IN UINTN Function\r | |
113 | )\r | |
114 | {\r | |
115 | EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader; \r | |
116 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader; \r | |
117 | \r | |
118 | \r | |
119 | if (DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE > mVariableBufferSize) {\r | |
120 | return EFI_INVALID_PARAMETER;\r | |
121 | }\r | |
122 | \r | |
123 | SmmCommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *) mVariableBuffer;\r | |
124 | CopyGuid (&SmmCommunicateHeader->HeaderGuid, &gEfiSmmVariableProtocolGuid);\r | |
125 | SmmCommunicateHeader->MessageLength = DataSize + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
126 | \r | |
127 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *) SmmCommunicateHeader->Data;\r | |
128 | SmmVariableFunctionHeader->Function = Function;\r | |
129 | if (DataPtr != NULL) {\r | |
130 | *DataPtr = SmmVariableFunctionHeader->Data;\r | |
131 | }\r | |
132 | \r | |
133 | return EFI_SUCCESS;\r | |
134 | }\r | |
135 | \r | |
136 | \r | |
137 | /**\r | |
138 | Send the data in communicate buffer to SMM.\r | |
139 | \r | |
140 | @param[in] DataSize This size of the function header and the data.\r | |
141 | \r | |
32732a33 | 142 | @retval EFI_SUCCESS Success is returned from the functin in SMM.\r |
143 | @retval Others Failure is returned from the function in SMM. \r | |
8a2d4996 | 144 | \r |
145 | **/\r | |
146 | EFI_STATUS\r | |
147 | SendCommunicateBuffer (\r | |
148 | IN UINTN DataSize\r | |
149 | )\r | |
150 | {\r | |
151 | EFI_STATUS Status;\r | |
152 | UINTN CommSize;\r | |
153 | EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader; \r | |
154 | SMM_VARIABLE_COMMUNICATE_HEADER *SmmVariableFunctionHeader;\r | |
155 | \r | |
156 | CommSize = DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE;\r | |
157 | Status = mSmmCommunication->Communicate (mSmmCommunication, mVariableBufferPhysical, &CommSize);\r | |
158 | ASSERT_EFI_ERROR (Status);\r | |
159 | \r | |
160 | SmmCommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *) mVariableBuffer;\r | |
161 | SmmVariableFunctionHeader = (SMM_VARIABLE_COMMUNICATE_HEADER *)SmmCommunicateHeader->Data;\r | |
162 | return SmmVariableFunctionHeader->ReturnStatus;\r | |
163 | }\r | |
164 | \r | |
ff843847 RN |
165 | /**\r |
166 | Mark a variable that will become read-only after leaving the DXE phase of execution.\r | |
167 | \r | |
168 | @param[in] This The VARIABLE_LOCK_PROTOCOL instance.\r | |
169 | @param[in] VariableName A pointer to the variable name that will be made read-only subsequently.\r | |
170 | @param[in] VendorGuid A pointer to the vendor GUID that will be made read-only subsequently.\r | |
171 | \r | |
172 | @retval EFI_SUCCESS The variable specified by the VariableName and the VendorGuid was marked\r | |
173 | as pending to be read-only.\r | |
174 | @retval EFI_INVALID_PARAMETER VariableName or VendorGuid is NULL.\r | |
175 | Or VariableName is an empty string.\r | |
176 | @retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has\r | |
177 | already been signaled.\r | |
178 | @retval EFI_OUT_OF_RESOURCES There is not enough resource to hold the lock request.\r | |
179 | **/\r | |
180 | EFI_STATUS\r | |
181 | EFIAPI\r | |
182 | VariableLockRequestToLock (\r | |
183 | IN CONST EDKII_VARIABLE_LOCK_PROTOCOL *This,\r | |
184 | IN CHAR16 *VariableName,\r | |
185 | IN EFI_GUID *VendorGuid\r | |
186 | )\r | |
187 | {\r | |
188 | EFI_STATUS Status;\r | |
51547bb8 | 189 | UINTN VariableNameSize;\r |
ff843847 RN |
190 | UINTN PayloadSize;\r |
191 | SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE *VariableToLock;\r | |
192 | \r | |
193 | if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r | |
194 | return EFI_INVALID_PARAMETER;\r | |
195 | }\r | |
196 | \r | |
51547bb8 RN |
197 | VariableNameSize = StrSize (VariableName);\r |
198 | \r | |
199 | //\r | |
200 | // If VariableName exceeds SMM payload limit. Return failure\r | |
201 | //\r | |
202 | if (VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name)) {\r | |
203 | return EFI_INVALID_PARAMETER;\r | |
204 | }\r | |
205 | \r | |
ff843847 RN |
206 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
207 | \r | |
208 | //\r | |
209 | // Init the communicate buffer. The buffer data size is:\r | |
210 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
211 | //\r | |
51547bb8 | 212 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE, Name) + VariableNameSize;\r |
ff843847 RN |
213 | Status = InitCommunicateBuffer ((VOID **) &VariableToLock, PayloadSize, SMM_VARIABLE_FUNCTION_LOCK_VARIABLE);\r |
214 | if (EFI_ERROR (Status)) {\r | |
215 | goto Done;\r | |
216 | }\r | |
217 | ASSERT (VariableToLock != NULL);\r | |
218 | \r | |
219 | CopyGuid (&VariableToLock->Guid, VendorGuid);\r | |
51547bb8 | 220 | VariableToLock->NameSize = VariableNameSize;\r |
ff843847 RN |
221 | CopyMem (VariableToLock->Name, VariableName, VariableToLock->NameSize);\r |
222 | \r | |
223 | //\r | |
224 | // Send data to SMM.\r | |
225 | //\r | |
226 | Status = SendCommunicateBuffer (PayloadSize);\r | |
227 | \r | |
228 | Done:\r | |
229 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
230 | return Status;\r | |
231 | }\r | |
8a2d4996 | 232 | \r |
233 | /**\r | |
234 | This code finds variable in storage blocks (Volatile or Non-Volatile).\r | |
235 | \r | |
236 | @param[in] VariableName Name of Variable to be found.\r | |
237 | @param[in] VendorGuid Variable vendor GUID.\r | |
238 | @param[out] Attributes Attribute value of the variable found.\r | |
239 | @param[in, out] DataSize Size of Data found. If size is less than the\r | |
240 | data, this value contains the required size.\r | |
241 | @param[out] Data Data pointer.\r | |
242 | \r | |
243 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
244 | @retval EFI_SUCCESS Find the specified variable.\r | |
245 | @retval EFI_NOT_FOUND Not found.\r | |
246 | @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result.\r | |
247 | \r | |
248 | **/\r | |
249 | EFI_STATUS\r | |
250 | EFIAPI\r | |
251 | RuntimeServiceGetVariable (\r | |
252 | IN CHAR16 *VariableName,\r | |
253 | IN EFI_GUID *VendorGuid,\r | |
254 | OUT UINT32 *Attributes OPTIONAL,\r | |
255 | IN OUT UINTN *DataSize,\r | |
256 | OUT VOID *Data\r | |
257 | )\r | |
258 | {\r | |
259 | EFI_STATUS Status;\r | |
260 | UINTN PayloadSize;\r | |
261 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
3a146f2a | 262 | UINTN TempDataSize;\r |
9d00d20e | 263 | UINTN VariableNameSize;\r |
8a2d4996 | 264 | \r |
265 | if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {\r | |
266 | return EFI_INVALID_PARAMETER;\r | |
267 | }\r | |
268 | \r | |
269 | if ((*DataSize != 0) && (Data == NULL)) {\r | |
270 | return EFI_INVALID_PARAMETER;\r | |
271 | }\r | |
6ed1ec59 | 272 | \r |
3a146f2a | 273 | TempDataSize = *DataSize;\r |
9d00d20e | 274 | VariableNameSize = StrSize (VariableName);\r |
3a146f2a | 275 | \r |
276 | //\r | |
277 | // If VariableName exceeds SMM payload limit. Return failure\r | |
278 | //\r | |
5e5bb2a9 | 279 | if (VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) {\r |
3588bb35 SZ |
280 | return EFI_INVALID_PARAMETER;\r |
281 | }\r | |
282 | \r | |
6ed1ec59 SZ |
283 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
284 | \r | |
8a2d4996 | 285 | //\r |
286 | // Init the communicate buffer. The buffer data size is:\r | |
6ed1ec59 | 287 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r |
8a2d4996 | 288 | //\r |
5e5bb2a9 | 289 | if (TempDataSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize) {\r |
3a146f2a | 290 | //\r |
291 | // If output data buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r | |
292 | //\r | |
5e5bb2a9 | 293 | TempDataSize = mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize;\r |
3a146f2a | 294 | }\r |
9d00d20e | 295 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + VariableNameSize + TempDataSize;\r |
3a146f2a | 296 | \r |
5c7fa429 | 297 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_GET_VARIABLE);\r |
8a2d4996 | 298 | if (EFI_ERROR (Status)) {\r |
6ed1ec59 | 299 | goto Done;\r |
8a2d4996 | 300 | }\r |
301 | ASSERT (SmmVariableHeader != NULL);\r | |
302 | \r | |
303 | CopyGuid (&SmmVariableHeader->Guid, VendorGuid);\r | |
3a146f2a | 304 | SmmVariableHeader->DataSize = TempDataSize;\r |
9d00d20e | 305 | SmmVariableHeader->NameSize = VariableNameSize;\r |
8a2d4996 | 306 | if (Attributes == NULL) {\r |
307 | SmmVariableHeader->Attributes = 0;\r | |
308 | } else {\r | |
309 | SmmVariableHeader->Attributes = *Attributes;\r | |
310 | }\r | |
311 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
312 | \r | |
313 | //\r | |
314 | // Send data to SMM.\r | |
315 | //\r | |
316 | Status = SendCommunicateBuffer (PayloadSize);\r | |
317 | \r | |
318 | //\r | |
319 | // Get data from SMM.\r | |
320 | //\r | |
3a146f2a | 321 | if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {\r |
322 | //\r | |
323 | // SMM CommBuffer DataSize can be a trimed value\r | |
324 | // Only update DataSize when needed\r | |
325 | //\r | |
326 | *DataSize = SmmVariableHeader->DataSize;\r | |
327 | }\r | |
8a2d4996 | 328 | if (Attributes != NULL) {\r |
329 | *Attributes = SmmVariableHeader->Attributes;\r | |
330 | }\r | |
331 | \r | |
332 | if (EFI_ERROR (Status)) {\r | |
6ed1ec59 | 333 | goto Done;\r |
8a2d4996 | 334 | }\r |
335 | \r | |
336 | CopyMem (Data, (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize, SmmVariableHeader->DataSize);\r | |
337 | \r | |
6ed1ec59 SZ |
338 | Done:\r |
339 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
8a2d4996 | 340 | return Status;\r |
341 | }\r | |
342 | \r | |
343 | \r | |
344 | /**\r | |
345 | This code Finds the Next available variable.\r | |
346 | \r | |
347 | @param[in, out] VariableNameSize Size of the variable name.\r | |
348 | @param[in, out] VariableName Pointer to variable name.\r | |
349 | @param[in, out] VendorGuid Variable Vendor Guid.\r | |
350 | \r | |
351 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
352 | @retval EFI_SUCCESS Find the specified variable.\r | |
353 | @retval EFI_NOT_FOUND Not found.\r | |
354 | @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result.\r | |
355 | \r | |
356 | **/\r | |
357 | EFI_STATUS\r | |
358 | EFIAPI\r | |
359 | RuntimeServiceGetNextVariableName (\r | |
360 | IN OUT UINTN *VariableNameSize,\r | |
361 | IN OUT CHAR16 *VariableName,\r | |
362 | IN OUT EFI_GUID *VendorGuid\r | |
363 | )\r | |
364 | {\r | |
365 | EFI_STATUS Status;\r | |
366 | UINTN PayloadSize;\r | |
367 | SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME *SmmGetNextVariableName;\r | |
9d00d20e SZ |
368 | UINTN OutVariableNameSize;\r |
369 | UINTN InVariableNameSize;\r | |
8a2d4996 | 370 | \r |
371 | if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {\r | |
372 | return EFI_INVALID_PARAMETER;\r | |
373 | }\r | |
6ed1ec59 | 374 | \r |
9d00d20e SZ |
375 | OutVariableNameSize = *VariableNameSize;\r |
376 | InVariableNameSize = StrSize (VariableName);\r | |
0c55190f | 377 | \r |
378 | //\r | |
379 | // If input string exceeds SMM payload limit. Return failure\r | |
380 | //\r | |
5e5bb2a9 | 381 | if (InVariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
3588bb35 SZ |
382 | return EFI_INVALID_PARAMETER;\r |
383 | }\r | |
384 | \r | |
6ed1ec59 SZ |
385 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
386 | \r | |
8a2d4996 | 387 | //\r |
388 | // Init the communicate buffer. The buffer data size is:\r | |
389 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
390 | //\r | |
5e5bb2a9 | 391 | if (OutVariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name)) {\r |
0c55190f | 392 | //\r |
393 | // If output buffer exceed SMM payload limit. Trim output buffer to SMM payload size\r | |
394 | //\r | |
5e5bb2a9 | 395 | OutVariableNameSize = mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name);\r |
0c55190f | 396 | }\r |
397 | //\r | |
398 | // Payload should be Guid + NameSize + MAX of Input & Output buffer\r | |
399 | //\r | |
9d00d20e | 400 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + MAX (OutVariableNameSize, InVariableNameSize);\r |
0c55190f | 401 | \r |
402 | \r | |
5c7fa429 | 403 | Status = InitCommunicateBuffer ((VOID **)&SmmGetNextVariableName, PayloadSize, SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME);\r |
8a2d4996 | 404 | if (EFI_ERROR (Status)) {\r |
6ed1ec59 | 405 | goto Done;\r |
8a2d4996 | 406 | }\r |
407 | ASSERT (SmmGetNextVariableName != NULL);\r | |
408 | \r | |
0c55190f | 409 | //\r |
410 | // SMM comm buffer->NameSize is buffer size for return string\r | |
411 | //\r | |
9d00d20e | 412 | SmmGetNextVariableName->NameSize = OutVariableNameSize;\r |
0c55190f | 413 | \r |
8a2d4996 | 414 | CopyGuid (&SmmGetNextVariableName->Guid, VendorGuid);\r |
0c55190f | 415 | //\r |
416 | // Copy whole string\r | |
417 | //\r | |
9d00d20e SZ |
418 | CopyMem (SmmGetNextVariableName->Name, VariableName, InVariableNameSize);\r |
419 | if (OutVariableNameSize > InVariableNameSize) {\r | |
420 | ZeroMem ((UINT8 *) SmmGetNextVariableName->Name + InVariableNameSize, OutVariableNameSize - InVariableNameSize);\r | |
421 | }\r | |
8a2d4996 | 422 | \r |
423 | //\r | |
424 | // Send data to SMM\r | |
425 | //\r | |
426 | Status = SendCommunicateBuffer (PayloadSize);\r | |
427 | \r | |
428 | //\r | |
429 | // Get data from SMM.\r | |
430 | //\r | |
9d00d20e SZ |
431 | if (Status == EFI_SUCCESS || Status == EFI_BUFFER_TOO_SMALL) {\r |
432 | //\r | |
433 | // SMM CommBuffer NameSize can be a trimed value\r | |
434 | // Only update VariableNameSize when needed\r | |
435 | //\r | |
436 | *VariableNameSize = SmmGetNextVariableName->NameSize;\r | |
437 | }\r | |
8a2d4996 | 438 | if (EFI_ERROR (Status)) {\r |
6ed1ec59 | 439 | goto Done;\r |
8a2d4996 | 440 | }\r |
441 | \r | |
442 | CopyGuid (VendorGuid, &SmmGetNextVariableName->Guid);\r | |
443 | CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize); \r | |
444 | \r | |
6ed1ec59 SZ |
445 | Done:\r |
446 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
8a2d4996 | 447 | return Status;\r |
448 | }\r | |
449 | \r | |
450 | /**\r | |
451 | This code sets variable in storage blocks (Volatile or Non-Volatile).\r | |
452 | \r | |
453 | @param[in] VariableName Name of Variable to be found.\r | |
454 | @param[in] VendorGuid Variable vendor GUID.\r | |
455 | @param[in] Attributes Attribute value of the variable found\r | |
456 | @param[in] DataSize Size of Data found. If size is less than the\r | |
457 | data, this value contains the required size.\r | |
458 | @param[in] Data Data pointer.\r | |
459 | \r | |
460 | @retval EFI_INVALID_PARAMETER Invalid parameter.\r | |
461 | @retval EFI_SUCCESS Set successfully.\r | |
462 | @retval EFI_OUT_OF_RESOURCES Resource not enough to set variable.\r | |
463 | @retval EFI_NOT_FOUND Not found.\r | |
464 | @retval EFI_WRITE_PROTECTED Variable is read-only.\r | |
465 | \r | |
466 | **/\r | |
467 | EFI_STATUS\r | |
468 | EFIAPI\r | |
469 | RuntimeServiceSetVariable (\r | |
470 | IN CHAR16 *VariableName,\r | |
471 | IN EFI_GUID *VendorGuid,\r | |
472 | IN UINT32 Attributes,\r | |
473 | IN UINTN DataSize,\r | |
474 | IN VOID *Data\r | |
475 | )\r | |
476 | {\r | |
477 | EFI_STATUS Status;\r | |
478 | UINTN PayloadSize; \r | |
479 | SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *SmmVariableHeader;\r | |
9d00d20e | 480 | UINTN VariableNameSize;\r |
8a2d4996 | 481 | \r |
482 | //\r | |
483 | // Check input parameters.\r | |
484 | //\r | |
485 | if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {\r | |
486 | return EFI_INVALID_PARAMETER;\r | |
487 | } \r | |
488 | \r | |
489 | if (DataSize != 0 && Data == NULL) {\r | |
490 | return EFI_INVALID_PARAMETER;\r | |
491 | }\r | |
6ed1ec59 | 492 | \r |
9d00d20e | 493 | VariableNameSize = StrSize (VariableName);\r |
3588bb35 | 494 | \r |
5e5bb2a9 SZ |
495 | //\r |
496 | // If VariableName or DataSize exceeds SMM payload limit. Return failure\r | |
497 | //\r | |
498 | if ((VariableNameSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)) ||\r | |
499 | (DataSize > mVariableBufferPayloadSize - OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - VariableNameSize)){\r | |
56251c66 | 500 | return EFI_INVALID_PARAMETER;\r |
501 | }\r | |
502 | \r | |
6ed1ec59 SZ |
503 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r |
504 | \r | |
8a2d4996 | 505 | //\r |
506 | // Init the communicate buffer. The buffer data size is:\r | |
507 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.\r | |
508 | //\r | |
9d00d20e | 509 | PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + VariableNameSize + DataSize;\r |
5c7fa429 | 510 | Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_SET_VARIABLE);\r |
8a2d4996 | 511 | if (EFI_ERROR (Status)) {\r |
6ed1ec59 | 512 | goto Done;\r |
8a2d4996 | 513 | }\r |
514 | ASSERT (SmmVariableHeader != NULL);\r | |
515 | \r | |
516 | CopyGuid ((EFI_GUID *) &SmmVariableHeader->Guid, VendorGuid);\r | |
517 | SmmVariableHeader->DataSize = DataSize;\r | |
9d00d20e | 518 | SmmVariableHeader->NameSize = VariableNameSize;\r |
8a2d4996 | 519 | SmmVariableHeader->Attributes = Attributes;\r |
520 | CopyMem (SmmVariableHeader->Name, VariableName, SmmVariableHeader->NameSize);\r | |
521 | CopyMem ((UINT8 *) SmmVariableHeader->Name + SmmVariableHeader->NameSize, Data, DataSize);\r | |
522 | \r | |
523 | //\r | |
524 | // Send data to SMM.\r | |
525 | //\r | |
526 | Status = SendCommunicateBuffer (PayloadSize);\r | |
6ed1ec59 SZ |
527 | \r |
528 | Done:\r | |
529 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
8a2d4996 | 530 | return Status;\r |
531 | }\r | |
532 | \r | |
533 | \r | |
534 | /**\r | |
535 | This code returns information about the EFI variables.\r | |
536 | \r | |
537 | @param[in] Attributes Attributes bitmask to specify the type of variables\r | |
538 | on which to return information.\r | |
539 | @param[out] MaximumVariableStorageSize Pointer to the maximum size of the storage space available\r | |
540 | for the EFI variables associated with the attributes specified.\r | |
541 | @param[out] RemainingVariableStorageSize Pointer to the remaining size of the storage space available\r | |
542 | for EFI variables associated with the attributes specified.\r | |
543 | @param[out] MaximumVariableSize Pointer to the maximum size of an individual EFI variables\r | |
544 | associated with the attributes specified.\r | |
545 | \r | |
546 | @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.\r | |
547 | @retval EFI_SUCCESS Query successfully.\r | |
548 | @retval EFI_UNSUPPORTED The attribute is not supported on this platform.\r | |
549 | \r | |
550 | **/\r | |
551 | EFI_STATUS\r | |
552 | EFIAPI\r | |
553 | RuntimeServiceQueryVariableInfo (\r | |
554 | IN UINT32 Attributes,\r | |
555 | OUT UINT64 *MaximumVariableStorageSize,\r | |
556 | OUT UINT64 *RemainingVariableStorageSize,\r | |
557 | OUT UINT64 *MaximumVariableSize\r | |
558 | )\r | |
559 | {\r | |
560 | EFI_STATUS Status;\r | |
561 | UINTN PayloadSize;\r | |
562 | SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO *SmmQueryVariableInfo;\r | |
563 | \r | |
564 | if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {\r | |
565 | return EFI_INVALID_PARAMETER;\r | |
566 | }\r | |
6ed1ec59 SZ |
567 | \r |
568 | AcquireLockOnlyAtBootTime(&mVariableServicesLock);\r | |
569 | \r | |
8a2d4996 | 570 | //\r |
571 | // Init the communicate buffer. The buffer data size is:\r | |
572 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize;\r | |
573 | //\r | |
d00ed85e | 574 | PayloadSize = sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);\r |
5c7fa429 | 575 | Status = InitCommunicateBuffer ((VOID **)&SmmQueryVariableInfo, PayloadSize, SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO);\r |
8a2d4996 | 576 | if (EFI_ERROR (Status)) {\r |
6ed1ec59 | 577 | goto Done;\r |
8a2d4996 | 578 | }\r |
579 | ASSERT (SmmQueryVariableInfo != NULL);\r | |
580 | \r | |
581 | SmmQueryVariableInfo->Attributes = Attributes;\r | |
582 | \r | |
583 | //\r | |
584 | // Send data to SMM.\r | |
585 | //\r | |
586 | Status = SendCommunicateBuffer (PayloadSize);\r | |
587 | if (EFI_ERROR (Status)) {\r | |
6ed1ec59 | 588 | goto Done;\r |
8a2d4996 | 589 | }\r |
590 | \r | |
591 | //\r | |
592 | // Get data from SMM.\r | |
593 | //\r | |
594 | *MaximumVariableSize = SmmQueryVariableInfo->MaximumVariableSize;\r | |
595 | *MaximumVariableStorageSize = SmmQueryVariableInfo->MaximumVariableStorageSize;\r | |
596 | *RemainingVariableStorageSize = SmmQueryVariableInfo->RemainingVariableStorageSize; \r | |
6ed1ec59 SZ |
597 | \r |
598 | Done:\r | |
599 | ReleaseLockOnlyAtBootTime (&mVariableServicesLock);\r | |
aab9212f | 600 | return Status;\r |
8a2d4996 | 601 | }\r |
602 | \r | |
603 | \r | |
604 | /**\r | |
605 | Exit Boot Services Event notification handler.\r | |
606 | \r | |
607 | Notify SMM variable driver about the event.\r | |
608 | \r | |
609 | @param[in] Event Event whose notification function is being invoked.\r | |
610 | @param[in] Context Pointer to the notification function's context.\r | |
611 | \r | |
612 | **/\r | |
613 | VOID\r | |
614 | EFIAPI\r | |
615 | OnExitBootServices (\r | |
616 | IN EFI_EVENT Event,\r | |
617 | IN VOID *Context\r | |
618 | )\r | |
619 | {\r | |
620 | //\r | |
621 | // Init the communicate buffer. The buffer data size is:\r | |
622 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
623 | //\r | |
624 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE); \r | |
625 | \r | |
626 | //\r | |
627 | // Send data to SMM.\r | |
628 | //\r | |
629 | SendCommunicateBuffer (0);\r | |
630 | }\r | |
631 | \r | |
632 | \r | |
633 | /**\r | |
634 | On Ready To Boot Services Event notification handler.\r | |
635 | \r | |
636 | Notify SMM variable driver about the event.\r | |
637 | \r | |
638 | @param[in] Event Event whose notification function is being invoked\r | |
639 | @param[in] Context Pointer to the notification function's context\r | |
640 | \r | |
641 | **/\r | |
642 | VOID\r | |
643 | EFIAPI\r | |
644 | OnReadyToBoot (\r | |
645 | IN EFI_EVENT Event,\r | |
646 | IN VOID *Context\r | |
647 | )\r | |
648 | {\r | |
649 | //\r | |
650 | // Init the communicate buffer. The buffer data size is:\r | |
651 | // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE.\r | |
652 | //\r | |
653 | InitCommunicateBuffer (NULL, 0, SMM_VARIABLE_FUNCTION_READY_TO_BOOT);\r | |
654 | \r | |
655 | //\r | |
656 | // Send data to SMM.\r | |
657 | //\r | |
658 | SendCommunicateBuffer (0);\r | |
659 | }\r | |
660 | \r | |
661 | \r | |
662 | /**\r | |
663 | Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.\r | |
664 | \r | |
665 | This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r | |
666 | It convers pointer to new virtual address.\r | |
667 | \r | |
668 | @param[in] Event Event whose notification function is being invoked.\r | |
669 | @param[in] Context Pointer to the notification function's context.\r | |
670 | \r | |
671 | **/\r | |
672 | VOID\r | |
673 | EFIAPI\r | |
674 | VariableAddressChangeEvent (\r | |
675 | IN EFI_EVENT Event,\r | |
676 | IN VOID *Context\r | |
677 | )\r | |
678 | {\r | |
679 | EfiConvertPointer (0x0, (VOID **) &mVariableBuffer);\r | |
680 | EfiConvertPointer (0x0, (VOID **) &mSmmCommunication);\r | |
681 | }\r | |
682 | \r | |
683 | \r | |
684 | /**\r | |
685 | Initialize variable service and install Variable Architectural protocol.\r | |
686 | \r | |
687 | @param[in] Event Event whose notification function is being invoked.\r | |
688 | @param[in] Context Pointer to the notification function's context.\r | |
689 | \r | |
690 | **/\r | |
691 | VOID\r | |
692 | EFIAPI\r | |
693 | SmmVariableReady (\r | |
694 | IN EFI_EVENT Event,\r | |
695 | IN VOID *Context\r | |
696 | )\r | |
697 | {\r | |
698 | EFI_STATUS Status;\r | |
699 | \r | |
700 | Status = gBS->LocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID **)&mSmmVariable);\r | |
701 | if (EFI_ERROR (Status)) {\r | |
702 | return;\r | |
703 | }\r | |
704 | \r | |
705 | Status = gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);\r | |
706 | ASSERT_EFI_ERROR (Status);\r | |
707 | \r | |
708 | //\r | |
5e5bb2a9 | 709 | // Allocate memory for variable communicate buffer.\r |
8a2d4996 | 710 | //\r |
5e5bb2a9 SZ |
711 | mVariableBufferPayloadSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize)) +\r |
712 | OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) - sizeof (VARIABLE_HEADER);\r | |
713 | mVariableBufferSize = SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + mVariableBufferPayloadSize;\r | |
8a2d4996 | 714 | mVariableBuffer = AllocateRuntimePool (mVariableBufferSize);\r |
715 | ASSERT (mVariableBuffer != NULL);\r | |
716 | \r | |
717 | //\r | |
718 | // Save the buffer physical address used for SMM conmunication.\r | |
719 | //\r | |
720 | mVariableBufferPhysical = mVariableBuffer;\r | |
721 | \r | |
722 | gRT->GetVariable = RuntimeServiceGetVariable;\r | |
723 | gRT->GetNextVariableName = RuntimeServiceGetNextVariableName;\r | |
724 | gRT->SetVariable = RuntimeServiceSetVariable;\r | |
725 | gRT->QueryVariableInfo = RuntimeServiceQueryVariableInfo;\r | |
726 | \r | |
727 | //\r | |
728 | // Install the Variable Architectural Protocol on a new handle.\r | |
729 | //\r | |
730 | Status = gBS->InstallProtocolInterface (\r | |
731 | &mHandle,\r | |
732 | &gEfiVariableArchProtocolGuid, \r | |
733 | EFI_NATIVE_INTERFACE,\r | |
734 | NULL\r | |
735 | );\r | |
736 | ASSERT_EFI_ERROR (Status);\r | |
737 | }\r | |
738 | \r | |
739 | \r | |
740 | /**\r | |
741 | SMM Non-Volatile variable write service is ready notify event handler.\r | |
742 | \r | |
743 | @param[in] Event Event whose notification function is being invoked.\r | |
744 | @param[in] Context Pointer to the notification function's context.\r | |
745 | \r | |
746 | **/\r | |
747 | VOID\r | |
748 | EFIAPI\r | |
749 | SmmVariableWriteReady (\r | |
750 | IN EFI_EVENT Event,\r | |
751 | IN VOID *Context\r | |
752 | )\r | |
753 | {\r | |
754 | EFI_STATUS Status;\r | |
755 | VOID *ProtocolOps;\r | |
756 | \r | |
757 | //\r | |
758 | // Check whether the protocol is installed or not.\r | |
759 | //\r | |
d00ed85e | 760 | Status = gBS->LocateProtocol (&gSmmVariableWriteGuid, NULL, (VOID **) &ProtocolOps);\r |
8a2d4996 | 761 | if (EFI_ERROR (Status)) {\r |
762 | return;\r | |
763 | }\r | |
764 | \r | |
765 | Status = gBS->InstallProtocolInterface (\r | |
766 | &mHandle,\r | |
767 | &gEfiVariableWriteArchProtocolGuid, \r | |
768 | EFI_NATIVE_INTERFACE,\r | |
769 | NULL\r | |
770 | );\r | |
771 | ASSERT_EFI_ERROR (Status); \r | |
772 | }\r | |
773 | \r | |
774 | \r | |
775 | /**\r | |
776 | Variable Driver main entry point. The Variable driver places the 4 EFI\r | |
777 | runtime services in the EFI System Table and installs arch protocols \r | |
d00ed85e | 778 | for variable read and write services being available. It also registers\r |
8a2d4996 | 779 | a notification function for an EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r |
780 | \r | |
781 | @param[in] ImageHandle The firmware allocated handle for the EFI image. \r | |
782 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
783 | \r | |
784 | @retval EFI_SUCCESS Variable service successfully initialized.\r | |
785 | \r | |
786 | **/\r | |
787 | EFI_STATUS\r | |
788 | EFIAPI\r | |
789 | VariableSmmRuntimeInitialize (\r | |
790 | IN EFI_HANDLE ImageHandle,\r | |
791 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
792 | )\r | |
793 | {\r | |
ff843847 | 794 | EFI_STATUS Status;\r |
8a2d4996 | 795 | VOID *SmmVariableRegistration;\r |
796 | VOID *SmmVariableWriteRegistration;\r | |
797 | EFI_EVENT OnReadyToBootEvent;\r | |
798 | EFI_EVENT ExitBootServiceEvent;\r | |
6ed1ec59 SZ |
799 | \r |
800 | EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);\r | |
801 | \r | |
ff843847 RN |
802 | mVariableLock.RequestToLock = VariableLockRequestToLock;\r |
803 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
804 | &mHandle,\r | |
805 | &gEdkiiVariableLockProtocolGuid,\r | |
806 | &mVariableLock,\r | |
807 | NULL\r | |
808 | );\r | |
809 | ASSERT_EFI_ERROR (Status);\r | |
810 | \r | |
8a2d4996 | 811 | //\r |
812 | // Smm variable service is ready\r | |
813 | //\r | |
814 | EfiCreateProtocolNotifyEvent (\r | |
815 | &gEfiSmmVariableProtocolGuid, \r | |
816 | TPL_CALLBACK, \r | |
817 | SmmVariableReady, \r | |
818 | NULL, \r | |
819 | &SmmVariableRegistration\r | |
820 | );\r | |
821 | \r | |
822 | //\r | |
823 | // Smm Non-Volatile variable write service is ready\r | |
824 | //\r | |
825 | EfiCreateProtocolNotifyEvent (\r | |
d00ed85e | 826 | &gSmmVariableWriteGuid, \r |
8a2d4996 | 827 | TPL_CALLBACK, \r |
828 | SmmVariableWriteReady, \r | |
829 | NULL, \r | |
830 | &SmmVariableWriteRegistration\r | |
831 | );\r | |
832 | \r | |
833 | //\r | |
834 | // Register the event to reclaim variable for OS usage.\r | |
835 | //\r | |
836 | EfiCreateEventReadyToBootEx (\r | |
837 | TPL_NOTIFY, \r | |
838 | OnReadyToBoot, \r | |
839 | NULL, \r | |
840 | &OnReadyToBootEvent\r | |
841 | ); \r | |
842 | \r | |
843 | //\r | |
844 | // Register the event to inform SMM variable that it is at runtime.\r | |
845 | //\r | |
846 | gBS->CreateEventEx (\r | |
847 | EVT_NOTIFY_SIGNAL,\r | |
848 | TPL_NOTIFY,\r | |
849 | OnExitBootServices,\r | |
850 | NULL,\r | |
851 | &gEfiEventExitBootServicesGuid,\r | |
852 | &ExitBootServiceEvent\r | |
853 | ); \r | |
854 | \r | |
855 | //\r | |
856 | // Register the event to convert the pointer for runtime.\r | |
857 | //\r | |
858 | gBS->CreateEventEx (\r | |
859 | EVT_NOTIFY_SIGNAL,\r | |
860 | TPL_NOTIFY,\r | |
861 | VariableAddressChangeEvent,\r | |
862 | NULL,\r | |
863 | &gEfiEventVirtualAddressChangeGuid,\r | |
864 | &mVirtualAddressChangeEvent\r | |
865 | );\r | |
866 | \r | |
867 | return EFI_SUCCESS;\r | |
868 | }\r | |
869 | \r |