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d425764e JY |
1 | /** @file\r |
2 | Instance of SMM memory check library.\r | |
3 | \r | |
4 | SMM memory check library library implementation. This library consumes SMM_ACCESS2_PROTOCOL\r | |
5 | to get SMRAM information. In order to use this library instance, the platform should produce\r | |
6 | all SMRAM range via SMM_ACCESS2_PROTOCOL, including the range for firmware (like SMM Core\r | |
7 | and SMM driver) and/or specific dedicated hardware.\r | |
8 | \r | |
9095d37b | 9 | Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>\r |
d425764e JY |
10 | This program and the accompanying materials\r |
11 | are licensed and made available under the terms and conditions of the BSD License\r | |
12 | which accompanies this distribution. The full text of the license may be found at\r | |
13 | http://opensource.org/licenses/bsd-license.php\r | |
14 | \r | |
15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
16 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | \r | |
21 | #include <PiSmm.h>\r | |
22 | \r | |
23 | #include <Library/BaseLib.h>\r | |
24 | #include <Library/BaseMemoryLib.h>\r | |
25 | #include <Library/DebugLib.h>\r | |
26 | #include <Library/MemoryAllocationLib.h>\r | |
27 | #include <Library/UefiBootServicesTableLib.h>\r | |
28 | #include <Library/SmmServicesTableLib.h>\r | |
29 | #include <Library/HobLib.h>\r | |
30 | #include <Protocol/SmmAccess2.h>\r | |
91f51fcc JY |
31 | #include <Protocol/SmmReadyToLock.h>\r |
32 | #include <Protocol/SmmEndOfDxe.h>\r | |
33 | \r | |
34 | #define NEXT_MEMORY_DESCRIPTOR(MemoryDescriptor, Size) \\r | |
35 | ((EFI_MEMORY_DESCRIPTOR *)((UINT8 *)(MemoryDescriptor) + (Size)))\r | |
d425764e JY |
36 | \r |
37 | EFI_SMRAM_DESCRIPTOR *mSmmMemLibInternalSmramRanges;\r | |
38 | UINTN mSmmMemLibInternalSmramCount;\r | |
39 | \r | |
40 | //\r | |
41 | // Maximum support address used to check input buffer\r | |
42 | //\r | |
43 | EFI_PHYSICAL_ADDRESS mSmmMemLibInternalMaximumSupportAddress = 0;\r | |
44 | \r | |
91f51fcc JY |
45 | UINTN mMemoryMapEntryCount;\r |
46 | EFI_MEMORY_DESCRIPTOR *mMemoryMap;\r | |
47 | UINTN mDescriptorSize;\r | |
48 | \r | |
49 | VOID *mRegistrationEndOfDxe;\r | |
50 | VOID *mRegistrationReadyToLock;\r | |
51 | \r | |
52 | BOOLEAN mSmmReadyToLock = FALSE;\r | |
53 | \r | |
d425764e | 54 | /**\r |
2a93f2c3 | 55 | Calculate and save the maximum support address.\r |
d425764e JY |
56 | \r |
57 | **/\r | |
58 | VOID\r | |
2a93f2c3 | 59 | SmmMemLibInternalCalculateMaximumSupportAddress (\r |
d425764e JY |
60 | VOID\r |
61 | )\r | |
62 | {\r | |
63 | VOID *Hob;\r | |
64 | UINT32 RegEax;\r | |
65 | UINT8 PhysicalAddressBits;\r | |
66 | \r | |
67 | //\r | |
68 | // Get physical address bits supported.\r | |
69 | //\r | |
70 | Hob = GetFirstHob (EFI_HOB_TYPE_CPU);\r | |
71 | if (Hob != NULL) {\r | |
72 | PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;\r | |
73 | } else {\r | |
74 | AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r | |
75 | if (RegEax >= 0x80000008) {\r | |
76 | AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r | |
77 | PhysicalAddressBits = (UINT8) RegEax;\r | |
78 | } else {\r | |
79 | PhysicalAddressBits = 36;\r | |
80 | }\r | |
81 | }\r | |
82 | //\r | |
83 | // IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.\r | |
84 | //\r | |
85 | ASSERT (PhysicalAddressBits <= 52);\r | |
86 | if (PhysicalAddressBits > 48) {\r | |
87 | PhysicalAddressBits = 48;\r | |
88 | }\r | |
9095d37b | 89 | \r |
d425764e | 90 | //\r |
9095d37b | 91 | // Save the maximum support address in one global variable\r |
d425764e JY |
92 | //\r |
93 | mSmmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);\r | |
94 | DEBUG ((EFI_D_INFO, "mSmmMemLibInternalMaximumSupportAddress = 0x%lx\n", mSmmMemLibInternalMaximumSupportAddress));\r | |
95 | }\r | |
96 | \r | |
97 | /**\r | |
98 | This function check if the buffer is valid per processor architecture and not overlap with SMRAM.\r | |
99 | \r | |
100 | @param Buffer The buffer start address to be checked.\r | |
101 | @param Length The buffer length to be checked.\r | |
102 | \r | |
103 | @retval TRUE This buffer is valid per processor architecture and not overlap with SMRAM.\r | |
104 | @retval FALSE This buffer is not valid per processor architecture or overlap with SMRAM.\r | |
105 | **/\r | |
106 | BOOLEAN\r | |
107 | EFIAPI\r | |
108 | SmmIsBufferOutsideSmmValid (\r | |
109 | IN EFI_PHYSICAL_ADDRESS Buffer,\r | |
110 | IN UINT64 Length\r | |
111 | )\r | |
112 | {\r | |
113 | UINTN Index;\r | |
9095d37b | 114 | \r |
d425764e JY |
115 | //\r |
116 | // Check override.\r | |
117 | // NOTE: (B:0->L:4G) is invalid for IA32, but (B:1->L:4G-1)/(B:4G-1->L:1) is valid.\r | |
118 | //\r | |
119 | if ((Length > mSmmMemLibInternalMaximumSupportAddress) ||\r | |
120 | (Buffer > mSmmMemLibInternalMaximumSupportAddress) ||\r | |
121 | ((Length != 0) && (Buffer > (mSmmMemLibInternalMaximumSupportAddress - (Length - 1)))) ) {\r | |
122 | //\r | |
123 | // Overflow happen\r | |
124 | //\r | |
125 | DEBUG ((\r | |
126 | EFI_D_ERROR,\r | |
127 | "SmmIsBufferOutsideSmmValid: Overflow: Buffer (0x%lx) - Length (0x%lx), MaximumSupportAddress (0x%lx)\n",\r | |
128 | Buffer,\r | |
129 | Length,\r | |
130 | mSmmMemLibInternalMaximumSupportAddress\r | |
131 | ));\r | |
132 | return FALSE;\r | |
133 | }\r | |
9095d37b | 134 | \r |
d425764e JY |
135 | for (Index = 0; Index < mSmmMemLibInternalSmramCount; Index ++) {\r |
136 | if (((Buffer >= mSmmMemLibInternalSmramRanges[Index].CpuStart) && (Buffer < mSmmMemLibInternalSmramRanges[Index].CpuStart + mSmmMemLibInternalSmramRanges[Index].PhysicalSize)) ||\r | |
137 | ((mSmmMemLibInternalSmramRanges[Index].CpuStart >= Buffer) && (mSmmMemLibInternalSmramRanges[Index].CpuStart < Buffer + Length))) {\r | |
138 | DEBUG ((\r | |
139 | EFI_D_ERROR,\r | |
140 | "SmmIsBufferOutsideSmmValid: Overlap: Buffer (0x%lx) - Length (0x%lx), ",\r | |
141 | Buffer,\r | |
142 | Length\r | |
143 | ));\r | |
144 | DEBUG ((\r | |
145 | EFI_D_ERROR,\r | |
146 | "CpuStart (0x%lx) - PhysicalSize (0x%lx)\n",\r | |
147 | mSmmMemLibInternalSmramRanges[Index].CpuStart,\r | |
148 | mSmmMemLibInternalSmramRanges[Index].PhysicalSize\r | |
149 | ));\r | |
150 | return FALSE;\r | |
151 | }\r | |
152 | }\r | |
153 | \r | |
91f51fcc JY |
154 | //\r |
155 | // Check override for Valid Communication Region\r | |
156 | //\r | |
157 | if (mSmmReadyToLock) {\r | |
158 | EFI_MEMORY_DESCRIPTOR *MemoryMap;\r | |
159 | BOOLEAN InValidCommunicationRegion;\r | |
9095d37b | 160 | \r |
91f51fcc JY |
161 | InValidCommunicationRegion = FALSE;\r |
162 | MemoryMap = mMemoryMap;\r | |
163 | for (Index = 0; Index < mMemoryMapEntryCount; Index++) {\r | |
164 | if ((Buffer >= MemoryMap->PhysicalStart) &&\r | |
165 | (Buffer + Length <= MemoryMap->PhysicalStart + LShiftU64 (MemoryMap->NumberOfPages, EFI_PAGE_SHIFT))) {\r | |
166 | InValidCommunicationRegion = TRUE;\r | |
167 | }\r | |
168 | MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mDescriptorSize);\r | |
169 | }\r | |
170 | \r | |
171 | if (!InValidCommunicationRegion) {\r | |
172 | DEBUG ((\r | |
173 | EFI_D_ERROR,\r | |
174 | "SmmIsBufferOutsideSmmValid: Not in ValidCommunicationRegion: Buffer (0x%lx) - Length (0x%lx), ",\r | |
175 | Buffer,\r | |
176 | Length\r | |
177 | ));\r | |
91f51fcc JY |
178 | return FALSE;\r |
179 | }\r | |
180 | }\r | |
d425764e JY |
181 | return TRUE;\r |
182 | }\r | |
183 | \r | |
184 | /**\r | |
185 | Copies a source buffer (non-SMRAM) to a destination buffer (SMRAM).\r | |
186 | \r | |
187 | This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM).\r | |
188 | It checks if source buffer is valid per processor architecture and not overlap with SMRAM.\r | |
189 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
190 | If the check fails, it return EFI_SECURITY_VIOLATION.\r | |
191 | The implementation must be reentrant.\r | |
192 | \r | |
193 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r | |
194 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
195 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
196 | \r | |
197 | @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with SMRAM.\r | |
198 | @retval EFI_SUCCESS Memory is copied.\r | |
199 | \r | |
200 | **/\r | |
201 | EFI_STATUS\r | |
202 | EFIAPI\r | |
203 | SmmCopyMemToSmram (\r | |
204 | OUT VOID *DestinationBuffer,\r | |
205 | IN CONST VOID *SourceBuffer,\r | |
206 | IN UINTN Length\r | |
207 | )\r | |
208 | {\r | |
209 | if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {\r | |
210 | DEBUG ((EFI_D_ERROR, "SmmCopyMemToSmram: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));\r | |
211 | return EFI_SECURITY_VIOLATION;\r | |
212 | }\r | |
213 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
214 | return EFI_SUCCESS;\r | |
215 | }\r | |
216 | \r | |
217 | /**\r | |
218 | Copies a source buffer (SMRAM) to a destination buffer (NON-SMRAM).\r | |
219 | \r | |
220 | This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM).\r | |
221 | It checks if destination buffer is valid per processor architecture and not overlap with SMRAM.\r | |
222 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
223 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
224 | The implementation must be reentrant.\r | |
9095d37b | 225 | \r |
d425764e JY |
226 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r |
227 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
228 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
229 | \r | |
230 | @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with SMRAM.\r | |
231 | @retval EFI_SUCCESS Memory is copied.\r | |
232 | \r | |
233 | **/\r | |
234 | EFI_STATUS\r | |
235 | EFIAPI\r | |
236 | SmmCopyMemFromSmram (\r | |
237 | OUT VOID *DestinationBuffer,\r | |
238 | IN CONST VOID *SourceBuffer,\r | |
239 | IN UINTN Length\r | |
240 | )\r | |
241 | {\r | |
242 | if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {\r | |
243 | DEBUG ((EFI_D_ERROR, "SmmCopyMemFromSmram: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length));\r | |
244 | return EFI_SECURITY_VIOLATION;\r | |
245 | }\r | |
246 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
247 | return EFI_SUCCESS;\r | |
248 | }\r | |
249 | \r | |
250 | /**\r | |
251 | Copies a source buffer (NON-SMRAM) to a destination buffer (NON-SMRAM).\r | |
252 | \r | |
253 | This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM).\r | |
254 | It checks if source buffer and destination buffer are valid per processor architecture and not overlap with SMRAM.\r | |
255 | If the check passes, it copies memory and returns EFI_SUCCESS.\r | |
256 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
257 | The implementation must be reentrant, and it must handle the case where source buffer overlaps destination buffer.\r | |
9095d37b | 258 | \r |
d425764e JY |
259 | @param DestinationBuffer The pointer to the destination buffer of the memory copy.\r |
260 | @param SourceBuffer The pointer to the source buffer of the memory copy.\r | |
261 | @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer.\r | |
262 | \r | |
263 | @retval EFI_SECURITY_VIOLATION The DesinationBuffer is invalid per processor architecture or overlap with SMRAM.\r | |
264 | @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with SMRAM.\r | |
265 | @retval EFI_SUCCESS Memory is copied.\r | |
266 | \r | |
267 | **/\r | |
268 | EFI_STATUS\r | |
269 | EFIAPI\r | |
270 | SmmCopyMem (\r | |
271 | OUT VOID *DestinationBuffer,\r | |
272 | IN CONST VOID *SourceBuffer,\r | |
273 | IN UINTN Length\r | |
274 | )\r | |
275 | {\r | |
276 | if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) {\r | |
277 | DEBUG ((EFI_D_ERROR, "SmmCopyMem: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length));\r | |
278 | return EFI_SECURITY_VIOLATION;\r | |
279 | }\r | |
280 | if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) {\r | |
281 | DEBUG ((EFI_D_ERROR, "SmmCopyMem: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length));\r | |
282 | return EFI_SECURITY_VIOLATION;\r | |
283 | }\r | |
284 | CopyMem (DestinationBuffer, SourceBuffer, Length);\r | |
285 | return EFI_SUCCESS;\r | |
286 | }\r | |
287 | \r | |
288 | /**\r | |
289 | Fills a target buffer (NON-SMRAM) with a byte value.\r | |
290 | \r | |
291 | This function fills a target buffer (non-SMRAM) with a byte value.\r | |
292 | It checks if target buffer is valid per processor architecture and not overlap with SMRAM.\r | |
293 | If the check passes, it fills memory and returns EFI_SUCCESS.\r | |
294 | If the check fails, it returns EFI_SECURITY_VIOLATION.\r | |
9095d37b | 295 | \r |
d425764e JY |
296 | @param Buffer The memory to set.\r |
297 | @param Length The number of bytes to set.\r | |
298 | @param Value The value with which to fill Length bytes of Buffer.\r | |
9095d37b | 299 | \r |
d425764e JY |
300 | @retval EFI_SECURITY_VIOLATION The Buffer is invalid per processor architecture or overlap with SMRAM.\r |
301 | @retval EFI_SUCCESS Memory is set.\r | |
302 | \r | |
303 | **/\r | |
304 | EFI_STATUS\r | |
305 | EFIAPI\r | |
306 | SmmSetMem (\r | |
307 | OUT VOID *Buffer,\r | |
308 | IN UINTN Length,\r | |
309 | IN UINT8 Value\r | |
310 | )\r | |
311 | {\r | |
312 | if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)Buffer, Length)) {\r | |
313 | DEBUG ((EFI_D_ERROR, "SmmSetMem: Security Violation: Source (0x%x), Length (0x%x)\n", Buffer, Length));\r | |
314 | return EFI_SECURITY_VIOLATION;\r | |
315 | }\r | |
316 | SetMem (Buffer, Length, Value);\r | |
317 | return EFI_SUCCESS;\r | |
318 | }\r | |
319 | \r | |
91f51fcc JY |
320 | /**\r |
321 | Notification for SMM EndOfDxe protocol.\r | |
322 | \r | |
323 | @param[in] Protocol Points to the protocol's unique identifier.\r | |
324 | @param[in] Interface Points to the interface instance.\r | |
325 | @param[in] Handle The handle on which the interface was installed.\r | |
326 | \r | |
327 | @retval EFI_SUCCESS Notification runs successfully.\r | |
328 | **/\r | |
329 | EFI_STATUS\r | |
330 | EFIAPI\r | |
331 | SmmLibInternalEndOfDxeNotify (\r | |
332 | IN CONST EFI_GUID *Protocol,\r | |
333 | IN VOID *Interface,\r | |
334 | IN EFI_HANDLE Handle\r | |
335 | )\r | |
336 | {\r | |
337 | EFI_STATUS Status;\r | |
338 | UINTN MapKey;\r | |
339 | UINTN MemoryMapSize;\r | |
340 | EFI_MEMORY_DESCRIPTOR *MemoryMap;\r | |
341 | EFI_MEMORY_DESCRIPTOR *MemoryMapStart;\r | |
342 | EFI_MEMORY_DESCRIPTOR *SmmMemoryMapStart;\r | |
343 | UINTN MemoryMapEntryCount;\r | |
344 | UINTN DescriptorSize;\r | |
345 | UINT32 DescriptorVersion;\r | |
346 | UINTN Index;\r | |
347 | \r | |
348 | MemoryMapSize = 0;\r | |
349 | MemoryMap = NULL;\r | |
350 | Status = gBS->GetMemoryMap (\r | |
351 | &MemoryMapSize,\r | |
352 | MemoryMap,\r | |
353 | &MapKey,\r | |
354 | &DescriptorSize,\r | |
355 | &DescriptorVersion\r | |
356 | );\r | |
357 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
358 | \r | |
359 | do {\r | |
360 | Status = gBS->AllocatePool (EfiBootServicesData, MemoryMapSize, (VOID **)&MemoryMap);\r | |
361 | ASSERT (MemoryMap != NULL);\r | |
9095d37b | 362 | \r |
91f51fcc JY |
363 | Status = gBS->GetMemoryMap (\r |
364 | &MemoryMapSize,\r | |
365 | MemoryMap,\r | |
366 | &MapKey,\r | |
367 | &DescriptorSize,\r | |
368 | &DescriptorVersion\r | |
369 | );\r | |
370 | if (EFI_ERROR (Status)) {\r | |
371 | gBS->FreePool (MemoryMap);\r | |
372 | }\r | |
373 | } while (Status == EFI_BUFFER_TOO_SMALL);\r | |
374 | \r | |
375 | //\r | |
376 | // Get Count\r | |
377 | //\r | |
378 | mDescriptorSize = DescriptorSize;\r | |
379 | MemoryMapEntryCount = MemoryMapSize/DescriptorSize;\r | |
380 | MemoryMapStart = MemoryMap;\r | |
381 | mMemoryMapEntryCount = 0;\r | |
382 | for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r | |
383 | switch (MemoryMap->Type) {\r | |
384 | case EfiReservedMemoryType:\r | |
385 | case EfiRuntimeServicesCode:\r | |
386 | case EfiRuntimeServicesData:\r | |
387 | case EfiACPIMemoryNVS:\r | |
388 | mMemoryMapEntryCount++;\r | |
389 | break;\r | |
390 | }\r | |
391 | MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, DescriptorSize);\r | |
392 | }\r | |
393 | MemoryMap = MemoryMapStart;\r | |
9095d37b | 394 | \r |
91f51fcc JY |
395 | //\r |
396 | // Get Data\r | |
397 | //\r | |
398 | mMemoryMap = AllocatePool (mMemoryMapEntryCount*DescriptorSize);\r | |
399 | ASSERT (mMemoryMap != NULL);\r | |
400 | SmmMemoryMapStart = mMemoryMap;\r | |
401 | for (Index = 0; Index < MemoryMapEntryCount; Index++) {\r | |
402 | switch (MemoryMap->Type) {\r | |
403 | case EfiReservedMemoryType:\r | |
404 | case EfiRuntimeServicesCode:\r | |
405 | case EfiRuntimeServicesData:\r | |
406 | case EfiACPIMemoryNVS:\r | |
407 | CopyMem (mMemoryMap, MemoryMap, DescriptorSize);\r | |
408 | mMemoryMap = NEXT_MEMORY_DESCRIPTOR(mMemoryMap, DescriptorSize);\r | |
409 | break;\r | |
410 | }\r | |
411 | MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, DescriptorSize);\r | |
412 | }\r | |
413 | mMemoryMap = SmmMemoryMapStart;\r | |
414 | MemoryMap = MemoryMapStart;\r | |
9095d37b | 415 | \r |
91f51fcc JY |
416 | gBS->FreePool (MemoryMap);\r |
417 | \r | |
418 | return EFI_SUCCESS;\r | |
419 | }\r | |
420 | \r | |
421 | \r | |
422 | /**\r | |
423 | Notification for SMM ReadyToLock protocol.\r | |
424 | \r | |
425 | @param[in] Protocol Points to the protocol's unique identifier.\r | |
426 | @param[in] Interface Points to the interface instance.\r | |
427 | @param[in] Handle The handle on which the interface was installed.\r | |
428 | \r | |
429 | @retval EFI_SUCCESS Notification runs successfully.\r | |
430 | **/\r | |
431 | EFI_STATUS\r | |
432 | EFIAPI\r | |
433 | SmmLibInternalReadyToLockNotify (\r | |
434 | IN CONST EFI_GUID *Protocol,\r | |
435 | IN VOID *Interface,\r | |
436 | IN EFI_HANDLE Handle\r | |
437 | )\r | |
438 | {\r | |
439 | mSmmReadyToLock = TRUE;\r | |
440 | return EFI_SUCCESS;\r | |
441 | }\r | |
d425764e JY |
442 | /**\r |
443 | The constructor function initializes the Smm Mem library\r | |
444 | \r | |
445 | @param ImageHandle The firmware allocated handle for the EFI image.\r | |
446 | @param SystemTable A pointer to the EFI System Table.\r | |
447 | \r | |
448 | @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r | |
449 | \r | |
450 | **/\r | |
451 | EFI_STATUS\r | |
452 | EFIAPI\r | |
453 | SmmMemLibConstructor (\r | |
454 | IN EFI_HANDLE ImageHandle,\r | |
455 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
456 | )\r | |
457 | {\r | |
458 | EFI_STATUS Status;\r | |
459 | EFI_SMM_ACCESS2_PROTOCOL *SmmAccess;\r | |
460 | UINTN Size;\r | |
9095d37b | 461 | \r |
d425764e JY |
462 | //\r |
463 | // Get SMRAM information\r | |
464 | //\r | |
465 | Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&SmmAccess);\r | |
466 | ASSERT_EFI_ERROR (Status);\r | |
467 | \r | |
468 | Size = 0;\r | |
469 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, NULL);\r | |
470 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
471 | \r | |
472 | mSmmMemLibInternalSmramRanges = AllocatePool (Size);\r | |
473 | ASSERT (mSmmMemLibInternalSmramRanges != NULL);\r | |
474 | \r | |
475 | Status = SmmAccess->GetCapabilities (SmmAccess, &Size, mSmmMemLibInternalSmramRanges);\r | |
476 | ASSERT_EFI_ERROR (Status);\r | |
477 | \r | |
478 | mSmmMemLibInternalSmramCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR);\r | |
479 | \r | |
480 | //\r | |
2a93f2c3 | 481 | // Calculate and save maximum support address\r |
d425764e | 482 | //\r |
2a93f2c3 | 483 | SmmMemLibInternalCalculateMaximumSupportAddress ();\r |
d425764e | 484 | \r |
91f51fcc JY |
485 | //\r |
486 | // Register EndOfDxe to get UEFI memory map\r | |
487 | //\r | |
488 | Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, SmmLibInternalEndOfDxeNotify, &mRegistrationEndOfDxe);\r | |
489 | ASSERT_EFI_ERROR (Status);\r | |
490 | \r | |
491 | //\r | |
492 | // Register ready to lock so that we can know when to check valid SMRAM region\r | |
493 | //\r | |
494 | Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, SmmLibInternalReadyToLockNotify, &mRegistrationReadyToLock);\r | |
495 | ASSERT_EFI_ERROR (Status);\r | |
496 | \r | |
d425764e JY |
497 | return EFI_SUCCESS;\r |
498 | }\r | |
499 | \r | |
500 | /**\r | |
501 | The destructor function frees resource used in the Smm Mem library\r | |
502 | \r | |
503 | @param[in] ImageHandle The firmware allocated handle for the EFI image.\r | |
504 | @param[in] SystemTable A pointer to the EFI System Table.\r | |
505 | \r | |
506 | @retval EFI_SUCCESS The deconstructor always returns EFI_SUCCESS.\r | |
507 | **/\r | |
508 | EFI_STATUS\r | |
509 | EFIAPI\r | |
510 | SmmMemLibDestructor (\r | |
511 | IN EFI_HANDLE ImageHandle,\r | |
512 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
513 | )\r | |
514 | {\r | |
515 | FreePool (mSmmMemLibInternalSmramRanges);\r | |
516 | \r | |
91f51fcc JY |
517 | gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, NULL, &mRegistrationEndOfDxe);\r |
518 | gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, NULL, &mRegistrationReadyToLock);\r | |
d425764e JY |
519 | return EFI_SUCCESS;\r |
520 | }\r |