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529a5a86 MK |
1 | /** @file\r |
2 | Enable SMM profile.\r | |
3 | \r | |
d691abec | 4 | Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>\r |
529a5a86 MK |
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 "PiSmmCpuDxeSmm.h"\r | |
16 | #include "SmmProfileInternal.h"\r | |
17 | \r | |
18 | UINT32 mSmmProfileCr3;\r | |
19 | \r | |
20 | SMM_PROFILE_HEADER *mSmmProfileBase;\r | |
21 | MSR_DS_AREA_STRUCT *mMsrDsAreaBase;\r | |
22 | //\r | |
23 | // The buffer to store SMM profile data.\r | |
24 | //\r | |
25 | UINTN mSmmProfileSize;\r | |
26 | \r | |
27 | //\r | |
28 | // The buffer to enable branch trace store.\r | |
29 | //\r | |
30 | UINTN mMsrDsAreaSize = SMM_PROFILE_DTS_SIZE;\r | |
31 | \r | |
32 | //\r | |
33 | // The flag indicates if execute-disable is supported by processor.\r | |
34 | //\r | |
35 | BOOLEAN mXdSupported = FALSE;\r | |
36 | \r | |
37 | //\r | |
38 | // The flag indicates if execute-disable is enabled on processor.\r | |
39 | //\r | |
40 | BOOLEAN mXdEnabled = FALSE;\r | |
41 | \r | |
42 | //\r | |
43 | // The flag indicates if BTS is supported by processor.\r | |
44 | //\r | |
45 | BOOLEAN mBtsSupported = FALSE;\r | |
46 | \r | |
47 | //\r | |
48 | // The flag indicates if SMM profile starts to record data.\r | |
49 | //\r | |
50 | BOOLEAN mSmmProfileStart = FALSE;\r | |
51 | \r | |
52 | //\r | |
53 | // Record the page fault exception count for one instruction execution.\r | |
54 | //\r | |
55 | UINTN *mPFEntryCount;\r | |
56 | \r | |
57 | UINT64 (*mLastPFEntryValue)[MAX_PF_ENTRY_COUNT];\r | |
58 | UINT64 *(*mLastPFEntryPointer)[MAX_PF_ENTRY_COUNT];\r | |
59 | \r | |
60 | MSR_DS_AREA_STRUCT **mMsrDsArea;\r | |
61 | BRANCH_TRACE_RECORD **mMsrBTSRecord;\r | |
62 | UINTN mBTSRecordNumber;\r | |
63 | PEBS_RECORD **mMsrPEBSRecord;\r | |
64 | \r | |
65 | //\r | |
66 | // These memory ranges are always present, they does not generate the access type of page fault exception,\r | |
67 | // but they possibly generate instruction fetch type of page fault exception.\r | |
68 | //\r | |
69 | MEMORY_PROTECTION_RANGE *mProtectionMemRange = NULL;\r | |
70 | UINTN mProtectionMemRangeCount = 0;\r | |
71 | \r | |
72 | //\r | |
73 | // Some predefined memory ranges.\r | |
74 | //\r | |
75 | MEMORY_PROTECTION_RANGE mProtectionMemRangeTemplate[] = {\r | |
76 | //\r | |
77 | // SMRAM range (to be fixed in runtime).\r | |
78 | // It is always present and instruction fetches are allowed.\r | |
79 | //\r | |
80 | {{0x00000000, 0x00000000},TRUE,FALSE},\r | |
81 | \r | |
82 | //\r | |
83 | // SMM profile data range( to be fixed in runtime).\r | |
84 | // It is always present and instruction fetches are not allowed.\r | |
85 | //\r | |
86 | {{0x00000000, 0x00000000},TRUE,TRUE},\r | |
87 | \r | |
88 | //\r | |
89 | // Future extended range could be added here.\r | |
90 | //\r | |
91 | \r | |
92 | //\r | |
93 | // PCI MMIO ranges (to be added in runtime).\r | |
94 | // They are always present and instruction fetches are not allowed.\r | |
95 | //\r | |
96 | };\r | |
97 | \r | |
98 | //\r | |
99 | // These memory ranges are mapped by 4KB-page instead of 2MB-page.\r | |
100 | //\r | |
101 | MEMORY_RANGE *mSplitMemRange = NULL;\r | |
102 | UINTN mSplitMemRangeCount = 0;\r | |
103 | \r | |
104 | //\r | |
105 | // SMI command port.\r | |
106 | //\r | |
107 | UINT32 mSmiCommandPort;\r | |
108 | \r | |
109 | /**\r | |
110 | Disable branch trace store.\r | |
111 | \r | |
112 | **/\r | |
113 | VOID\r | |
114 | DisableBTS (\r | |
115 | VOID\r | |
116 | )\r | |
117 | {\r | |
118 | AsmMsrAnd64 (MSR_DEBUG_CTL, ~((UINT64)(MSR_DEBUG_CTL_BTS | MSR_DEBUG_CTL_TR)));\r | |
119 | }\r | |
120 | \r | |
121 | /**\r | |
122 | Enable branch trace store.\r | |
123 | \r | |
124 | **/\r | |
125 | VOID\r | |
126 | EnableBTS (\r | |
127 | VOID\r | |
128 | )\r | |
129 | {\r | |
130 | AsmMsrOr64 (MSR_DEBUG_CTL, (MSR_DEBUG_CTL_BTS | MSR_DEBUG_CTL_TR));\r | |
131 | }\r | |
132 | \r | |
133 | /**\r | |
134 | Get CPU Index from APIC ID.\r | |
135 | \r | |
136 | **/\r | |
137 | UINTN\r | |
138 | GetCpuIndex (\r | |
139 | VOID\r | |
140 | )\r | |
141 | {\r | |
142 | UINTN Index;\r | |
143 | UINT32 ApicId;\r | |
144 | \r | |
145 | ApicId = GetApicId ();\r | |
146 | \r | |
147 | for (Index = 0; Index < PcdGet32 (PcdCpuMaxLogicalProcessorNumber); Index++) {\r | |
148 | if (gSmmCpuPrivate->ProcessorInfo[Index].ProcessorId == ApicId) {\r | |
149 | return Index;\r | |
150 | }\r | |
151 | }\r | |
152 | ASSERT (FALSE);\r | |
153 | return 0;\r | |
154 | }\r | |
155 | \r | |
156 | /**\r | |
157 | Get the source of IP after execute-disable exception is triggered.\r | |
158 | \r | |
159 | @param CpuIndex The index of CPU.\r | |
160 | @param DestinationIP The destination address.\r | |
161 | \r | |
162 | **/\r | |
163 | UINT64\r | |
164 | GetSourceFromDestinationOnBts (\r | |
165 | UINTN CpuIndex,\r | |
166 | UINT64 DestinationIP\r | |
167 | )\r | |
168 | {\r | |
169 | BRANCH_TRACE_RECORD *CurrentBTSRecord;\r | |
170 | UINTN Index;\r | |
171 | BOOLEAN FirstMatch;\r | |
172 | \r | |
173 | FirstMatch = FALSE;\r | |
174 | \r | |
175 | CurrentBTSRecord = (BRANCH_TRACE_RECORD *)mMsrDsArea[CpuIndex]->BTSIndex;\r | |
176 | for (Index = 0; Index < mBTSRecordNumber; Index++) {\r | |
177 | if ((UINTN)CurrentBTSRecord < (UINTN)mMsrBTSRecord[CpuIndex]) {\r | |
178 | //\r | |
179 | // Underflow\r | |
180 | //\r | |
181 | CurrentBTSRecord = (BRANCH_TRACE_RECORD *)((UINTN)mMsrDsArea[CpuIndex]->BTSAbsoluteMaximum - 1);\r | |
182 | CurrentBTSRecord --;\r | |
183 | }\r | |
184 | if (CurrentBTSRecord->LastBranchTo == DestinationIP) {\r | |
185 | //\r | |
186 | // Good! find 1st one, then find 2nd one.\r | |
187 | //\r | |
188 | if (!FirstMatch) {\r | |
189 | //\r | |
190 | // The first one is DEBUG exception\r | |
191 | //\r | |
192 | FirstMatch = TRUE;\r | |
193 | } else {\r | |
194 | //\r | |
195 | // Good find proper one.\r | |
196 | //\r | |
197 | return CurrentBTSRecord->LastBranchFrom;\r | |
198 | }\r | |
199 | }\r | |
200 | CurrentBTSRecord--;\r | |
201 | }\r | |
202 | \r | |
203 | return 0;\r | |
204 | }\r | |
205 | \r | |
206 | /**\r | |
207 | SMM profile specific INT 1 (single-step) exception handler.\r | |
208 | \r | |
209 | @param InterruptType Defines the type of interrupt or exception that\r | |
210 | occurred on the processor.This parameter is processor architecture specific.\r | |
211 | @param SystemContext A pointer to the processor context when\r | |
212 | the interrupt occurred on the processor.\r | |
213 | **/\r | |
214 | VOID\r | |
215 | EFIAPI\r | |
216 | DebugExceptionHandler (\r | |
217 | IN EFI_EXCEPTION_TYPE InterruptType,\r | |
218 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
219 | )\r | |
220 | {\r | |
221 | UINTN CpuIndex;\r | |
222 | UINTN PFEntry;\r | |
223 | \r | |
224 | if (!mSmmProfileStart) {\r | |
225 | return;\r | |
226 | }\r | |
227 | CpuIndex = GetCpuIndex ();\r | |
228 | \r | |
229 | //\r | |
230 | // Clear last PF entries\r | |
231 | //\r | |
232 | for (PFEntry = 0; PFEntry < mPFEntryCount[CpuIndex]; PFEntry++) {\r | |
233 | *mLastPFEntryPointer[CpuIndex][PFEntry] = mLastPFEntryValue[CpuIndex][PFEntry];\r | |
234 | }\r | |
235 | \r | |
236 | //\r | |
237 | // Reset page fault exception count for next page fault.\r | |
238 | //\r | |
239 | mPFEntryCount[CpuIndex] = 0;\r | |
240 | \r | |
241 | //\r | |
242 | // Flush TLB\r | |
243 | //\r | |
244 | CpuFlushTlb ();\r | |
245 | \r | |
246 | //\r | |
247 | // Clear TF in EFLAGS\r | |
248 | //\r | |
249 | ClearTrapFlag (SystemContext);\r | |
250 | }\r | |
251 | \r | |
252 | /**\r | |
253 | Check if the memory address will be mapped by 4KB-page.\r | |
254 | \r | |
255 | @param Address The address of Memory.\r | |
256 | @param Nx The flag indicates if the memory is execute-disable.\r | |
257 | \r | |
258 | **/\r | |
259 | BOOLEAN\r | |
260 | IsAddressValid (\r | |
261 | IN EFI_PHYSICAL_ADDRESS Address,\r | |
262 | IN BOOLEAN *Nx\r | |
263 | )\r | |
264 | {\r | |
265 | UINTN Index;\r | |
266 | \r | |
267 | *Nx = FALSE;\r | |
268 | if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r | |
269 | //\r | |
270 | // Check configuration\r | |
271 | //\r | |
272 | for (Index = 0; Index < mProtectionMemRangeCount; Index++) {\r | |
273 | if ((Address >= mProtectionMemRange[Index].Range.Base) && (Address < mProtectionMemRange[Index].Range.Top)) {\r | |
274 | *Nx = mProtectionMemRange[Index].Nx;\r | |
275 | return mProtectionMemRange[Index].Present;\r | |
276 | }\r | |
277 | }\r | |
278 | *Nx = TRUE;\r | |
279 | return FALSE;\r | |
280 | \r | |
281 | } else {\r | |
282 | if ((Address < mCpuHotPlugData.SmrrBase) ||\r | |
283 | (Address >= mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize)) {\r | |
284 | *Nx = TRUE;\r | |
285 | }\r | |
286 | return TRUE;\r | |
287 | }\r | |
288 | }\r | |
289 | \r | |
290 | /**\r | |
291 | Check if the memory address will be mapped by 4KB-page.\r | |
292 | \r | |
293 | @param Address The address of Memory.\r | |
294 | \r | |
295 | **/\r | |
296 | BOOLEAN\r | |
297 | IsAddressSplit (\r | |
298 | IN EFI_PHYSICAL_ADDRESS Address\r | |
299 | )\r | |
300 | {\r | |
301 | UINTN Index;\r | |
302 | \r | |
303 | if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r | |
304 | //\r | |
305 | // Check configuration\r | |
306 | //\r | |
307 | for (Index = 0; Index < mSplitMemRangeCount; Index++) {\r | |
308 | if ((Address >= mSplitMemRange[Index].Base) && (Address < mSplitMemRange[Index].Top)) {\r | |
309 | return TRUE;\r | |
310 | }\r | |
311 | }\r | |
312 | } else {\r | |
313 | if (Address < mCpuHotPlugData.SmrrBase) {\r | |
314 | if ((mCpuHotPlugData.SmrrBase - Address) < BASE_2MB) {\r | |
315 | return TRUE;\r | |
316 | }\r | |
317 | } else if (Address > (mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize - BASE_2MB)) {\r | |
318 | if ((Address - (mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize - BASE_2MB)) < BASE_2MB) {\r | |
319 | return TRUE;\r | |
320 | }\r | |
321 | }\r | |
322 | }\r | |
323 | //\r | |
324 | // Return default\r | |
325 | //\r | |
326 | return FALSE;\r | |
327 | }\r | |
328 | \r | |
329 | /**\r | |
330 | Initialize the protected memory ranges and the 4KB-page mapped memory ranges.\r | |
331 | \r | |
332 | **/\r | |
333 | VOID\r | |
334 | InitProtectedMemRange (\r | |
335 | VOID\r | |
336 | )\r | |
337 | {\r | |
338 | UINTN Index;\r | |
339 | UINTN NumberOfDescriptors;\r | |
340 | UINTN NumberOfMmioDescriptors;\r | |
341 | UINTN NumberOfProtectRange;\r | |
342 | UINTN NumberOfSpliteRange;\r | |
343 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;\r | |
344 | UINTN TotalSize;\r | |
345 | EFI_STATUS Status;\r | |
346 | EFI_PHYSICAL_ADDRESS ProtectBaseAddress;\r | |
347 | EFI_PHYSICAL_ADDRESS ProtectEndAddress;\r | |
348 | EFI_PHYSICAL_ADDRESS Top2MBAlignedAddress;\r | |
349 | EFI_PHYSICAL_ADDRESS Base2MBAlignedAddress;\r | |
350 | UINT64 High4KBPageSize;\r | |
351 | UINT64 Low4KBPageSize;\r | |
352 | \r | |
353 | NumberOfDescriptors = 0;\r | |
354 | NumberOfMmioDescriptors = 0;\r | |
355 | NumberOfSpliteRange = 0;\r | |
356 | MemorySpaceMap = NULL;\r | |
357 | \r | |
358 | //\r | |
359 | // Get MMIO ranges from GCD and add them into protected memory ranges.\r | |
360 | //\r | |
361 | Status = gDS->GetMemorySpaceMap (\r | |
362 | &NumberOfDescriptors,\r | |
363 | &MemorySpaceMap\r | |
364 | );\r | |
365 | for (Index = 0; Index < NumberOfDescriptors; Index++) {\r | |
366 | if (MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeMemoryMappedIo) {\r | |
367 | NumberOfMmioDescriptors++;\r | |
368 | }\r | |
369 | }\r | |
370 | \r | |
371 | if (NumberOfMmioDescriptors != 0) {\r | |
372 | TotalSize = NumberOfMmioDescriptors * sizeof (MEMORY_PROTECTION_RANGE) + sizeof (mProtectionMemRangeTemplate);\r | |
373 | mProtectionMemRange = (MEMORY_PROTECTION_RANGE *) AllocateZeroPool (TotalSize);\r | |
374 | ASSERT (mProtectionMemRange != NULL);\r | |
375 | mProtectionMemRangeCount = TotalSize / sizeof (MEMORY_PROTECTION_RANGE);\r | |
376 | \r | |
377 | //\r | |
378 | // Copy existing ranges.\r | |
379 | //\r | |
380 | CopyMem (mProtectionMemRange, mProtectionMemRangeTemplate, sizeof (mProtectionMemRangeTemplate));\r | |
381 | \r | |
382 | //\r | |
383 | // Create split ranges which come from protected ranges.\r | |
384 | //\r | |
385 | TotalSize = (TotalSize / sizeof (MEMORY_PROTECTION_RANGE)) * sizeof (MEMORY_RANGE);\r | |
386 | mSplitMemRange = (MEMORY_RANGE *) AllocateZeroPool (TotalSize);\r | |
387 | ASSERT (mSplitMemRange != NULL);\r | |
388 | \r | |
389 | //\r | |
390 | // Create MMIO ranges which are set to present and execution-disable.\r | |
391 | //\r | |
392 | NumberOfProtectRange = sizeof (mProtectionMemRangeTemplate) / sizeof (MEMORY_PROTECTION_RANGE);\r | |
393 | for (Index = 0; Index < NumberOfDescriptors; Index++) {\r | |
394 | if (MemorySpaceMap[Index].GcdMemoryType != EfiGcdMemoryTypeMemoryMappedIo) {\r | |
395 | continue;\r | |
396 | }\r | |
397 | mProtectionMemRange[NumberOfProtectRange].Range.Base = MemorySpaceMap[Index].BaseAddress;\r | |
398 | mProtectionMemRange[NumberOfProtectRange].Range.Top = MemorySpaceMap[Index].BaseAddress + MemorySpaceMap[Index].Length;\r | |
399 | mProtectionMemRange[NumberOfProtectRange].Present = TRUE;\r | |
400 | mProtectionMemRange[NumberOfProtectRange].Nx = TRUE;\r | |
401 | NumberOfProtectRange++;\r | |
402 | }\r | |
403 | }\r | |
404 | \r | |
405 | //\r | |
406 | // According to protected ranges, create the ranges which will be mapped by 2KB page.\r | |
407 | //\r | |
408 | NumberOfSpliteRange = 0;\r | |
409 | NumberOfProtectRange = mProtectionMemRangeCount;\r | |
410 | for (Index = 0; Index < NumberOfProtectRange; Index++) {\r | |
411 | //\r | |
412 | // If MMIO base address is not 2MB alignment, make 2MB alignment for create 4KB page in page table.\r | |
413 | //\r | |
414 | ProtectBaseAddress = mProtectionMemRange[Index].Range.Base;\r | |
415 | ProtectEndAddress = mProtectionMemRange[Index].Range.Top;\r | |
416 | if (((ProtectBaseAddress & (SIZE_2MB - 1)) != 0) || ((ProtectEndAddress & (SIZE_2MB - 1)) != 0)) {\r | |
417 | //\r | |
418 | // Check if it is possible to create 4KB-page for not 2MB-aligned range and to create 2MB-page for 2MB-aligned range.\r | |
419 | // A mix of 4KB and 2MB page could save SMRAM space.\r | |
420 | //\r | |
421 | Top2MBAlignedAddress = ProtectEndAddress & ~(SIZE_2MB - 1);\r | |
422 | Base2MBAlignedAddress = (ProtectBaseAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1);\r | |
423 | if ((Top2MBAlignedAddress > Base2MBAlignedAddress) &&\r | |
424 | ((Top2MBAlignedAddress - Base2MBAlignedAddress) >= SIZE_2MB)) {\r | |
425 | //\r | |
426 | // There is an range which could be mapped by 2MB-page.\r | |
427 | //\r | |
428 | High4KBPageSize = ((ProtectEndAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1)) - (ProtectEndAddress & ~(SIZE_2MB - 1));\r | |
429 | Low4KBPageSize = ((ProtectBaseAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1)) - (ProtectBaseAddress & ~(SIZE_2MB - 1));\r | |
430 | if (High4KBPageSize != 0) {\r | |
431 | //\r | |
432 | // Add not 2MB-aligned range to be mapped by 4KB-page.\r | |
433 | //\r | |
434 | mSplitMemRange[NumberOfSpliteRange].Base = ProtectEndAddress & ~(SIZE_2MB - 1);\r | |
435 | mSplitMemRange[NumberOfSpliteRange].Top = (ProtectEndAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1);\r | |
436 | NumberOfSpliteRange++;\r | |
437 | }\r | |
438 | if (Low4KBPageSize != 0) {\r | |
439 | //\r | |
440 | // Add not 2MB-aligned range to be mapped by 4KB-page.\r | |
441 | //\r | |
442 | mSplitMemRange[NumberOfSpliteRange].Base = ProtectBaseAddress & ~(SIZE_2MB - 1);\r | |
443 | mSplitMemRange[NumberOfSpliteRange].Top = (ProtectBaseAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1);\r | |
444 | NumberOfSpliteRange++;\r | |
445 | }\r | |
446 | } else {\r | |
447 | //\r | |
448 | // The range could only be mapped by 4KB-page.\r | |
449 | //\r | |
450 | mSplitMemRange[NumberOfSpliteRange].Base = ProtectBaseAddress & ~(SIZE_2MB - 1);\r | |
451 | mSplitMemRange[NumberOfSpliteRange].Top = (ProtectEndAddress + SIZE_2MB - 1) & ~(SIZE_2MB - 1);\r | |
452 | NumberOfSpliteRange++;\r | |
453 | }\r | |
454 | }\r | |
455 | }\r | |
456 | \r | |
457 | mSplitMemRangeCount = NumberOfSpliteRange;\r | |
458 | \r | |
459 | DEBUG ((EFI_D_INFO, "SMM Profile Memory Ranges:\n"));\r | |
460 | for (Index = 0; Index < mProtectionMemRangeCount; Index++) {\r | |
461 | DEBUG ((EFI_D_INFO, "mProtectionMemRange[%d].Base = %lx\n", Index, mProtectionMemRange[Index].Range.Base));\r | |
462 | DEBUG ((EFI_D_INFO, "mProtectionMemRange[%d].Top = %lx\n", Index, mProtectionMemRange[Index].Range.Top));\r | |
463 | }\r | |
464 | for (Index = 0; Index < mSplitMemRangeCount; Index++) {\r | |
465 | DEBUG ((EFI_D_INFO, "mSplitMemRange[%d].Base = %lx\n", Index, mSplitMemRange[Index].Base));\r | |
466 | DEBUG ((EFI_D_INFO, "mSplitMemRange[%d].Top = %lx\n", Index, mSplitMemRange[Index].Top));\r | |
467 | }\r | |
468 | }\r | |
469 | \r | |
470 | /**\r | |
471 | Update page table according to protected memory ranges and the 4KB-page mapped memory ranges.\r | |
472 | \r | |
473 | **/\r | |
474 | VOID\r | |
475 | InitPaging (\r | |
476 | VOID\r | |
477 | )\r | |
478 | {\r | |
479 | UINT64 *Pml4;\r | |
480 | UINT64 *Pde;\r | |
481 | UINT64 *Pte;\r | |
482 | UINT64 *Pt;\r | |
483 | UINTN Address;\r | |
484 | UINTN Level1;\r | |
485 | UINTN Level2;\r | |
486 | UINTN Level3;\r | |
487 | UINTN Level4;\r | |
488 | UINTN NumberOfPdpEntries;\r | |
489 | UINTN NumberOfPml4Entries;\r | |
490 | UINTN SizeOfMemorySpace;\r | |
491 | BOOLEAN Nx;\r | |
492 | \r | |
493 | if (sizeof (UINTN) == sizeof (UINT64)) {\r | |
494 | Pml4 = (UINT64*)(UINTN)mSmmProfileCr3;\r | |
495 | SizeOfMemorySpace = HighBitSet64 (gPhyMask) + 1;\r | |
496 | //\r | |
497 | // Calculate the table entries of PML4E and PDPTE.\r | |
498 | //\r | |
499 | if (SizeOfMemorySpace <= 39 ) {\r | |
500 | NumberOfPml4Entries = 1;\r | |
501 | NumberOfPdpEntries = (UINT32)LShiftU64 (1, (SizeOfMemorySpace - 30));\r | |
502 | } else {\r | |
503 | NumberOfPml4Entries = (UINT32)LShiftU64 (1, (SizeOfMemorySpace - 39));\r | |
504 | NumberOfPdpEntries = 512;\r | |
505 | }\r | |
506 | } else {\r | |
507 | NumberOfPml4Entries = 1;\r | |
508 | NumberOfPdpEntries = 4;\r | |
509 | }\r | |
510 | \r | |
511 | //\r | |
512 | // Go through page table and change 2MB-page into 4KB-page.\r | |
513 | //\r | |
514 | for (Level1 = 0; Level1 < NumberOfPml4Entries; Level1++) {\r | |
515 | if (sizeof (UINTN) == sizeof (UINT64)) {\r | |
516 | if ((Pml4[Level1] & IA32_PG_P) == 0) {\r | |
517 | //\r | |
518 | // If Pml4 entry does not exist, skip it\r | |
519 | //\r | |
520 | continue;\r | |
521 | }\r | |
522 | Pde = (UINT64 *)(UINTN)(Pml4[Level1] & PHYSICAL_ADDRESS_MASK);\r | |
523 | } else {\r | |
524 | Pde = (UINT64*)(UINTN)mSmmProfileCr3;\r | |
525 | }\r | |
526 | for (Level2 = 0; Level2 < NumberOfPdpEntries; Level2++, Pde++) {\r | |
527 | if ((*Pde & IA32_PG_P) == 0) {\r | |
528 | //\r | |
529 | // If PDE entry does not exist, skip it\r | |
530 | //\r | |
531 | continue;\r | |
532 | }\r | |
533 | Pte = (UINT64 *)(UINTN)(*Pde & PHYSICAL_ADDRESS_MASK);\r | |
534 | if (Pte == 0) {\r | |
535 | continue;\r | |
536 | }\r | |
537 | for (Level3 = 0; Level3 < SIZE_4KB / sizeof (*Pte); Level3++, Pte++) {\r | |
538 | if ((*Pte & IA32_PG_P) == 0) {\r | |
539 | //\r | |
540 | // If PTE entry does not exist, skip it\r | |
541 | //\r | |
542 | continue;\r | |
543 | }\r | |
544 | Address = (((Level2 << 9) + Level3) << 21);\r | |
545 | \r | |
546 | //\r | |
547 | // If it is 2M page, check IsAddressSplit()\r | |
548 | //\r | |
549 | if (((*Pte & IA32_PG_PS) != 0) && IsAddressSplit (Address)) {\r | |
550 | //\r | |
551 | // Based on current page table, create 4KB page table for split area.\r | |
552 | //\r | |
553 | ASSERT (Address == (*Pte & PHYSICAL_ADDRESS_MASK));\r | |
554 | \r | |
21c17193 | 555 | Pt = AllocatePageTableMemory (1);\r |
529a5a86 MK |
556 | ASSERT (Pt != NULL);\r |
557 | \r | |
558 | // Split it\r | |
559 | for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++) {\r | |
881520ea | 560 | Pt[Level4] = Address + ((Level4 << 12) | PAGE_ATTRIBUTE_BITS);\r |
529a5a86 | 561 | } // end for PT\r |
881520ea | 562 | *Pte = (UINTN)Pt | PAGE_ATTRIBUTE_BITS;\r |
529a5a86 MK |
563 | } // end if IsAddressSplit\r |
564 | } // end for PTE\r | |
565 | } // end for PDE\r | |
566 | }\r | |
567 | \r | |
568 | //\r | |
569 | // Go through page table and set several page table entries to absent or execute-disable.\r | |
570 | //\r | |
571 | DEBUG ((EFI_D_INFO, "Patch page table start ...\n"));\r | |
572 | for (Level1 = 0; Level1 < NumberOfPml4Entries; Level1++) {\r | |
573 | if (sizeof (UINTN) == sizeof (UINT64)) {\r | |
574 | if ((Pml4[Level1] & IA32_PG_P) == 0) {\r | |
575 | //\r | |
576 | // If Pml4 entry does not exist, skip it\r | |
577 | //\r | |
578 | continue;\r | |
579 | }\r | |
580 | Pde = (UINT64 *)(UINTN)(Pml4[Level1] & PHYSICAL_ADDRESS_MASK);\r | |
581 | } else {\r | |
582 | Pde = (UINT64*)(UINTN)mSmmProfileCr3;\r | |
583 | }\r | |
584 | for (Level2 = 0; Level2 < NumberOfPdpEntries; Level2++, Pde++) {\r | |
585 | if ((*Pde & IA32_PG_P) == 0) {\r | |
586 | //\r | |
587 | // If PDE entry does not exist, skip it\r | |
588 | //\r | |
589 | continue;\r | |
590 | }\r | |
591 | Pte = (UINT64 *)(UINTN)(*Pde & PHYSICAL_ADDRESS_MASK);\r | |
592 | if (Pte == 0) {\r | |
593 | continue;\r | |
594 | }\r | |
595 | for (Level3 = 0; Level3 < SIZE_4KB / sizeof (*Pte); Level3++, Pte++) {\r | |
596 | if ((*Pte & IA32_PG_P) == 0) {\r | |
597 | //\r | |
598 | // If PTE entry does not exist, skip it\r | |
599 | //\r | |
600 | continue;\r | |
601 | }\r | |
602 | Address = (((Level2 << 9) + Level3) << 21);\r | |
603 | \r | |
604 | if ((*Pte & IA32_PG_PS) != 0) {\r | |
605 | // 2MB page\r | |
606 | \r | |
607 | if (!IsAddressValid (Address, &Nx)) {\r | |
608 | //\r | |
609 | // Patch to remove Present flag and RW flag\r | |
610 | //\r | |
881520ea | 611 | *Pte = *Pte & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);\r |
529a5a86 MK |
612 | }\r |
613 | if (Nx && mXdSupported) {\r | |
614 | *Pte = *Pte | IA32_PG_NX;\r | |
615 | }\r | |
616 | } else {\r | |
617 | // 4KB page\r | |
618 | Pt = (UINT64 *)(UINTN)(*Pte & PHYSICAL_ADDRESS_MASK);\r | |
619 | if (Pt == 0) {\r | |
620 | continue;\r | |
621 | }\r | |
622 | for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++, Pt++) {\r | |
623 | if (!IsAddressValid (Address, &Nx)) {\r | |
881520ea | 624 | *Pt = *Pt & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);\r |
529a5a86 MK |
625 | }\r |
626 | if (Nx && mXdSupported) {\r | |
627 | *Pt = *Pt | IA32_PG_NX;\r | |
628 | }\r | |
629 | Address += SIZE_4KB;\r | |
630 | } // end for PT\r | |
631 | } // end if PS\r | |
632 | } // end for PTE\r | |
633 | } // end for PDE\r | |
634 | }\r | |
635 | \r | |
636 | //\r | |
637 | // Flush TLB\r | |
638 | //\r | |
639 | CpuFlushTlb ();\r | |
640 | DEBUG ((EFI_D_INFO, "Patch page table done!\n"));\r | |
641 | //\r | |
642 | // Set execute-disable flag\r | |
643 | //\r | |
644 | mXdEnabled = TRUE;\r | |
645 | \r | |
646 | return ;\r | |
647 | }\r | |
648 | \r | |
649 | /**\r | |
650 | To find FADT in ACPI tables.\r | |
651 | \r | |
652 | @param AcpiTableGuid The GUID used to find ACPI table in UEFI ConfigurationTable.\r | |
653 | \r | |
654 | @return FADT table pointer.\r | |
655 | **/\r | |
656 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *\r | |
657 | FindAcpiFadtTableByAcpiGuid (\r | |
658 | IN EFI_GUID *AcpiTableGuid\r | |
659 | )\r | |
660 | {\r | |
661 | EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;\r | |
662 | EFI_ACPI_DESCRIPTION_HEADER *Rsdt;\r | |
663 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;\r | |
664 | UINTN Index;\r | |
665 | UINT32 Data32;\r | |
666 | Rsdp = NULL;\r | |
667 | Rsdt = NULL;\r | |
668 | Fadt = NULL;\r | |
669 | //\r | |
670 | // found ACPI table RSD_PTR from system table\r | |
671 | //\r | |
672 | for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {\r | |
673 | if (CompareGuid (&(gST->ConfigurationTable[Index].VendorGuid), AcpiTableGuid)) {\r | |
674 | //\r | |
675 | // A match was found.\r | |
676 | //\r | |
677 | Rsdp = gST->ConfigurationTable[Index].VendorTable;\r | |
678 | break;\r | |
679 | }\r | |
680 | }\r | |
681 | \r | |
682 | if (Rsdp == NULL) {\r | |
683 | return NULL;\r | |
684 | }\r | |
685 | \r | |
686 | Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;\r | |
687 | if (Rsdt == NULL || Rsdt->Signature != EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) {\r | |
688 | return NULL;\r | |
689 | }\r | |
690 | \r | |
691 | for (Index = sizeof (EFI_ACPI_DESCRIPTION_HEADER); Index < Rsdt->Length; Index = Index + sizeof (UINT32)) {\r | |
692 | \r | |
693 | Data32 = *(UINT32 *) ((UINT8 *) Rsdt + Index);\r | |
694 | Fadt = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *) (UINT32 *) (UINTN) Data32;\r | |
695 | if (Fadt->Header.Signature == EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {\r | |
696 | break;\r | |
697 | }\r | |
698 | }\r | |
699 | \r | |
700 | if (Fadt == NULL || Fadt->Header.Signature != EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {\r | |
701 | return NULL;\r | |
702 | }\r | |
703 | \r | |
704 | return Fadt;\r | |
705 | }\r | |
706 | \r | |
707 | /**\r | |
708 | To find FADT in ACPI tables.\r | |
709 | \r | |
710 | @return FADT table pointer.\r | |
711 | **/\r | |
712 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *\r | |
713 | FindAcpiFadtTable (\r | |
714 | VOID\r | |
715 | )\r | |
716 | {\r | |
717 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;\r | |
718 | \r | |
719 | Fadt = FindAcpiFadtTableByAcpiGuid (&gEfiAcpi20TableGuid);\r | |
720 | if (Fadt != NULL) {\r | |
721 | return Fadt;\r | |
722 | }\r | |
723 | \r | |
724 | return FindAcpiFadtTableByAcpiGuid (&gEfiAcpi10TableGuid);\r | |
725 | }\r | |
726 | \r | |
727 | /**\r | |
728 | To get system port address of the SMI Command Port in FADT table.\r | |
729 | \r | |
730 | **/\r | |
731 | VOID\r | |
732 | GetSmiCommandPort (\r | |
733 | VOID\r | |
734 | )\r | |
735 | {\r | |
736 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;\r | |
737 | \r | |
738 | Fadt = FindAcpiFadtTable ();\r | |
739 | ASSERT (Fadt != NULL);\r | |
740 | \r | |
741 | mSmiCommandPort = Fadt->SmiCmd;\r | |
742 | DEBUG ((EFI_D_INFO, "mSmiCommandPort = %x\n", mSmiCommandPort));\r | |
743 | }\r | |
744 | \r | |
745 | /**\r | |
746 | Updates page table to make some memory ranges (like system memory) absent\r | |
747 | and make some memory ranges (like MMIO) present and execute disable. It also\r | |
748 | update 2MB-page to 4KB-page for some memory ranges.\r | |
749 | \r | |
750 | **/\r | |
751 | VOID\r | |
752 | SmmProfileStart (\r | |
753 | VOID\r | |
754 | )\r | |
755 | {\r | |
756 | //\r | |
757 | // The flag indicates SMM profile starts to work.\r | |
758 | //\r | |
759 | mSmmProfileStart = TRUE;\r | |
760 | }\r | |
761 | \r | |
762 | /**\r | |
763 | Initialize SMM profile in SmmReadyToLock protocol callback function.\r | |
764 | \r | |
765 | @param Protocol Points to the protocol's unique identifier.\r | |
766 | @param Interface Points to the interface instance.\r | |
767 | @param Handle The handle on which the interface was installed.\r | |
768 | \r | |
769 | @retval EFI_SUCCESS SmmReadyToLock protocol callback runs successfully.\r | |
770 | **/\r | |
771 | EFI_STATUS\r | |
772 | EFIAPI\r | |
773 | InitSmmProfileCallBack (\r | |
774 | IN CONST EFI_GUID *Protocol,\r | |
775 | IN VOID *Interface,\r | |
776 | IN EFI_HANDLE Handle\r | |
777 | )\r | |
778 | {\r | |
779 | EFI_STATUS Status;\r | |
780 | \r | |
781 | //\r | |
782 | // Save to variable so that SMM profile data can be found.\r | |
783 | //\r | |
784 | Status = gRT->SetVariable (\r | |
785 | SMM_PROFILE_NAME,\r | |
786 | &gEfiCallerIdGuid,\r | |
787 | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
788 | sizeof(mSmmProfileBase),\r | |
789 | &mSmmProfileBase\r | |
790 | );\r | |
791 | \r | |
792 | //\r | |
793 | // Get Software SMI from FADT\r | |
794 | //\r | |
795 | GetSmiCommandPort ();\r | |
796 | \r | |
797 | //\r | |
798 | // Initialize protected memory range for patching page table later.\r | |
799 | //\r | |
800 | InitProtectedMemRange ();\r | |
801 | \r | |
802 | return EFI_SUCCESS;\r | |
803 | }\r | |
804 | \r | |
805 | /**\r | |
806 | Initialize SMM profile data structures.\r | |
807 | \r | |
808 | **/\r | |
809 | VOID\r | |
810 | InitSmmProfileInternal (\r | |
811 | VOID\r | |
812 | )\r | |
813 | {\r | |
814 | EFI_STATUS Status;\r | |
815 | EFI_PHYSICAL_ADDRESS Base;\r | |
816 | VOID *Registration;\r | |
817 | UINTN Index;\r | |
818 | UINTN MsrDsAreaSizePerCpu;\r | |
819 | UINTN TotalSize;\r | |
820 | \r | |
821 | mPFEntryCount = (UINTN *)AllocateZeroPool (sizeof (UINTN) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
822 | ASSERT (mPFEntryCount != NULL);\r | |
823 | mLastPFEntryValue = (UINT64 (*)[MAX_PF_ENTRY_COUNT])AllocateZeroPool (\r | |
824 | sizeof (mLastPFEntryValue[0]) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
825 | ASSERT (mLastPFEntryValue != NULL);\r | |
826 | mLastPFEntryPointer = (UINT64 *(*)[MAX_PF_ENTRY_COUNT])AllocateZeroPool (\r | |
827 | sizeof (mLastPFEntryPointer[0]) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
828 | ASSERT (mLastPFEntryPointer != NULL);\r | |
829 | \r | |
830 | //\r | |
831 | // Allocate memory for SmmProfile below 4GB.\r | |
832 | // The base address\r | |
833 | //\r | |
834 | mSmmProfileSize = PcdGet32 (PcdCpuSmmProfileSize);\r | |
835 | ASSERT ((mSmmProfileSize & 0xFFF) == 0);\r | |
836 | \r | |
837 | if (mBtsSupported) {\r | |
838 | TotalSize = mSmmProfileSize + mMsrDsAreaSize;\r | |
839 | } else {\r | |
840 | TotalSize = mSmmProfileSize;\r | |
841 | }\r | |
842 | \r | |
843 | Base = 0xFFFFFFFF;\r | |
844 | Status = gBS->AllocatePages (\r | |
845 | AllocateMaxAddress,\r | |
846 | EfiReservedMemoryType,\r | |
847 | EFI_SIZE_TO_PAGES (TotalSize),\r | |
848 | &Base\r | |
849 | );\r | |
850 | ASSERT_EFI_ERROR (Status);\r | |
851 | ZeroMem ((VOID *)(UINTN)Base, TotalSize);\r | |
852 | mSmmProfileBase = (SMM_PROFILE_HEADER *)(UINTN)Base;\r | |
853 | \r | |
854 | //\r | |
855 | // Initialize SMM profile data header.\r | |
856 | //\r | |
857 | mSmmProfileBase->HeaderSize = sizeof (SMM_PROFILE_HEADER);\r | |
858 | mSmmProfileBase->MaxDataEntries = (UINT64)((mSmmProfileSize - sizeof(SMM_PROFILE_HEADER)) / sizeof (SMM_PROFILE_ENTRY));\r | |
859 | mSmmProfileBase->MaxDataSize = MultU64x64 (mSmmProfileBase->MaxDataEntries, sizeof(SMM_PROFILE_ENTRY));\r | |
860 | mSmmProfileBase->CurDataEntries = 0;\r | |
861 | mSmmProfileBase->CurDataSize = 0;\r | |
862 | mSmmProfileBase->TsegStart = mCpuHotPlugData.SmrrBase;\r | |
863 | mSmmProfileBase->TsegSize = mCpuHotPlugData.SmrrSize;\r | |
864 | mSmmProfileBase->NumSmis = 0;\r | |
865 | mSmmProfileBase->NumCpus = gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus;\r | |
866 | \r | |
867 | if (mBtsSupported) {\r | |
868 | mMsrDsArea = (MSR_DS_AREA_STRUCT **)AllocateZeroPool (sizeof (MSR_DS_AREA_STRUCT *) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
869 | ASSERT (mMsrDsArea != NULL);\r | |
870 | mMsrBTSRecord = (BRANCH_TRACE_RECORD **)AllocateZeroPool (sizeof (BRANCH_TRACE_RECORD *) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
871 | ASSERT (mMsrBTSRecord != NULL);\r | |
872 | mMsrPEBSRecord = (PEBS_RECORD **)AllocateZeroPool (sizeof (PEBS_RECORD *) * PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r | |
873 | ASSERT (mMsrPEBSRecord != NULL);\r | |
874 | \r | |
875 | mMsrDsAreaBase = (MSR_DS_AREA_STRUCT *)((UINTN)Base + mSmmProfileSize);\r | |
876 | MsrDsAreaSizePerCpu = mMsrDsAreaSize / PcdGet32 (PcdCpuMaxLogicalProcessorNumber);\r | |
877 | mBTSRecordNumber = (MsrDsAreaSizePerCpu - sizeof(PEBS_RECORD) * PEBS_RECORD_NUMBER - sizeof(MSR_DS_AREA_STRUCT)) / sizeof(BRANCH_TRACE_RECORD);\r | |
878 | for (Index = 0; Index < PcdGet32 (PcdCpuMaxLogicalProcessorNumber); Index++) {\r | |
879 | mMsrDsArea[Index] = (MSR_DS_AREA_STRUCT *)((UINTN)mMsrDsAreaBase + MsrDsAreaSizePerCpu * Index);\r | |
880 | mMsrBTSRecord[Index] = (BRANCH_TRACE_RECORD *)((UINTN)mMsrDsArea[Index] + sizeof(MSR_DS_AREA_STRUCT));\r | |
881 | mMsrPEBSRecord[Index] = (PEBS_RECORD *)((UINTN)mMsrDsArea[Index] + MsrDsAreaSizePerCpu - sizeof(PEBS_RECORD) * PEBS_RECORD_NUMBER);\r | |
882 | \r | |
883 | mMsrDsArea[Index]->BTSBufferBase = (UINTN)mMsrBTSRecord[Index];\r | |
884 | mMsrDsArea[Index]->BTSIndex = mMsrDsArea[Index]->BTSBufferBase;\r | |
885 | mMsrDsArea[Index]->BTSAbsoluteMaximum = mMsrDsArea[Index]->BTSBufferBase + mBTSRecordNumber * sizeof(BRANCH_TRACE_RECORD) + 1;\r | |
886 | mMsrDsArea[Index]->BTSInterruptThreshold = mMsrDsArea[Index]->BTSAbsoluteMaximum + 1;\r | |
887 | \r | |
888 | mMsrDsArea[Index]->PEBSBufferBase = (UINTN)mMsrPEBSRecord[Index];\r | |
889 | mMsrDsArea[Index]->PEBSIndex = mMsrDsArea[Index]->PEBSBufferBase;\r | |
890 | mMsrDsArea[Index]->PEBSAbsoluteMaximum = mMsrDsArea[Index]->PEBSBufferBase + PEBS_RECORD_NUMBER * sizeof(PEBS_RECORD) + 1;\r | |
891 | mMsrDsArea[Index]->PEBSInterruptThreshold = mMsrDsArea[Index]->PEBSAbsoluteMaximum + 1;\r | |
892 | }\r | |
893 | }\r | |
894 | \r | |
895 | mProtectionMemRange = mProtectionMemRangeTemplate;\r | |
896 | mProtectionMemRangeCount = sizeof (mProtectionMemRangeTemplate) / sizeof (MEMORY_PROTECTION_RANGE);\r | |
897 | \r | |
898 | //\r | |
899 | // Update TSeg entry.\r | |
900 | //\r | |
901 | mProtectionMemRange[0].Range.Base = mCpuHotPlugData.SmrrBase;\r | |
902 | mProtectionMemRange[0].Range.Top = mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize;\r | |
903 | \r | |
904 | //\r | |
905 | // Update SMM profile entry.\r | |
906 | //\r | |
907 | mProtectionMemRange[1].Range.Base = (EFI_PHYSICAL_ADDRESS)(UINTN)mSmmProfileBase;\r | |
908 | mProtectionMemRange[1].Range.Top = (EFI_PHYSICAL_ADDRESS)(UINTN)mSmmProfileBase + TotalSize;\r | |
909 | \r | |
910 | //\r | |
911 | // Allocate memory reserved for creating 4KB pages.\r | |
912 | //\r | |
913 | InitPagesForPFHandler ();\r | |
914 | \r | |
915 | //\r | |
916 | // Start SMM profile when SmmReadyToLock protocol is installed.\r | |
917 | //\r | |
918 | Status = gSmst->SmmRegisterProtocolNotify (\r | |
919 | &gEfiSmmReadyToLockProtocolGuid,\r | |
920 | InitSmmProfileCallBack,\r | |
921 | &Registration\r | |
922 | );\r | |
923 | ASSERT_EFI_ERROR (Status);\r | |
924 | \r | |
925 | return ;\r | |
926 | }\r | |
927 | \r | |
928 | /**\r | |
929 | Check if XD feature is supported by a processor.\r | |
930 | \r | |
d691abec MK |
931 | @param[in,out] Buffer The pointer to private data buffer.\r |
932 | \r | |
529a5a86 MK |
933 | **/\r |
934 | VOID\r | |
d691abec | 935 | EFIAPI\r |
529a5a86 | 936 | CheckFeatureSupported (\r |
d691abec | 937 | IN OUT VOID *Buffer\r |
529a5a86 MK |
938 | )\r |
939 | {\r | |
940 | UINT32 RegEax;\r | |
941 | UINT32 RegEdx;\r | |
942 | \r | |
943 | if (mXdSupported) {\r | |
944 | AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL);\r | |
945 | if (RegEax <= CPUID_EXTENDED_FUNCTION) {\r | |
946 | //\r | |
947 | // Extended CPUID functions are not supported on this processor.\r | |
948 | //\r | |
949 | mXdSupported = FALSE;\r | |
950 | }\r | |
951 | \r | |
952 | AsmCpuid (CPUID_EXTENDED_CPU_SIG, NULL, NULL, NULL, &RegEdx);\r | |
953 | if ((RegEdx & CPUID1_EDX_XD_SUPPORT) == 0) {\r | |
954 | //\r | |
955 | // Execute Disable Bit feature is not supported on this processor.\r | |
956 | //\r | |
957 | mXdSupported = FALSE;\r | |
958 | }\r | |
959 | }\r | |
960 | \r | |
961 | if (mBtsSupported) {\r | |
962 | AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, &RegEdx);\r | |
963 | if ((RegEdx & CPUID1_EDX_BTS_AVAILABLE) != 0) {\r | |
964 | //\r | |
965 | // Per IA32 manuals:\r | |
966 | // When CPUID.1:EDX[21] is set, the following BTS facilities are available:\r | |
967 | // 1. The BTS_UNAVAILABLE flag in the IA32_MISC_ENABLE MSR indicates the\r | |
968 | // availability of the BTS facilities, including the ability to set the BTS and\r | |
969 | // BTINT bits in the MSR_DEBUGCTLA MSR.\r | |
970 | // 2. The IA32_DS_AREA MSR can be programmed to point to the DS save area.\r | |
971 | //\r | |
972 | if ((AsmMsrBitFieldRead64 (MSR_IA32_MISC_ENABLE, 11, 11) == 0) &&\r | |
973 | (AsmMsrBitFieldRead64 (MSR_IA32_MISC_ENABLE, 12, 12) == 0)) {\r | |
974 | //\r | |
975 | // BTS facilities is supported.\r | |
976 | //\r | |
977 | mBtsSupported = FALSE;\r | |
978 | }\r | |
979 | }\r | |
980 | }\r | |
981 | }\r | |
982 | \r | |
983 | /**\r | |
984 | Check if XD and BTS features are supported by all processors.\r | |
985 | \r | |
986 | **/\r | |
987 | VOID\r | |
988 | CheckProcessorFeature (\r | |
989 | VOID\r | |
990 | )\r | |
991 | {\r | |
992 | EFI_STATUS Status;\r | |
993 | EFI_MP_SERVICES_PROTOCOL *MpServices;\r | |
994 | \r | |
995 | Status = gBS->LocateProtocol (&gEfiMpServiceProtocolGuid, NULL, (VOID **)&MpServices);\r | |
996 | ASSERT_EFI_ERROR (Status);\r | |
997 | \r | |
998 | //\r | |
999 | // First detect if XD and BTS are supported\r | |
1000 | //\r | |
1001 | mXdSupported = TRUE;\r | |
1002 | mBtsSupported = TRUE;\r | |
1003 | \r | |
1004 | //\r | |
1005 | // Check if XD and BTS are supported on all processors.\r | |
1006 | //\r | |
d691abec | 1007 | CheckFeatureSupported (NULL);\r |
529a5a86 MK |
1008 | \r |
1009 | //\r | |
1010 | //Check on other processors if BSP supports this\r | |
1011 | //\r | |
1012 | if (mXdSupported || mBtsSupported) {\r | |
1013 | MpServices->StartupAllAPs (\r | |
1014 | MpServices,\r | |
d691abec | 1015 | CheckFeatureSupported,\r |
529a5a86 MK |
1016 | TRUE,\r |
1017 | NULL,\r | |
1018 | 0,\r | |
1019 | NULL,\r | |
1020 | NULL\r | |
1021 | );\r | |
1022 | }\r | |
1023 | }\r | |
1024 | \r | |
1025 | /**\r | |
1026 | Enable XD feature.\r | |
1027 | \r | |
1028 | **/\r | |
1029 | VOID\r | |
1030 | ActivateXd (\r | |
1031 | VOID\r | |
1032 | )\r | |
1033 | {\r | |
1034 | UINT64 MsrRegisters;\r | |
1035 | \r | |
1036 | MsrRegisters = AsmReadMsr64 (MSR_EFER);\r | |
1037 | if ((MsrRegisters & MSR_EFER_XD) != 0) {\r | |
1038 | return ;\r | |
1039 | }\r | |
1040 | MsrRegisters |= MSR_EFER_XD;\r | |
1041 | AsmWriteMsr64 (MSR_EFER, MsrRegisters);\r | |
1042 | }\r | |
1043 | \r | |
1044 | /**\r | |
1045 | Enable single step.\r | |
1046 | \r | |
1047 | **/\r | |
1048 | VOID\r | |
1049 | ActivateSingleStepDB (\r | |
1050 | VOID\r | |
1051 | )\r | |
1052 | {\r | |
1053 | UINTN Dr6;\r | |
1054 | \r | |
1055 | Dr6 = AsmReadDr6 ();\r | |
1056 | if ((Dr6 & DR6_SINGLE_STEP) != 0) {\r | |
1057 | return;\r | |
1058 | }\r | |
1059 | Dr6 |= DR6_SINGLE_STEP;\r | |
1060 | AsmWriteDr6 (Dr6);\r | |
1061 | }\r | |
1062 | \r | |
1063 | /**\r | |
1064 | Enable last branch.\r | |
1065 | \r | |
1066 | **/\r | |
1067 | VOID\r | |
1068 | ActivateLBR (\r | |
1069 | VOID\r | |
1070 | )\r | |
1071 | {\r | |
1072 | UINT64 DebugCtl;\r | |
1073 | \r | |
1074 | DebugCtl = AsmReadMsr64 (MSR_DEBUG_CTL);\r | |
1075 | if ((DebugCtl & MSR_DEBUG_CTL_LBR) != 0) {\r | |
1076 | return ;\r | |
1077 | }\r | |
1078 | AsmWriteMsr64 (MSR_LER_FROM_LIP, 0);\r | |
1079 | AsmWriteMsr64 (MSR_LER_TO_LIP, 0);\r | |
1080 | DebugCtl |= MSR_DEBUG_CTL_LBR;\r | |
1081 | AsmWriteMsr64 (MSR_DEBUG_CTL, DebugCtl);\r | |
1082 | }\r | |
1083 | \r | |
1084 | /**\r | |
1085 | Enable branch trace store.\r | |
1086 | \r | |
1087 | @param CpuIndex The index of the processor.\r | |
1088 | \r | |
1089 | **/\r | |
1090 | VOID\r | |
1091 | ActivateBTS (\r | |
1092 | IN UINTN CpuIndex\r | |
1093 | )\r | |
1094 | {\r | |
1095 | UINT64 DebugCtl;\r | |
1096 | \r | |
1097 | DebugCtl = AsmReadMsr64 (MSR_DEBUG_CTL);\r | |
1098 | if ((DebugCtl & MSR_DEBUG_CTL_BTS) != 0) {\r | |
1099 | return ;\r | |
1100 | }\r | |
1101 | \r | |
1102 | AsmWriteMsr64 (MSR_DS_AREA, (UINT64)(UINTN)mMsrDsArea[CpuIndex]);\r | |
1103 | DebugCtl |= (UINT64)(MSR_DEBUG_CTL_BTS | MSR_DEBUG_CTL_TR);\r | |
1104 | DebugCtl &= ~((UINT64)MSR_DEBUG_CTL_BTINT);\r | |
1105 | AsmWriteMsr64 (MSR_DEBUG_CTL, DebugCtl);\r | |
1106 | }\r | |
1107 | \r | |
1108 | /**\r | |
1109 | Increase SMI number in each SMI entry.\r | |
1110 | \r | |
1111 | **/\r | |
1112 | VOID\r | |
1113 | SmmProfileRecordSmiNum (\r | |
1114 | VOID\r | |
1115 | )\r | |
1116 | {\r | |
1117 | if (mSmmProfileStart) {\r | |
1118 | mSmmProfileBase->NumSmis++;\r | |
1119 | }\r | |
1120 | }\r | |
1121 | \r | |
1122 | /**\r | |
1123 | Initialize processor environment for SMM profile.\r | |
1124 | \r | |
1125 | @param CpuIndex The index of the processor.\r | |
1126 | \r | |
1127 | **/\r | |
1128 | VOID\r | |
1129 | ActivateSmmProfile (\r | |
1130 | IN UINTN CpuIndex\r | |
1131 | )\r | |
1132 | {\r | |
1133 | //\r | |
1134 | // Enable Single Step DB#\r | |
1135 | //\r | |
1136 | ActivateSingleStepDB ();\r | |
1137 | \r | |
1138 | if (mBtsSupported) {\r | |
1139 | //\r | |
1140 | // We can not get useful information from LER, so we have to use BTS.\r | |
1141 | //\r | |
1142 | ActivateLBR ();\r | |
1143 | \r | |
1144 | //\r | |
1145 | // Enable BTS\r | |
1146 | //\r | |
1147 | ActivateBTS (CpuIndex);\r | |
1148 | }\r | |
1149 | }\r | |
1150 | \r | |
1151 | /**\r | |
1152 | Initialize SMM profile in SMM CPU entry point.\r | |
1153 | \r | |
1154 | @param[in] Cr3 The base address of the page tables to use in SMM.\r | |
1155 | \r | |
1156 | **/\r | |
1157 | VOID\r | |
1158 | InitSmmProfile (\r | |
1159 | UINT32 Cr3\r | |
1160 | )\r | |
1161 | {\r | |
1162 | //\r | |
1163 | // Save Cr3\r | |
1164 | //\r | |
1165 | mSmmProfileCr3 = Cr3;\r | |
1166 | \r | |
1167 | //\r | |
1168 | // Skip SMM profile initialization if feature is disabled\r | |
1169 | //\r | |
1170 | if (!FeaturePcdGet (PcdCpuSmmProfileEnable)) {\r | |
1171 | return;\r | |
1172 | }\r | |
1173 | \r | |
1174 | //\r | |
1175 | // Initialize SmmProfile here\r | |
1176 | //\r | |
1177 | InitSmmProfileInternal ();\r | |
1178 | \r | |
1179 | //\r | |
1180 | // Initialize profile IDT.\r | |
1181 | //\r | |
1182 | InitIdtr ();\r | |
1183 | }\r | |
1184 | \r | |
1185 | /**\r | |
1186 | Update page table to map the memory correctly in order to make the instruction\r | |
1187 | which caused page fault execute successfully. And it also save the original page\r | |
1188 | table to be restored in single-step exception.\r | |
1189 | \r | |
1190 | @param PageTable PageTable Address.\r | |
1191 | @param PFAddress The memory address which caused page fault exception.\r | |
1192 | @param CpuIndex The index of the processor.\r | |
1193 | @param ErrorCode The Error code of exception.\r | |
1194 | \r | |
1195 | **/\r | |
1196 | VOID\r | |
1197 | RestorePageTableBelow4G (\r | |
1198 | UINT64 *PageTable,\r | |
1199 | UINT64 PFAddress,\r | |
1200 | UINTN CpuIndex,\r | |
1201 | UINTN ErrorCode\r | |
1202 | )\r | |
1203 | {\r | |
1204 | UINTN PTIndex;\r | |
1205 | UINTN PFIndex;\r | |
1206 | \r | |
1207 | //\r | |
1208 | // PML4\r | |
1209 | //\r | |
1210 | if (sizeof(UINT64) == sizeof(UINTN)) {\r | |
1211 | PTIndex = (UINTN)BitFieldRead64 (PFAddress, 39, 47);\r | |
1212 | ASSERT (PageTable[PTIndex] != 0);\r | |
1213 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
1214 | }\r | |
1215 | \r | |
1216 | //\r | |
1217 | // PDPTE\r | |
1218 | //\r | |
1219 | PTIndex = (UINTN)BitFieldRead64 (PFAddress, 30, 38);\r | |
1220 | ASSERT (PageTable[PTIndex] != 0);\r | |
1221 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
1222 | \r | |
1223 | //\r | |
1224 | // PD\r | |
1225 | //\r | |
1226 | PTIndex = (UINTN)BitFieldRead64 (PFAddress, 21, 29);\r | |
1227 | if ((PageTable[PTIndex] & IA32_PG_PS) != 0) {\r | |
1228 | //\r | |
1229 | // Large page\r | |
1230 | //\r | |
1231 | \r | |
1232 | //\r | |
1233 | // Record old entries with non-present status\r | |
1234 | // Old entries include the memory which instruction is at and the memory which instruction access.\r | |
1235 | //\r | |
1236 | //\r | |
1237 | ASSERT (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT);\r | |
1238 | if (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT) {\r | |
1239 | PFIndex = mPFEntryCount[CpuIndex];\r | |
1240 | mLastPFEntryValue[CpuIndex][PFIndex] = PageTable[PTIndex];\r | |
1241 | mLastPFEntryPointer[CpuIndex][PFIndex] = &PageTable[PTIndex];\r | |
1242 | mPFEntryCount[CpuIndex]++;\r | |
1243 | }\r | |
1244 | \r | |
1245 | //\r | |
1246 | // Set new entry\r | |
1247 | //\r | |
1248 | PageTable[PTIndex] = (PFAddress & ~((1ull << 21) - 1));\r | |
1249 | PageTable[PTIndex] |= (UINT64)IA32_PG_PS;\r | |
881520ea | 1250 | PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;\r |
529a5a86 MK |
1251 | if ((ErrorCode & IA32_PF_EC_ID) != 0) {\r |
1252 | PageTable[PTIndex] &= ~IA32_PG_NX;\r | |
1253 | }\r | |
1254 | } else {\r | |
1255 | //\r | |
1256 | // Small page\r | |
1257 | //\r | |
1258 | ASSERT (PageTable[PTIndex] != 0);\r | |
1259 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
1260 | \r | |
1261 | //\r | |
1262 | // 4K PTE\r | |
1263 | //\r | |
1264 | PTIndex = (UINTN)BitFieldRead64 (PFAddress, 12, 20);\r | |
1265 | \r | |
1266 | //\r | |
1267 | // Record old entries with non-present status\r | |
1268 | // Old entries include the memory which instruction is at and the memory which instruction access.\r | |
1269 | //\r | |
1270 | //\r | |
1271 | ASSERT (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT);\r | |
1272 | if (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT) {\r | |
1273 | PFIndex = mPFEntryCount[CpuIndex];\r | |
1274 | mLastPFEntryValue[CpuIndex][PFIndex] = PageTable[PTIndex];\r | |
1275 | mLastPFEntryPointer[CpuIndex][PFIndex] = &PageTable[PTIndex];\r | |
1276 | mPFEntryCount[CpuIndex]++;\r | |
1277 | }\r | |
1278 | \r | |
1279 | //\r | |
1280 | // Set new entry\r | |
1281 | //\r | |
1282 | PageTable[PTIndex] = (PFAddress & ~((1ull << 12) - 1));\r | |
881520ea | 1283 | PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;\r |
529a5a86 MK |
1284 | if ((ErrorCode & IA32_PF_EC_ID) != 0) {\r |
1285 | PageTable[PTIndex] &= ~IA32_PG_NX;\r | |
1286 | }\r | |
1287 | }\r | |
1288 | }\r | |
1289 | \r | |
1290 | /**\r | |
1291 | The Page fault handler to save SMM profile data.\r | |
1292 | \r | |
1293 | @param Rip The RIP when exception happens.\r | |
1294 | @param ErrorCode The Error code of exception.\r | |
1295 | \r | |
1296 | **/\r | |
1297 | VOID\r | |
1298 | SmmProfilePFHandler (\r | |
1299 | UINTN Rip,\r | |
1300 | UINTN ErrorCode\r | |
1301 | )\r | |
1302 | {\r | |
1303 | UINT64 *PageTable;\r | |
1304 | UINT64 PFAddress;\r | |
1305 | UINTN CpuIndex;\r | |
1306 | UINTN Index;\r | |
1307 | UINT64 InstructionAddress;\r | |
1308 | UINTN MaxEntryNumber;\r | |
1309 | UINTN CurrentEntryNumber;\r | |
1310 | BOOLEAN IsValidPFAddress;\r | |
1311 | SMM_PROFILE_ENTRY *SmmProfileEntry;\r | |
1312 | UINT64 SmiCommand;\r | |
1313 | EFI_STATUS Status;\r | |
1314 | UINTN SwSmiCpuIndex;\r | |
1315 | UINT8 SoftSmiValue;\r | |
1316 | EFI_SMM_SAVE_STATE_IO_INFO IoInfo;\r | |
1317 | \r | |
1318 | if (!mSmmProfileStart) {\r | |
1319 | //\r | |
1320 | // If SMM profile does not start, call original page fault handler.\r | |
1321 | //\r | |
1322 | SmiDefaultPFHandler ();\r | |
1323 | return;\r | |
1324 | }\r | |
1325 | \r | |
1326 | if (mBtsSupported) {\r | |
1327 | DisableBTS ();\r | |
1328 | }\r | |
1329 | \r | |
1330 | IsValidPFAddress = FALSE;\r | |
1331 | PageTable = (UINT64 *)AsmReadCr3 ();\r | |
1332 | PFAddress = AsmReadCr2 ();\r | |
1333 | CpuIndex = GetCpuIndex ();\r | |
1334 | \r | |
1335 | if (PFAddress <= 0xFFFFFFFF) {\r | |
1336 | RestorePageTableBelow4G (PageTable, PFAddress, CpuIndex, ErrorCode);\r | |
1337 | } else {\r | |
1338 | RestorePageTableAbove4G (PageTable, PFAddress, CpuIndex, ErrorCode, &IsValidPFAddress);\r | |
1339 | }\r | |
1340 | \r | |
1341 | if (!IsValidPFAddress) {\r | |
1342 | InstructionAddress = Rip;\r | |
1343 | if ((ErrorCode & IA32_PF_EC_ID) != 0 && (mBtsSupported)) {\r | |
1344 | //\r | |
1345 | // If it is instruction fetch failure, get the correct IP from BTS.\r | |
1346 | //\r | |
1347 | InstructionAddress = GetSourceFromDestinationOnBts (CpuIndex, Rip);\r | |
1348 | if (InstructionAddress == 0) {\r | |
1349 | //\r | |
1350 | // It indicates the instruction which caused page fault is not a jump instruction,\r | |
1351 | // set instruction address same as the page fault address.\r | |
1352 | //\r | |
1353 | InstructionAddress = PFAddress;\r | |
1354 | }\r | |
1355 | }\r | |
1356 | \r | |
1357 | //\r | |
1358 | // Try to find which CPU trigger SWSMI\r | |
1359 | //\r | |
1360 | SwSmiCpuIndex = 0;\r | |
1361 | //\r | |
1362 | // Indicate it is not software SMI\r | |
1363 | //\r | |
1364 | SmiCommand = 0xFFFFFFFFFFFFFFFFULL;\r | |
1365 | for (Index = 0; Index < gSmst->NumberOfCpus; Index++) {\r | |
1366 | Status = SmmReadSaveState(&mSmmCpu, sizeof(IoInfo), EFI_SMM_SAVE_STATE_REGISTER_IO, Index, &IoInfo);\r | |
1367 | if (EFI_ERROR (Status)) {\r | |
1368 | continue;\r | |
1369 | }\r | |
1370 | if (IoInfo.IoPort == mSmiCommandPort) {\r | |
1371 | //\r | |
1372 | // Great! Find it.\r | |
1373 | //\r | |
1374 | SwSmiCpuIndex = Index;\r | |
1375 | //\r | |
1376 | // A software SMI triggered by SMI command port has been found, get SmiCommand from SMI command port.\r | |
1377 | //\r | |
1378 | SoftSmiValue = IoRead8 (mSmiCommandPort);\r | |
1379 | SmiCommand = (UINT64)SoftSmiValue;\r | |
1380 | break;\r | |
1381 | }\r | |
1382 | }\r | |
1383 | \r | |
1384 | SmmProfileEntry = (SMM_PROFILE_ENTRY *)(UINTN)(mSmmProfileBase + 1);\r | |
1385 | //\r | |
1386 | // Check if there is already a same entry in profile data.\r | |
1387 | //\r | |
1388 | for (Index = 0; Index < (UINTN) mSmmProfileBase->CurDataEntries; Index++) {\r | |
1389 | if ((SmmProfileEntry[Index].ErrorCode == (UINT64)ErrorCode) &&\r | |
1390 | (SmmProfileEntry[Index].Address == PFAddress) &&\r | |
1391 | (SmmProfileEntry[Index].CpuNum == (UINT64)CpuIndex) &&\r | |
1392 | (SmmProfileEntry[Index].Instruction == InstructionAddress) &&\r | |
1393 | (SmmProfileEntry[Index].SmiCmd == SmiCommand)) {\r | |
1394 | //\r | |
1395 | // Same record exist, need not save again.\r | |
1396 | //\r | |
1397 | break;\r | |
1398 | }\r | |
1399 | }\r | |
1400 | if (Index == mSmmProfileBase->CurDataEntries) {\r | |
1401 | CurrentEntryNumber = (UINTN) mSmmProfileBase->CurDataEntries;\r | |
1402 | MaxEntryNumber = (UINTN) mSmmProfileBase->MaxDataEntries;\r | |
1403 | if (FeaturePcdGet (PcdCpuSmmProfileRingBuffer)) {\r | |
1404 | CurrentEntryNumber = CurrentEntryNumber % MaxEntryNumber;\r | |
1405 | }\r | |
1406 | if (CurrentEntryNumber < MaxEntryNumber) {\r | |
1407 | //\r | |
1408 | // Log the new entry\r | |
1409 | //\r | |
1410 | SmmProfileEntry[CurrentEntryNumber].SmiNum = mSmmProfileBase->NumSmis;\r | |
1411 | SmmProfileEntry[CurrentEntryNumber].ErrorCode = (UINT64)ErrorCode;\r | |
1412 | SmmProfileEntry[CurrentEntryNumber].ApicId = (UINT64)GetApicId ();\r | |
1413 | SmmProfileEntry[CurrentEntryNumber].CpuNum = (UINT64)CpuIndex;\r | |
1414 | SmmProfileEntry[CurrentEntryNumber].Address = PFAddress;\r | |
1415 | SmmProfileEntry[CurrentEntryNumber].Instruction = InstructionAddress;\r | |
1416 | SmmProfileEntry[CurrentEntryNumber].SmiCmd = SmiCommand;\r | |
1417 | //\r | |
1418 | // Update current entry index and data size in the header.\r | |
1419 | //\r | |
1420 | mSmmProfileBase->CurDataEntries++;\r | |
1421 | mSmmProfileBase->CurDataSize = MultU64x64 (mSmmProfileBase->CurDataEntries, sizeof (SMM_PROFILE_ENTRY));\r | |
1422 | }\r | |
1423 | }\r | |
1424 | }\r | |
1425 | //\r | |
1426 | // Flush TLB\r | |
1427 | //\r | |
1428 | CpuFlushTlb ();\r | |
1429 | \r | |
1430 | if (mBtsSupported) {\r | |
1431 | EnableBTS ();\r | |
1432 | }\r | |
1433 | }\r | |
1434 | \r | |
1435 | /**\r | |
1436 | Replace INT1 exception handler to restore page table to absent/execute-disable state\r | |
1437 | in order to trigger page fault again to save SMM profile data..\r | |
1438 | \r | |
1439 | **/\r | |
1440 | VOID\r | |
1441 | InitIdtr (\r | |
1442 | VOID\r | |
1443 | )\r | |
1444 | {\r | |
1445 | SmmRegisterExceptionHandler (&mSmmCpuService, EXCEPT_IA32_DEBUG, DebugExceptionHandler);\r | |
1446 | }\r |