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Commit | Line | Data |
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22292ed3 JY |
1 | /** @file\r |
2 | Page table management support.\r | |
3 | \r | |
29355b4e | 4 | Copyright (c) 2017 - 2019, Intel Corporation. All rights reserved.<BR>\r |
627dcba3 LD |
5 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r |
6 | \r | |
0acd8697 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
22292ed3 JY |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <Base.h>\r | |
12 | #include <Uefi.h>\r | |
dcc02621 JW |
13 | #include <Library/PeCoffGetEntryPointLib.h>\r |
14 | #include <Library/SerialPortLib.h>\r | |
15 | #include <Library/SynchronizationLib.h>\r | |
16 | #include <Library/PrintLib.h>\r | |
2a1408d1 | 17 | #include <Protocol/SmmBase2.h>\r |
01acb06c RN |
18 | #include <Register/Intel/Cpuid.h>\r |
19 | #include <Register/Intel/Msr.h>\r | |
c1cab54c JW |
20 | \r |
21 | #include "CpuDxe.h"\r | |
22292ed3 JY |
22 | #include "CpuPageTable.h"\r |
23 | \r | |
24 | ///\r | |
25 | /// Page Table Entry\r | |
26 | ///\r | |
053e878b MK |
27 | #define IA32_PG_P BIT0\r |
28 | #define IA32_PG_RW BIT1\r | |
29 | #define IA32_PG_U BIT2\r | |
30 | #define IA32_PG_WT BIT3\r | |
31 | #define IA32_PG_CD BIT4\r | |
32 | #define IA32_PG_A BIT5\r | |
33 | #define IA32_PG_D BIT6\r | |
34 | #define IA32_PG_PS BIT7\r | |
35 | #define IA32_PG_PAT_2M BIT12\r | |
36 | #define IA32_PG_PAT_4K IA32_PG_PS\r | |
37 | #define IA32_PG_PMNT BIT62\r | |
38 | #define IA32_PG_NX BIT63\r | |
39 | \r | |
40 | #define PAGE_ATTRIBUTE_BITS (IA32_PG_D | IA32_PG_A | IA32_PG_U | IA32_PG_RW | IA32_PG_P)\r | |
22292ed3 JY |
41 | //\r |
42 | // Bits 1, 2, 5, 6 are reserved in the IA32 PAE PDPTE\r | |
43 | // X64 PAE PDPTE does not have such restriction\r | |
44 | //\r | |
053e878b | 45 | #define IA32_PAE_PDPTE_ATTRIBUTE_BITS (IA32_PG_P)\r |
22292ed3 | 46 | \r |
053e878b | 47 | #define PAGE_PROGATE_BITS (IA32_PG_NX | PAGE_ATTRIBUTE_BITS)\r |
22292ed3 JY |
48 | \r |
49 | #define PAGING_4K_MASK 0xFFF\r | |
50 | #define PAGING_2M_MASK 0x1FFFFF\r | |
51 | #define PAGING_1G_MASK 0x3FFFFFFF\r | |
52 | \r | |
53 | #define PAGING_PAE_INDEX_MASK 0x1FF\r | |
54 | \r | |
053e878b MK |
55 | #define PAGING_4K_ADDRESS_MASK_64 0x000FFFFFFFFFF000ull\r |
56 | #define PAGING_2M_ADDRESS_MASK_64 0x000FFFFFFFE00000ull\r | |
57 | #define PAGING_1G_ADDRESS_MASK_64 0x000FFFFFC0000000ull\r | |
22292ed3 | 58 | \r |
dcc02621 JW |
59 | #define MAX_PF_ENTRY_COUNT 10\r |
60 | #define MAX_DEBUG_MESSAGE_LENGTH 0x100\r | |
61 | #define IA32_PF_EC_ID BIT4\r | |
62 | \r | |
22292ed3 JY |
63 | typedef enum {\r |
64 | PageNone,\r | |
65 | Page4K,\r | |
66 | Page2M,\r | |
67 | Page1G,\r | |
68 | } PAGE_ATTRIBUTE;\r | |
69 | \r | |
70 | typedef struct {\r | |
053e878b MK |
71 | PAGE_ATTRIBUTE Attribute;\r |
72 | UINT64 Length;\r | |
73 | UINT64 AddressMask;\r | |
22292ed3 JY |
74 | } PAGE_ATTRIBUTE_TABLE;\r |
75 | \r | |
76 | typedef enum {\r | |
77 | PageActionAssign,\r | |
78 | PageActionSet,\r | |
79 | PageActionClear,\r | |
80 | } PAGE_ACTION;\r | |
81 | \r | |
053e878b MK |
82 | PAGE_ATTRIBUTE_TABLE mPageAttributeTable[] = {\r |
83 | { Page4K, SIZE_4KB, PAGING_4K_ADDRESS_MASK_64 },\r | |
84 | { Page2M, SIZE_2MB, PAGING_2M_ADDRESS_MASK_64 },\r | |
85 | { Page1G, SIZE_1GB, PAGING_1G_ADDRESS_MASK_64 },\r | |
22292ed3 JY |
86 | };\r |
87 | \r | |
053e878b MK |
88 | PAGE_TABLE_POOL *mPageTablePool = NULL;\r |
89 | BOOLEAN mPageTablePoolLock = FALSE;\r | |
90 | PAGE_TABLE_LIB_PAGING_CONTEXT mPagingContext;\r | |
91 | EFI_SMM_BASE2_PROTOCOL *mSmmBase2 = NULL;\r | |
2a1408d1 | 92 | \r |
dcc02621 JW |
93 | //\r |
94 | // Record the page fault exception count for one instruction execution.\r | |
95 | //\r | |
053e878b | 96 | UINTN *mPFEntryCount;\r |
dcc02621 JW |
97 | UINT64 *(*mLastPFEntryPointer)[MAX_PF_ENTRY_COUNT];\r |
98 | \r | |
2a1408d1 JW |
99 | /**\r |
100 | Check if current execution environment is in SMM mode or not, via\r | |
101 | EFI_SMM_BASE2_PROTOCOL.\r | |
102 | \r | |
103 | This is necessary because of the fact that MdePkg\Library\SmmMemoryAllocationLib\r | |
104 | supports to free memory outside SMRAM. The library will call gBS->FreePool() or\r | |
105 | gBS->FreePages() and then SetMemorySpaceAttributes interface in turn to change\r | |
106 | memory paging attributes during free operation, if some memory related features\r | |
107 | are enabled (like Heap Guard).\r | |
108 | \r | |
109 | This means that SetMemorySpaceAttributes() has chance to run in SMM mode. This\r | |
110 | will cause incorrect result because SMM mode always loads its own page tables,\r | |
111 | which are usually different from DXE. This function can be used to detect such\r | |
112 | situation and help to avoid further misoperations.\r | |
113 | \r | |
114 | @retval TRUE In SMM mode.\r | |
115 | @retval FALSE Not in SMM mode.\r | |
116 | **/\r | |
117 | BOOLEAN\r | |
118 | IsInSmm (\r | |
119 | VOID\r | |
120 | )\r | |
121 | {\r | |
053e878b | 122 | BOOLEAN InSmm;\r |
2a1408d1 JW |
123 | \r |
124 | InSmm = FALSE;\r | |
125 | if (mSmmBase2 == NULL) {\r | |
126 | gBS->LocateProtocol (&gEfiSmmBase2ProtocolGuid, NULL, (VOID **)&mSmmBase2);\r | |
127 | }\r | |
128 | \r | |
129 | if (mSmmBase2 != NULL) {\r | |
130 | mSmmBase2->InSmm (mSmmBase2, &InSmm);\r | |
131 | }\r | |
132 | \r | |
b72f4873 JW |
133 | //\r |
134 | // mSmmBase2->InSmm() can only detect if the caller is running in SMRAM\r | |
135 | // or from SMM driver. It cannot tell if the caller is running in SMM mode.\r | |
136 | // Check page table base address to guarantee that because SMM mode willl\r | |
137 | // load its own page table.\r | |
138 | //\r | |
139 | return (InSmm &&\r | |
053e878b | 140 | mPagingContext.ContextData.X64.PageTableBase != (UINT64)AsmReadCr3 ());\r |
2a1408d1 | 141 | }\r |
147fd35c | 142 | \r |
22292ed3 JY |
143 | /**\r |
144 | Return current paging context.\r | |
145 | \r | |
146 | @param[in,out] PagingContext The paging context.\r | |
147 | **/\r | |
148 | VOID\r | |
149 | GetCurrentPagingContext (\r | |
053e878b | 150 | IN OUT PAGE_TABLE_LIB_PAGING_CONTEXT *PagingContext\r |
22292ed3 JY |
151 | )\r |
152 | {\r | |
053e878b MK |
153 | UINT32 RegEax;\r |
154 | CPUID_EXTENDED_CPU_SIG_EDX RegEdx;\r | |
155 | MSR_IA32_EFER_REGISTER MsrEfer;\r | |
156 | IA32_CR4 Cr4;\r | |
157 | IA32_CR0 Cr0;\r | |
158 | UINT32 *Attributes;\r | |
159 | UINTN *PageTableBase;\r | |
22292ed3 | 160 | \r |
2a1408d1 JW |
161 | //\r |
162 | // Don't retrieve current paging context from processor if in SMM mode.\r | |
163 | //\r | |
164 | if (!IsInSmm ()) {\r | |
053e878b MK |
165 | ZeroMem (&mPagingContext, sizeof (mPagingContext));\r |
166 | if (sizeof (UINTN) == sizeof (UINT64)) {\r | |
2a1408d1 JW |
167 | mPagingContext.MachineType = IMAGE_FILE_MACHINE_X64;\r |
168 | } else {\r | |
169 | mPagingContext.MachineType = IMAGE_FILE_MACHINE_I386;\r | |
170 | }\r | |
29355b4e | 171 | \r |
c70fef96 ED |
172 | GetPagingDetails (&mPagingContext.ContextData, &PageTableBase, &Attributes);\r |
173 | \r | |
29355b4e RN |
174 | Cr0.UintN = AsmReadCr0 ();\r |
175 | Cr4.UintN = AsmReadCr4 ();\r | |
176 | \r | |
177 | if (Cr0.Bits.PG != 0) {\r | |
c70fef96 | 178 | *PageTableBase = (AsmReadCr3 () & PAGING_4K_ADDRESS_MASK_64);\r |
2a1408d1 | 179 | } else {\r |
c70fef96 | 180 | *PageTableBase = 0;\r |
2a1408d1 | 181 | }\r |
053e878b | 182 | \r |
29355b4e | 183 | if (Cr0.Bits.WP != 0) {\r |
c70fef96 | 184 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_WP_ENABLE;\r |
29355b4e | 185 | }\r |
053e878b | 186 | \r |
29355b4e | 187 | if (Cr4.Bits.PSE != 0) {\r |
c70fef96 | 188 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PSE;\r |
2a1408d1 | 189 | }\r |
053e878b | 190 | \r |
29355b4e | 191 | if (Cr4.Bits.PAE != 0) {\r |
c70fef96 | 192 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAE;\r |
2a1408d1 | 193 | }\r |
053e878b | 194 | \r |
e58aa474 | 195 | if (Cr4.Bits.LA57 != 0) {\r |
c70fef96 | 196 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_5_LEVEL;\r |
e58aa474 | 197 | }\r |
22292ed3 | 198 | \r |
d106cf71 JW |
199 | AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL);\r |
200 | if (RegEax >= CPUID_EXTENDED_CPU_SIG) {\r | |
201 | AsmCpuid (CPUID_EXTENDED_CPU_SIG, NULL, NULL, NULL, &RegEdx.Uint32);\r | |
202 | \r | |
203 | if (RegEdx.Bits.NX != 0) {\r | |
2a1408d1 | 204 | // XD supported\r |
053e878b | 205 | MsrEfer.Uint64 = AsmReadMsr64 (MSR_CORE_IA32_EFER);\r |
d106cf71 | 206 | if (MsrEfer.Bits.NXE != 0) {\r |
2a1408d1 | 207 | // XD activated\r |
c70fef96 | 208 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_XD_ACTIVATED;\r |
2a1408d1 JW |
209 | }\r |
210 | }\r | |
d106cf71 JW |
211 | \r |
212 | if (RegEdx.Bits.Page1GB != 0) {\r | |
c70fef96 | 213 | *Attributes |= PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAGE_1G_SUPPORT;\r |
22292ed3 | 214 | }\r |
22292ed3 JY |
215 | }\r |
216 | }\r | |
2a1408d1 JW |
217 | \r |
218 | //\r | |
219 | // This can avoid getting SMM paging context if in SMM mode. We cannot assume\r | |
220 | // SMM mode shares the same paging context as DXE.\r | |
221 | //\r | |
222 | CopyMem (PagingContext, &mPagingContext, sizeof (mPagingContext));\r | |
22292ed3 JY |
223 | }\r |
224 | \r | |
225 | /**\r | |
226 | Return length according to page attributes.\r | |
227 | \r | |
228 | @param[in] PageAttributes The page attribute of the page entry.\r | |
229 | \r | |
230 | @return The length of page entry.\r | |
231 | **/\r | |
232 | UINTN\r | |
233 | PageAttributeToLength (\r | |
234 | IN PAGE_ATTRIBUTE PageAttribute\r | |
235 | )\r | |
236 | {\r | |
237 | UINTN Index;\r | |
053e878b MK |
238 | \r |
239 | for (Index = 0; Index < sizeof (mPageAttributeTable)/sizeof (mPageAttributeTable[0]); Index++) {\r | |
22292ed3 JY |
240 | if (PageAttribute == mPageAttributeTable[Index].Attribute) {\r |
241 | return (UINTN)mPageAttributeTable[Index].Length;\r | |
242 | }\r | |
243 | }\r | |
053e878b | 244 | \r |
22292ed3 JY |
245 | return 0;\r |
246 | }\r | |
247 | \r | |
248 | /**\r | |
249 | Return address mask according to page attributes.\r | |
250 | \r | |
251 | @param[in] PageAttributes The page attribute of the page entry.\r | |
252 | \r | |
253 | @return The address mask of page entry.\r | |
254 | **/\r | |
255 | UINTN\r | |
256 | PageAttributeToMask (\r | |
257 | IN PAGE_ATTRIBUTE PageAttribute\r | |
258 | )\r | |
259 | {\r | |
260 | UINTN Index;\r | |
053e878b MK |
261 | \r |
262 | for (Index = 0; Index < sizeof (mPageAttributeTable)/sizeof (mPageAttributeTable[0]); Index++) {\r | |
22292ed3 JY |
263 | if (PageAttribute == mPageAttributeTable[Index].Attribute) {\r |
264 | return (UINTN)mPageAttributeTable[Index].AddressMask;\r | |
265 | }\r | |
266 | }\r | |
053e878b | 267 | \r |
22292ed3 JY |
268 | return 0;\r |
269 | }\r | |
270 | \r | |
271 | /**\r | |
272 | Return page table entry to match the address.\r | |
273 | \r | |
274 | @param[in] PagingContext The paging context.\r | |
275 | @param[in] Address The address to be checked.\r | |
276 | @param[out] PageAttributes The page attribute of the page entry.\r | |
277 | \r | |
278 | @return The page entry.\r | |
279 | **/\r | |
280 | VOID *\r | |
281 | GetPageTableEntry (\r | |
053e878b MK |
282 | IN PAGE_TABLE_LIB_PAGING_CONTEXT *PagingContext,\r |
283 | IN PHYSICAL_ADDRESS Address,\r | |
284 | OUT PAGE_ATTRIBUTE *PageAttribute\r | |
22292ed3 JY |
285 | )\r |
286 | {\r | |
053e878b MK |
287 | UINTN Index1;\r |
288 | UINTN Index2;\r | |
289 | UINTN Index3;\r | |
290 | UINTN Index4;\r | |
291 | UINTN Index5;\r | |
292 | UINT64 *L1PageTable;\r | |
293 | UINT64 *L2PageTable;\r | |
294 | UINT64 *L3PageTable;\r | |
295 | UINT64 *L4PageTable;\r | |
296 | UINT64 *L5PageTable;\r | |
297 | UINT64 AddressEncMask;\r | |
22292ed3 JY |
298 | \r |
299 | ASSERT (PagingContext != NULL);\r | |
300 | \r | |
e58aa474 | 301 | Index5 = ((UINTN)RShiftU64 (Address, 48)) & PAGING_PAE_INDEX_MASK;\r |
22292ed3 JY |
302 | Index4 = ((UINTN)RShiftU64 (Address, 39)) & PAGING_PAE_INDEX_MASK;\r |
303 | Index3 = ((UINTN)Address >> 30) & PAGING_PAE_INDEX_MASK;\r | |
304 | Index2 = ((UINTN)Address >> 21) & PAGING_PAE_INDEX_MASK;\r | |
305 | Index1 = ((UINTN)Address >> 12) & PAGING_PAE_INDEX_MASK;\r | |
306 | \r | |
627dcba3 LD |
307 | // Make sure AddressEncMask is contained to smallest supported address field.\r |
308 | //\r | |
309 | AddressEncMask = PcdGet64 (PcdPteMemoryEncryptionAddressOrMask) & PAGING_1G_ADDRESS_MASK_64;\r | |
cc3620f3 MX |
310 | if (AddressEncMask == 0) {\r |
311 | AddressEncMask = PcdGet64 (PcdTdxSharedBitMask) & PAGING_1G_ADDRESS_MASK_64;\r | |
312 | }\r | |
627dcba3 | 313 | \r |
22292ed3 | 314 | if (PagingContext->MachineType == IMAGE_FILE_MACHINE_X64) {\r |
e58aa474 RN |
315 | if ((PagingContext->ContextData.X64.Attributes & PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_5_LEVEL) != 0) {\r |
316 | L5PageTable = (UINT64 *)(UINTN)PagingContext->ContextData.X64.PageTableBase;\r | |
317 | if (L5PageTable[Index5] == 0) {\r | |
318 | *PageAttribute = PageNone;\r | |
319 | return NULL;\r | |
320 | }\r | |
321 | \r | |
322 | L4PageTable = (UINT64 *)(UINTN)(L5PageTable[Index5] & ~AddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r | |
323 | } else {\r | |
324 | L4PageTable = (UINT64 *)(UINTN)PagingContext->ContextData.X64.PageTableBase;\r | |
325 | }\r | |
053e878b | 326 | \r |
22292ed3 JY |
327 | if (L4PageTable[Index4] == 0) {\r |
328 | *PageAttribute = PageNone;\r | |
329 | return NULL;\r | |
330 | }\r | |
331 | \r | |
627dcba3 | 332 | L3PageTable = (UINT64 *)(UINTN)(L4PageTable[Index4] & ~AddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r |
22292ed3 | 333 | } else {\r |
053e878b | 334 | ASSERT ((PagingContext->ContextData.Ia32.Attributes & PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAE) != 0);\r |
22292ed3 JY |
335 | L3PageTable = (UINT64 *)(UINTN)PagingContext->ContextData.Ia32.PageTableBase;\r |
336 | }\r | |
053e878b | 337 | \r |
22292ed3 JY |
338 | if (L3PageTable[Index3] == 0) {\r |
339 | *PageAttribute = PageNone;\r | |
340 | return NULL;\r | |
341 | }\r | |
053e878b | 342 | \r |
22292ed3 JY |
343 | if ((L3PageTable[Index3] & IA32_PG_PS) != 0) {\r |
344 | // 1G\r | |
345 | *PageAttribute = Page1G;\r | |
346 | return &L3PageTable[Index3];\r | |
347 | }\r | |
348 | \r | |
627dcba3 | 349 | L2PageTable = (UINT64 *)(UINTN)(L3PageTable[Index3] & ~AddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r |
22292ed3 JY |
350 | if (L2PageTable[Index2] == 0) {\r |
351 | *PageAttribute = PageNone;\r | |
352 | return NULL;\r | |
353 | }\r | |
053e878b | 354 | \r |
22292ed3 JY |
355 | if ((L2PageTable[Index2] & IA32_PG_PS) != 0) {\r |
356 | // 2M\r | |
357 | *PageAttribute = Page2M;\r | |
358 | return &L2PageTable[Index2];\r | |
359 | }\r | |
360 | \r | |
361 | // 4k\r | |
627dcba3 | 362 | L1PageTable = (UINT64 *)(UINTN)(L2PageTable[Index2] & ~AddressEncMask & PAGING_4K_ADDRESS_MASK_64);\r |
22292ed3 JY |
363 | if ((L1PageTable[Index1] == 0) && (Address != 0)) {\r |
364 | *PageAttribute = PageNone;\r | |
365 | return NULL;\r | |
366 | }\r | |
053e878b | 367 | \r |
22292ed3 JY |
368 | *PageAttribute = Page4K;\r |
369 | return &L1PageTable[Index1];\r | |
370 | }\r | |
371 | \r | |
372 | /**\r | |
373 | Return memory attributes of page entry.\r | |
374 | \r | |
375 | @param[in] PageEntry The page entry.\r | |
376 | \r | |
377 | @return Memory attributes of page entry.\r | |
378 | **/\r | |
379 | UINT64\r | |
380 | GetAttributesFromPageEntry (\r | |
053e878b | 381 | IN UINT64 *PageEntry\r |
22292ed3 JY |
382 | )\r |
383 | {\r | |
384 | UINT64 Attributes;\r | |
053e878b | 385 | \r |
22292ed3 JY |
386 | Attributes = 0;\r |
387 | if ((*PageEntry & IA32_PG_P) == 0) {\r | |
388 | Attributes |= EFI_MEMORY_RP;\r | |
389 | }\r | |
053e878b | 390 | \r |
22292ed3 JY |
391 | if ((*PageEntry & IA32_PG_RW) == 0) {\r |
392 | Attributes |= EFI_MEMORY_RO;\r | |
393 | }\r | |
053e878b | 394 | \r |
22292ed3 JY |
395 | if ((*PageEntry & IA32_PG_NX) != 0) {\r |
396 | Attributes |= EFI_MEMORY_XP;\r | |
397 | }\r | |
053e878b | 398 | \r |
22292ed3 JY |
399 | return Attributes;\r |
400 | }\r | |
401 | \r | |
402 | /**\r | |
403 | Modify memory attributes of page entry.\r | |
404 | \r | |
405 | @param[in] PagingContext The paging context.\r | |
406 | @param[in] PageEntry The page entry.\r | |
407 | @param[in] Attributes The bit mask of attributes to modify for the memory region.\r | |
408 | @param[in] PageAction The page action.\r | |
409 | @param[out] IsModified TRUE means page table modified. FALSE means page table not modified.\r | |
410 | **/\r | |
411 | VOID\r | |
412 | ConvertPageEntryAttribute (\r | |
053e878b MK |
413 | IN PAGE_TABLE_LIB_PAGING_CONTEXT *PagingContext,\r |
414 | IN UINT64 *PageEntry,\r | |
415 | IN UINT64 Attributes,\r | |
416 | IN PAGE_ACTION PageAction,\r | |
417 | OUT BOOLEAN *IsModified\r | |
22292ed3 JY |
418 | )\r |
419 | {\r | |
420 | UINT64 CurrentPageEntry;\r | |
421 | UINT64 NewPageEntry;\r | |
c70fef96 | 422 | UINT32 *PageAttributes;\r |
22292ed3 JY |
423 | \r |
424 | CurrentPageEntry = *PageEntry;\r | |
053e878b | 425 | NewPageEntry = CurrentPageEntry;\r |
22292ed3 JY |
426 | if ((Attributes & EFI_MEMORY_RP) != 0) {\r |
427 | switch (PageAction) {\r | |
053e878b MK |
428 | case PageActionAssign:\r |
429 | case PageActionSet:\r | |
430 | NewPageEntry &= ~(UINT64)IA32_PG_P;\r | |
431 | break;\r | |
432 | case PageActionClear:\r | |
433 | NewPageEntry |= IA32_PG_P;\r | |
434 | break;\r | |
22292ed3 JY |
435 | }\r |
436 | } else {\r | |
437 | switch (PageAction) {\r | |
053e878b MK |
438 | case PageActionAssign:\r |
439 | NewPageEntry |= IA32_PG_P;\r | |
440 | break;\r | |
441 | case PageActionSet:\r | |
442 | case PageActionClear:\r | |
443 | break;\r | |
22292ed3 JY |
444 | }\r |
445 | }\r | |
053e878b | 446 | \r |
22292ed3 JY |
447 | if ((Attributes & EFI_MEMORY_RO) != 0) {\r |
448 | switch (PageAction) {\r | |
053e878b MK |
449 | case PageActionAssign:\r |
450 | case PageActionSet:\r | |
451 | NewPageEntry &= ~(UINT64)IA32_PG_RW;\r | |
452 | break;\r | |
453 | case PageActionClear:\r | |
454 | NewPageEntry |= IA32_PG_RW;\r | |
455 | break;\r | |
22292ed3 JY |
456 | }\r |
457 | } else {\r | |
458 | switch (PageAction) {\r | |
053e878b MK |
459 | case PageActionAssign:\r |
460 | NewPageEntry |= IA32_PG_RW;\r | |
461 | break;\r | |
462 | case PageActionSet:\r | |
463 | case PageActionClear:\r | |
464 | break;\r | |
22292ed3 JY |
465 | }\r |
466 | }\r | |
c70fef96 ED |
467 | \r |
468 | GetPagingDetails (&PagingContext->ContextData, NULL, &PageAttributes);\r | |
469 | \r | |
470 | if ((*PageAttributes & PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_XD_ACTIVATED) != 0) {\r | |
22292ed3 JY |
471 | if ((Attributes & EFI_MEMORY_XP) != 0) {\r |
472 | switch (PageAction) {\r | |
053e878b MK |
473 | case PageActionAssign:\r |
474 | case PageActionSet:\r | |
475 | NewPageEntry |= IA32_PG_NX;\r | |
476 | break;\r | |
477 | case PageActionClear:\r | |
478 | NewPageEntry &= ~IA32_PG_NX;\r | |
479 | break;\r | |
22292ed3 JY |
480 | }\r |
481 | } else {\r | |
482 | switch (PageAction) {\r | |
053e878b MK |
483 | case PageActionAssign:\r |
484 | NewPageEntry &= ~IA32_PG_NX;\r | |
485 | break;\r | |
486 | case PageActionSet:\r | |
487 | case PageActionClear:\r | |
488 | break;\r | |
22292ed3 JY |
489 | }\r |
490 | }\r | |
491 | }\r | |
053e878b | 492 | \r |
22292ed3 JY |
493 | *PageEntry = NewPageEntry;\r |
494 | if (CurrentPageEntry != NewPageEntry) {\r | |
495 | *IsModified = TRUE;\r | |
827330cc JW |
496 | DEBUG ((DEBUG_VERBOSE, "ConvertPageEntryAttribute 0x%lx", CurrentPageEntry));\r |
497 | DEBUG ((DEBUG_VERBOSE, "->0x%lx\n", NewPageEntry));\r | |
22292ed3 JY |
498 | } else {\r |
499 | *IsModified = FALSE;\r | |
500 | }\r | |
501 | }\r | |
502 | \r | |
503 | /**\r | |
504 | This function returns if there is need to split page entry.\r | |
505 | \r | |
506 | @param[in] BaseAddress The base address to be checked.\r | |
507 | @param[in] Length The length to be checked.\r | |
508 | @param[in] PageEntry The page entry to be checked.\r | |
509 | @param[in] PageAttribute The page attribute of the page entry.\r | |
510 | \r | |
511 | @retval SplitAttributes on if there is need to split page entry.\r | |
512 | **/\r | |
513 | PAGE_ATTRIBUTE\r | |
514 | NeedSplitPage (\r | |
053e878b MK |
515 | IN PHYSICAL_ADDRESS BaseAddress,\r |
516 | IN UINT64 Length,\r | |
517 | IN UINT64 *PageEntry,\r | |
518 | IN PAGE_ATTRIBUTE PageAttribute\r | |
22292ed3 JY |
519 | )\r |
520 | {\r | |
053e878b | 521 | UINT64 PageEntryLength;\r |
22292ed3 JY |
522 | \r |
523 | PageEntryLength = PageAttributeToLength (PageAttribute);\r | |
524 | \r | |
525 | if (((BaseAddress & (PageEntryLength - 1)) == 0) && (Length >= PageEntryLength)) {\r | |
526 | return PageNone;\r | |
527 | }\r | |
528 | \r | |
529 | if (((BaseAddress & PAGING_2M_MASK) != 0) || (Length < SIZE_2MB)) {\r | |
530 | return Page4K;\r | |
531 | }\r | |
532 | \r | |
533 | return Page2M;\r | |
534 | }\r | |
535 | \r | |
536 | /**\r | |
537 | This function splits one page entry to small page entries.\r | |
538 | \r | |
539 | @param[in] PageEntry The page entry to be splitted.\r | |
540 | @param[in] PageAttribute The page attribute of the page entry.\r | |
541 | @param[in] SplitAttribute How to split the page entry.\r | |
542 | @param[in] AllocatePagesFunc If page split is needed, this function is used to allocate more pages.\r | |
543 | \r | |
544 | @retval RETURN_SUCCESS The page entry is splitted.\r | |
545 | @retval RETURN_UNSUPPORTED The page entry does not support to be splitted.\r | |
546 | @retval RETURN_OUT_OF_RESOURCES No resource to split page entry.\r | |
547 | **/\r | |
548 | RETURN_STATUS\r | |
549 | SplitPage (\r | |
053e878b MK |
550 | IN UINT64 *PageEntry,\r |
551 | IN PAGE_ATTRIBUTE PageAttribute,\r | |
552 | IN PAGE_ATTRIBUTE SplitAttribute,\r | |
553 | IN PAGE_TABLE_LIB_ALLOCATE_PAGES AllocatePagesFunc\r | |
22292ed3 JY |
554 | )\r |
555 | {\r | |
053e878b MK |
556 | UINT64 BaseAddress;\r |
557 | UINT64 *NewPageEntry;\r | |
558 | UINTN Index;\r | |
559 | UINT64 AddressEncMask;\r | |
22292ed3 JY |
560 | \r |
561 | ASSERT (PageAttribute == Page2M || PageAttribute == Page1G);\r | |
562 | \r | |
563 | ASSERT (AllocatePagesFunc != NULL);\r | |
564 | \r | |
627dcba3 LD |
565 | // Make sure AddressEncMask is contained to smallest supported address field.\r |
566 | //\r | |
567 | AddressEncMask = PcdGet64 (PcdPteMemoryEncryptionAddressOrMask) & PAGING_1G_ADDRESS_MASK_64;\r | |
568 | \r | |
22292ed3 JY |
569 | if (PageAttribute == Page2M) {\r |
570 | //\r | |
571 | // Split 2M to 4K\r | |
572 | //\r | |
573 | ASSERT (SplitAttribute == Page4K);\r | |
574 | if (SplitAttribute == Page4K) {\r | |
575 | NewPageEntry = AllocatePagesFunc (1);\r | |
7c7c8190 | 576 | DEBUG ((DEBUG_VERBOSE, "Split - 0x%x\n", NewPageEntry));\r |
22292ed3 JY |
577 | if (NewPageEntry == NULL) {\r |
578 | return RETURN_OUT_OF_RESOURCES;\r | |
579 | }\r | |
053e878b | 580 | \r |
627dcba3 | 581 | BaseAddress = *PageEntry & ~AddressEncMask & PAGING_2M_ADDRESS_MASK_64;\r |
053e878b | 582 | for (Index = 0; Index < SIZE_4KB / sizeof (UINT64); Index++) {\r |
627dcba3 | 583 | NewPageEntry[Index] = (BaseAddress + SIZE_4KB * Index) | AddressEncMask | ((*PageEntry) & PAGE_PROGATE_BITS);\r |
22292ed3 | 584 | }\r |
053e878b | 585 | \r |
fbe2c4b9 | 586 | (*PageEntry) = (UINT64)(UINTN)NewPageEntry | AddressEncMask | ((*PageEntry) & PAGE_ATTRIBUTE_BITS);\r |
22292ed3 JY |
587 | return RETURN_SUCCESS;\r |
588 | } else {\r | |
589 | return RETURN_UNSUPPORTED;\r | |
590 | }\r | |
591 | } else if (PageAttribute == Page1G) {\r | |
592 | //\r | |
593 | // Split 1G to 2M\r | |
594 | // No need support 1G->4K directly, we should use 1G->2M, then 2M->4K to get more compact page table.\r | |
595 | //\r | |
596 | ASSERT (SplitAttribute == Page2M || SplitAttribute == Page4K);\r | |
053e878b | 597 | if (((SplitAttribute == Page2M) || (SplitAttribute == Page4K))) {\r |
22292ed3 | 598 | NewPageEntry = AllocatePagesFunc (1);\r |
7c7c8190 | 599 | DEBUG ((DEBUG_VERBOSE, "Split - 0x%x\n", NewPageEntry));\r |
22292ed3 JY |
600 | if (NewPageEntry == NULL) {\r |
601 | return RETURN_OUT_OF_RESOURCES;\r | |
602 | }\r | |
053e878b | 603 | \r |
627dcba3 | 604 | BaseAddress = *PageEntry & ~AddressEncMask & PAGING_1G_ADDRESS_MASK_64;\r |
053e878b | 605 | for (Index = 0; Index < SIZE_4KB / sizeof (UINT64); Index++) {\r |
627dcba3 | 606 | NewPageEntry[Index] = (BaseAddress + SIZE_2MB * Index) | AddressEncMask | IA32_PG_PS | ((*PageEntry) & PAGE_PROGATE_BITS);\r |
22292ed3 | 607 | }\r |
053e878b | 608 | \r |
fbe2c4b9 | 609 | (*PageEntry) = (UINT64)(UINTN)NewPageEntry | AddressEncMask | ((*PageEntry) & PAGE_ATTRIBUTE_BITS);\r |
22292ed3 JY |
610 | return RETURN_SUCCESS;\r |
611 | } else {\r | |
612 | return RETURN_UNSUPPORTED;\r | |
613 | }\r | |
614 | } else {\r | |
615 | return RETURN_UNSUPPORTED;\r | |
616 | }\r | |
617 | }\r | |
618 | \r | |
147fd35c JW |
619 | /**\r |
620 | Check the WP status in CR0 register. This bit is used to lock or unlock write\r | |
621 | access to pages marked as read-only.\r | |
622 | \r | |
623 | @retval TRUE Write protection is enabled.\r | |
624 | @retval FALSE Write protection is disabled.\r | |
625 | **/\r | |
626 | BOOLEAN\r | |
627 | IsReadOnlyPageWriteProtected (\r | |
628 | VOID\r | |
629 | )\r | |
630 | {\r | |
29355b4e | 631 | IA32_CR0 Cr0;\r |
053e878b | 632 | \r |
2a1408d1 JW |
633 | //\r |
634 | // To avoid unforseen consequences, don't touch paging settings in SMM mode\r | |
635 | // in this driver.\r | |
636 | //\r | |
637 | if (!IsInSmm ()) {\r | |
29355b4e | 638 | Cr0.UintN = AsmReadCr0 ();\r |
053e878b | 639 | return (BOOLEAN)(Cr0.Bits.WP != 0);\r |
2a1408d1 | 640 | }\r |
053e878b | 641 | \r |
2a1408d1 | 642 | return FALSE;\r |
147fd35c JW |
643 | }\r |
644 | \r | |
147fd35c JW |
645 | /**\r |
646 | Disable Write Protect on pages marked as read-only.\r | |
647 | **/\r | |
648 | VOID\r | |
649 | DisableReadOnlyPageWriteProtect (\r | |
650 | VOID\r | |
651 | )\r | |
652 | {\r | |
29355b4e | 653 | IA32_CR0 Cr0;\r |
053e878b | 654 | \r |
2a1408d1 JW |
655 | //\r |
656 | // To avoid unforseen consequences, don't touch paging settings in SMM mode\r | |
657 | // in this driver.\r | |
658 | //\r | |
659 | if (!IsInSmm ()) {\r | |
053e878b | 660 | Cr0.UintN = AsmReadCr0 ();\r |
29355b4e RN |
661 | Cr0.Bits.WP = 0;\r |
662 | AsmWriteCr0 (Cr0.UintN);\r | |
2a1408d1 | 663 | }\r |
147fd35c JW |
664 | }\r |
665 | \r | |
666 | /**\r | |
667 | Enable Write Protect on pages marked as read-only.\r | |
668 | **/\r | |
669 | VOID\r | |
670 | EnableReadOnlyPageWriteProtect (\r | |
671 | VOID\r | |
672 | )\r | |
673 | {\r | |
29355b4e | 674 | IA32_CR0 Cr0;\r |
053e878b | 675 | \r |
2a1408d1 JW |
676 | //\r |
677 | // To avoid unforseen consequences, don't touch paging settings in SMM mode\r | |
678 | // in this driver.\r | |
679 | //\r | |
680 | if (!IsInSmm ()) {\r | |
053e878b | 681 | Cr0.UintN = AsmReadCr0 ();\r |
29355b4e RN |
682 | Cr0.Bits.WP = 1;\r |
683 | AsmWriteCr0 (Cr0.UintN);\r | |
2a1408d1 | 684 | }\r |
147fd35c JW |
685 | }\r |
686 | \r | |
22292ed3 JY |
687 | /**\r |
688 | This function modifies the page attributes for the memory region specified by BaseAddress and\r | |
689 | Length from their current attributes to the attributes specified by Attributes.\r | |
690 | \r | |
691 | Caller should make sure BaseAddress and Length is at page boundary.\r | |
692 | \r | |
693 | @param[in] PagingContext The paging context. NULL means get page table from current CPU context.\r | |
694 | @param[in] BaseAddress The physical address that is the start address of a memory region.\r | |
695 | @param[in] Length The size in bytes of the memory region.\r | |
696 | @param[in] Attributes The bit mask of attributes to modify for the memory region.\r | |
697 | @param[in] PageAction The page action.\r | |
698 | @param[in] AllocatePagesFunc If page split is needed, this function is used to allocate more pages.\r | |
699 | NULL mean page split is unsupported.\r | |
700 | @param[out] IsSplitted TRUE means page table splitted. FALSE means page table not splitted.\r | |
701 | @param[out] IsModified TRUE means page table modified. FALSE means page table not modified.\r | |
702 | \r | |
703 | @retval RETURN_SUCCESS The attributes were modified for the memory region.\r | |
704 | @retval RETURN_ACCESS_DENIED The attributes for the memory resource range specified by\r | |
705 | BaseAddress and Length cannot be modified.\r | |
706 | @retval RETURN_INVALID_PARAMETER Length is zero.\r | |
707 | Attributes specified an illegal combination of attributes that\r | |
708 | cannot be set together.\r | |
709 | @retval RETURN_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r | |
710 | the memory resource range.\r | |
711 | @retval RETURN_UNSUPPORTED The processor does not support one or more bytes of the memory\r | |
712 | resource range specified by BaseAddress and Length.\r | |
713 | The bit mask of attributes is not support for the memory resource\r | |
714 | range specified by BaseAddress and Length.\r | |
715 | **/\r | |
716 | RETURN_STATUS\r | |
717 | ConvertMemoryPageAttributes (\r | |
053e878b MK |
718 | IN PAGE_TABLE_LIB_PAGING_CONTEXT *PagingContext OPTIONAL,\r |
719 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
720 | IN UINT64 Length,\r | |
721 | IN UINT64 Attributes,\r | |
722 | IN PAGE_ACTION PageAction,\r | |
723 | IN PAGE_TABLE_LIB_ALLOCATE_PAGES AllocatePagesFunc OPTIONAL,\r | |
724 | OUT BOOLEAN *IsSplitted OPTIONAL,\r | |
725 | OUT BOOLEAN *IsModified OPTIONAL\r | |
22292ed3 JY |
726 | )\r |
727 | {\r | |
053e878b MK |
728 | PAGE_TABLE_LIB_PAGING_CONTEXT CurrentPagingContext;\r |
729 | UINT64 *PageEntry;\r | |
730 | PAGE_ATTRIBUTE PageAttribute;\r | |
731 | UINTN PageEntryLength;\r | |
732 | PAGE_ATTRIBUTE SplitAttribute;\r | |
733 | RETURN_STATUS Status;\r | |
734 | BOOLEAN IsEntryModified;\r | |
735 | BOOLEAN IsWpEnabled;\r | |
22292ed3 JY |
736 | \r |
737 | if ((BaseAddress & (SIZE_4KB - 1)) != 0) {\r | |
738 | DEBUG ((DEBUG_ERROR, "BaseAddress(0x%lx) is not aligned!\n", BaseAddress));\r | |
739 | return EFI_UNSUPPORTED;\r | |
740 | }\r | |
053e878b | 741 | \r |
22292ed3 JY |
742 | if ((Length & (SIZE_4KB - 1)) != 0) {\r |
743 | DEBUG ((DEBUG_ERROR, "Length(0x%lx) is not aligned!\n", Length));\r | |
744 | return EFI_UNSUPPORTED;\r | |
745 | }\r | |
053e878b | 746 | \r |
22292ed3 JY |
747 | if (Length == 0) {\r |
748 | DEBUG ((DEBUG_ERROR, "Length is 0!\n"));\r | |
749 | return RETURN_INVALID_PARAMETER;\r | |
750 | }\r | |
751 | \r | |
e77966b3 | 752 | if ((Attributes & ~EFI_MEMORY_ATTRIBUTE_MASK) != 0) {\r |
22292ed3 JY |
753 | DEBUG ((DEBUG_ERROR, "Attributes(0x%lx) has unsupported bit\n", Attributes));\r |
754 | return EFI_UNSUPPORTED;\r | |
755 | }\r | |
756 | \r | |
757 | if (PagingContext == NULL) {\r | |
758 | GetCurrentPagingContext (&CurrentPagingContext);\r | |
759 | } else {\r | |
053e878b | 760 | CopyMem (&CurrentPagingContext, PagingContext, sizeof (CurrentPagingContext));\r |
22292ed3 | 761 | }\r |
053e878b MK |
762 | \r |
763 | switch (CurrentPagingContext.MachineType) {\r | |
764 | case IMAGE_FILE_MACHINE_I386:\r | |
765 | if (CurrentPagingContext.ContextData.Ia32.PageTableBase == 0) {\r | |
766 | if (Attributes == 0) {\r | |
767 | return EFI_SUCCESS;\r | |
768 | } else {\r | |
769 | DEBUG ((DEBUG_ERROR, "PageTable is 0!\n"));\r | |
770 | return EFI_UNSUPPORTED;\r | |
771 | }\r | |
772 | }\r | |
773 | \r | |
774 | if ((CurrentPagingContext.ContextData.Ia32.Attributes & PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAE) == 0) {\r | |
775 | DEBUG ((DEBUG_ERROR, "Non-PAE Paging!\n"));\r | |
22292ed3 JY |
776 | return EFI_UNSUPPORTED;\r |
777 | }\r | |
053e878b MK |
778 | \r |
779 | if ((BaseAddress + Length) > BASE_4GB) {\r | |
780 | DEBUG ((DEBUG_ERROR, "Beyond 4GB memory in 32-bit mode!\n"));\r | |
781 | return EFI_UNSUPPORTED;\r | |
782 | }\r | |
783 | \r | |
784 | break;\r | |
785 | case IMAGE_FILE_MACHINE_X64:\r | |
786 | ASSERT (CurrentPagingContext.ContextData.X64.PageTableBase != 0);\r | |
787 | break;\r | |
788 | default:\r | |
789 | ASSERT (FALSE);\r | |
4f10654e | 790 | return EFI_UNSUPPORTED;\r |
053e878b | 791 | break;\r |
22292ed3 JY |
792 | }\r |
793 | \r | |
053e878b | 794 | // DEBUG ((DEBUG_ERROR, "ConvertMemoryPageAttributes(%x) - %016lx, %016lx, %02lx\n", IsSet, BaseAddress, Length, Attributes));\r |
22292ed3 JY |
795 | \r |
796 | if (IsSplitted != NULL) {\r | |
797 | *IsSplitted = FALSE;\r | |
798 | }\r | |
053e878b | 799 | \r |
22292ed3 JY |
800 | if (IsModified != NULL) {\r |
801 | *IsModified = FALSE;\r | |
802 | }\r | |
053e878b | 803 | \r |
147fd35c JW |
804 | if (AllocatePagesFunc == NULL) {\r |
805 | AllocatePagesFunc = AllocatePageTableMemory;\r | |
806 | }\r | |
807 | \r | |
808 | //\r | |
809 | // Make sure that the page table is changeable.\r | |
810 | //\r | |
811 | IsWpEnabled = IsReadOnlyPageWriteProtected ();\r | |
812 | if (IsWpEnabled) {\r | |
813 | DisableReadOnlyPageWriteProtect ();\r | |
814 | }\r | |
22292ed3 JY |
815 | \r |
816 | //\r | |
f60f4cfe | 817 | // Below logic is to check 2M/4K page to make sure we do not waste memory.\r |
22292ed3 | 818 | //\r |
147fd35c | 819 | Status = EFI_SUCCESS;\r |
22292ed3 JY |
820 | while (Length != 0) {\r |
821 | PageEntry = GetPageTableEntry (&CurrentPagingContext, BaseAddress, &PageAttribute);\r | |
822 | if (PageEntry == NULL) {\r | |
147fd35c JW |
823 | Status = RETURN_UNSUPPORTED;\r |
824 | goto Done;\r | |
22292ed3 | 825 | }\r |
053e878b | 826 | \r |
22292ed3 | 827 | PageEntryLength = PageAttributeToLength (PageAttribute);\r |
053e878b | 828 | SplitAttribute = NeedSplitPage (BaseAddress, Length, PageEntry, PageAttribute);\r |
22292ed3 JY |
829 | if (SplitAttribute == PageNone) {\r |
830 | ConvertPageEntryAttribute (&CurrentPagingContext, PageEntry, Attributes, PageAction, &IsEntryModified);\r | |
831 | if (IsEntryModified) {\r | |
832 | if (IsModified != NULL) {\r | |
833 | *IsModified = TRUE;\r | |
834 | }\r | |
835 | }\r | |
053e878b | 836 | \r |
22292ed3 JY |
837 | //\r |
838 | // Convert success, move to next\r | |
839 | //\r | |
840 | BaseAddress += PageEntryLength;\r | |
053e878b | 841 | Length -= PageEntryLength;\r |
22292ed3 JY |
842 | } else {\r |
843 | if (AllocatePagesFunc == NULL) {\r | |
147fd35c JW |
844 | Status = RETURN_UNSUPPORTED;\r |
845 | goto Done;\r | |
22292ed3 | 846 | }\r |
053e878b | 847 | \r |
22292ed3 JY |
848 | Status = SplitPage (PageEntry, PageAttribute, SplitAttribute, AllocatePagesFunc);\r |
849 | if (RETURN_ERROR (Status)) {\r | |
147fd35c JW |
850 | Status = RETURN_UNSUPPORTED;\r |
851 | goto Done;\r | |
22292ed3 | 852 | }\r |
053e878b | 853 | \r |
22292ed3 JY |
854 | if (IsSplitted != NULL) {\r |
855 | *IsSplitted = TRUE;\r | |
856 | }\r | |
053e878b | 857 | \r |
22292ed3 JY |
858 | if (IsModified != NULL) {\r |
859 | *IsModified = TRUE;\r | |
860 | }\r | |
053e878b | 861 | \r |
22292ed3 JY |
862 | //\r |
863 | // Just split current page\r | |
864 | // Convert success in next around\r | |
865 | //\r | |
866 | }\r | |
867 | }\r | |
868 | \r | |
147fd35c JW |
869 | Done:\r |
870 | //\r | |
871 | // Restore page table write protection, if any.\r | |
872 | //\r | |
873 | if (IsWpEnabled) {\r | |
874 | EnableReadOnlyPageWriteProtect ();\r | |
875 | }\r | |
053e878b | 876 | \r |
147fd35c | 877 | return Status;\r |
22292ed3 JY |
878 | }\r |
879 | \r | |
880 | /**\r | |
881 | This function assigns the page attributes for the memory region specified by BaseAddress and\r | |
882 | Length from their current attributes to the attributes specified by Attributes.\r | |
883 | \r | |
884 | Caller should make sure BaseAddress and Length is at page boundary.\r | |
885 | \r | |
f60f4cfe | 886 | Caller need guarantee the TPL <= TPL_NOTIFY, if there is split page request.\r |
22292ed3 JY |
887 | \r |
888 | @param[in] PagingContext The paging context. NULL means get page table from current CPU context.\r | |
889 | @param[in] BaseAddress The physical address that is the start address of a memory region.\r | |
890 | @param[in] Length The size in bytes of the memory region.\r | |
891 | @param[in] Attributes The bit mask of attributes to set for the memory region.\r | |
892 | @param[in] AllocatePagesFunc If page split is needed, this function is used to allocate more pages.\r | |
893 | NULL mean page split is unsupported.\r | |
894 | \r | |
895 | @retval RETURN_SUCCESS The attributes were cleared for the memory region.\r | |
896 | @retval RETURN_ACCESS_DENIED The attributes for the memory resource range specified by\r | |
897 | BaseAddress and Length cannot be modified.\r | |
898 | @retval RETURN_INVALID_PARAMETER Length is zero.\r | |
899 | Attributes specified an illegal combination of attributes that\r | |
900 | cannot be set together.\r | |
901 | @retval RETURN_OUT_OF_RESOURCES There are not enough system resources to modify the attributes of\r | |
902 | the memory resource range.\r | |
903 | @retval RETURN_UNSUPPORTED The processor does not support one or more bytes of the memory\r | |
904 | resource range specified by BaseAddress and Length.\r | |
905 | The bit mask of attributes is not support for the memory resource\r | |
906 | range specified by BaseAddress and Length.\r | |
907 | **/\r | |
908 | RETURN_STATUS\r | |
909 | EFIAPI\r | |
910 | AssignMemoryPageAttributes (\r | |
053e878b MK |
911 | IN PAGE_TABLE_LIB_PAGING_CONTEXT *PagingContext OPTIONAL,\r |
912 | IN PHYSICAL_ADDRESS BaseAddress,\r | |
913 | IN UINT64 Length,\r | |
914 | IN UINT64 Attributes,\r | |
915 | IN PAGE_TABLE_LIB_ALLOCATE_PAGES AllocatePagesFunc OPTIONAL\r | |
22292ed3 JY |
916 | )\r |
917 | {\r | |
918 | RETURN_STATUS Status;\r | |
919 | BOOLEAN IsModified;\r | |
920 | BOOLEAN IsSplitted;\r | |
921 | \r | |
053e878b | 922 | // DEBUG((DEBUG_INFO, "AssignMemoryPageAttributes: 0x%lx - 0x%lx (0x%lx)\n", BaseAddress, Length, Attributes));\r |
22292ed3 | 923 | Status = ConvertMemoryPageAttributes (PagingContext, BaseAddress, Length, Attributes, PageActionAssign, AllocatePagesFunc, &IsSplitted, &IsModified);\r |
053e878b | 924 | if (!EFI_ERROR (Status)) {\r |
22292ed3 JY |
925 | if ((PagingContext == NULL) && IsModified) {\r |
926 | //\r | |
41a9c3fd JW |
927 | // Flush TLB as last step.\r |
928 | //\r | |
929 | // Note: Since APs will always init CR3 register in HLT loop mode or do\r | |
930 | // TLB flush in MWAIT loop mode, there's no need to flush TLB for them\r | |
931 | // here.\r | |
22292ed3 | 932 | //\r |
053e878b | 933 | CpuFlushTlb ();\r |
22292ed3 JY |
934 | }\r |
935 | }\r | |
936 | \r | |
937 | return Status;\r | |
938 | }\r | |
939 | \r | |
768bd967 JW |
940 | /**\r |
941 | Check if Execute Disable feature is enabled or not.\r | |
942 | **/\r | |
943 | BOOLEAN\r | |
944 | IsExecuteDisableEnabled (\r | |
945 | VOID\r | |
946 | )\r | |
947 | {\r | |
053e878b | 948 | MSR_CORE_IA32_EFER_REGISTER MsrEfer;\r |
768bd967 JW |
949 | \r |
950 | MsrEfer.Uint64 = AsmReadMsr64 (MSR_IA32_EFER);\r | |
951 | return (MsrEfer.Bits.NXE == 1);\r | |
952 | }\r | |
953 | \r | |
c1cab54c JW |
954 | /**\r |
955 | Update GCD memory space attributes according to current page table setup.\r | |
956 | **/\r | |
957 | VOID\r | |
958 | RefreshGcdMemoryAttributesFromPaging (\r | |
959 | VOID\r | |
960 | )\r | |
961 | {\r | |
053e878b MK |
962 | EFI_STATUS Status;\r |
963 | UINTN NumberOfDescriptors;\r | |
964 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemorySpaceMap;\r | |
965 | PAGE_TABLE_LIB_PAGING_CONTEXT PagingContext;\r | |
966 | PAGE_ATTRIBUTE PageAttribute;\r | |
967 | UINT64 *PageEntry;\r | |
968 | UINT64 PageLength;\r | |
969 | UINT64 MemorySpaceLength;\r | |
970 | UINT64 Length;\r | |
971 | UINT64 BaseAddress;\r | |
972 | UINT64 PageStartAddress;\r | |
973 | UINT64 Attributes;\r | |
974 | UINT64 Capabilities;\r | |
975 | UINT64 NewAttributes;\r | |
976 | UINTN Index;\r | |
c1cab54c JW |
977 | \r |
978 | //\r | |
979 | // Assuming that memory space map returned is sorted already; otherwise sort\r | |
980 | // them in the order of lowest address to highest address.\r | |
981 | //\r | |
982 | Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);\r | |
983 | ASSERT_EFI_ERROR (Status);\r | |
984 | \r | |
985 | GetCurrentPagingContext (&PagingContext);\r | |
986 | \r | |
053e878b MK |
987 | Attributes = 0;\r |
988 | NewAttributes = 0;\r | |
989 | BaseAddress = 0;\r | |
990 | PageLength = 0;\r | |
768bd967 JW |
991 | \r |
992 | if (IsExecuteDisableEnabled ()) {\r | |
993 | Capabilities = EFI_MEMORY_RO | EFI_MEMORY_RP | EFI_MEMORY_XP;\r | |
994 | } else {\r | |
995 | Capabilities = EFI_MEMORY_RO | EFI_MEMORY_RP;\r | |
996 | }\r | |
96207191 | 997 | \r |
c1cab54c JW |
998 | for (Index = 0; Index < NumberOfDescriptors; Index++) {\r |
999 | if (MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeNonExistent) {\r | |
1000 | continue;\r | |
1001 | }\r | |
1002 | \r | |
768bd967 JW |
1003 | //\r |
1004 | // Sync the actual paging related capabilities back to GCD service first.\r | |
1005 | // As a side effect (good one), this can also help to avoid unnecessary\r | |
1006 | // memory map entries due to the different capabilities of the same type\r | |
1007 | // memory, such as multiple RT_CODE and RT_DATA entries in memory map,\r | |
1008 | // which could cause boot failure of some old Linux distro (before v4.3).\r | |
1009 | //\r | |
1010 | Status = gDS->SetMemorySpaceCapabilities (\r | |
1011 | MemorySpaceMap[Index].BaseAddress,\r | |
1012 | MemorySpaceMap[Index].Length,\r | |
1013 | MemorySpaceMap[Index].Capabilities | Capabilities\r | |
1014 | );\r | |
1015 | if (EFI_ERROR (Status)) {\r | |
1016 | //\r | |
f60f4cfe | 1017 | // If we cannot update the capabilities, we cannot update its\r |
768bd967 JW |
1018 | // attributes either. So just simply skip current block of memory.\r |
1019 | //\r | |
1020 | DEBUG ((\r | |
1021 | DEBUG_WARN,\r | |
1022 | "Failed to update capability: [%lu] %016lx - %016lx (%016lx -> %016lx)\r\n",\r | |
053e878b MK |
1023 | (UINT64)Index,\r |
1024 | MemorySpaceMap[Index].BaseAddress,\r | |
768bd967 JW |
1025 | MemorySpaceMap[Index].BaseAddress + MemorySpaceMap[Index].Length - 1,\r |
1026 | MemorySpaceMap[Index].Capabilities,\r | |
1027 | MemorySpaceMap[Index].Capabilities | Capabilities\r | |
1028 | ));\r | |
1029 | continue;\r | |
1030 | }\r | |
1031 | \r | |
c1cab54c JW |
1032 | if (MemorySpaceMap[Index].BaseAddress >= (BaseAddress + PageLength)) {\r |
1033 | //\r | |
1034 | // Current memory space starts at a new page. Resetting PageLength will\r | |
1035 | // trigger a retrieval of page attributes at new address.\r | |
1036 | //\r | |
1037 | PageLength = 0;\r | |
1038 | } else {\r | |
1039 | //\r | |
1040 | // In case current memory space is not adjacent to last one\r | |
1041 | //\r | |
1042 | PageLength -= (MemorySpaceMap[Index].BaseAddress - BaseAddress);\r | |
1043 | }\r | |
1044 | \r | |
768bd967 JW |
1045 | //\r |
1046 | // Sync actual page attributes to GCD\r | |
1047 | //\r | |
c1cab54c JW |
1048 | BaseAddress = MemorySpaceMap[Index].BaseAddress;\r |
1049 | MemorySpaceLength = MemorySpaceMap[Index].Length;\r | |
1050 | while (MemorySpaceLength > 0) {\r | |
1051 | if (PageLength == 0) {\r | |
1052 | PageEntry = GetPageTableEntry (&PagingContext, BaseAddress, &PageAttribute);\r | |
1053 | if (PageEntry == NULL) {\r | |
1054 | break;\r | |
1055 | }\r | |
1056 | \r | |
1057 | //\r | |
1058 | // Note current memory space might start in the middle of a page\r | |
1059 | //\r | |
053e878b MK |
1060 | PageStartAddress = (*PageEntry) & (UINT64)PageAttributeToMask (PageAttribute);\r |
1061 | PageLength = PageAttributeToLength (PageAttribute) - (BaseAddress - PageStartAddress);\r | |
1062 | Attributes = GetAttributesFromPageEntry (PageEntry);\r | |
c1cab54c JW |
1063 | }\r |
1064 | \r | |
1065 | Length = MIN (PageLength, MemorySpaceLength);\r | |
768bd967 | 1066 | if (Attributes != (MemorySpaceMap[Index].Attributes &\r |
053e878b MK |
1067 | EFI_MEMORY_ATTRIBUTE_MASK))\r |
1068 | {\r | |
768bd967 | 1069 | NewAttributes = (MemorySpaceMap[Index].Attributes &\r |
e77966b3 | 1070 | ~EFI_MEMORY_ATTRIBUTE_MASK) | Attributes;\r |
768bd967 JW |
1071 | Status = gDS->SetMemorySpaceAttributes (\r |
1072 | BaseAddress,\r | |
1073 | Length,\r | |
1074 | NewAttributes\r | |
1075 | );\r | |
1076 | ASSERT_EFI_ERROR (Status);\r | |
1077 | DEBUG ((\r | |
fbe2c4b9 | 1078 | DEBUG_VERBOSE,\r |
768bd967 | 1079 | "Updated memory space attribute: [%lu] %016lx - %016lx (%016lx -> %016lx)\r\n",\r |
053e878b MK |
1080 | (UINT64)Index,\r |
1081 | BaseAddress,\r | |
1082 | BaseAddress + Length - 1,\r | |
768bd967 JW |
1083 | MemorySpaceMap[Index].Attributes,\r |
1084 | NewAttributes\r | |
1085 | ));\r | |
c1cab54c JW |
1086 | }\r |
1087 | \r | |
1088 | PageLength -= Length;\r | |
1089 | MemorySpaceLength -= Length;\r | |
1090 | BaseAddress += Length;\r | |
1091 | }\r | |
1092 | }\r | |
1093 | \r | |
1094 | FreePool (MemorySpaceMap);\r | |
1095 | }\r | |
1096 | \r | |
147fd35c JW |
1097 | /**\r |
1098 | Initialize a buffer pool for page table use only.\r | |
1099 | \r | |
1100 | To reduce the potential split operation on page table, the pages reserved for\r | |
1101 | page table should be allocated in the times of PAGE_TABLE_POOL_UNIT_PAGES and\r | |
1102 | at the boundary of PAGE_TABLE_POOL_ALIGNMENT. So the page pool is always\r | |
1103 | initialized with number of pages greater than or equal to the given PoolPages.\r | |
1104 | \r | |
1105 | Once the pages in the pool are used up, this method should be called again to\r | |
1106 | reserve at least another PAGE_TABLE_POOL_UNIT_PAGES. Usually this won't happen\r | |
1107 | often in practice.\r | |
1108 | \r | |
1109 | @param[in] PoolPages The least page number of the pool to be created.\r | |
1110 | \r | |
1111 | @retval TRUE The pool is initialized successfully.\r | |
1112 | @retval FALSE The memory is out of resource.\r | |
1113 | **/\r | |
1114 | BOOLEAN\r | |
1115 | InitializePageTablePool (\r | |
053e878b | 1116 | IN UINTN PoolPages\r |
147fd35c JW |
1117 | )\r |
1118 | {\r | |
053e878b MK |
1119 | VOID *Buffer;\r |
1120 | BOOLEAN IsModified;\r | |
147fd35c | 1121 | \r |
54efcfea JW |
1122 | //\r |
1123 | // Do not allow re-entrance.\r | |
1124 | //\r | |
1125 | if (mPageTablePoolLock) {\r | |
1126 | return FALSE;\r | |
1127 | }\r | |
1128 | \r | |
1129 | mPageTablePoolLock = TRUE;\r | |
053e878b | 1130 | IsModified = FALSE;\r |
54efcfea | 1131 | \r |
147fd35c JW |
1132 | //\r |
1133 | // Always reserve at least PAGE_TABLE_POOL_UNIT_PAGES, including one page for\r | |
1134 | // header.\r | |
1135 | //\r | |
1136 | PoolPages += 1; // Add one page for header.\r | |
053e878b MK |
1137 | PoolPages = ((PoolPages - 1) / PAGE_TABLE_POOL_UNIT_PAGES + 1) *\r |
1138 | PAGE_TABLE_POOL_UNIT_PAGES;\r | |
147fd35c JW |
1139 | Buffer = AllocateAlignedPages (PoolPages, PAGE_TABLE_POOL_ALIGNMENT);\r |
1140 | if (Buffer == NULL) {\r | |
1141 | DEBUG ((DEBUG_ERROR, "ERROR: Out of aligned pages\r\n"));\r | |
54efcfea | 1142 | goto Done;\r |
147fd35c JW |
1143 | }\r |
1144 | \r | |
54efcfea JW |
1145 | DEBUG ((\r |
1146 | DEBUG_INFO,\r | |
1147 | "Paging: added %lu pages to page table pool\r\n",\r | |
1148 | (UINT64)PoolPages\r | |
1149 | ));\r | |
1150 | \r | |
147fd35c JW |
1151 | //\r |
1152 | // Link all pools into a list for easier track later.\r | |
1153 | //\r | |
1154 | if (mPageTablePool == NULL) {\r | |
053e878b | 1155 | mPageTablePool = Buffer;\r |
147fd35c JW |
1156 | mPageTablePool->NextPool = mPageTablePool;\r |
1157 | } else {\r | |
1158 | ((PAGE_TABLE_POOL *)Buffer)->NextPool = mPageTablePool->NextPool;\r | |
053e878b MK |
1159 | mPageTablePool->NextPool = Buffer;\r |
1160 | mPageTablePool = Buffer;\r | |
147fd35c JW |
1161 | }\r |
1162 | \r | |
1163 | //\r | |
1164 | // Reserve one page for pool header.\r | |
1165 | //\r | |
053e878b MK |
1166 | mPageTablePool->FreePages = PoolPages - 1;\r |
1167 | mPageTablePool->Offset = EFI_PAGES_TO_SIZE (1);\r | |
147fd35c JW |
1168 | \r |
1169 | //\r | |
1170 | // Mark the whole pool pages as read-only.\r | |
1171 | //\r | |
1172 | ConvertMemoryPageAttributes (\r | |
1173 | NULL,\r | |
1174 | (PHYSICAL_ADDRESS)(UINTN)Buffer,\r | |
1175 | EFI_PAGES_TO_SIZE (PoolPages),\r | |
1176 | EFI_MEMORY_RO,\r | |
1177 | PageActionSet,\r | |
1178 | AllocatePageTableMemory,\r | |
1179 | NULL,\r | |
1180 | &IsModified\r | |
1181 | );\r | |
1182 | ASSERT (IsModified == TRUE);\r | |
1183 | \r | |
54efcfea JW |
1184 | Done:\r |
1185 | mPageTablePoolLock = FALSE;\r | |
1186 | return IsModified;\r | |
147fd35c JW |
1187 | }\r |
1188 | \r | |
1189 | /**\r | |
1190 | This API provides a way to allocate memory for page table.\r | |
1191 | \r | |
1192 | This API can be called more than once to allocate memory for page tables.\r | |
1193 | \r | |
1194 | Allocates the number of 4KB pages and returns a pointer to the allocated\r | |
1195 | buffer. The buffer returned is aligned on a 4KB boundary.\r | |
1196 | \r | |
1197 | If Pages is 0, then NULL is returned.\r | |
1198 | If there is not enough memory remaining to satisfy the request, then NULL is\r | |
1199 | returned.\r | |
1200 | \r | |
1201 | @param Pages The number of 4 KB pages to allocate.\r | |
1202 | \r | |
1203 | @return A pointer to the allocated buffer or NULL if allocation fails.\r | |
1204 | \r | |
1205 | **/\r | |
1206 | VOID *\r | |
1207 | EFIAPI\r | |
1208 | AllocatePageTableMemory (\r | |
053e878b | 1209 | IN UINTN Pages\r |
147fd35c JW |
1210 | )\r |
1211 | {\r | |
053e878b | 1212 | VOID *Buffer;\r |
147fd35c JW |
1213 | \r |
1214 | if (Pages == 0) {\r | |
1215 | return NULL;\r | |
1216 | }\r | |
1217 | \r | |
1218 | //\r | |
1219 | // Renew the pool if necessary.\r | |
1220 | //\r | |
053e878b MK |
1221 | if ((mPageTablePool == NULL) ||\r |
1222 | (Pages > mPageTablePool->FreePages))\r | |
1223 | {\r | |
147fd35c JW |
1224 | if (!InitializePageTablePool (Pages)) {\r |
1225 | return NULL;\r | |
1226 | }\r | |
1227 | }\r | |
1228 | \r | |
1229 | Buffer = (UINT8 *)mPageTablePool + mPageTablePool->Offset;\r | |
1230 | \r | |
053e878b MK |
1231 | mPageTablePool->Offset += EFI_PAGES_TO_SIZE (Pages);\r |
1232 | mPageTablePool->FreePages -= Pages;\r | |
147fd35c JW |
1233 | \r |
1234 | return Buffer;\r | |
1235 | }\r | |
1236 | \r | |
dcc02621 JW |
1237 | /**\r |
1238 | Special handler for #DB exception, which will restore the page attributes\r | |
1239 | (not-present). It should work with #PF handler which will set pages to\r | |
1240 | 'present'.\r | |
1241 | \r | |
1242 | @param ExceptionType Exception type.\r | |
1243 | @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r | |
1244 | \r | |
1245 | **/\r | |
1246 | VOID\r | |
1247 | EFIAPI\r | |
1248 | DebugExceptionHandler (\r | |
053e878b MK |
1249 | IN EFI_EXCEPTION_TYPE ExceptionType,\r |
1250 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
dcc02621 JW |
1251 | )\r |
1252 | {\r | |
053e878b MK |
1253 | UINTN CpuIndex;\r |
1254 | UINTN PFEntry;\r | |
1255 | BOOLEAN IsWpEnabled;\r | |
dcc02621 JW |
1256 | \r |
1257 | MpInitLibWhoAmI (&CpuIndex);\r | |
1258 | \r | |
1259 | //\r | |
1260 | // Clear last PF entries\r | |
1261 | //\r | |
1262 | IsWpEnabled = IsReadOnlyPageWriteProtected ();\r | |
1263 | if (IsWpEnabled) {\r | |
1264 | DisableReadOnlyPageWriteProtect ();\r | |
1265 | }\r | |
1266 | \r | |
1267 | for (PFEntry = 0; PFEntry < mPFEntryCount[CpuIndex]; PFEntry++) {\r | |
1268 | if (mLastPFEntryPointer[CpuIndex][PFEntry] != NULL) {\r | |
8e2018f9 | 1269 | *mLastPFEntryPointer[CpuIndex][PFEntry] &= ~(UINT64)IA32_PG_P;\r |
dcc02621 JW |
1270 | }\r |
1271 | }\r | |
1272 | \r | |
1273 | if (IsWpEnabled) {\r | |
1274 | EnableReadOnlyPageWriteProtect ();\r | |
1275 | }\r | |
1276 | \r | |
1277 | //\r | |
1278 | // Reset page fault exception count for next page fault.\r | |
1279 | //\r | |
1280 | mPFEntryCount[CpuIndex] = 0;\r | |
1281 | \r | |
1282 | //\r | |
1283 | // Flush TLB\r | |
1284 | //\r | |
1285 | CpuFlushTlb ();\r | |
1286 | \r | |
1287 | //\r | |
1288 | // Clear TF in EFLAGS\r | |
1289 | //\r | |
1290 | if (mPagingContext.MachineType == IMAGE_FILE_MACHINE_I386) {\r | |
053e878b | 1291 | SystemContext.SystemContextIa32->Eflags &= (UINT32) ~BIT8;\r |
dcc02621 | 1292 | } else {\r |
053e878b | 1293 | SystemContext.SystemContextX64->Rflags &= (UINT64) ~BIT8;\r |
dcc02621 JW |
1294 | }\r |
1295 | }\r | |
1296 | \r | |
1297 | /**\r | |
1298 | Special handler for #PF exception, which will set the pages which caused\r | |
1299 | #PF to be 'present'. The attribute of those pages should be restored in\r | |
1300 | the subsequent #DB handler.\r | |
1301 | \r | |
1302 | @param ExceptionType Exception type.\r | |
1303 | @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r | |
1304 | \r | |
1305 | **/\r | |
1306 | VOID\r | |
1307 | EFIAPI\r | |
1308 | PageFaultExceptionHandler (\r | |
053e878b MK |
1309 | IN EFI_EXCEPTION_TYPE ExceptionType,\r |
1310 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
dcc02621 JW |
1311 | )\r |
1312 | {\r | |
053e878b MK |
1313 | EFI_STATUS Status;\r |
1314 | UINT64 PFAddress;\r | |
1315 | PAGE_TABLE_LIB_PAGING_CONTEXT PagingContext;\r | |
1316 | PAGE_ATTRIBUTE PageAttribute;\r | |
1317 | UINT64 Attributes;\r | |
1318 | UINT64 *PageEntry;\r | |
1319 | UINTN Index;\r | |
1320 | UINTN CpuIndex;\r | |
1321 | UINTN PageNumber;\r | |
1322 | BOOLEAN NonStopMode;\r | |
dcc02621 JW |
1323 | \r |
1324 | PFAddress = AsmReadCr2 () & ~EFI_PAGE_MASK;\r | |
1325 | if (PFAddress < BASE_4KB) {\r | |
1326 | NonStopMode = NULL_DETECTION_NONSTOP_MODE ? TRUE : FALSE;\r | |
1327 | } else {\r | |
1328 | NonStopMode = HEAP_GUARD_NONSTOP_MODE ? TRUE : FALSE;\r | |
1329 | }\r | |
1330 | \r | |
1331 | if (NonStopMode) {\r | |
1332 | MpInitLibWhoAmI (&CpuIndex);\r | |
1333 | GetCurrentPagingContext (&PagingContext);\r | |
1334 | //\r | |
1335 | // Memory operation cross page boundary, like "rep mov" instruction, will\r | |
1336 | // cause infinite loop between this and Debug Trap handler. We have to make\r | |
1337 | // sure that current page and the page followed are both in PRESENT state.\r | |
1338 | //\r | |
1339 | PageNumber = 2;\r | |
1340 | while (PageNumber > 0) {\r | |
1341 | PageEntry = GetPageTableEntry (&PagingContext, PFAddress, &PageAttribute);\r | |
053e878b | 1342 | ASSERT (PageEntry != NULL);\r |
dcc02621 JW |
1343 | \r |
1344 | if (PageEntry != NULL) {\r | |
1345 | Attributes = GetAttributesFromPageEntry (PageEntry);\r | |
1346 | if ((Attributes & EFI_MEMORY_RP) != 0) {\r | |
1347 | Attributes &= ~EFI_MEMORY_RP;\r | |
053e878b MK |
1348 | Status = AssignMemoryPageAttributes (\r |
1349 | &PagingContext,\r | |
1350 | PFAddress,\r | |
1351 | EFI_PAGE_SIZE,\r | |
1352 | Attributes,\r | |
1353 | NULL\r | |
1354 | );\r | |
1355 | if (!EFI_ERROR (Status)) {\r | |
dcc02621 JW |
1356 | Index = mPFEntryCount[CpuIndex];\r |
1357 | //\r | |
1358 | // Re-retrieve page entry because above calling might update page\r | |
1359 | // table due to table split.\r | |
1360 | //\r | |
053e878b | 1361 | PageEntry = GetPageTableEntry (&PagingContext, PFAddress, &PageAttribute);\r |
dcc02621 | 1362 | mLastPFEntryPointer[CpuIndex][Index++] = PageEntry;\r |
053e878b | 1363 | mPFEntryCount[CpuIndex] = Index;\r |
dcc02621 JW |
1364 | }\r |
1365 | }\r | |
1366 | }\r | |
1367 | \r | |
1368 | PFAddress += EFI_PAGE_SIZE;\r | |
1369 | --PageNumber;\r | |
1370 | }\r | |
1371 | }\r | |
1372 | \r | |
1373 | //\r | |
1374 | // Initialize the serial port before dumping.\r | |
1375 | //\r | |
1376 | SerialPortInitialize ();\r | |
1377 | //\r | |
1378 | // Display ExceptionType, CPU information and Image information\r | |
1379 | //\r | |
1380 | DumpCpuContext (ExceptionType, SystemContext);\r | |
2a93cccc JW |
1381 | if (NonStopMode) {\r |
1382 | //\r | |
1383 | // Set TF in EFLAGS\r | |
1384 | //\r | |
1385 | if (mPagingContext.MachineType == IMAGE_FILE_MACHINE_I386) {\r | |
1386 | SystemContext.SystemContextIa32->Eflags |= (UINT32)BIT8;\r | |
1387 | } else {\r | |
1388 | SystemContext.SystemContextX64->Rflags |= (UINT64)BIT8;\r | |
1389 | }\r | |
1390 | } else {\r | |
dcc02621 JW |
1391 | CpuDeadLoop ();\r |
1392 | }\r | |
1393 | }\r | |
1394 | \r | |
22292ed3 JY |
1395 | /**\r |
1396 | Initialize the Page Table lib.\r | |
1397 | **/\r | |
1398 | VOID\r | |
1399 | InitializePageTableLib (\r | |
1400 | VOID\r | |
1401 | )\r | |
1402 | {\r | |
053e878b MK |
1403 | PAGE_TABLE_LIB_PAGING_CONTEXT CurrentPagingContext;\r |
1404 | UINT32 *Attributes;\r | |
1405 | UINTN *PageTableBase;\r | |
22292ed3 JY |
1406 | \r |
1407 | GetCurrentPagingContext (&CurrentPagingContext);\r | |
147fd35c | 1408 | \r |
c70fef96 ED |
1409 | GetPagingDetails (&CurrentPagingContext.ContextData, &PageTableBase, &Attributes);\r |
1410 | \r | |
147fd35c JW |
1411 | //\r |
1412 | // Reserve memory of page tables for future uses, if paging is enabled.\r | |
1413 | //\r | |
c70fef96 | 1414 | if ((*PageTableBase != 0) &&\r |
053e878b MK |
1415 | ((*Attributes & PAGE_TABLE_LIB_PAGING_CONTEXT_IA32_X64_ATTRIBUTES_PAE) != 0))\r |
1416 | {\r | |
147fd35c JW |
1417 | DisableReadOnlyPageWriteProtect ();\r |
1418 | InitializePageTablePool (1);\r | |
1419 | EnableReadOnlyPageWriteProtect ();\r | |
1420 | }\r | |
1421 | \r | |
dcc02621 JW |
1422 | if (HEAP_GUARD_NONSTOP_MODE || NULL_DETECTION_NONSTOP_MODE) {\r |
1423 | mPFEntryCount = (UINTN *)AllocateZeroPool (sizeof (UINTN) * mNumberOfProcessors);\r | |
1424 | ASSERT (mPFEntryCount != NULL);\r | |
1425 | \r | |
1426 | mLastPFEntryPointer = (UINT64 *(*)[MAX_PF_ENTRY_COUNT])\r | |
1427 | AllocateZeroPool (sizeof (mLastPFEntryPointer[0]) * mNumberOfProcessors);\r | |
1428 | ASSERT (mLastPFEntryPointer != NULL);\r | |
1429 | }\r | |
1430 | \r | |
c70fef96 | 1431 | DEBUG ((DEBUG_INFO, "CurrentPagingContext:\n"));\r |
22292ed3 | 1432 | DEBUG ((DEBUG_INFO, " MachineType - 0x%x\n", CurrentPagingContext.MachineType));\r |
c70fef96 ED |
1433 | DEBUG ((DEBUG_INFO, " PageTableBase - 0x%Lx\n", (UINT64)*PageTableBase));\r |
1434 | DEBUG ((DEBUG_INFO, " Attributes - 0x%x\n", *Attributes));\r | |
22292ed3 | 1435 | \r |
053e878b | 1436 | return;\r |
22292ed3 | 1437 | }\r |