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427e3573 MK |
1 | /** @file\r |
2 | X64 processor specific functions to enable SMM profile.\r | |
3 | \r | |
4 | Copyright (c) 2012 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
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 | //\r | |
19 | // Current page index.\r | |
20 | //\r | |
21 | UINTN mPFPageIndex;\r | |
22 | \r | |
23 | //\r | |
24 | // Pool for dynamically creating page table in page fault handler.\r | |
25 | //\r | |
26 | UINT64 mPFPageBuffer;\r | |
27 | \r | |
28 | //\r | |
29 | // Store the uplink information for each page being used.\r | |
30 | //\r | |
31 | UINT64 *mPFPageUplink[MAX_PF_PAGE_COUNT];\r | |
32 | \r | |
33 | /**\r | |
34 | Create SMM page table for S3 path.\r | |
35 | \r | |
36 | **/\r | |
37 | VOID\r | |
38 | InitSmmS3Cr3 (\r | |
39 | VOID\r | |
40 | )\r | |
41 | {\r | |
42 | EFI_PHYSICAL_ADDRESS Pages;\r | |
43 | UINT64 *PTEntry;\r | |
44 | \r | |
45 | //\r | |
46 | // Generate PAE page table for the first 4GB memory space\r | |
47 | //\r | |
881520ea | 48 | Pages = Gen4GPageTable (1, FALSE);\r |
427e3573 MK |
49 | \r |
50 | //\r | |
51 | // Fill Page-Table-Level4 (PML4) entry\r | |
52 | //\r | |
53 | PTEntry = (UINT64*)(UINTN)(Pages - EFI_PAGES_TO_SIZE (1));\r | |
881520ea | 54 | *PTEntry = Pages | PAGE_ATTRIBUTE_BITS;\r |
427e3573 MK |
55 | ZeroMem (PTEntry + 1, EFI_PAGE_SIZE - sizeof (*PTEntry));\r |
56 | \r | |
57 | //\r | |
58 | // Return the address of PML4 (to set CR3)\r | |
59 | //\r | |
60 | mSmmS3ResumeState->SmmS3Cr3 = (UINT32)(UINTN)PTEntry;\r | |
61 | \r | |
62 | return ;\r | |
63 | }\r | |
64 | \r | |
65 | /**\r | |
66 | Allocate pages for creating 4KB-page based on 2MB-page when page fault happens.\r | |
67 | \r | |
68 | **/\r | |
69 | VOID\r | |
70 | InitPagesForPFHandler (\r | |
71 | VOID\r | |
72 | )\r | |
73 | {\r | |
74 | VOID *Address;\r | |
75 | \r | |
76 | //\r | |
77 | // Pre-Allocate memory for page fault handler\r | |
78 | //\r | |
79 | Address = NULL;\r | |
80 | Address = AllocatePages (MAX_PF_PAGE_COUNT);\r | |
ef3e20e3 | 81 | ASSERT (Address != NULL);\r |
427e3573 MK |
82 | \r |
83 | mPFPageBuffer = (UINT64)(UINTN) Address;\r | |
84 | mPFPageIndex = 0;\r | |
85 | ZeroMem ((VOID *) (UINTN) mPFPageBuffer, EFI_PAGE_SIZE * MAX_PF_PAGE_COUNT);\r | |
86 | ZeroMem (mPFPageUplink, sizeof (mPFPageUplink));\r | |
87 | \r | |
88 | return;\r | |
89 | }\r | |
90 | \r | |
91 | /**\r | |
92 | Allocate one page for creating 4KB-page based on 2MB-page.\r | |
93 | \r | |
94 | @param Uplink The address of Page-Directory entry.\r | |
95 | \r | |
96 | **/\r | |
97 | VOID\r | |
98 | AcquirePage (\r | |
99 | UINT64 *Uplink\r | |
100 | )\r | |
101 | {\r | |
102 | UINT64 Address;\r | |
103 | \r | |
104 | //\r | |
105 | // Get the buffer\r | |
106 | //\r | |
107 | Address = mPFPageBuffer + EFI_PAGES_TO_SIZE (mPFPageIndex);\r | |
108 | ZeroMem ((VOID *) (UINTN) Address, EFI_PAGE_SIZE);\r | |
109 | \r | |
110 | //\r | |
111 | // Cut the previous uplink if it exists and wasn't overwritten\r | |
112 | //\r | |
113 | if ((mPFPageUplink[mPFPageIndex] != NULL) && ((*mPFPageUplink[mPFPageIndex] & PHYSICAL_ADDRESS_MASK) == Address)) {\r | |
114 | *mPFPageUplink[mPFPageIndex] = 0;\r | |
115 | }\r | |
116 | \r | |
117 | //\r | |
118 | // Link & Record the current uplink\r | |
119 | //\r | |
881520ea | 120 | *Uplink = Address | PAGE_ATTRIBUTE_BITS;\r |
427e3573 MK |
121 | mPFPageUplink[mPFPageIndex] = Uplink;\r |
122 | \r | |
123 | mPFPageIndex = (mPFPageIndex + 1) % MAX_PF_PAGE_COUNT;\r | |
124 | }\r | |
125 | \r | |
126 | /**\r | |
127 | Update page table to map the memory correctly in order to make the instruction\r | |
128 | which caused page fault execute successfully. And it also save the original page\r | |
129 | table to be restored in single-step exception.\r | |
130 | \r | |
131 | @param PageTable PageTable Address.\r | |
132 | @param PFAddress The memory address which caused page fault exception.\r | |
133 | @param CpuIndex The index of the processor.\r | |
134 | @param ErrorCode The Error code of exception.\r | |
135 | @param IsValidPFAddress The flag indicates if SMM profile data need be added.\r | |
136 | \r | |
137 | **/\r | |
138 | VOID\r | |
139 | RestorePageTableAbove4G (\r | |
140 | UINT64 *PageTable,\r | |
141 | UINT64 PFAddress,\r | |
142 | UINTN CpuIndex,\r | |
143 | UINTN ErrorCode,\r | |
144 | BOOLEAN *IsValidPFAddress\r | |
145 | )\r | |
146 | {\r | |
147 | UINTN PTIndex;\r | |
148 | UINT64 Address;\r | |
149 | BOOLEAN Nx;\r | |
150 | BOOLEAN Existed;\r | |
151 | UINTN Index;\r | |
152 | UINTN PFIndex;\r | |
153 | \r | |
154 | ASSERT ((PageTable != NULL) && (IsValidPFAddress != NULL));\r | |
155 | \r | |
156 | //\r | |
157 | // If page fault address is 4GB above.\r | |
158 | //\r | |
159 | \r | |
160 | //\r | |
161 | // Check if page fault address has existed in page table.\r | |
162 | // If it exists in page table but page fault is generated,\r | |
163 | // there are 2 possible reasons: 1. present flag is set to 0; 2. instruction fetch in protected memory range.\r | |
164 | //\r | |
165 | Existed = FALSE;\r | |
166 | PageTable = (UINT64*)(AsmReadCr3 () & PHYSICAL_ADDRESS_MASK);\r | |
167 | PTIndex = BitFieldRead64 (PFAddress, 39, 47);\r | |
168 | if ((PageTable[PTIndex] & IA32_PG_P) != 0) {\r | |
169 | // PML4E\r | |
170 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
171 | PTIndex = BitFieldRead64 (PFAddress, 30, 38);\r | |
172 | if ((PageTable[PTIndex] & IA32_PG_P) != 0) {\r | |
173 | // PDPTE\r | |
174 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
175 | PTIndex = BitFieldRead64 (PFAddress, 21, 29);\r | |
176 | // PD\r | |
177 | if ((PageTable[PTIndex] & IA32_PG_PS) != 0) {\r | |
178 | //\r | |
179 | // 2MB page\r | |
180 | //\r | |
181 | Address = (UINT64)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
182 | if ((Address & PHYSICAL_ADDRESS_MASK & ~((1ull << 21) - 1)) == ((PFAddress & PHYSICAL_ADDRESS_MASK & ~((1ull << 21) - 1)))) {\r | |
183 | Existed = TRUE;\r | |
184 | }\r | |
185 | } else {\r | |
186 | //\r | |
187 | // 4KB page\r | |
188 | //\r | |
189 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
190 | if (PageTable != 0) {\r | |
191 | //\r | |
192 | // When there is a valid entry to map to 4KB page, need not create a new entry to map 2MB.\r | |
193 | //\r | |
194 | PTIndex = BitFieldRead64 (PFAddress, 12, 20);\r | |
195 | Address = (UINT64)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
196 | if ((Address & PHYSICAL_ADDRESS_MASK & ~((1ull << 12) - 1)) == (PFAddress & PHYSICAL_ADDRESS_MASK & ~((1ull << 12) - 1))) {\r | |
197 | Existed = TRUE;\r | |
198 | }\r | |
199 | }\r | |
200 | }\r | |
201 | }\r | |
202 | }\r | |
203 | \r | |
204 | //\r | |
205 | // If page entry does not existed in page table at all, create a new entry.\r | |
206 | //\r | |
207 | if (!Existed) {\r | |
208 | \r | |
209 | if (IsAddressValid (PFAddress, &Nx)) {\r | |
210 | //\r | |
211 | // If page fault address above 4GB is in protected range but it causes a page fault exception,\r | |
212 | // Will create a page entry for this page fault address, make page table entry as present/rw and execution-disable.\r | |
213 | // this access is not saved into SMM profile data.\r | |
214 | //\r | |
215 | *IsValidPFAddress = TRUE;\r | |
216 | }\r | |
217 | \r | |
218 | //\r | |
219 | // Create one entry in page table for page fault address.\r | |
220 | //\r | |
221 | SmiDefaultPFHandler ();\r | |
222 | //\r | |
223 | // Find the page table entry created just now.\r | |
224 | //\r | |
225 | PageTable = (UINT64*)(AsmReadCr3 () & PHYSICAL_ADDRESS_MASK);\r | |
226 | PFAddress = AsmReadCr2 ();\r | |
227 | // PML4E\r | |
228 | PTIndex = BitFieldRead64 (PFAddress, 39, 47);\r | |
229 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
230 | // PDPTE\r | |
231 | PTIndex = BitFieldRead64 (PFAddress, 30, 38);\r | |
232 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
233 | // PD\r | |
234 | PTIndex = BitFieldRead64 (PFAddress, 21, 29);\r | |
235 | Address = PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK;\r | |
236 | //\r | |
237 | // Check if 2MB-page entry need be changed to 4KB-page entry.\r | |
238 | //\r | |
239 | if (IsAddressSplit (Address)) {\r | |
240 | AcquirePage (&PageTable[PTIndex]);\r | |
241 | \r | |
242 | // PTE\r | |
243 | PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);\r | |
244 | for (Index = 0; Index < 512; Index++) {\r | |
881520ea | 245 | PageTable[Index] = Address | PAGE_ATTRIBUTE_BITS;\r |
427e3573 | 246 | if (!IsAddressValid (Address, &Nx)) {\r |
881520ea | 247 | PageTable[Index] = PageTable[Index] & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);\r |
427e3573 MK |
248 | }\r |
249 | if (Nx && mXdSupported) {\r | |
250 | PageTable[Index] = PageTable[Index] | IA32_PG_NX;\r | |
251 | }\r | |
252 | if (Address == (PFAddress & PHYSICAL_ADDRESS_MASK & ~((1ull << 12) - 1))) {\r | |
253 | PTIndex = Index;\r | |
254 | }\r | |
255 | Address += SIZE_4KB;\r | |
256 | } // end for PT\r | |
257 | } else {\r | |
258 | //\r | |
259 | // Update 2MB page entry.\r | |
260 | //\r | |
261 | if (!IsAddressValid (Address, &Nx)) {\r | |
262 | //\r | |
263 | // Patch to remove present flag and rw flag.\r | |
264 | //\r | |
881520ea | 265 | PageTable[PTIndex] = PageTable[PTIndex] & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);\r |
427e3573 MK |
266 | }\r |
267 | //\r | |
268 | // Set XD bit to 1\r | |
269 | //\r | |
270 | if (Nx && mXdSupported) {\r | |
271 | PageTable[PTIndex] = PageTable[PTIndex] | IA32_PG_NX;\r | |
272 | }\r | |
273 | }\r | |
274 | }\r | |
275 | \r | |
276 | //\r | |
277 | // Record old entries with non-present status\r | |
278 | // Old entries include the memory which instruction is at and the memory which instruction access.\r | |
279 | //\r | |
280 | //\r | |
281 | ASSERT (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT);\r | |
282 | if (mPFEntryCount[CpuIndex] < MAX_PF_ENTRY_COUNT) {\r | |
283 | PFIndex = mPFEntryCount[CpuIndex];\r | |
284 | mLastPFEntryValue[CpuIndex][PFIndex] = PageTable[PTIndex];\r | |
285 | mLastPFEntryPointer[CpuIndex][PFIndex] = &PageTable[PTIndex];\r | |
286 | mPFEntryCount[CpuIndex]++;\r | |
287 | }\r | |
288 | \r | |
289 | //\r | |
290 | // Add present flag or clear XD flag to make page fault handler succeed.\r | |
291 | //\r | |
881520ea | 292 | PageTable[PTIndex] |= (UINT64)(PAGE_ATTRIBUTE_BITS);\r |
427e3573 MK |
293 | if ((ErrorCode & IA32_PF_EC_ID) != 0) {\r |
294 | //\r | |
295 | // If page fault is caused by instruction fetch, clear XD bit in the entry.\r | |
296 | //\r | |
297 | PageTable[PTIndex] &= ~IA32_PG_NX;\r | |
298 | }\r | |
299 | \r | |
300 | return;\r | |
301 | }\r | |
302 | \r | |
303 | /**\r | |
304 | Clear TF in FLAGS.\r | |
305 | \r | |
306 | @param SystemContext A pointer to the processor context when\r | |
307 | the interrupt occurred on the processor.\r | |
308 | \r | |
309 | **/\r | |
310 | VOID\r | |
311 | ClearTrapFlag (\r | |
312 | IN OUT EFI_SYSTEM_CONTEXT SystemContext\r | |
313 | )\r | |
314 | {\r | |
315 | SystemContext.SystemContextX64->Rflags &= (UINTN) ~BIT8;\r | |
316 | }\r |