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9e604fe4 | 1 | /** @file\r |
509bc208 | 2 | IA32/x64 generic functions to support Debug Support protocol.\r |
c1f23d63 | 3 | \r |
d1102dba | 4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9d510e61 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
c1f23d63 | 6 | \r |
7 | **/\r | |
8 | \r | |
6e8a984e | 9 | #include "DebugSupport.h"\r |
c1f23d63 | 10 | \r |
11 | //\r | |
12 | // This the global main table to keep track of the interrupts\r | |
13 | //\r | |
c84507ab | 14 | IDT_ENTRY *IdtEntryTable = NULL;\r |
c1f23d63 | 15 | \r |
9e604fe4 | 16 | /**\r |
6e8a984e | 17 | Read IDT Gate Descriptor from IDT Table.\r |
9e604fe4 | 18 | \r |
6e8a984e | 19 | @param Vector Specifies vector number.\r |
c84507ab | 20 | @param IdtGateDescriptor Pointer to IDT Gate Descriptor read from IDT Table.\r |
9e604fe4 | 21 | \r |
22 | **/\r | |
c84507ab | 23 | VOID\r |
24 | ReadIdtGateDescriptor (\r | |
6e8a984e | 25 | IN EFI_EXCEPTION_TYPE Vector,\r |
c84507ab | 26 | OUT IA32_IDT_GATE_DESCRIPTOR *IdtGateDescriptor\r |
c1f23d63 | 27 | )\r |
c1f23d63 | 28 | {\r |
6e8a984e | 29 | IA32_DESCRIPTOR IdtrValue;\r |
30 | IA32_IDT_GATE_DESCRIPTOR *IdtTable;\r | |
c1f23d63 | 31 | \r |
6e8a984e | 32 | AsmReadIdtr (&IdtrValue);\r |
33 | IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtrValue.Base;\r | |
c1f23d63 | 34 | \r |
c84507ab | 35 | CopyMem ((VOID *) IdtGateDescriptor, (VOID *) &(IdtTable)[Vector], sizeof (IA32_IDT_GATE_DESCRIPTOR));\r |
6e8a984e | 36 | }\r |
c84507ab | 37 | \r |
6e8a984e | 38 | /**\r |
39 | Write IDT Gate Descriptor into IDT Table.\r | |
c1f23d63 | 40 | \r |
6e8a984e | 41 | @param Vector Specifies vector number.\r |
c84507ab | 42 | @param IdtGateDescriptor Pointer to IDT Gate Descriptor written into IDT Table.\r |
c1f23d63 | 43 | \r |
6e8a984e | 44 | **/\r |
c84507ab | 45 | VOID\r |
46 | WriteIdtGateDescriptor (\r | |
6e8a984e | 47 | EFI_EXCEPTION_TYPE Vector,\r |
c84507ab | 48 | IA32_IDT_GATE_DESCRIPTOR *IdtGateDescriptor\r |
6e8a984e | 49 | )\r |
50 | {\r | |
51 | IA32_DESCRIPTOR IdtrValue;\r | |
52 | IA32_IDT_GATE_DESCRIPTOR *IdtTable;\r | |
c1f23d63 | 53 | \r |
6e8a984e | 54 | AsmReadIdtr (&IdtrValue);\r |
55 | IdtTable = (IA32_IDT_GATE_DESCRIPTOR *) IdtrValue.Base;\r | |
c1f23d63 | 56 | \r |
c84507ab | 57 | CopyMem ((VOID *) &(IdtTable)[Vector], (VOID *) IdtGateDescriptor, sizeof (IA32_IDT_GATE_DESCRIPTOR));\r |
c1f23d63 | 58 | }\r |
59 | \r | |
9e604fe4 | 60 | /**\r |
c1f23d63 | 61 | Creates a nes entry stub. Then saves the current IDT entry and replaces it\r |
62 | with an interrupt gate for the new entry point. The IdtEntryTable is updated\r | |
63 | with the new registered function.\r | |
64 | \r | |
65 | This code executes in boot services context. The stub entry executes in interrupt\r | |
66 | context.\r | |
67 | \r | |
9e604fe4 | 68 | @param ExceptionType Specifies which vector to hook.\r |
69 | @param NewCallback A pointer to the new function to be registered.\r | |
c1f23d63 | 70 | \r |
9e604fe4 | 71 | **/\r |
c84507ab | 72 | VOID\r |
9e604fe4 | 73 | HookEntry (\r |
74 | IN EFI_EXCEPTION_TYPE ExceptionType,\r | |
1ccdbf2a | 75 | IN CALLBACK_FUNC NewCallback\r |
9e604fe4 | 76 | )\r |
c1f23d63 | 77 | {\r |
78 | BOOLEAN OldIntFlagState;\r | |
c1f23d63 | 79 | \r |
c84507ab | 80 | CreateEntryStub (ExceptionType, (VOID **) &IdtEntryTable[ExceptionType].StubEntry);\r |
d1102dba | 81 | \r |
c84507ab | 82 | //\r |
83 | // Disables CPU interrupts and returns the previous interrupt state\r | |
84 | //\r | |
85 | OldIntFlagState = SaveAndDisableInterrupts ();\r | |
c1f23d63 | 86 | \r |
509bc208 | 87 | //\r |
88 | // gets IDT Gate descriptor by index\r | |
89 | //\r | |
c84507ab | 90 | ReadIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));\r |
509bc208 | 91 | //\r |
d1102dba | 92 | // stores orignal interrupt handle\r |
509bc208 | 93 | //\r |
c84507ab | 94 | IdtEntryTable[ExceptionType].OrigVector = (DEBUG_PROC) GetInterruptHandleFromIdt (&(IdtEntryTable[ExceptionType].OrigDesc));\r |
c1f23d63 | 95 | \r |
d1102dba LG |
96 | //\r |
97 | // encodes new IDT Gate descriptor by stub entry\r | |
509bc208 | 98 | //\r |
c84507ab | 99 | Vect2Desc (&IdtEntryTable[ExceptionType].NewDesc, IdtEntryTable[ExceptionType].StubEntry);\r |
509bc208 | 100 | //\r |
101 | // stores NewCallback\r | |
102 | //\r | |
c84507ab | 103 | IdtEntryTable[ExceptionType].RegisteredCallback = NewCallback;\r |
509bc208 | 104 | \r |
105 | //\r | |
106 | // writes back new IDT Gate descriptor\r | |
107 | //\r | |
c84507ab | 108 | WriteIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].NewDesc));\r |
109 | \r | |
110 | //\r | |
111 | // restore interrupt state\r | |
112 | //\r | |
113 | SetInterruptState (OldIntFlagState);\r | |
c1f23d63 | 114 | \r |
c84507ab | 115 | return ;\r |
c1f23d63 | 116 | }\r |
117 | \r | |
9e604fe4 | 118 | /**\r |
c1f23d63 | 119 | Undoes HookEntry. This code executes in boot services context.\r |
120 | \r | |
9e604fe4 | 121 | @param ExceptionType Specifies which entry to unhook\r |
c1f23d63 | 122 | \r |
9e604fe4 | 123 | **/\r |
c84507ab | 124 | VOID\r |
9e604fe4 | 125 | UnhookEntry (\r |
126 | IN EFI_EXCEPTION_TYPE ExceptionType\r | |
127 | )\r | |
c1f23d63 | 128 | {\r |
129 | BOOLEAN OldIntFlagState;\r | |
130 | \r | |
c84507ab | 131 | //\r |
132 | // Disables CPU interrupts and returns the previous interrupt state\r | |
133 | //\r | |
134 | OldIntFlagState = SaveAndDisableInterrupts ();\r | |
c1f23d63 | 135 | \r |
c84507ab | 136 | //\r |
137 | // restore the default IDT Date Descriptor\r | |
138 | //\r | |
139 | WriteIdtGateDescriptor (ExceptionType, &(IdtEntryTable[ExceptionType].OrigDesc));\r | |
140 | \r | |
141 | //\r | |
142 | // restore interrupt state\r | |
143 | //\r | |
144 | SetInterruptState (OldIntFlagState);\r | |
145 | \r | |
146 | return ;\r | |
c1f23d63 | 147 | }\r |
148 | \r | |
9e604fe4 | 149 | /**\r |
c84507ab | 150 | Returns the maximum value that may be used for the ProcessorIndex parameter in\r |
d1102dba LG |
151 | RegisterPeriodicCallback() and RegisterExceptionCallback().\r |
152 | \r | |
c84507ab | 153 | Hard coded to support only 1 processor for now.\r |
9e604fe4 | 154 | \r |
c84507ab | 155 | @param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.\r |
156 | @param MaxProcessorIndex Pointer to a caller-allocated UINTN in which the maximum supported\r | |
d1102dba LG |
157 | processor index is returned. Always 0 returned.\r |
158 | \r | |
c84507ab | 159 | @retval EFI_SUCCESS Always returned with **MaxProcessorIndex set to 0.\r |
9e604fe4 | 160 | \r |
161 | **/\r | |
c1f23d63 | 162 | EFI_STATUS\r |
163 | EFIAPI\r | |
164 | GetMaximumProcessorIndex (\r | |
165 | IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r | |
166 | OUT UINTN *MaxProcessorIndex\r | |
167 | )\r | |
c1f23d63 | 168 | {\r |
169 | *MaxProcessorIndex = 0;\r | |
c84507ab | 170 | return EFI_SUCCESS;\r |
c1f23d63 | 171 | }\r |
172 | \r | |
9e604fe4 | 173 | /**\r |
c84507ab | 174 | Registers a function to be called back periodically in interrupt context.\r |
d1102dba | 175 | \r |
c84507ab | 176 | @param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.\r |
177 | @param ProcessorIndex Specifies which processor the callback function applies to.\r | |
178 | @param PeriodicCallback A pointer to a function of type PERIODIC_CALLBACK that is the main\r | |
179 | periodic entry point of the debug agent.\r | |
d1102dba LG |
180 | \r |
181 | @retval EFI_SUCCESS The function completed successfully.\r | |
c84507ab | 182 | @retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a callback\r |
d1102dba LG |
183 | function was previously registered.\r |
184 | @retval EFI_OUT_OF_RESOURCES System has insufficient memory resources to register new callback\r | |
185 | function.\r | |
9e604fe4 | 186 | **/\r |
c1f23d63 | 187 | EFI_STATUS\r |
188 | EFIAPI\r | |
189 | RegisterPeriodicCallback (\r | |
190 | IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r | |
191 | IN UINTN ProcessorIndex,\r | |
192 | IN EFI_PERIODIC_CALLBACK PeriodicCallback\r | |
193 | )\r | |
9e604fe4 | 194 | {\r |
195 | return ManageIdtEntryTable (PeriodicCallback, SYSTEM_TIMER_VECTOR);\r | |
196 | }\r | |
c1f23d63 | 197 | \r |
9e604fe4 | 198 | /**\r |
c84507ab | 199 | Registers a function to be called when a given processor exception occurs.\r |
c1f23d63 | 200 | \r |
9e604fe4 | 201 | This code executes in boot services context.\r |
d1102dba | 202 | \r |
c84507ab | 203 | @param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.\r |
204 | @param ProcessorIndex Specifies which processor the callback function applies to.\r | |
205 | @param ExceptionCallback A pointer to a function of type EXCEPTION_CALLBACK that is called\r | |
d1102dba LG |
206 | when the processor exception specified by ExceptionType occurs.\r |
207 | @param ExceptionType Specifies which processor exception to hook.\r | |
208 | \r | |
209 | @retval EFI_SUCCESS The function completed successfully.\r | |
c84507ab | 210 | @retval EFI_ALREADY_STARTED Non-NULL PeriodicCallback parameter when a callback\r |
d1102dba LG |
211 | function was previously registered.\r |
212 | @retval EFI_OUT_OF_RESOURCES System has insufficient memory resources to register new callback\r | |
c84507ab | 213 | function.\r |
9e604fe4 | 214 | **/\r |
c1f23d63 | 215 | EFI_STATUS\r |
216 | EFIAPI\r | |
217 | RegisterExceptionCallback (\r | |
218 | IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r | |
219 | IN UINTN ProcessorIndex,\r | |
c84507ab | 220 | IN EFI_EXCEPTION_CALLBACK ExceptionCallback,\r |
c1f23d63 | 221 | IN EFI_EXCEPTION_TYPE ExceptionType\r |
222 | )\r | |
c1f23d63 | 223 | {\r |
c84507ab | 224 | return ManageIdtEntryTable (ExceptionCallback, ExceptionType);\r |
c1f23d63 | 225 | }\r |
226 | \r | |
509bc208 | 227 | \r |
9e604fe4 | 228 | /**\r |
c84507ab | 229 | Invalidates processor instruction cache for a memory range. Subsequent execution in this range\r |
d1102dba LG |
230 | causes a fresh memory fetch to retrieve code to be executed.\r |
231 | \r | |
c84507ab | 232 | @param This A pointer to the EFI_DEBUG_SUPPORT_PROTOCOL instance.\r |
233 | @param ProcessorIndex Specifies which processor's instruction cache is to be invalidated.\r | |
d1102dba | 234 | @param Start Specifies the physical base of the memory range to be invalidated.\r |
c84507ab | 235 | @param Length Specifies the minimum number of bytes in the processor's instruction\r |
d1102dba LG |
236 | cache to invalidate.\r |
237 | \r | |
c84507ab | 238 | @retval EFI_SUCCESS Always returned.\r |
9e604fe4 | 239 | \r |
240 | **/\r | |
c1f23d63 | 241 | EFI_STATUS\r |
242 | EFIAPI\r | |
243 | InvalidateInstructionCache (\r | |
244 | IN EFI_DEBUG_SUPPORT_PROTOCOL *This,\r | |
245 | IN UINTN ProcessorIndex,\r | |
246 | IN VOID *Start,\r | |
247 | IN UINT64 Length\r | |
248 | )\r | |
c1f23d63 | 249 | {\r |
250 | AsmWbinvd ();\r | |
251 | return EFI_SUCCESS;\r | |
252 | }\r | |
253 | \r | |
9e604fe4 | 254 | /**\r |
c84507ab | 255 | Common piece of code that invokes the registered handlers.\r |
9e604fe4 | 256 | \r |
c84507ab | 257 | This code executes in exception context so no efi calls are allowed.\r |
509bc208 | 258 | This code is called from assembly file.\r |
c84507ab | 259 | \r |
260 | @param ExceptionType Exception type\r | |
261 | @param ContextRecord System context\r | |
9e604fe4 | 262 | \r |
263 | **/\r | |
c84507ab | 264 | VOID\r |
265 | InterruptDistrubutionHub (\r | |
266 | EFI_EXCEPTION_TYPE ExceptionType,\r | |
267 | EFI_SYSTEM_CONTEXT_IA32 *ContextRecord\r | |
c1f23d63 | 268 | )\r |
c1f23d63 | 269 | {\r |
c84507ab | 270 | if (IdtEntryTable[ExceptionType].RegisteredCallback != NULL) {\r |
271 | if (ExceptionType != SYSTEM_TIMER_VECTOR) {\r | |
272 | IdtEntryTable[ExceptionType].RegisteredCallback (ExceptionType, ContextRecord);\r | |
273 | } else {\r | |
274 | OrigVector = IdtEntryTable[ExceptionType].OrigVector;\r | |
275 | IdtEntryTable[ExceptionType].RegisteredCallback (ContextRecord);\r | |
c1f23d63 | 276 | }\r |
277 | }\r | |
c1f23d63 | 278 | }\r |
279 | \r | |
9e604fe4 | 280 | /**\r |
c84507ab | 281 | This is the callback that is written to the Loaded Image protocol instance\r |
c1f23d63 | 282 | on the image handle. It uninstalls all registered handlers and frees all entry\r |
283 | stub memory.\r | |
284 | \r | |
9e604fe4 | 285 | @param ImageHandle The firmware allocated handle for the EFI image.\r |
c1f23d63 | 286 | \r |
9e604fe4 | 287 | @retval EFI_SUCCESS Always.\r |
c1f23d63 | 288 | \r |
9e604fe4 | 289 | **/\r |
290 | EFI_STATUS\r | |
291 | EFIAPI\r | |
292 | PlUnloadDebugSupportDriver (\r | |
293 | IN EFI_HANDLE ImageHandle\r | |
294 | )\r | |
c1f23d63 | 295 | {\r |
296 | EFI_EXCEPTION_TYPE ExceptionType;\r | |
297 | \r | |
298 | for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {\r | |
299 | ManageIdtEntryTable (NULL, ExceptionType);\r | |
c84507ab | 300 | //\r |
301 | // Free space for each Interrupt Stub precedure.\r | |
302 | //\r | |
303 | if (IdtEntryTable[ExceptionType].StubEntry != NULL) {\r | |
304 | FreePool ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);\r | |
305 | }\r | |
c1f23d63 | 306 | }\r |
307 | \r | |
308 | FreePool (IdtEntryTable);\r | |
c84507ab | 309 | \r |
c1f23d63 | 310 | return EFI_SUCCESS;\r |
311 | }\r | |
312 | \r | |
9e604fe4 | 313 | /**\r |
d1102dba LG |
314 | Initializes driver's handler registration database.\r |
315 | \r | |
c84507ab | 316 | This code executes in boot services context.\r |
317 | Must be public because it's referenced from DebugSupport.c\r | |
9e604fe4 | 318 | \r |
c84507ab | 319 | @retval EFI_UNSUPPORTED If IA32/x64 processor does not support FXSTOR/FXRSTOR instructions,\r |
320 | the context save will fail, so these processors are not supported.\r | |
321 | @retval EFI_OUT_OF_RESOURCES Fails to allocate memory.\r | |
322 | @retval EFI_SUCCESS Initializes successfully.\r | |
9e604fe4 | 323 | \r |
324 | **/\r | |
c84507ab | 325 | EFI_STATUS\r |
326 | PlInitializeDebugSupportDriver (\r | |
327 | VOID\r | |
c1f23d63 | 328 | )\r |
c1f23d63 | 329 | {\r |
c84507ab | 330 | EFI_EXCEPTION_TYPE ExceptionType;\r |
331 | \r | |
332 | //\r | |
333 | // Check whether FxStor instructions are supported.\r | |
334 | //\r | |
335 | if (!FxStorSupport ()) {\r | |
336 | return EFI_UNSUPPORTED;\r | |
337 | }\r | |
338 | \r | |
339 | IdtEntryTable = AllocateZeroPool (sizeof (IDT_ENTRY) * NUM_IDT_ENTRIES);\r | |
340 | if (IdtEntryTable == NULL) {\r | |
341 | return EFI_OUT_OF_RESOURCES;\r | |
342 | }\r | |
343 | \r | |
344 | for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType ++) {\r | |
345 | IdtEntryTable[ExceptionType].StubEntry = (DEBUG_PROC) (UINTN) AllocatePool (StubSize);\r | |
346 | if (IdtEntryTable[ExceptionType].StubEntry == NULL) {\r | |
347 | goto ErrorCleanup;\r | |
348 | }\r | |
d1102dba | 349 | \r |
c84507ab | 350 | //\r |
351 | // Copy Interrupt stub code.\r | |
352 | //\r | |
353 | CopyMem ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry, InterruptEntryStub, StubSize);\r | |
354 | }\r | |
355 | return EFI_SUCCESS;\r | |
356 | \r | |
357 | ErrorCleanup:\r | |
358 | \r | |
359 | for (ExceptionType = 0; ExceptionType < NUM_IDT_ENTRIES; ExceptionType++) {\r | |
360 | if (IdtEntryTable[ExceptionType].StubEntry != NULL) {\r | |
361 | FreePool ((VOID *)(UINTN)IdtEntryTable[ExceptionType].StubEntry);\r | |
c1f23d63 | 362 | }\r |
363 | }\r | |
c84507ab | 364 | FreePool (IdtEntryTable);\r |
365 | \r | |
366 | return EFI_OUT_OF_RESOURCES;\r | |
c1f23d63 | 367 | }\r |