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1 | /** @file\r | |
2 | CPU DXE Module.\r | |
3 | \r | |
4 | Copyright (c) 2008 - 2014, 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 "CpuDxe.h"\r | |
16 | #include "CpuMp.h"\r | |
17 | \r | |
18 | UINTN gMaxLogicalProcessorNumber;\r | |
19 | UINTN gApStackSize;\r | |
20 | \r | |
21 | MP_SYSTEM_DATA mMpSystemData;\r | |
22 | \r | |
23 | VOID *mCommonStack = 0;\r | |
24 | VOID *mTopOfApCommonStack = 0;\r | |
25 | VOID *mApStackStart = 0;\r | |
26 | \r | |
27 | EFI_MP_SERVICES_PROTOCOL mMpServicesTemplate = {\r | |
28 | GetNumberOfProcessors,\r | |
29 | GetProcessorInfo,\r | |
30 | NULL, // StartupAllAPs,\r | |
31 | NULL, // StartupThisAP,\r | |
32 | NULL, // SwitchBSP,\r | |
33 | EnableDisableAP,\r | |
34 | WhoAmI\r | |
35 | };\r | |
36 | \r | |
37 | /**\r | |
38 | Check whether caller processor is BSP.\r | |
39 | \r | |
40 | @retval TRUE the caller is BSP\r | |
41 | @retval FALSE the caller is AP\r | |
42 | \r | |
43 | **/\r | |
44 | BOOLEAN\r | |
45 | IsBSP (\r | |
46 | VOID\r | |
47 | )\r | |
48 | {\r | |
49 | UINTN CpuIndex;\r | |
50 | CPU_DATA_BLOCK *CpuData;\r | |
51 | \r | |
52 | CpuData = NULL;\r | |
53 | \r | |
54 | WhoAmI (&mMpServicesTemplate, &CpuIndex);\r | |
55 | CpuData = &mMpSystemData.CpuDatas[CpuIndex];\r | |
56 | \r | |
57 | return CpuData->Info.StatusFlag & PROCESSOR_AS_BSP_BIT ? TRUE : FALSE;\r | |
58 | }\r | |
59 | \r | |
60 | /**\r | |
61 | Get the Application Processors state.\r | |
62 | \r | |
63 | @param CpuData the pointer to CPU_DATA_BLOCK of specified AP\r | |
64 | \r | |
65 | @retval CPU_STATE the AP status\r | |
66 | \r | |
67 | **/\r | |
68 | CPU_STATE\r | |
69 | GetApState (\r | |
70 | IN CPU_DATA_BLOCK *CpuData\r | |
71 | )\r | |
72 | {\r | |
73 | CPU_STATE State;\r | |
74 | \r | |
75 | while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {\r | |
76 | CpuPause ();\r | |
77 | }\r | |
78 | \r | |
79 | State = CpuData->State;\r | |
80 | ReleaseSpinLock (&CpuData->CpuDataLock);\r | |
81 | \r | |
82 | return State;\r | |
83 | }\r | |
84 | \r | |
85 | /**\r | |
86 | Check the Application Processors Status whether contains the Flags.\r | |
87 | \r | |
88 | @param CpuData the pointer to CPU_DATA_BLOCK of specified AP\r | |
89 | @param Flags the StatusFlag describing in EFI_PROCESSOR_INFORMATION\r | |
90 | \r | |
91 | @retval TRUE the AP status includes the StatusFlag\r | |
92 | @retval FALSE the AP status excludes the StatusFlag\r | |
93 | \r | |
94 | **/\r | |
95 | BOOLEAN\r | |
96 | TestCpuStatusFlag (\r | |
97 | IN CPU_DATA_BLOCK *CpuData,\r | |
98 | IN UINT32 Flags\r | |
99 | )\r | |
100 | {\r | |
101 | UINT32 Ret;\r | |
102 | \r | |
103 | while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {\r | |
104 | CpuPause ();\r | |
105 | }\r | |
106 | \r | |
107 | Ret = CpuData->Info.StatusFlag & Flags;\r | |
108 | ReleaseSpinLock (&CpuData->CpuDataLock);\r | |
109 | \r | |
110 | return !!(Ret);\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Bitwise-Or of the Application Processors Status with the Flags.\r | |
115 | \r | |
116 | @param CpuData the pointer to CPU_DATA_BLOCK of specified AP\r | |
117 | @param Flags the StatusFlag describing in EFI_PROCESSOR_INFORMATION\r | |
118 | \r | |
119 | **/\r | |
120 | VOID\r | |
121 | CpuStatusFlagOr (\r | |
122 | IN CPU_DATA_BLOCK *CpuData,\r | |
123 | IN UINT32 Flags\r | |
124 | )\r | |
125 | {\r | |
126 | while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {\r | |
127 | CpuPause ();\r | |
128 | }\r | |
129 | \r | |
130 | CpuData->Info.StatusFlag |= Flags;\r | |
131 | ReleaseSpinLock (&CpuData->CpuDataLock);\r | |
132 | }\r | |
133 | \r | |
134 | /**\r | |
135 | Bitwise-AndNot of the Application Processors Status with the Flags.\r | |
136 | \r | |
137 | @param CpuData the pointer to CPU_DATA_BLOCK of specified AP\r | |
138 | @param Flags the StatusFlag describing in EFI_PROCESSOR_INFORMATION\r | |
139 | \r | |
140 | **/\r | |
141 | VOID\r | |
142 | CpuStatusFlagAndNot (\r | |
143 | IN CPU_DATA_BLOCK *CpuData,\r | |
144 | IN UINT32 Flags\r | |
145 | )\r | |
146 | {\r | |
147 | while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {\r | |
148 | CpuPause ();\r | |
149 | }\r | |
150 | \r | |
151 | CpuData->Info.StatusFlag &= ~Flags;\r | |
152 | ReleaseSpinLock (&CpuData->CpuDataLock);\r | |
153 | }\r | |
154 | \r | |
155 | /**\r | |
156 | This service retrieves the number of logical processor in the platform\r | |
157 | and the number of those logical processors that are enabled on this boot.\r | |
158 | This service may only be called from the BSP.\r | |
159 | \r | |
160 | This function is used to retrieve the following information:\r | |
161 | - The number of logical processors that are present in the system.\r | |
162 | - The number of enabled logical processors in the system at the instant\r | |
163 | this call is made.\r | |
164 | \r | |
165 | Because MP Service Protocol provides services to enable and disable processors\r | |
166 | dynamically, the number of enabled logical processors may vary during the\r | |
167 | course of a boot session.\r | |
168 | \r | |
169 | If this service is called from an AP, then EFI_DEVICE_ERROR is returned.\r | |
170 | If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then\r | |
171 | EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors\r | |
172 | is returned in NumberOfProcessors, the number of currently enabled processor\r | |
173 | is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.\r | |
174 | \r | |
175 | @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r | |
176 | instance.\r | |
177 | @param[out] NumberOfProcessors Pointer to the total number of logical\r | |
178 | processors in the system, including the BSP\r | |
179 | and disabled APs.\r | |
180 | @param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical\r | |
181 | processors that exist in system, including\r | |
182 | the BSP.\r | |
183 | \r | |
184 | @retval EFI_SUCCESS The number of logical processors and enabled\r | |
185 | logical processors was retrieved.\r | |
186 | @retval EFI_DEVICE_ERROR The calling processor is an AP.\r | |
187 | @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.\r | |
188 | @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.\r | |
189 | \r | |
190 | **/\r | |
191 | EFI_STATUS\r | |
192 | EFIAPI\r | |
193 | GetNumberOfProcessors (\r | |
194 | IN EFI_MP_SERVICES_PROTOCOL *This,\r | |
195 | OUT UINTN *NumberOfProcessors,\r | |
196 | OUT UINTN *NumberOfEnabledProcessors\r | |
197 | )\r | |
198 | {\r | |
199 | if ((NumberOfProcessors == NULL) || (NumberOfEnabledProcessors == NULL)) {\r | |
200 | return EFI_INVALID_PARAMETER;\r | |
201 | }\r | |
202 | \r | |
203 | if (!IsBSP ()) {\r | |
204 | return EFI_DEVICE_ERROR;\r | |
205 | }\r | |
206 | \r | |
207 | *NumberOfProcessors = mMpSystemData.NumberOfProcessors;\r | |
208 | *NumberOfEnabledProcessors = mMpSystemData.NumberOfEnabledProcessors;\r | |
209 | return EFI_SUCCESS;\r | |
210 | }\r | |
211 | \r | |
212 | /**\r | |
213 | Gets detailed MP-related information on the requested processor at the\r | |
214 | instant this call is made. This service may only be called from the BSP.\r | |
215 | \r | |
216 | This service retrieves detailed MP-related information about any processor\r | |
217 | on the platform. Note the following:\r | |
218 | - The processor information may change during the course of a boot session.\r | |
219 | - The information presented here is entirely MP related.\r | |
220 | \r | |
221 | Information regarding the number of caches and their sizes, frequency of operation,\r | |
222 | slot numbers is all considered platform-related information and is not provided\r | |
223 | by this service.\r | |
224 | \r | |
225 | @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r | |
226 | instance.\r | |
227 | @param[in] ProcessorNumber The handle number of processor.\r | |
228 | @param[out] ProcessorInfoBuffer A pointer to the buffer where information for\r | |
229 | the requested processor is deposited.\r | |
230 | \r | |
231 | @retval EFI_SUCCESS Processor information was returned.\r | |
232 | @retval EFI_DEVICE_ERROR The calling processor is an AP.\r | |
233 | @retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.\r | |
234 | @retval EFI_NOT_FOUND The processor with the handle specified by\r | |
235 | ProcessorNumber does not exist in the platform.\r | |
236 | \r | |
237 | **/\r | |
238 | EFI_STATUS\r | |
239 | EFIAPI\r | |
240 | GetProcessorInfo (\r | |
241 | IN EFI_MP_SERVICES_PROTOCOL *This,\r | |
242 | IN UINTN ProcessorNumber,\r | |
243 | OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer\r | |
244 | )\r | |
245 | {\r | |
246 | if (ProcessorInfoBuffer == NULL) {\r | |
247 | return EFI_INVALID_PARAMETER;\r | |
248 | }\r | |
249 | \r | |
250 | if (!IsBSP ()) {\r | |
251 | return EFI_DEVICE_ERROR;\r | |
252 | }\r | |
253 | \r | |
254 | if (ProcessorNumber >= mMpSystemData.NumberOfProcessors) {\r | |
255 | return EFI_NOT_FOUND;\r | |
256 | }\r | |
257 | \r | |
258 | CopyMem (ProcessorInfoBuffer, &mMpSystemData.CpuDatas[ProcessorNumber], sizeof (EFI_PROCESSOR_INFORMATION));\r | |
259 | return EFI_SUCCESS;\r | |
260 | }\r | |
261 | \r | |
262 | /**\r | |
263 | This service lets the caller enable or disable an AP from this point onward.\r | |
264 | This service may only be called from the BSP.\r | |
265 | \r | |
266 | This service allows the caller enable or disable an AP from this point onward.\r | |
267 | The caller can optionally specify the health status of the AP by Health. If\r | |
268 | an AP is being disabled, then the state of the disabled AP is implementation\r | |
269 | dependent. If an AP is enabled, then the implementation must guarantee that a\r | |
270 | complete initialization sequence is performed on the AP, so the AP is in a state\r | |
271 | that is compatible with an MP operating system. This service may not be supported\r | |
272 | after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.\r | |
273 | \r | |
274 | If the enable or disable AP operation cannot be completed prior to the return\r | |
275 | from this service, then EFI_UNSUPPORTED must be returned.\r | |
276 | \r | |
277 | @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r | |
278 | @param[in] ProcessorNumber The handle number of AP that is to become the new\r | |
279 | BSP. The range is from 0 to the total number of\r | |
280 | logical processors minus 1. The total number of\r | |
281 | logical processors can be retrieved by\r | |
282 | EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r | |
283 | @param[in] EnableAP Specifies the new state for the processor for\r | |
284 | enabled, FALSE for disabled.\r | |
285 | @param[in] HealthFlag If not NULL, a pointer to a value that specifies\r | |
286 | the new health status of the AP. This flag\r | |
287 | corresponds to StatusFlag defined in\r | |
288 | EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only\r | |
289 | the PROCESSOR_HEALTH_STATUS_BIT is used. All other\r | |
290 | bits are ignored. If it is NULL, this parameter\r | |
291 | is ignored.\r | |
292 | \r | |
293 | @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.\r | |
294 | @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed\r | |
295 | prior to this service returning.\r | |
296 | @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.\r | |
297 | @retval EFI_DEVICE_ERROR The calling processor is an AP.\r | |
298 | @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber\r | |
299 | does not exist.\r | |
300 | @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.\r | |
301 | \r | |
302 | **/\r | |
303 | EFI_STATUS\r | |
304 | EFIAPI\r | |
305 | EnableDisableAP (\r | |
306 | IN EFI_MP_SERVICES_PROTOCOL *This,\r | |
307 | IN UINTN ProcessorNumber,\r | |
308 | IN BOOLEAN EnableAP,\r | |
309 | IN UINT32 *HealthFlag OPTIONAL\r | |
310 | )\r | |
311 | {\r | |
312 | CPU_DATA_BLOCK *CpuData;\r | |
313 | \r | |
314 | if (!IsBSP ()) {\r | |
315 | return EFI_DEVICE_ERROR;\r | |
316 | }\r | |
317 | \r | |
318 | if (ProcessorNumber >= mMpSystemData.NumberOfProcessors) {\r | |
319 | return EFI_NOT_FOUND;\r | |
320 | }\r | |
321 | \r | |
322 | CpuData = &mMpSystemData.CpuDatas[ProcessorNumber];\r | |
323 | if (TestCpuStatusFlag (CpuData, PROCESSOR_AS_BSP_BIT)) {\r | |
324 | return EFI_INVALID_PARAMETER;\r | |
325 | }\r | |
326 | \r | |
327 | if (GetApState (CpuData) != CpuStateIdle) {\r | |
328 | return EFI_UNSUPPORTED;\r | |
329 | }\r | |
330 | \r | |
331 | if (EnableAP) {\r | |
332 | if (!(TestCpuStatusFlag (CpuData, PROCESSOR_ENABLED_BIT))) {\r | |
333 | mMpSystemData.NumberOfEnabledProcessors++;\r | |
334 | }\r | |
335 | CpuStatusFlagOr (CpuData, PROCESSOR_ENABLED_BIT);\r | |
336 | } else {\r | |
337 | if (TestCpuStatusFlag (CpuData, PROCESSOR_ENABLED_BIT)) {\r | |
338 | mMpSystemData.NumberOfEnabledProcessors--;\r | |
339 | }\r | |
340 | CpuStatusFlagAndNot (CpuData, PROCESSOR_ENABLED_BIT);\r | |
341 | }\r | |
342 | \r | |
343 | if (HealthFlag != NULL) {\r | |
344 | CpuStatusFlagAndNot (CpuData, (UINT32)~PROCESSOR_HEALTH_STATUS_BIT);\r | |
345 | CpuStatusFlagOr (CpuData, (*HealthFlag & PROCESSOR_HEALTH_STATUS_BIT));\r | |
346 | }\r | |
347 | \r | |
348 | return EFI_SUCCESS;\r | |
349 | }\r | |
350 | \r | |
351 | /**\r | |
352 | This return the handle number for the calling processor. This service may be\r | |
353 | called from the BSP and APs.\r | |
354 | \r | |
355 | This service returns the processor handle number for the calling processor.\r | |
356 | The returned value is in the range from 0 to the total number of logical\r | |
357 | processors minus 1. The total number of logical processors can be retrieved\r | |
358 | with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be\r | |
359 | called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER\r | |
360 | is returned. Otherwise, the current processors handle number is returned in\r | |
361 | ProcessorNumber, and EFI_SUCCESS is returned.\r | |
362 | \r | |
363 | @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r | |
364 | @param[out] ProcessorNumber The handle number of AP that is to become the new\r | |
365 | BSP. The range is from 0 to the total number of\r | |
366 | logical processors minus 1. The total number of\r | |
367 | logical processors can be retrieved by\r | |
368 | EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r | |
369 | \r | |
370 | @retval EFI_SUCCESS The current processor handle number was returned\r | |
371 | in ProcessorNumber.\r | |
372 | @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.\r | |
373 | \r | |
374 | **/\r | |
375 | EFI_STATUS\r | |
376 | EFIAPI\r | |
377 | WhoAmI (\r | |
378 | IN EFI_MP_SERVICES_PROTOCOL *This,\r | |
379 | OUT UINTN *ProcessorNumber\r | |
380 | )\r | |
381 | {\r | |
382 | UINTN Index;\r | |
383 | UINT32 ProcessorId;\r | |
384 | \r | |
385 | if (ProcessorNumber == NULL) {\r | |
386 | return EFI_INVALID_PARAMETER;\r | |
387 | }\r | |
388 | \r | |
389 | ProcessorId = GetApicId ();\r | |
390 | for (Index = 0; Index < mMpSystemData.NumberOfProcessors; Index++) {\r | |
391 | if (mMpSystemData.CpuDatas[Index].Info.ProcessorId == ProcessorId) {\r | |
392 | break;\r | |
393 | }\r | |
394 | }\r | |
395 | \r | |
396 | *ProcessorNumber = Index;\r | |
397 | return EFI_SUCCESS;\r | |
398 | }\r | |
399 | \r | |
400 | /**\r | |
401 | Application Processors do loop routine\r | |
402 | after switch to its own stack.\r | |
403 | \r | |
404 | @param Context1 A pointer to the context to pass into the function.\r | |
405 | @param Context2 A pointer to the context to pass into the function.\r | |
406 | \r | |
407 | **/\r | |
408 | VOID\r | |
409 | ProcessorToIdleState (\r | |
410 | IN VOID *Context1, OPTIONAL\r | |
411 | IN VOID *Context2 OPTIONAL\r | |
412 | )\r | |
413 | {\r | |
414 | DEBUG ((DEBUG_INFO, "Ap apicid is %d\n", GetApicId ()));\r | |
415 | \r | |
416 | AsmApDoneWithCommonStack ();\r | |
417 | \r | |
418 | CpuSleep ();\r | |
419 | CpuDeadLoop ();\r | |
420 | }\r | |
421 | \r | |
422 | /**\r | |
423 | Application Processor C code entry point.\r | |
424 | \r | |
425 | **/\r | |
426 | VOID\r | |
427 | EFIAPI\r | |
428 | ApEntryPointInC (\r | |
429 | VOID\r | |
430 | )\r | |
431 | {\r | |
432 | VOID* TopOfApStack;\r | |
433 | \r | |
434 | FillInProcessorInformation (FALSE, mMpSystemData.NumberOfProcessors);\r | |
435 | TopOfApStack = (UINT8*)mApStackStart + gApStackSize;\r | |
436 | mApStackStart = TopOfApStack;\r | |
437 | \r | |
438 | mMpSystemData.NumberOfProcessors++;\r | |
439 | \r | |
440 | SwitchStack (\r | |
441 | (SWITCH_STACK_ENTRY_POINT)(UINTN)ProcessorToIdleState,\r | |
442 | NULL,\r | |
443 | NULL,\r | |
444 | TopOfApStack);\r | |
445 | }\r | |
446 | \r | |
447 | /**\r | |
448 | This function is called by all processors (both BSP and AP) once and collects MP related data.\r | |
449 | \r | |
450 | @param Bsp TRUE if the CPU is BSP\r | |
451 | @param ProcessorNumber The specific processor number\r | |
452 | \r | |
453 | @retval EFI_SUCCESS Data for the processor collected and filled in\r | |
454 | \r | |
455 | **/\r | |
456 | EFI_STATUS\r | |
457 | FillInProcessorInformation (\r | |
458 | IN BOOLEAN Bsp,\r | |
459 | IN UINTN ProcessorNumber\r | |
460 | )\r | |
461 | {\r | |
462 | CPU_DATA_BLOCK *CpuData;\r | |
463 | UINT32 ProcessorId;\r | |
464 | \r | |
465 | CpuData = &mMpSystemData.CpuDatas[ProcessorNumber];\r | |
466 | ProcessorId = GetApicId ();\r | |
467 | CpuData->Info.ProcessorId = ProcessorId;\r | |
468 | CpuData->Info.StatusFlag = PROCESSOR_ENABLED_BIT | PROCESSOR_HEALTH_STATUS_BIT;\r | |
469 | if (Bsp) {\r | |
470 | CpuData->Info.StatusFlag |= PROCESSOR_AS_BSP_BIT;\r | |
471 | }\r | |
472 | CpuData->Info.Location.Package = ProcessorId;\r | |
473 | CpuData->Info.Location.Core = 0;\r | |
474 | CpuData->Info.Location.Thread = 0;\r | |
475 | CpuData->State = Bsp ? CpuStateBuzy : CpuStateIdle;\r | |
476 | \r | |
477 | CpuData->Procedure = NULL;\r | |
478 | CpuData->Parameter = NULL;\r | |
479 | InitializeSpinLock (&CpuData->CpuDataLock);\r | |
480 | \r | |
481 | return EFI_SUCCESS;\r | |
482 | }\r | |
483 | \r | |
484 | /**\r | |
485 | Prepare the System Data.\r | |
486 | \r | |
487 | @retval EFI_SUCCESS the System Data finished initilization.\r | |
488 | \r | |
489 | **/\r | |
490 | EFI_STATUS\r | |
491 | InitMpSystemData (\r | |
492 | VOID\r | |
493 | )\r | |
494 | {\r | |
495 | ZeroMem (&mMpSystemData, sizeof (MP_SYSTEM_DATA));\r | |
496 | \r | |
497 | mMpSystemData.NumberOfProcessors = 1;\r | |
498 | mMpSystemData.NumberOfEnabledProcessors = 1;\r | |
499 | \r | |
500 | mMpSystemData.CpuDatas = AllocateZeroPool (sizeof (CPU_DATA_BLOCK) * gMaxLogicalProcessorNumber);\r | |
501 | ASSERT(mMpSystemData.CpuDatas != NULL);\r | |
502 | \r | |
503 | //\r | |
504 | // BSP\r | |
505 | //\r | |
506 | FillInProcessorInformation (TRUE, 0);\r | |
507 | \r | |
508 | return EFI_SUCCESS;\r | |
509 | }\r | |
510 | \r | |
511 | /**\r | |
512 | Initialize Multi-processor support.\r | |
513 | \r | |
514 | **/\r | |
515 | VOID\r | |
516 | InitializeMpSupport (\r | |
517 | VOID\r | |
518 | )\r | |
519 | {\r | |
520 | gMaxLogicalProcessorNumber = (UINTN) PcdGet32 (PcdCpuMaxLogicalProcessorNumber);\r | |
521 | if (gMaxLogicalProcessorNumber < 1) {\r | |
522 | DEBUG ((DEBUG_ERROR, "Setting PcdCpuMaxLogicalProcessorNumber should be more than zero.\n"));\r | |
523 | return;\r | |
524 | }\r | |
525 | \r | |
526 | if (gMaxLogicalProcessorNumber == 1) {\r | |
527 | return;\r | |
528 | }\r | |
529 | \r | |
530 | gApStackSize = (UINTN) PcdGet32 (PcdCpuApStackSize);\r | |
531 | ASSERT ((gApStackSize & (SIZE_4KB - 1)) == 0);\r | |
532 | \r | |
533 | mApStackStart = AllocatePages (EFI_SIZE_TO_PAGES (gMaxLogicalProcessorNumber * gApStackSize));\r | |
534 | ASSERT (mApStackStart != NULL);\r | |
535 | \r | |
536 | //\r | |
537 | // the first buffer of stack size used for common stack, when the amount of AP\r | |
538 | // more than 1, we should never free the common stack which maybe used for AP reset.\r | |
539 | //\r | |
540 | mCommonStack = mApStackStart;\r | |
541 | mTopOfApCommonStack = (UINT8*) mApStackStart + gApStackSize;\r | |
542 | mApStackStart = mTopOfApCommonStack;\r | |
543 | \r | |
544 | InitMpSystemData ();\r | |
545 | \r | |
546 | if (mMpSystemData.NumberOfProcessors == 1) {\r | |
547 | FreePages (mCommonStack, EFI_SIZE_TO_PAGES (gMaxLogicalProcessorNumber * gApStackSize));\r | |
548 | return;\r | |
549 | }\r | |
550 | \r | |
551 | if (mMpSystemData.NumberOfProcessors < gMaxLogicalProcessorNumber) {\r | |
552 | FreePages (mApStackStart, EFI_SIZE_TO_PAGES (\r | |
553 | (gMaxLogicalProcessorNumber - mMpSystemData.NumberOfProcessors) *\r | |
554 | gApStackSize));\r | |
555 | }\r | |
556 | }\r |