)\r
{\r
UINTN Index;\r
+ CPU_INFO_IN_HOB *CpuInfoInHob;\r
+ BOOLEAN X2Apic;\r
\r
//\r
// Send 1st broadcast IPI to APs to wakeup APs\r
//\r
- CpuMpData->InitFlag = ApInitConfig;\r
- CpuMpData->X2ApicEnable = FALSE;\r
+ CpuMpData->InitFlag = ApInitConfig;\r
WakeUpAP (CpuMpData, TRUE, 0, NULL, NULL, TRUE);\r
CpuMpData->InitFlag = ApInitDone;\r
ASSERT (CpuMpData->CpuCount <= PcdGet32 (PcdCpuMaxLogicalProcessorNumber));\r
CpuPause ();\r
}\r
\r
+\r
+ //\r
+ // Enable x2APIC mode if\r
+ // 1. Number of CPU is greater than 255; or\r
+ // 2. There are any logical processors reporting an Initial APIC ID of 255 or greater.\r
+ //\r
+ X2Apic = FALSE;\r
if (CpuMpData->CpuCount > 255) {\r
//\r
// If there are more than 255 processor found, force to enable X2APIC\r
//\r
- CpuMpData->X2ApicEnable = TRUE;\r
+ X2Apic = TRUE;\r
+ } else {\r
+ CpuInfoInHob = (CPU_INFO_IN_HOB *) (UINTN) CpuMpData->CpuInfoInHob;\r
+ for (Index = 0; Index < CpuMpData->CpuCount; Index++) {\r
+ if (CpuInfoInHob[Index].InitialApicId >= 0xFF) {\r
+ X2Apic = TRUE;\r
+ break;\r
+ }\r
+ }\r
}\r
- if (CpuMpData->X2ApicEnable) {\r
+\r
+ if (X2Apic) {\r
DEBUG ((DEBUG_INFO, "Force x2APIC mode!\n"));\r
//\r
// Wakeup all APs to enable x2APIC mode\r
\r
CpuMpData->CpuData[ProcessorNumber].Waiting = FALSE;\r
CpuMpData->CpuData[ProcessorNumber].CpuHealthy = (BistData == 0) ? TRUE : FALSE;\r
- if (CpuInfoInHob[ProcessorNumber].InitialApicId >= 0xFF) {\r
- //\r
- // Set x2APIC mode if there are any logical processor reporting\r
- // an Initial APIC ID of 255 or greater.\r
- //\r
- AcquireSpinLock(&CpuMpData->MpLock);\r
- CpuMpData->X2ApicEnable = TRUE;\r
- ReleaseSpinLock(&CpuMpData->MpLock);\r
- }\r
\r
InitializeSpinLock(&CpuMpData->CpuData[ProcessorNumber].ApLock);\r
SetApState (&CpuMpData->CpuData[ProcessorNumber], CpuStateIdle);\r
SendInitSipiSipiAllExcludingSelf ((UINT32) ExchangeInfo->BufferStart);\r
}\r
if (CpuMpData->InitFlag == ApInitConfig) {\r
- //\r
- // The AP enumeration algorithm below is suitable for two use cases.\r
- //\r
- // (1) The check-in time for an individual AP is bounded, and APs run\r
- // through their initialization routines strongly concurrently. In\r
- // particular, the number of concurrently running APs\r
- // ("NumApsExecuting") is never expected to fall to zero\r
- // *temporarily* -- it is expected to fall to zero only when all\r
- // APs have checked-in.\r
- //\r
- // In this case, the platform is supposed to set\r
- // PcdCpuApInitTimeOutInMicroSeconds to a low-ish value (just long\r
- // enough for one AP to start initialization). The timeout will be\r
- // reached soon, and remaining APs are collected by watching\r
- // NumApsExecuting fall to zero. If NumApsExecuting falls to zero\r
- // mid-process, while some APs have not completed initialization,\r
- // the behavior is undefined.\r
- //\r
- // (2) The check-in time for an individual AP is unbounded, and/or APs\r
- // may complete their initializations widely spread out. In\r
- // particular, some APs may finish initialization before some APs\r
- // even start.\r
- //\r
- // In this case, the platform is supposed to set\r
- // PcdCpuApInitTimeOutInMicroSeconds to a high-ish value. The AP\r
- // enumeration will always take that long (except when the boot CPU\r
- // count happens to be maximal, that is,\r
- // PcdCpuMaxLogicalProcessorNumber). All APs are expected to\r
- // check-in before the timeout, and NumApsExecuting is assumed zero\r
- // at timeout. APs that miss the time-out may cause undefined\r
- // behavior.\r
- //\r
- TimedWaitForApFinish (\r
- CpuMpData,\r
- PcdGet32 (PcdCpuMaxLogicalProcessorNumber) - 1,\r
- PcdGet32 (PcdCpuApInitTimeOutInMicroSeconds)\r
- );\r
+ if (PcdGet32 (PcdCpuBootLogicalProcessorNumber) > 0) {\r
+ //\r
+ // The AP enumeration algorithm below is suitable only when the\r
+ // platform can tell us the *exact* boot CPU count in advance.\r
+ //\r
+ // The wait below finishes only when the detected AP count reaches\r
+ // (PcdCpuBootLogicalProcessorNumber - 1), regardless of how long that\r
+ // takes. If at least one AP fails to check in (meaning a platform\r
+ // hardware bug), the detection hangs forever, by design. If the actual\r
+ // boot CPU count in the system is higher than\r
+ // PcdCpuBootLogicalProcessorNumber (meaning a platform\r
+ // misconfiguration), then some APs may complete initialization after\r
+ // the wait finishes, and cause undefined behavior.\r
+ //\r
+ TimedWaitForApFinish (\r
+ CpuMpData,\r
+ PcdGet32 (PcdCpuBootLogicalProcessorNumber) - 1,\r
+ MAX_UINT32 // approx. 71 minutes\r
+ );\r
+ } else {\r
+ //\r
+ // The AP enumeration algorithm below is suitable for two use cases.\r
+ //\r
+ // (1) The check-in time for an individual AP is bounded, and APs run\r
+ // through their initialization routines strongly concurrently. In\r
+ // particular, the number of concurrently running APs\r
+ // ("NumApsExecuting") is never expected to fall to zero\r
+ // *temporarily* -- it is expected to fall to zero only when all\r
+ // APs have checked-in.\r
+ //\r
+ // In this case, the platform is supposed to set\r
+ // PcdCpuApInitTimeOutInMicroSeconds to a low-ish value (just long\r
+ // enough for one AP to start initialization). The timeout will be\r
+ // reached soon, and remaining APs are collected by watching\r
+ // NumApsExecuting fall to zero. If NumApsExecuting falls to zero\r
+ // mid-process, while some APs have not completed initialization,\r
+ // the behavior is undefined.\r
+ //\r
+ // (2) The check-in time for an individual AP is unbounded, and/or APs\r
+ // may complete their initializations widely spread out. In\r
+ // particular, some APs may finish initialization before some APs\r
+ // even start.\r
+ //\r
+ // In this case, the platform is supposed to set\r
+ // PcdCpuApInitTimeOutInMicroSeconds to a high-ish value. The AP\r
+ // enumeration will always take that long (except when the boot CPU\r
+ // count happens to be maximal, that is,\r
+ // PcdCpuMaxLogicalProcessorNumber). All APs are expected to\r
+ // check-in before the timeout, and NumApsExecuting is assumed zero\r
+ // at timeout. APs that miss the time-out may cause undefined\r
+ // behavior.\r
+ //\r
+ TimedWaitForApFinish (\r
+ CpuMpData,\r
+ PcdGet32 (PcdCpuMaxLogicalProcessorNumber) - 1,\r
+ PcdGet32 (PcdCpuApInitTimeOutInMicroSeconds)\r
+ );\r
\r
- while (CpuMpData->MpCpuExchangeInfo->NumApsExecuting != 0) {\r
- CpuPause();\r
+ while (CpuMpData->MpCpuExchangeInfo->NumApsExecuting != 0) {\r
+ CpuPause();\r
+ }\r
}\r
} else {\r
//\r
CpuInfoInHob = (CPU_INFO_IN_HOB *) (UINTN) CpuMpData->CpuInfoInHob;\r
for (Index = 0; Index < CpuMpData->CpuCount; Index++) {\r
InitializeSpinLock(&CpuMpData->CpuData[Index].ApLock);\r
- if (CpuInfoInHob[Index].InitialApicId >= 255 || Index > 254) {\r
- CpuMpData->X2ApicEnable = TRUE;\r
- }\r
CpuMpData->CpuData[Index].CpuHealthy = (CpuInfoInHob[Index].Health == 0)? TRUE:FALSE;\r
CpuMpData->CpuData[Index].ApFunction = 0;\r
CopyMem (&CpuMpData->CpuData[Index].VolatileRegisters, &VolatileRegisters, sizeof (CPU_VOLATILE_REGISTERS));\r
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