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UefiCpuPkg/CpuMpPei: Save/Restore CRx/DRx register for APs waking up

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PeiStartupAllAPs()/PeiStartupThisAP() will send INIT-SIPI-SIPI to wakeup APs to
execute AP function. However, some registers will be reset after APs received
INIT IPI. We need to restore some registers (For example, CRx/DRx) manually
after APs wakeup.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@Intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19089 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan 2015-12-02 00:43:45 +00:00 committed by vanjeff
parent 22cfe73a12
commit f40a7de450
1 changed files with 10 additions and 0 deletions
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10
UefiCpuPkg/CpuMpPei/CpuMpPei.c
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@ -259,6 +259,11 @@ ApCFunction (
// Execute AP function if AP is not disabled // Execute AP function if AP is not disabled
// //
GetProcessorNumber (PeiCpuMpData, &ProcessorNumber); GetProcessorNumber (PeiCpuMpData, &ProcessorNumber);
//
// Restore AP's volatile registers saved
//
RestoreVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters, TRUE);
if ((PeiCpuMpData->CpuData[ProcessorNumber].State != CpuStateDisabled) && if ((PeiCpuMpData->CpuData[ProcessorNumber].State != CpuStateDisabled) &&
(PeiCpuMpData->ApFunction != 0)) { (PeiCpuMpData->ApFunction != 0)) {
PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateBusy; PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateBusy;
@ -273,6 +278,11 @@ ApCFunction (
// //
InterlockedIncrement ((UINT32 *)&PeiCpuMpData->FinishedCount); InterlockedIncrement ((UINT32 *)&PeiCpuMpData->FinishedCount);
//
// Save AP volatile registers
//
SaveVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters);
AsmCliHltLoop (); AsmCliHltLoop ();
} }