X2Apic.c

Go to the documentation of this file.

 
#include "CpuCommonFeatures.h"
 
VOID *
EFIAPI
X2ApicGetConfigData (
  IN UINTN  NumberOfProcessors
  )
{
  BOOLEAN  *ConfigData;
 
  ConfigData = AllocateZeroPool (sizeof (BOOLEAN) * NumberOfProcessors);
  ASSERT (ConfigData != NULL);
  return ConfigData;
}
 
BOOLEAN
EFIAPI
X2ApicSupport (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData  OPTIONAL
  )
{
  BOOLEAN  *X2ApicEnabled;
 
  ASSERT (ConfigData != NULL);
  X2ApicEnabled = (BOOLEAN *)ConfigData;
  //
  // *ConfigData indicates if X2APIC enabled on current processor
  //
  X2ApicEnabled[ProcessorNumber] = (GetApicMode () == LOCAL_APIC_MODE_X2APIC) ? TRUE : FALSE;
 
  return (CpuInfo->CpuIdVersionInfoEcx.Bits.x2APIC == 1);
}
 
RETURN_STATUS
EFIAPI
X2ApicInitialize (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData   OPTIONAL,
  IN BOOLEAN                           State
  )
{
  BOOLEAN  *X2ApicEnabled;
 
  //
  // The scope of the MSR_IA32_APIC_BASE is core for below processor type, only program
  // MSR_IA32_APIC_BASE for thread 0 in each core.
  //
  if (IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {
    if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
      return RETURN_SUCCESS;
    }
  }
 
  ASSERT (ConfigData != NULL);
  X2ApicEnabled = (BOOLEAN *)ConfigData;
  if (X2ApicEnabled[ProcessorNumber]) {
    PRE_SMM_CPU_REGISTER_TABLE_WRITE_FIELD (
      ProcessorNumber,
      Msr,
      MSR_IA32_APIC_BASE,
      MSR_IA32_APIC_BASE_REGISTER,
      Bits.EXTD,
      1
      );
  } else {
    //
    // Enable X2APIC mode only if X2APIC is not enabled,
    // Needn't to disabe X2APIC mode again if X2APIC is not enabled
    //
    if (State) {
      CPU_REGISTER_TABLE_WRITE_FIELD (
        ProcessorNumber,
        Msr,
        MSR_IA32_APIC_BASE,
        MSR_IA32_APIC_BASE_REGISTER,
        Bits.EXTD,
        1
        );
    }
  }
 
  return RETURN_SUCCESS;
}