C1e.c

Go to the documentation of this file.

 
#include "CpuCommonFeatures.h"
 
BOOLEAN
EFIAPI
C1eSupport (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData  OPTIONAL
  )
{
  return IS_NEHALEM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel);
}
 
RETURN_STATUS
EFIAPI
C1eInitialize (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData   OPTIONAL,
  IN BOOLEAN                           State
  )
{
  //
  // The scope of C1EEnable bit in the MSR_NEHALEM_POWER_CTL is Package, only program
  // MSR_NEHALEM_POWER_CTL once for each package.
  //
  if ((CpuInfo->First.Thread == 0) || (CpuInfo->First.Core == 0)) {
    return RETURN_SUCCESS;
  }
 
  CPU_REGISTER_TABLE_WRITE_FIELD (
    ProcessorNumber,
    Msr,
    MSR_NEHALEM_POWER_CTL,
    MSR_NEHALEM_POWER_CTL_REGISTER,
    Bits.C1EEnable,
    (State) ? 1 : 0
    );
  return RETURN_SUCCESS;
}