FastStrings.c

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#include "CpuCommonFeatures.h"
 
RETURN_STATUS
EFIAPI
FastStringsInitialize (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData   OPTIONAL,
  IN BOOLEAN                           State
  )
{
  //
  // The scope of FastStrings bit in the MSR_IA32_MISC_ENABLE is core for below processor type, only program
  // MSR_IA32_MISC_ENABLE for thread 0 in each core.
  //
  if (IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
      IS_GOLDMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
      IS_PENTIUM_4_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel))
  {
    if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
      return RETURN_SUCCESS;
    }
  }
 
  CPU_REGISTER_TABLE_WRITE_FIELD (
    ProcessorNumber,
    Msr,
    MSR_IA32_MISC_ENABLE,
    MSR_IA32_MISC_ENABLE_REGISTER,
    Bits.FastStrings,
    (State) ? 1 : 0
    );
  return RETURN_SUCCESS;
}