ClockModulation.c

Go to the documentation of this file.

 
#include "CpuCommonFeatures.h"
 
typedef struct  {
  CPUID_THERMAL_POWER_MANAGEMENT_EAX    ThermalPowerManagementEax;
  MSR_IA32_CLOCK_MODULATION_REGISTER    ClockModulation;
} CLOCK_MODULATION_CONFIG_DATA;
 
VOID *
EFIAPI
ClockModulationGetConfigData (
  IN UINTN  NumberOfProcessors
  )
{
  UINT32  *ConfigData;
 
  ConfigData = AllocateZeroPool (sizeof (CLOCK_MODULATION_CONFIG_DATA) * NumberOfProcessors);
  ASSERT (ConfigData != NULL);
  return ConfigData;
}
 
BOOLEAN
EFIAPI
ClockModulationSupport (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData  OPTIONAL
  )
{
  CLOCK_MODULATION_CONFIG_DATA  *CmConfigData;
 
  if (CpuInfo->CpuIdVersionInfoEdx.Bits.ACPI == 1) {
    CmConfigData = (CLOCK_MODULATION_CONFIG_DATA *)ConfigData;
    ASSERT (CmConfigData != NULL);
    AsmCpuid (
      CPUID_THERMAL_POWER_MANAGEMENT,
      &CmConfigData[ProcessorNumber].ThermalPowerManagementEax.Uint32,
      NULL,
      NULL,
      NULL
      );
    CmConfigData[ProcessorNumber].ClockModulation.Uint64 = AsmReadMsr64 (MSR_IA32_CLOCK_MODULATION);
    return TRUE;
  }
 
  return FALSE;
}
 
RETURN_STATUS
EFIAPI
ClockModulationInitialize (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData   OPTIONAL,
  IN BOOLEAN                           State
  )
{
  CLOCK_MODULATION_CONFIG_DATA        *CmConfigData;
  MSR_IA32_CLOCK_MODULATION_REGISTER  *ClockModulation;
 
  CmConfigData = (CLOCK_MODULATION_CONFIG_DATA *)ConfigData;
  ASSERT (CmConfigData != NULL);
  ClockModulation = &CmConfigData[ProcessorNumber].ClockModulation;
 
  if (State) {
    ClockModulation->Bits.OnDemandClockModulationEnable    = 1;
    ClockModulation->Bits.OnDemandClockModulationDutyCycle = PcdGet8 (PcdCpuClockModulationDutyCycle) >> 1;
    if (CmConfigData[ProcessorNumber].ThermalPowerManagementEax.Bits.ECMD == 1) {
      ClockModulation->Bits.ExtendedOnDemandClockModulationDutyCycle = PcdGet8 (PcdCpuClockModulationDutyCycle) & BIT0;
    }
  } else {
    ClockModulation->Bits.OnDemandClockModulationEnable = 0;
  }
 
  CPU_REGISTER_TABLE_WRITE64 (
    ProcessorNumber,
    Msr,
    MSR_IA32_CLOCK_MODULATION,
    ClockModulation->Uint64
    );
 
  return RETURN_SUCCESS;
}