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https://github.com/CloverHackyColor/CloverBootloader.git
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132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
/** @file
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Clock Modulation feature.
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Copyright (c) 2017 - 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "CpuCommonFeatures.h"
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typedef struct {
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CPUID_THERMAL_POWER_MANAGEMENT_EAX ThermalPowerManagementEax;
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MSR_IA32_CLOCK_MODULATION_REGISTER ClockModulation;
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} CLOCK_MODULATION_CONFIG_DATA;
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/**
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Prepares for the data used by CPU feature detection and initialization.
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@param[in] NumberOfProcessors The number of CPUs in the platform.
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@return Pointer to a buffer of CPU related configuration data.
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@note This service could be called by BSP only.
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**/
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VOID *
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EFIAPI
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ClockModulationGetConfigData (
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IN UINTN NumberOfProcessors
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)
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{
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UINT32 *ConfigData;
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ConfigData = AllocateZeroPool (sizeof (CLOCK_MODULATION_CONFIG_DATA) * NumberOfProcessors);
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ASSERT (ConfigData != NULL);
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return ConfigData;
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}
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/**
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Detects if Clock Modulation feature supported on current processor.
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@param[in] ProcessorNumber The index of the CPU executing this function.
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@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
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structure for the CPU executing this function.
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@param[in] ConfigData A pointer to the configuration buffer returned
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by CPU_FEATURE_GET_CONFIG_DATA. NULL if
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CPU_FEATURE_GET_CONFIG_DATA was not provided in
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RegisterCpuFeature().
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@retval TRUE Clock Modulation feature is supported.
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@retval FALSE Clock Modulation feature is not supported.
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@note This service could be called by BSP/APs.
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**/
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BOOLEAN
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EFIAPI
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ClockModulationSupport (
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IN UINTN ProcessorNumber,
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IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
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IN VOID *ConfigData OPTIONAL
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)
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{
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CLOCK_MODULATION_CONFIG_DATA *CmConfigData;
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if (CpuInfo->CpuIdVersionInfoEdx.Bits.ACPI == 1) {
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CmConfigData = (CLOCK_MODULATION_CONFIG_DATA *) ConfigData;
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ASSERT (CmConfigData != NULL);
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AsmCpuid (
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CPUID_THERMAL_POWER_MANAGEMENT,
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&CmConfigData[ProcessorNumber].ThermalPowerManagementEax.Uint32,
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NULL,
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NULL,
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NULL
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);
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CmConfigData[ProcessorNumber].ClockModulation.Uint64 = AsmReadMsr64 (MSR_IA32_CLOCK_MODULATION);
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return TRUE;
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}
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return FALSE;
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}
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/**
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Initializes Clock Modulation feature to specific state.
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@param[in] ProcessorNumber The index of the CPU executing this function.
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@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
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structure for the CPU executing this function.
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@param[in] ConfigData A pointer to the configuration buffer returned
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by CPU_FEATURE_GET_CONFIG_DATA. NULL if
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CPU_FEATURE_GET_CONFIG_DATA was not provided in
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RegisterCpuFeature().
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@param[in] State If TRUE, then the Clock Modulation feature must be enabled.
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If FALSE, then the Clock Modulation feature must be disabled.
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@retval RETURN_SUCCESS Clock Modulation feature is initialized.
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@note This service could be called by BSP only.
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**/
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RETURN_STATUS
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EFIAPI
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ClockModulationInitialize (
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IN UINTN ProcessorNumber,
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IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
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IN VOID *ConfigData, OPTIONAL
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IN BOOLEAN State
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)
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{
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CLOCK_MODULATION_CONFIG_DATA *CmConfigData;
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MSR_IA32_CLOCK_MODULATION_REGISTER *ClockModulation;
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CmConfigData = (CLOCK_MODULATION_CONFIG_DATA *) ConfigData;
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ASSERT (CmConfigData != NULL);
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ClockModulation = &CmConfigData[ProcessorNumber].ClockModulation;
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if (State) {
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ClockModulation->Bits.OnDemandClockModulationEnable = 1;
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ClockModulation->Bits.OnDemandClockModulationDutyCycle = PcdGet8 (PcdCpuClockModulationDutyCycle) >> 1;
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if (CmConfigData[ProcessorNumber].ThermalPowerManagementEax.Bits.ECMD == 1) {
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ClockModulation->Bits.ExtendedOnDemandClockModulationDutyCycle = PcdGet8 (PcdCpuClockModulationDutyCycle) & BIT0;
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}
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} else {
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ClockModulation->Bits.OnDemandClockModulationEnable = 0;
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}
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CPU_REGISTER_TABLE_WRITE64 (
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ProcessorNumber,
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Msr,
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MSR_IA32_CLOCK_MODULATION,
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ClockModulation->Uint64
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);
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return RETURN_SUCCESS;
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}
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