0c8b880223
Today's implementation only assumes SandyBridge CPU supports Extended On-Demand Clock Modulation Duty Cycle. Actually it is supported when CPUID.06h.EAX[5] == 1. When platform requests 50% throttling, it causes value 1000b set to the low-4 bits of IA32_CLOCK_MODULATION. But the wrong code sets 1000b to bits[1-3] which causes assertion. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Jeff Fan <vanjeff_919@hotmail.com> Reviewed-by: Eric Dong <eric.dong@intel.com>
101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/** @file
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Clock Modulation feature.
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Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "CpuCommonFeatures.h"
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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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return (CpuInfo->CpuIdVersionInfoEdx.Bits.ACPI == 1);
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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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CPUID_THERMAL_POWER_MANAGEMENT_EAX ThermalPowerManagementEax;
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AsmCpuid (CPUID_THERMAL_POWER_MANAGEMENT, &ThermalPowerManagementEax.Uint32, NULL, NULL, NULL);
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CPU_REGISTER_TABLE_WRITE_FIELD (
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ProcessorNumber,
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Msr,
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MSR_IA32_CLOCK_MODULATION,
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MSR_IA32_CLOCK_MODULATION_REGISTER,
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Bits.OnDemandClockModulationDutyCycle,
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PcdGet8 (PcdCpuClockModulationDutyCycle) >> 1
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);
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if (ThermalPowerManagementEax.Bits.ECMD == 1) {
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CPU_REGISTER_TABLE_WRITE_FIELD (
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ProcessorNumber,
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Msr,
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MSR_IA32_CLOCK_MODULATION,
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MSR_IA32_CLOCK_MODULATION_REGISTER,
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Bits.ExtendedOnDemandClockModulationDutyCycle,
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PcdGet8 (PcdCpuClockModulationDutyCycle) & BIT0
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);
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}
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CPU_REGISTER_TABLE_WRITE_FIELD (
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ProcessorNumber,
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Msr,
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MSR_IA32_CLOCK_MODULATION,
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MSR_IA32_CLOCK_MODULATION_REGISTER,
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Bits.OnDemandClockModulationEnable,
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(State) ? 1 : 0
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);
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return RETURN_SUCCESS;
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}
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