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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/** @file
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C1E feature.
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Copyright (c) 2017, 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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/**
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Detects if C1E 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 C1E feature is supported.
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@retval FALSE C1E 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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C1eSupport (
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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 IS_NEHALEM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel);
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}
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/**
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Initializes C1E 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 C1E feature must be enabled.
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If FALSE, then the C1E feature must be disabled.
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@retval RETURN_SUCCESS C1E 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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C1eInitialize (
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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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//
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// The scope of C1EEnable bit in the MSR_NEHALEM_POWER_CTL is Package, only program
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// MSR_FEATURE_CONFIG for thread 0 core 0 in each package.
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//
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if ((CpuInfo->ProcessorInfo.Location.Thread != 0) || (CpuInfo->ProcessorInfo.Location.Core != 0)) {
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return RETURN_SUCCESS;
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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_NEHALEM_POWER_CTL,
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MSR_NEHALEM_POWER_CTL_REGISTER,
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Bits.C1EEnable,
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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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