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/** @file
C1E feature.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "CpuCommonFeatures.h"
/**
Detects if C1E feature supported on current processor.
@param[in] ProcessorNumber The index of the CPU executing this function.
@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
structure for the CPU executing this function.
@param[in] ConfigData A pointer to the configuration buffer returned
by CPU_FEATURE_GET_CONFIG_DATA. NULL if
CPU_FEATURE_GET_CONFIG_DATA was not provided in
RegisterCpuFeature().
@retval TRUE C1E feature is supported.
@retval FALSE C1E feature is not supported.
@note This service could be called by BSP/APs.
**/
BOOLEAN
EFIAPI
C1eSupport (
IN UINTN ProcessorNumber,
IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
IN VOID *ConfigData OPTIONAL
)
{
return IS_NEHALEM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel);
}
/**
Initializes C1E feature to specific state.
@param[in] ProcessorNumber The index of the CPU executing this function.
@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
structure for the CPU executing this function.
@param[in] ConfigData A pointer to the configuration buffer returned
by CPU_FEATURE_GET_CONFIG_DATA. NULL if
CPU_FEATURE_GET_CONFIG_DATA was not provided in
RegisterCpuFeature().
@param[in] State If TRUE, then the C1E feature must be enabled.
If FALSE, then the C1E feature must be disabled.
@retval RETURN_SUCCESS C1E feature is initialized.
@note This service could be called by BSP only.
**/
RETURN_STATUS
EFIAPI
C1eInitialize (
IN UINTN ProcessorNumber,
IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
IN VOID *ConfigData, OPTIONAL
IN BOOLEAN State
)
{
//
// The scope of C1EEnable bit in the MSR_NEHALEM_POWER_CTL is Package, only program
// MSR_FEATURE_CONFIG for thread 0 core 0 in each package.
//
if ((CpuInfo->ProcessorInfo.Location.Thread != 0) || (CpuInfo->ProcessorInfo.Location.Core != 0)) {
return RETURN_SUCCESS;
}
CPU_REGISTER_TABLE_WRITE_FIELD (
ProcessorNumber,
Msr,
MSR_NEHALEM_POWER_CTL,
MSR_NEHALEM_POWER_CTL_REGISTER,
Bits.C1EEnable,
(State) ? 1 : 0
);
return RETURN_SUCCESS;
}
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