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/** @file
C1E feature.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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_NEHALEM_POWER_CTL once for each package.
//
if ((CpuInfo->First.Thread == 0) || (CpuInfo->First.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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