/** @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; | |
} |