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- /** @file
- Enhanced Intel SpeedStep feature.
- Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "CpuCommonFeatures.h"
- /**
- Detects if Enhanced Intel SpeedStep 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 Enhanced Intel SpeedStep feature is supported.
- @retval FALSE Enhanced Intel SpeedStep feature is not supported.
- @note This service could be called by BSP/APs.
- **/
- BOOLEAN
- EFIAPI
- EistSupport (
- IN UINTN ProcessorNumber,
- IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
- IN VOID *ConfigData OPTIONAL
- )
- {
- return (CpuInfo->CpuIdVersionInfoEcx.Bits.EIST == 1);
- }
- /**
- Initializes Enhanced Intel SpeedStep 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 Enhanced Intel SpeedStep feature
- must be enabled.
- If FALSE, then the Enhanced Intel SpeedStep feature
- must be disabled.
- @retval RETURN_SUCCESS Enhanced Intel SpeedStep feature is initialized.
- @note This service could be called by BSP only.
- **/
- RETURN_STATUS
- EFIAPI
- EistInitialize (
- IN UINTN ProcessorNumber,
- IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
- IN VOID *ConfigData OPTIONAL,
- IN BOOLEAN State
- )
- {
- //
- // The scope of the MSR_IA32_MISC_ENABLE is core for below processor type, only program
- // MSR_IA32_MISC_ENABLE for thread 0 in each core.
- //
- if (IS_ATOM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
- IS_CORE_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
- IS_CORE2_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel))
- {
- if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
- return RETURN_SUCCESS;
- }
- }
- CPU_REGISTER_TABLE_WRITE_FIELD (
- ProcessorNumber,
- Msr,
- MSR_IA32_MISC_ENABLE,
- MSR_IA32_MISC_ENABLE_REGISTER,
- Bits.EIST,
- (State) ? 1 : 0
- );
- return RETURN_SUCCESS;
- }
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