Eist.c File Reference

#include "CpuCommonFeatures.h"

Go to the source code of this file.

Functions
BOOLEAN EFIAPI	EistSupport (IN UINTN ProcessorNumber, IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, IN VOID *ConfigData OPTIONAL)
RETURN_STATUS EFIAPI	EistInitialize (IN UINTN ProcessorNumber, IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, IN VOID *ConfigData OPTIONAL, IN BOOLEAN State)

Detailed Description

Enhanced Intel SpeedStep feature.

Copyright (c) 2017, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file Eist.c.

Function Documentation

EistInitialize()

RETURN_STATUS EFIAPI EistInitialize	(	IN UINTN	ProcessorNumber,
		IN REGISTER_CPU_FEATURE_INFORMATION *	CpuInfo,
		IN VOID *ConfigData	OPTIONAL,
		IN BOOLEAN	State
	)

Initializes Enhanced Intel SpeedStep feature to specific state.

Parameters

[in]	ProcessorNumber	The index of the CPU executing this function.
[in]	CpuInfo	A pointer to the REGISTER_CPU_FEATURE_INFORMATION structure for the CPU executing this function.
[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().
[in]	State	If TRUE, then the Enhanced Intel SpeedStep feature must be enabled. If FALSE, then the Enhanced Intel SpeedStep feature must be disabled.

Return values

RETURN_SUCCESS

Enhanced Intel SpeedStep feature is initialized.

Note

This service could be called by BSP only.

Definition at line 59 of file Eist.c.

EistSupport()

BOOLEAN EFIAPI EistSupport	(	IN UINTN	ProcessorNumber,
		IN REGISTER_CPU_FEATURE_INFORMATION *	CpuInfo,
		IN VOID *ConfigData	OPTIONAL
	)

Detects if Enhanced Intel SpeedStep feature supported on current processor.

Parameters

[in]	ProcessorNumber	The index of the CPU executing this function.
[in]	CpuInfo	A pointer to the REGISTER_CPU_FEATURE_INFORMATION structure for the CPU executing this function.
[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().

Return values

TRUE	Enhanced Intel SpeedStep feature is supported.
FALSE	Enhanced Intel SpeedStep feature is not supported.

Note

This service could be called by BSP/APs.

Definition at line 29 of file Eist.c.