2 Enhanced Intel SpeedStep feature.
4 Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
15 #include "CpuCommonFeatures.h"
18 Detects if Enhanced Intel SpeedStep feature supported on current processor.
20 @param[in] ProcessorNumber The index of the CPU executing this function.
21 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
22 structure for the CPU executing this function.
23 @param[in] ConfigData A pointer to the configuration buffer returned
24 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
25 CPU_FEATURE_GET_CONFIG_DATA was not provided in
28 @retval TRUE Enhanced Intel SpeedStep feature is supported.
29 @retval FALSE Enhanced Intel SpeedStep feature is not supported.
31 @note This service could be called by BSP/APs.
36 IN UINTN ProcessorNumber
,
37 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
38 IN VOID
*ConfigData OPTIONAL
41 return (CpuInfo
->CpuIdVersionInfoEcx
.Bits
.EIST
== 1);
45 Initializes Enhanced Intel SpeedStep feature to specific state.
47 @param[in] ProcessorNumber The index of the CPU executing this function.
48 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
49 structure for the CPU executing this function.
50 @param[in] ConfigData A pointer to the configuration buffer returned
51 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
52 CPU_FEATURE_GET_CONFIG_DATA was not provided in
54 @param[in] State If TRUE, then the Enhanced Intel SpeedStep feature
56 If FALSE, then the Enhanced Intel SpeedStep feature
59 @retval RETURN_SUCCESS Enhanced Intel SpeedStep feature is initialized.
61 @note This service could be called by BSP only.
66 IN UINTN ProcessorNumber
,
67 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
68 IN VOID
*ConfigData
, OPTIONAL
72 CPU_REGISTER_TABLE_WRITE_FIELD (
76 MSR_IA32_MISC_ENABLE_REGISTER
,
80 return RETURN_SUCCESS
;