4 Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
9 #include "CpuCommonFeatures.h"
12 Detects if C1E feature supported on current processor.
14 @param[in] ProcessorNumber The index of the CPU executing this function.
15 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
16 structure for the CPU executing this function.
17 @param[in] ConfigData A pointer to the configuration buffer returned
18 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
19 CPU_FEATURE_GET_CONFIG_DATA was not provided in
22 @retval TRUE C1E feature is supported.
23 @retval FALSE C1E feature is not supported.
25 @note This service could be called by BSP/APs.
30 IN UINTN ProcessorNumber
,
31 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
32 IN VOID
*ConfigData OPTIONAL
35 return IS_NEHALEM_PROCESSOR (CpuInfo
->DisplayFamily
, CpuInfo
->DisplayModel
);
39 Initializes C1E feature to specific state.
41 @param[in] ProcessorNumber The index of the CPU executing this function.
42 @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
43 structure for the CPU executing this function.
44 @param[in] ConfigData A pointer to the configuration buffer returned
45 by CPU_FEATURE_GET_CONFIG_DATA. NULL if
46 CPU_FEATURE_GET_CONFIG_DATA was not provided in
48 @param[in] State If TRUE, then the C1E feature must be enabled.
49 If FALSE, then the C1E feature must be disabled.
51 @retval RETURN_SUCCESS C1E feature is initialized.
53 @note This service could be called by BSP only.
58 IN UINTN ProcessorNumber
,
59 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
60 IN VOID
*ConfigData OPTIONAL
,
65 // The scope of C1EEnable bit in the MSR_NEHALEM_POWER_CTL is Package, only program
66 // MSR_NEHALEM_POWER_CTL once for each package.
68 if ((CpuInfo
->First
.Thread
== 0) || (CpuInfo
->First
.Core
== 0)) {
69 return RETURN_SUCCESS
;
72 CPU_REGISTER_TABLE_WRITE_FIELD (
75 MSR_NEHALEM_POWER_CTL
,
76 MSR_NEHALEM_POWER_CTL_REGISTER
,
80 return RETURN_SUCCESS
;