4 Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
9 #include "CpuCommonFeatures.h"
12 Initializes Fast-Strings feature to specific state.
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
21 @param[in] State If TRUE, then the Fast-Strings feature must be enabled.
22 If FALSE, then the Fast-Strings feature must be disabled.
24 @retval RETURN_SUCCESS Fast-Strings feature is initialized.
26 @note This service could be called by BSP only.
30 FastStringsInitialize (
31 IN UINTN ProcessorNumber
,
32 IN REGISTER_CPU_FEATURE_INFORMATION
*CpuInfo
,
33 IN VOID
*ConfigData
, OPTIONAL
38 // The scope of FastStrings bit in the MSR_IA32_MISC_ENABLE is core for below processor type, only program
39 // MSR_IA32_MISC_ENABLE for thread 0 in each core.
41 if (IS_SILVERMONT_PROCESSOR (CpuInfo
->DisplayFamily
, CpuInfo
->DisplayModel
) ||
42 IS_GOLDMONT_PROCESSOR (CpuInfo
->DisplayFamily
, CpuInfo
->DisplayModel
) ||
43 IS_PENTIUM_4_PROCESSOR (CpuInfo
->DisplayFamily
, CpuInfo
->DisplayModel
)) {
44 if (CpuInfo
->ProcessorInfo
.Location
.Thread
!= 0) {
45 return RETURN_SUCCESS
;
49 CPU_REGISTER_TABLE_WRITE_FIELD (
53 MSR_IA32_MISC_ENABLE_REGISTER
,
57 return RETURN_SUCCESS
;