/** @file
|
Fast-Strings feature.
|
|
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
#include "CpuCommonFeatures.h"
|
|
/**
|
Initializes Fast-Strings 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 Fast-Strings feature must be enabled.
|
If FALSE, then the Fast-Strings feature must be disabled.
|
|
@retval RETURN_SUCCESS Fast-Strings feature is initialized.
|
|
@note This service could be called by BSP only.
|
**/
|
RETURN_STATUS
|
EFIAPI
|
FastStringsInitialize (
|
IN UINTN ProcessorNumber,
|
IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
|
IN VOID *ConfigData, OPTIONAL
|
IN BOOLEAN State
|
)
|
{
|
//
|
// The scope of FastStrings bit in 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_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
|
IS_GOLDMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
|
IS_PENTIUM_4_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.FastStrings,
|
(State) ? 1 : 0
|
);
|
return RETURN_SUCCESS;
|
}
|
