diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c b/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c new file mode 100644 index 00000000..e0a17a70 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/FastStrings.c @@ -0,0 +1,58 @@ +/** @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; +} |