diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/C1e.c')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/C1e.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/C1e.c b/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/C1e.c new file mode 100644 index 00000000..5969b2af --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/UefiCpuPkg/Library/CpuCommonFeaturesLib/C1e.c @@ -0,0 +1,81 @@ +/** @file + C1E feature. + + Copyright (c) 2017, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include "CpuCommonFeatures.h" + +/** + Detects if C1E feature supported on current processor. + + @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(). + + @retval TRUE C1E feature is supported. + @retval FALSE C1E feature is not supported. + + @note This service could be called by BSP/APs. +**/ +BOOLEAN +EFIAPI +C1eSupport ( + IN UINTN ProcessorNumber, + IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, + IN VOID *ConfigData OPTIONAL + ) +{ + return IS_NEHALEM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel); +} + +/** + Initializes C1E 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 C1E feature must be enabled. + If FALSE, then the C1E feature must be disabled. + + @retval RETURN_SUCCESS C1E feature is initialized. + + @note This service could be called by BSP only. +**/ +RETURN_STATUS +EFIAPI +C1eInitialize ( + IN UINTN ProcessorNumber, + IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, + IN VOID *ConfigData, OPTIONAL + IN BOOLEAN State + ) +{ + // + // The scope of C1EEnable bit in the MSR_NEHALEM_POWER_CTL is Package, only program + // MSR_FEATURE_CONFIG for thread 0 core 0 in each package. + // + if ((CpuInfo->ProcessorInfo.Location.Thread != 0) || (CpuInfo->ProcessorInfo.Location.Core != 0)) { + return RETURN_SUCCESS; + } + + CPU_REGISTER_TABLE_WRITE_FIELD ( + ProcessorNumber, + Msr, + MSR_NEHALEM_POWER_CTL, + MSR_NEHALEM_POWER_CTL_REGISTER, + Bits.C1EEnable, + (State) ? 1 : 0 + ); + return RETURN_SUCCESS; +} |