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author | Jeff Fan <jeff.fan@intel.com> | 2017-03-07 16:56:15 +0800 |
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committer | Jeff Fan <jeff.fan@intel.com> | 2017-03-22 10:11:58 +0800 |
commit | 0a70d1c3042956c418c89a703d40d3262e4d6c87 (patch) | |
tree | 65c3a9071bf047973660facf1cc7571becb83dce /UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c | |
parent | eff78ac35b315cfdf09e0413df4bbc27368af2aa (diff) | |
download | edk2-0a70d1c3042956c418c89a703d40d3262e4d6c87.tar.gz edk2-0a70d1c3042956c418c89a703d40d3262e4d6c87.tar.bz2 edk2-0a70d1c3042956c418c89a703d40d3262e4d6c87.zip |
UefiCpuPkg: Add NULL CPU Common Features Library instance
This NULL CPU common Features Library instance will register some CPU features
defined in Intel(R) 64 and IA-32 Architectures Software Developer's Manual,
Volume 3, September 2016, Chapter 35 Model-Specific-Registers (MSR).
Add PCD PcdCpuClockModulationDutyCycle and PcdIsPowerOnReset consumed by NULL
CPU Common Features Library instance.
v2:
1. Using MSR_IA32_EFER to enable/disable NX feature instead of using
MSR_IA32_MISC_ENABLE.
2. Fix bug that SMX and VMX feature is swapped.
v3:
1. Add AesniGetConfigData() to get current register state.
v5:
Move MSR reading from AesniGetConfigData() to AesniSupport().
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Diffstat (limited to 'UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c')
-rw-r--r-- | UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c b/UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c new file mode 100644 index 0000000000..e1d3d42d99 --- /dev/null +++ b/UefiCpuPkg/Library/CpuCommonFeaturesLib/Eist.c @@ -0,0 +1,81 @@ +/** @file + Enhanced Intel SpeedStep feature. + + Copyright (c) 2017, Intel Corporation. All rights reserved.<BR> + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#include "CpuCommonFeatures.h" + +/** + Detects if Enhanced Intel SpeedStep 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 Enhanced Intel SpeedStep feature is supported. + @retval FALSE Enhanced Intel SpeedStep feature is not supported. + + @note This service could be called by BSP/APs. +**/ +BOOLEAN +EFIAPI +EistSupport ( + IN UINTN ProcessorNumber, + IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, + IN VOID *ConfigData OPTIONAL + ) +{ + return (CpuInfo->CpuIdVersionInfoEcx.Bits.EIST == 1); +} + +/** + Initializes Enhanced Intel SpeedStep 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 Enhanced Intel SpeedStep feature + must be enabled. + If FALSE, then the Enhanced Intel SpeedStep feature + must be disabled. + + @retval RETURN_SUCCESS Enhanced Intel SpeedStep feature is initialized. + + @note This service could be called by BSP only. +**/ +RETURN_STATUS +EFIAPI +EistInitialize ( + IN UINTN ProcessorNumber, + IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo, + IN VOID *ConfigData, OPTIONAL + IN BOOLEAN State + ) +{ + CPU_REGISTER_TABLE_WRITE_FIELD ( + ProcessorNumber, + Msr, + MSR_IA32_MISC_ENABLE, + MSR_IA32_MISC_ENABLE_REGISTER, + Bits.EIST, + (State) ? 1 : 0 + ); + return RETURN_SUCCESS; +} |