| 1 | /** @file
|
|---|
| 2 | Enhanced Intel SpeedStep feature.
|
|---|
| 3 |
|
|---|
| 4 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
|
|---|
| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent
|
|---|
| 6 |
|
|---|
| 7 | **/
|
|---|
| 8 |
|
|---|
| 9 | #include "CpuCommonFeatures.h"
|
|---|
| 10 |
|
|---|
| 11 | /**
|
|---|
| 12 | Detects if Enhanced Intel SpeedStep feature supported on current processor.
|
|---|
| 13 |
|
|---|
| 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
|
|---|
| 20 | RegisterCpuFeature().
|
|---|
| 21 |
|
|---|
| 22 | @retval TRUE Enhanced Intel SpeedStep feature is supported.
|
|---|
| 23 | @retval FALSE Enhanced Intel SpeedStep feature is not supported.
|
|---|
| 24 |
|
|---|
| 25 | @note This service could be called by BSP/APs.
|
|---|
| 26 | **/
|
|---|
| 27 | BOOLEAN
|
|---|
| 28 | EFIAPI
|
|---|
| 29 | EistSupport (
|
|---|
| 30 | IN UINTN ProcessorNumber,
|
|---|
| 31 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
|
|---|
| 32 | IN VOID *ConfigData OPTIONAL
|
|---|
| 33 | )
|
|---|
| 34 | {
|
|---|
| 35 | return (CpuInfo->CpuIdVersionInfoEcx.Bits.EIST == 1);
|
|---|
| 36 | }
|
|---|
| 37 |
|
|---|
| 38 | /**
|
|---|
| 39 | Initializes Enhanced Intel SpeedStep feature to specific state.
|
|---|
| 40 |
|
|---|
| 41 | @param[in] ProcessorNumber The index of the CPU executing this function.
|
|---|
| 42 | @param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
|
|---|
| 43 | structure for the CPU executing this function.
|
|---|
| 44 | @param[in] ConfigData A pointer to the configuration buffer returned
|
|---|
| 45 | by CPU_FEATURE_GET_CONFIG_DATA. NULL if
|
|---|
| 46 | CPU_FEATURE_GET_CONFIG_DATA was not provided in
|
|---|
| 47 | RegisterCpuFeature().
|
|---|
| 48 | @param[in] State If TRUE, then the Enhanced Intel SpeedStep feature
|
|---|
| 49 | must be enabled.
|
|---|
| 50 | If FALSE, then the Enhanced Intel SpeedStep feature
|
|---|
| 51 | must be disabled.
|
|---|
| 52 |
|
|---|
| 53 | @retval RETURN_SUCCESS Enhanced Intel SpeedStep feature is initialized.
|
|---|
| 54 |
|
|---|
| 55 | @note This service could be called by BSP only.
|
|---|
| 56 | **/
|
|---|
| 57 | RETURN_STATUS
|
|---|
| 58 | EFIAPI
|
|---|
| 59 | EistInitialize (
|
|---|
| 60 | IN UINTN ProcessorNumber,
|
|---|
| 61 | IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
|
|---|
| 62 | IN VOID *ConfigData, OPTIONAL
|
|---|
| 63 | IN BOOLEAN State
|
|---|
| 64 | )
|
|---|
| 65 | {
|
|---|
| 66 | //
|
|---|
| 67 | // The scope of the MSR_IA32_MISC_ENABLE is core for below processor type, only program
|
|---|
| 68 | // MSR_IA32_MISC_ENABLE for thread 0 in each core.
|
|---|
| 69 | //
|
|---|
| 70 | if (IS_ATOM_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
|
|---|
| 71 | IS_CORE_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
|
|---|
| 72 | IS_CORE2_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {
|
|---|
| 73 | if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
|
|---|
| 74 | return RETURN_SUCCESS;
|
|---|
| 75 | }
|
|---|
| 76 | }
|
|---|
| 77 |
|
|---|
| 78 | CPU_REGISTER_TABLE_WRITE_FIELD (
|
|---|
| 79 | ProcessorNumber,
|
|---|
| 80 | Msr,
|
|---|
| 81 | MSR_IA32_MISC_ENABLE,
|
|---|
| 82 | MSR_IA32_MISC_ENABLE_REGISTER,
|
|---|
| 83 | Bits.EIST,
|
|---|
| 84 | (State) ? 1 : 0
|
|---|
| 85 | );
|
|---|
| 86 | return RETURN_SUCCESS;
|
|---|
| 87 | }
|
|---|
