80c4b23638
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
/** @file
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LimitCpuidMaxval Feature.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "CpuCommonFeatures.h"
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/**
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Detects if LimitCpuidMaxval feature supported on current processor.
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@param[in] ProcessorNumber The index of the CPU executing this function.
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@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
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structure for the CPU executing this function.
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@param[in] ConfigData A pointer to the configuration buffer returned
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by CPU_FEATURE_GET_CONFIG_DATA. NULL if
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CPU_FEATURE_GET_CONFIG_DATA was not provided in
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RegisterCpuFeature().
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@retval TRUE LimitCpuidMaxval feature is supported.
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@retval FALSE LimitCpuidMaxval feature is not supported.
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@note This service could be called by BSP/APs.
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**/
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BOOLEAN
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EFIAPI
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LimitCpuidMaxvalSupport (
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IN UINTN ProcessorNumber,
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IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
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IN VOID *ConfigData OPTIONAL
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)
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{
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UINT32 Eax;
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AsmCpuid (CPUID_SIGNATURE, &Eax, NULL, NULL, NULL);
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return (Eax > 3);
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}
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/**
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Initializes LimitCpuidMaxval feature to specific state.
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@param[in] ProcessorNumber The index of the CPU executing this function.
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@param[in] CpuInfo A pointer to the REGISTER_CPU_FEATURE_INFORMATION
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structure for the CPU executing this function.
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@param[in] ConfigData A pointer to the configuration buffer returned
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by CPU_FEATURE_GET_CONFIG_DATA. NULL if
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CPU_FEATURE_GET_CONFIG_DATA was not provided in
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RegisterCpuFeature().
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@param[in] State If TRUE, then the LimitCpuidMaxval feature must be enabled.
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If FALSE, then the LimitCpuidMaxval feature must be disabled.
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@retval RETURN_SUCCESS LimitCpuidMaxval feature is initialized.
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@note This service could be called by BSP only.
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**/
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RETURN_STATUS
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EFIAPI
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LimitCpuidMaxvalInitialize (
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IN UINTN ProcessorNumber,
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IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
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IN VOID *ConfigData, OPTIONAL
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IN BOOLEAN State
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)
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{
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CPU_REGISTER_TABLE_WRITE_FIELD (
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ProcessorNumber,
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Msr,
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MSR_IA32_MISC_ENABLE,
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MSR_IA32_MISC_ENABLE_REGISTER,
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Bits.LimitCpuidMaxval,
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(State) ? 1 : 0
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);
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return RETURN_SUCCESS;
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}
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