mirror of https://github.com/acidanthera/audk.git
139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/** @file
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X2Apic feature.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "CpuCommonFeatures.h"
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/**
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Prepares for the data used by CPU feature detection and initialization.
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@param[in] NumberOfProcessors The number of CPUs in the platform.
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@return Pointer to a buffer of CPU related configuration data.
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@note This service could be called by BSP only.
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**/
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VOID *
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EFIAPI
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X2ApicGetConfigData (
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IN UINTN NumberOfProcessors
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)
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{
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BOOLEAN *ConfigData;
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ConfigData = AllocateZeroPool (sizeof (BOOLEAN) * NumberOfProcessors);
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ASSERT (ConfigData != NULL);
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return ConfigData;
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}
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/**
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Detects if X2Apci feature supported on current processor.
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Detect if X2Apci has been already enabled.
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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 X2Apci feature is supported.
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@retval FALSE X2Apci 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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X2ApicSupport (
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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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BOOLEAN *X2ApicEnabled;
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ASSERT (ConfigData != NULL);
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X2ApicEnabled = (BOOLEAN *)ConfigData;
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//
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// *ConfigData indicates if X2APIC enabled on current processor
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//
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X2ApicEnabled[ProcessorNumber] = (GetApicMode () == LOCAL_APIC_MODE_X2APIC) ? TRUE : FALSE;
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return (CpuInfo->CpuIdVersionInfoEcx.Bits.x2APIC == 1);
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}
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/**
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Initializes X2Apci 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 X2Apci feature must be enabled.
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If FALSE, then the X2Apci feature must be disabled.
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@retval RETURN_SUCCESS X2Apci 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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X2ApicInitialize (
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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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BOOLEAN *X2ApicEnabled;
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//
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// The scope of the MSR_IA32_APIC_BASE is core for below processor type, only program
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// MSR_IA32_APIC_BASE for thread 0 in each core.
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//
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if (IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {
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if (CpuInfo->ProcessorInfo.Location.Thread != 0) {
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return RETURN_SUCCESS;
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}
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}
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ASSERT (ConfigData != NULL);
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X2ApicEnabled = (BOOLEAN *)ConfigData;
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if (X2ApicEnabled[ProcessorNumber]) {
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PRE_SMM_CPU_REGISTER_TABLE_WRITE_FIELD (
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ProcessorNumber,
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Msr,
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MSR_IA32_APIC_BASE,
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MSR_IA32_APIC_BASE_REGISTER,
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Bits.EXTD,
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1
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);
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} else {
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//
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// Enable X2APIC mode only if X2APIC is not enabled,
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// Needn't to disabe X2APIC mode again if X2APIC is not enabled
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//
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if (State) {
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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_APIC_BASE,
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MSR_IA32_APIC_BASE_REGISTER,
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Bits.EXTD,
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1
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);
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}
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}
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return RETURN_SUCCESS;
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}
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