6661abb695
Current X2APIC is enabled in MpInitLib (used by CpuMpPei and CpuDxe) to follow SDM suggestion. That means we only enable X2APIC if we found there are any initial CPU ID value >= 255. This patch is to provide one chance for platform to enable X2APIC even there is no any initial CPU ID value >= 255. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Eric Dong <eric.dong@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com>
134 lines
4.3 KiB
C
134 lines
4.3 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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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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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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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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