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/** @file
AESNI 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"
/**
Prepares for the data used by CPU feature detection and initialization.
@param[in] NumberOfProcessors The number of CPUs in the platform.
@return Pointer to a buffer of CPU related configuration data.
@note This service could be called by BSP only.
**/
VOID *
EFIAPI
AesniGetConfigData (
IN UINTN NumberOfProcessors
)
{
UINT64 *ConfigData;
ConfigData = AllocateZeroPool (sizeof (UINT64) * NumberOfProcessors);
ASSERT (ConfigData != NULL);
return ConfigData;
}
/**
Detects if AESNI 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 AESNI feature is supported.
@retval FALSE AESNI feature is not supported.
@note This service could be called by BSP/APs.
**/
BOOLEAN
EFIAPI
AesniSupport (
IN UINTN ProcessorNumber,
IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
IN VOID *ConfigData OPTIONAL
)
{
MSR_SANDY_BRIDGE_FEATURE_CONFIG_REGISTER *MsrFeatureConfig;
if (IS_SANDY_BRIDGE_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
IS_XEON_5600_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
IS_XEON_E7_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
IS_XEON_PHI_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel)) {
MsrFeatureConfig = (MSR_SANDY_BRIDGE_FEATURE_CONFIG_REGISTER *) ConfigData;
MsrFeatureConfig[ProcessorNumber].Uint64 = AsmReadMsr64 (MSR_SANDY_BRIDGE_FEATURE_CONFIG);
return (CpuInfo->CpuIdVersionInfoEcx.Bits.AESNI == 1);
}
return FALSE;
}
/**
Initializes AESNI 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 AESNI feature must be enabled.
If FALSE, then the AESNI feature must be disabled.
@retval RETURN_SUCCESS AESNI feature is initialized.
@note This service could be called by BSP only.
**/
RETURN_STATUS
EFIAPI
AesniInitialize (
IN UINTN ProcessorNumber,
IN REGISTER_CPU_FEATURE_INFORMATION *CpuInfo,
IN VOID *ConfigData, OPTIONAL
IN BOOLEAN State
)
{
MSR_SANDY_BRIDGE_FEATURE_CONFIG_REGISTER *MsrFeatureConfig;
//
// SANDY_BRIDGE, SILVERMONT, XEON_5600, XEON_7, and XEON_PHI have the same MSR index,
// Simply use MSR_SANDY_BRIDGE_FEATURE_CONFIG here
//
// The scope of the MSR_SANDY_BRIDGE_FEATURE_CONFIG is Core, only program MSR_FEATURE_CONFIG for thread 0
// of each core. Otherwise, once a thread in the core disabled AES, the other thread will cause GP when
// programming it.
//
if (CpuInfo->ProcessorInfo.Location.Thread == 0) {
MsrFeatureConfig = (MSR_SANDY_BRIDGE_FEATURE_CONFIG_REGISTER *) ConfigData;
if ((MsrFeatureConfig[ProcessorNumber].Bits.AESConfiguration & BIT0) == 0) {
CPU_REGISTER_TABLE_WRITE_FIELD (
ProcessorNumber,
Msr,
MSR_SANDY_BRIDGE_FEATURE_CONFIG,
MSR_SANDY_BRIDGE_FEATURE_CONFIG_REGISTER,
Bits.AESConfiguration,
BIT1 | ((State) ? 0 : BIT0)
);
}
}
return RETURN_SUCCESS;
}
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