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/** @file
CPU Features DXE driver to initialize CPU features.
Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/RegisterCpuFeaturesLib.h>
#include <Library/HobLib.h>
#include <Protocol/SmmConfiguration.h>
#include <Guid/CpuFeaturesInitDone.h>
/**
Worker function to perform CPU feature initialization.
**/
VOID
CpuFeaturesInitializeWorker (
VOID
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
CpuFeaturesDetect ();
CpuFeaturesInitialize ();
//
// Install CPU Features Init Done Protocol
//
Handle = NULL;
Status = gBS->InstallProtocolInterface (
&Handle,
&gEdkiiCpuFeaturesInitDoneGuid,
EFI_NATIVE_INTERFACE,
NULL
);
ASSERT_EFI_ERROR (Status);
}
/**
Event notification that initialize CPU features when gEfiSmmConfigurationProtocol installs.
@param[in] Event The Event that is being processed, not used.
@param[in] Context Event Context, not used.
**/
VOID
EFIAPI
SmmConfigurationEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration;
//
// Make sure this notification is for this handler
//
Status = gBS->LocateProtocol (&gEfiSmmConfigurationProtocolGuid, NULL, (VOID **)&SmmConfiguration);
if (EFI_ERROR (Status)) {
return;
}
CpuFeaturesInitializeWorker ();
}
/**
CPU Features driver entry point function.
If PcdCpuFeaturesInitAfterSmmRelocation is TRUE, it will register one
SMM Configuration Protocol notify function to perform CPU features
initialization. Otherwise, it will perform CPU features initialization
directly.
@param ImageHandle Image handle this driver.
@param SystemTable Pointer to the System Table.
@retval EFI_SUCCESS CPU Features is initialized successfully.
**/
EFI_STATUS
EFIAPI
CpuFeaturesDxeInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
VOID *Registration;
EFI_STATUS Status;
EFI_HANDLE Handle;
if (GetFirstGuidHob (&gEdkiiCpuFeaturesInitDoneGuid) != NULL) {
//
// Try to find HOB first. This HOB exist means CPU features have
// been initialized by CpuFeaturesPei driver, just install
// gEdkiiCpuFeaturesInitDoneGuid.
//
Handle = NULL;
Status = gBS->InstallProtocolInterface (
&Handle,
&gEdkiiCpuFeaturesInitDoneGuid,
EFI_NATIVE_INTERFACE,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
if (PcdGetBool (PcdCpuFeaturesInitAfterSmmRelocation)) {
//
// Install notification callback on SMM Configuration Protocol
//
EfiCreateProtocolNotifyEvent (
&gEfiSmmConfigurationProtocolGuid,
TPL_CALLBACK,
SmmConfigurationEventNotify,
NULL,
&Registration
);
} else {
CpuFeaturesInitializeWorker ();
}
return EFI_SUCCESS;
}
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