Maintainers.txt: add Laszlo Ersek as UefiCpuPkg reviewer

[mirror_edk2.git] / UefiCpuPkg / CpuFeatures / CpuFeaturesDxe.c

/** @file\r
  CPU Features DXE driver to initialize CPU features.\r
\r
  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <PiDxe.h>\r
\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/UefiLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/RegisterCpuFeaturesLib.h>\r
\r
#include <Protocol/SmmConfiguration.h>\r
#include <Guid/CpuFeaturesInitDone.h>\r
\r
\r
/**\r
  Worker function to perform CPU feature initialization.\r
\r
**/\r
VOID\r
CpuFeaturesInitializeWorker (\r
  VOID\r
  )\r
{\r
  EFI_STATUS             Status;\r
  EFI_HANDLE             Handle;\r
\r
  CpuFeaturesDetect ();\r
\r
  CpuFeaturesInitialize ();\r
\r
  //\r
  // Install CPU Features Init Done Protocol\r
  //\r
  Handle = NULL;\r
  Status = gBS->InstallProtocolInterface (\r
                  &Handle,\r
                  &gEdkiiCpuFeaturesInitDoneGuid,\r
                  EFI_NATIVE_INTERFACE,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r
/**\r
  Event notification that initialize CPU features when gEfiSmmConfigurationProtocol installs.\r
\r
  @param[in]  Event                 The Event that is being processed, not used.\r
  @param[in]  Context               Event Context, not used.\r
**/\r
VOID\r
EFIAPI\r
SmmConfigurationEventNotify (\r
  IN EFI_EVENT                         Event,\r
  IN VOID                              *Context\r
  )\r
{\r
  EFI_STATUS                           Status;\r
  EFI_SMM_CONFIGURATION_PROTOCOL       *SmmConfiguration;\r
\r
  //\r
  // Make sure this notification is for this handler\r
  //\r
  Status = gBS->LocateProtocol (&gEfiSmmConfigurationProtocolGuid, NULL, (VOID **)&SmmConfiguration);\r
  if (EFI_ERROR (Status)) {\r
    return;\r
  }\r
\r
  CpuFeaturesInitializeWorker ();\r
}\r
\r
/**\r
  CPU Features driver entry point function.\r
\r
  If PcdCpuFeaturesInitAfterSmmRelocation is TRUE, it will register one\r
  SMM Configuration Protocol notify function to perform CPU features\r
  initialization. Otherwise, it will perform CPU features initialization\r
  directly.\r
\r
  @param ImageHandle     Image handle this driver.\r
  @param SystemTable     Pointer to the System Table.\r
\r
  @retval EFI_SUCCESS   CPU Features is initialized successfully.\r
**/\r
EFI_STATUS\r
EFIAPI\r
CpuFeaturesDxeInitialize (\r
  IN EFI_HANDLE                            ImageHandle,\r
  IN EFI_SYSTEM_TABLE                      *SystemTable\r
  )\r
{\r
  VOID        *Registration;\r
\r
  if (PcdGetBool (PcdCpuFeaturesInitAfterSmmRelocation)) {\r
    //\r
    // Install notification callback on SMM Configuration Protocol\r
    //\r
    EfiCreateProtocolNotifyEvent (\r
      &gEfiSmmConfigurationProtocolGuid,\r
      TPL_CALLBACK,\r
      SmmConfigurationEventNotify,\r
      NULL,\r
      &Registration\r
      );\r
  } else {\r
    CpuFeaturesInitializeWorker ();\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r