BaseTools: Library hashing fix and optimization for --hash feature

[mirror_edk2.git] / OvmfPkg / PlatformPei / FeatureControl.c

/**@file\r
  Install a callback when necessary for setting the Feature Control MSR on all\r
  processors.\r
\r
  Copyright (C) 2016, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
#include <Library/DebugLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <Ppi/MpServices.h>\r
#include <Register/Msr/Core2Msr.h>\r
\r
#include "Platform.h"\r
\r
//\r
// The value to be written to the Feature Control MSR, retrieved from fw_cfg.\r
//\r
STATIC UINT64 mFeatureControlValue;\r
\r
/**\r
  Write the Feature Control MSR on an Application Processor or the Boot\r
  Processor.\r
\r
  All APs execute this function in parallel. The BSP executes the function\r
  separately.\r
\r
  @param[in,out] WorkSpace  Pointer to the input/output argument workspace\r
                            shared by all processors.\r
**/\r
STATIC\r
VOID\r
EFIAPI\r
WriteFeatureControl (\r
  IN OUT VOID *WorkSpace\r
  )\r
{\r
  AsmWriteMsr64 (MSR_CORE2_FEATURE_CONTROL, mFeatureControlValue);\r
}\r
\r
/**\r
  Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.\r
\r
  @param[in] PeiServices      Indirect reference to the PEI Services Table.\r
  @param[in] NotifyDescriptor Address of the notification descriptor data\r
                              structure.\r
  @param[in] Ppi              Address of the PPI that was installed.\r
\r
  @return  Status of the notification. The status code returned from this\r
           function is ignored.\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
OnMpServicesAvailable (\r
  IN EFI_PEI_SERVICES           **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,\r
  IN VOID                       *Ppi\r
  )\r
{\r
  EFI_PEI_MP_SERVICES_PPI *MpServices;\r
  EFI_STATUS              Status;\r
\r
  DEBUG ((EFI_D_VERBOSE, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));\r
\r
  //\r
  // Write the MSR on all the APs in parallel.\r
  //\r
  MpServices = Ppi;\r
  Status = MpServices->StartupAllAPs (\r
                         (CONST EFI_PEI_SERVICES **)PeiServices,\r
                         MpServices,\r
                         WriteFeatureControl, // Procedure\r
                         FALSE,               // SingleThread\r
                         0,                   // TimeoutInMicroSeconds: inf.\r
                         NULL                 // ProcedureArgument\r
                         );\r
  if (EFI_ERROR (Status) && Status != EFI_NOT_STARTED) {\r
    DEBUG ((EFI_D_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));\r
    return Status;\r
  }\r
\r
  //\r
  // Now write the MSR on the BSP too.\r
  //\r
  WriteFeatureControl (NULL);\r
  return EFI_SUCCESS;\r
}\r
\r
//\r
// Notification object for registering the callback, for when\r
// EFI_PEI_MP_SERVICES_PPI becomes available.\r
//\r
STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify = {\r
  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags\r
  EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gEfiPeiMpServicesPpiGuid,               // Guid\r
  OnMpServicesAvailable                    // Notify\r
};\r
\r
VOID\r
InstallFeatureControlCallback (\r
  VOID\r
  )\r
{\r
  EFI_STATUS           Status;\r
  FIRMWARE_CONFIG_ITEM FwCfgItem;\r
  UINTN                FwCfgSize;\r
\r
  Status = QemuFwCfgFindFile ("etc/msr_feature_control", &FwCfgItem,\r
             &FwCfgSize);\r
  if (EFI_ERROR (Status) || FwCfgSize != sizeof mFeatureControlValue) {\r
    //\r
    // Nothing to do.\r
    //\r
    return;\r
  }\r
  QemuFwCfgSelectItem (FwCfgItem);\r
  QemuFwCfgReadBytes (sizeof mFeatureControlValue, &mFeatureControlValue);\r
\r
  Status = PeiServicesNotifyPpi (&mMpServicesNotify);\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_ERROR, "%a: failed to set up MP Services callback: %r\n",\r
      __FUNCTION__, Status));\r
  }\r
}\r