system76-edk2/MdeModulePkg/Core/Pei/Hob/Hob.c

/** @file
  This module provide Hand-Off Block manipulation.

Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "PeiMain.h"

/**

  Gets the pointer to the HOB List.

  @param PeiServices                   An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param HobList                       Pointer to the HOB List.

  @retval EFI_SUCCESS                  Get the pointer of HOB List
  @retval EFI_NOT_AVAILABLE_YET        the HOB List is not yet published
  @retval EFI_INVALID_PARAMETER        HobList is NULL (in debug mode)

**/
EFI_STATUS
EFIAPI
PeiGetHobList (
  IN CONST EFI_PEI_SERVICES  **PeiServices,
  IN OUT VOID                **HobList
  )
{
  PEI_CORE_INSTANCE  *PrivateData;

  //
  // Only check this parameter in debug mode
  //

  DEBUG_CODE_BEGIN ();
  if (HobList == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  DEBUG_CODE_END ();

  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS (PeiServices);

  *HobList = PrivateData->HobList.Raw;

  return EFI_SUCCESS;
}

/**
  Add a new HOB to the HOB List.

  @param PeiServices      An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param Type             Type of the new HOB.
  @param Length           Length of the new HOB to allocate.
  @param Hob              Pointer to the new HOB.

  @return  EFI_SUCCESS           Success to create HOB.
  @retval  EFI_INVALID_PARAMETER if Hob is NULL
  @retval  EFI_NOT_AVAILABLE_YET if HobList is still not available.
  @retval  EFI_OUT_OF_RESOURCES  if there is no more memory to grow the Hoblist.

**/
EFI_STATUS
EFIAPI
PeiCreateHob (
  IN CONST EFI_PEI_SERVICES  **PeiServices,
  IN UINT16                  Type,
  IN UINT16                  Length,
  IN OUT VOID                **Hob
  )
{
  EFI_STATUS                  Status;
  EFI_HOB_HANDOFF_INFO_TABLE  *HandOffHob;
  EFI_HOB_GENERIC_HEADER      *HobEnd;
  EFI_PHYSICAL_ADDRESS        FreeMemory;

  Status = PeiGetHobList (PeiServices, Hob);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  HandOffHob = *Hob;

  //
  // Check Length to avoid data overflow.
  //
  if (0x10000 - Length <= 0x7) {
    return EFI_INVALID_PARAMETER;
  }

  Length = (UINT16)((Length + 0x7) & (~0x7));

  FreeMemory = HandOffHob->EfiFreeMemoryTop -
               HandOffHob->EfiFreeMemoryBottom;

  if (FreeMemory < Length) {
    DEBUG ((DEBUG_ERROR, "PeiCreateHob fail: Length - 0x%08x\n", (UINTN)Length));
    DEBUG ((DEBUG_ERROR, "  FreeMemoryTop    - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryTop));
    DEBUG ((DEBUG_ERROR, "  FreeMemoryBottom - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryBottom));
    return EFI_OUT_OF_RESOURCES;
  }

  *Hob                                        = (VOID *)(UINTN)HandOffHob->EfiEndOfHobList;
  ((EFI_HOB_GENERIC_HEADER *)*Hob)->HobType   = Type;
  ((EFI_HOB_GENERIC_HEADER *)*Hob)->HobLength = Length;
  ((EFI_HOB_GENERIC_HEADER *)*Hob)->Reserved  = 0;

  HobEnd                      = (EFI_HOB_GENERIC_HEADER *)((UINTN)*Hob + Length);
  HandOffHob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;

  HobEnd->HobType   = EFI_HOB_TYPE_END_OF_HOB_LIST;
  HobEnd->HobLength = (UINT16)sizeof (EFI_HOB_GENERIC_HEADER);
  HobEnd->Reserved  = 0;
  HobEnd++;
  HandOffHob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;

  return EFI_SUCCESS;
}

/**
  Install SEC HOB data to the HOB List.

  @param PeiServices    An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param SecHobList     Pointer to SEC HOB List.

  @return EFI_SUCCESS           Success to install SEC HOB data.
  @retval EFI_OUT_OF_RESOURCES  If there is no more memory to grow the Hoblist.

**/
EFI_STATUS
PeiInstallSecHobData (
  IN CONST EFI_PEI_SERVICES  **PeiServices,
  IN EFI_HOB_GENERIC_HEADER  *SecHobList
  )
{
  EFI_STATUS                  Status;
  EFI_HOB_HANDOFF_INFO_TABLE  *HandOffHob;
  EFI_PEI_HOB_POINTERS        HobStart;
  EFI_PEI_HOB_POINTERS        Hob;
  UINTN                       SecHobListLength;
  EFI_PHYSICAL_ADDRESS        FreeMemory;
  EFI_HOB_GENERIC_HEADER      *HobEnd;

  HandOffHob = NULL;
  Status     = PeiGetHobList (PeiServices, (VOID **)&HandOffHob);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  ASSERT (HandOffHob != NULL);

  HobStart.Raw = (UINT8 *)SecHobList;
  //
  // The HobList must not contain a EFI_HOB_HANDOFF_INFO_TABLE HOB (PHIT) HOB.
  //
  ASSERT (HobStart.Header->HobType != EFI_HOB_TYPE_HANDOFF);
  //
  // Calculate the SEC HOB List length,
  // not including the terminated HOB(EFI_HOB_TYPE_END_OF_HOB_LIST).
  //
  for (Hob.Raw = HobStart.Raw; !END_OF_HOB_LIST (Hob); Hob.Raw = GET_NEXT_HOB (Hob)) {
  }

  SecHobListLength = (UINTN)Hob.Raw - (UINTN)HobStart.Raw;
  //
  // The length must be 8-bytes aligned.
  //
  ASSERT ((SecHobListLength & 0x7) == 0);

  FreeMemory = HandOffHob->EfiFreeMemoryTop -
               HandOffHob->EfiFreeMemoryBottom;

  if (FreeMemory < SecHobListLength) {
    DEBUG ((DEBUG_ERROR, "PeiInstallSecHobData fail: SecHobListLength - 0x%08x\n", SecHobListLength));
    DEBUG ((DEBUG_ERROR, "  FreeMemoryTop    - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryTop));
    DEBUG ((DEBUG_ERROR, "  FreeMemoryBottom - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryBottom));
    return EFI_OUT_OF_RESOURCES;
  }

  Hob.Raw = (UINT8 *)(UINTN)HandOffHob->EfiEndOfHobList;
  CopyMem (Hob.Raw, HobStart.Raw, SecHobListLength);

  HobEnd                      = (EFI_HOB_GENERIC_HEADER *)((UINTN)Hob.Raw + SecHobListLength);
  HandOffHob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;

  HobEnd->HobType   = EFI_HOB_TYPE_END_OF_HOB_LIST;
  HobEnd->HobLength = (UINT16)sizeof (EFI_HOB_GENERIC_HEADER);
  HobEnd->Reserved  = 0;
  HobEnd++;
  HandOffHob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;

  return EFI_SUCCESS;
}

/**

  Builds a Handoff Information Table HOB

  @param BootMode        - Current Bootmode
  @param MemoryBegin     - Start Memory Address.
  @param MemoryLength    - Length of Memory.

  @return EFI_SUCCESS Always success to initialize HOB.

**/
EFI_STATUS
PeiCoreBuildHobHandoffInfoTable (
  IN EFI_BOOT_MODE         BootMode,
  IN EFI_PHYSICAL_ADDRESS  MemoryBegin,
  IN UINT64                MemoryLength
  )
{
  EFI_HOB_HANDOFF_INFO_TABLE  *Hob;
  EFI_HOB_GENERIC_HEADER      *HobEnd;

  Hob                   = (VOID *)(UINTN)MemoryBegin;
  HobEnd                = (EFI_HOB_GENERIC_HEADER *)(Hob+1);
  Hob->Header.HobType   = EFI_HOB_TYPE_HANDOFF;
  Hob->Header.HobLength = (UINT16)sizeof (EFI_HOB_HANDOFF_INFO_TABLE);
  Hob->Header.Reserved  = 0;

  HobEnd->HobType   = EFI_HOB_TYPE_END_OF_HOB_LIST;
  HobEnd->HobLength = (UINT16)sizeof (EFI_HOB_GENERIC_HEADER);
  HobEnd->Reserved  = 0;

  Hob->Version  = EFI_HOB_HANDOFF_TABLE_VERSION;
  Hob->BootMode = BootMode;

  Hob->EfiMemoryTop        = MemoryBegin + MemoryLength;
  Hob->EfiMemoryBottom     = MemoryBegin;
  Hob->EfiFreeMemoryTop    = MemoryBegin + MemoryLength;
  Hob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS)(UINTN)(HobEnd + 1);
  Hob->EfiEndOfHobList     = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;

  return EFI_SUCCESS;
}