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/** @file
Copyright (c) 2010, Apple Inc. All rights reserved.<BR>
Copyright (c) 2017 - 2021, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/PayloadEntryHelperLib.h>
/**
Add a new HOB to the HOB List.
@param HobType Type of the new HOB.
@param HobLength Length of the new HOB to allocate.
@return NULL if there is no space to create a hob.
@return The address point to the new created hob.
**/
VOID *
EFIAPI
CreateHob (
IN UINT16 HobType,
IN UINT16 HobLength
)
{
EFI_HOB_HANDOFF_INFO_TABLE *HandOffHob;
EFI_HOB_GENERIC_HEADER *HobEnd;
EFI_PHYSICAL_ADDRESS FreeMemory;
VOID *Hob;
HandOffHob = GetHobList ();
if (HandOffHob == NULL) {
ASSERT (HandOffHob != NULL);
return NULL;
}
//
// Check Length to avoid data overflow.
//
if (HobLength > MAX_UINT16 - 0x7) {
return NULL;
}
HobLength = (UINT16)((HobLength + 0x7) & (~0x7));
FreeMemory = HandOffHob->EfiFreeMemoryTop - HandOffHob->EfiFreeMemoryBottom;
if (FreeMemory < HobLength) {
return NULL;
}
Hob = (VOID *)(UINTN)HandOffHob->EfiEndOfHobList;
((EFI_HOB_GENERIC_HEADER *)Hob)->HobType = HobType;
((EFI_HOB_GENERIC_HEADER *)Hob)->HobLength = HobLength;
((EFI_HOB_GENERIC_HEADER *)Hob)->Reserved = 0;
HobEnd = (EFI_HOB_GENERIC_HEADER *)((UINTN)Hob + HobLength);
HandOffHob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;
HobEnd->HobType = EFI_HOB_TYPE_END_OF_HOB_LIST;
HobEnd->HobLength = sizeof (EFI_HOB_GENERIC_HEADER);
HobEnd->Reserved = 0;
HobEnd++;
HandOffHob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS)(UINTN)HobEnd;
return Hob;
}
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