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/** @file
This library retrieve the EFI_BOOT_SERVICES pointer from EFI system table in
library's constructor.
Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
VOID *gHobList = NULL;
/**
Local implementation of GUID comparasion that doesn't depend on DebugLib::ASSERT().
This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
If there are any bit differences in the two GUIDs, then FALSE is returned.
@param Guid1 A pointer to a 128 bit GUID.
@param Guid2 A pointer to a 128 bit GUID.
@retval TRUE Guid1 and Guid2 are identical.
@retval FALSE Guid1 and Guid2 are not identical.
**/
BOOLEAN
LocalCompareGuid (
IN CONST GUID *Guid1,
IN CONST GUID *Guid2
)
{
UINT64 *Left;
UINT64 *Right;
Left = (UINT64 *)Guid1;
Right = (UINT64 *)Guid2;
return (BOOLEAN)(Left[0] == Right[0] && Left[1] == Right[1]);
}
/**
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
DxeHobListLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
UINTN Index;
for (Index = 0; Index < SystemTable->NumberOfTableEntries; Index++) {
if (LocalCompareGuid (&gEfiHobListGuid, &SystemTable->ConfigurationTable[Index].VendorGuid)) {
gHobList = SystemTable->ConfigurationTable[Index].VendorTable;
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
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