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https://github.com/CloverHackyColor/CloverBootloader.git
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61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/** @file
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This library retrieve the EFI_BOOT_SERVICES pointer from EFI system table in
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library's constructor.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/DebugLib.h>
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EFI_HANDLE gImageHandle = NULL;
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EFI_SYSTEM_TABLE *gST = NULL;
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EFI_BOOT_SERVICES *gBS = NULL;
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/**
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The constructor function caches the pointer of Boot Services Table.
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The constructor function caches the pointer of Boot Services Table through System Table.
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It will ASSERT() if the pointer of System Table is NULL.
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It will ASSERT() if the pointer of Boot Services Table is NULL.
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It will always return EFI_SUCCESS.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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UefiBootServicesTableLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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//
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// Cache the Image Handle
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//
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gImageHandle = ImageHandle;
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ASSERT (gImageHandle != NULL);
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//
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// Cache pointer to the EFI System Table
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//
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gST = SystemTable;
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ASSERT (gST != NULL);
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//
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// Cache pointer to the EFI Boot Services Table
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//
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gBS = SystemTable->BootServices;
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ASSERT (gBS != NULL);
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return EFI_SUCCESS;
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}
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