/** @file | |
MM Services Table Library. | |
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR> | |
Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <PiMm.h> | |
#include <Protocol/MmBase.h> | |
#include <Library/MmServicesTableLib.h> | |
#include <Library/DebugLib.h> | |
EFI_MM_SYSTEM_TABLE *gMmst = NULL; | |
/** | |
The constructor function caches the pointer of the MM Services Table. | |
@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 | |
MmServicesTableLibConstructor ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_MM_BASE_PROTOCOL *InternalMmBase; | |
InternalMmBase = NULL; | |
// | |
// Retrieve MM Base Protocol, Do not use gBS from UefiBootServicesTableLib on purpose | |
// to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the | |
// MM driver explicity declares that dependency. | |
// | |
Status = SystemTable->BootServices->LocateProtocol ( | |
&gEfiMmBaseProtocolGuid, | |
NULL, | |
(VOID **)&InternalMmBase | |
); | |
ASSERT_EFI_ERROR (Status); | |
ASSERT (InternalMmBase != NULL); | |
// | |
// We are in MM, retrieve the pointer to MM System Table | |
// | |
InternalMmBase->GetMmstLocation (InternalMmBase, &gMmst); | |
ASSERT (gMmst != NULL); | |
return EFI_SUCCESS; | |
} |