17f5fd9291
The definitions of the rebranded MM protocol stack were chosen such that the existing SMM based core drivers can be reused. So let's implement MmServicesTableLib based on gEfiMmBaseProtocolGuid, which is simply gEfiSmmBase2ProtocolGuid under the hood. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/** @file
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MM Services Table Library.
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Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiMm.h>
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#include <Protocol/MmBase.h>
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#include <Library/MmServicesTableLib.h>
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#include <Library/DebugLib.h>
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EFI_MM_SYSTEM_TABLE *gMmst = NULL;
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/**
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The constructor function caches the pointer of the MM Services Table.
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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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MmServicesTableLibConstructor (
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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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EFI_STATUS Status;
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EFI_MM_BASE_PROTOCOL *InternalMmBase;
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InternalMmBase = NULL;
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//
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// Retrieve MM Base Protocol, Do not use gBS from UefiBootServicesTableLib on purpose
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// to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the
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// MM driver explicity declares that dependency.
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//
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Status = SystemTable->BootServices->LocateProtocol (
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&gEfiMmBaseProtocolGuid,
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NULL,
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(VOID **)&InternalMmBase
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);
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ASSERT_EFI_ERROR (Status);
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ASSERT (InternalMmBase != NULL);
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//
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// We are in MM, retrieve the pointer to MM System Table
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//
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InternalMmBase->GetMmstLocation (InternalMmBase, &gMmst);
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ASSERT (gMmst != NULL);
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return EFI_SUCCESS;
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}
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