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80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/** @file
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SMM Services Table Library.
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Copyright (c) 2009 - 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 <PiSmm.h>
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#include <Protocol/SmmBase2.h>
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#include <Library/SmmServicesTableLib.h>
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#include <Library/DebugLib.h>
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EFI_SMM_SYSTEM_TABLE2 *gSmst = NULL;
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/**
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The constructor function caches the pointer of SMM 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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SmmServicesTableLibConstructor (
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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_SMM_BASE2_PROTOCOL *InternalSmmBase2;
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InternalSmmBase2 = NULL;
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//
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// Retrieve SMM Base2 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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// SMM driver explicity declares that dependency.
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//
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Status = SystemTable->BootServices->LocateProtocol (
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&gEfiSmmBase2ProtocolGuid,
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NULL,
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(VOID **)&InternalSmmBase2
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);
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ASSERT_EFI_ERROR (Status);
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ASSERT (InternalSmmBase2 != NULL);
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//
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// We are in SMM, retrieve the pointer to SMM System Table
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//
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InternalSmmBase2->GetSmstLocation (InternalSmmBase2, &gSmst);
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ASSERT (gSmst != NULL);
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return EFI_SUCCESS;
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}
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/**
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This function allows the caller to determine if the driver is executing in
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System Management Mode(SMM).
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This function returns TRUE if the driver is executing in SMM and FALSE if the
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driver is not executing in SMM.
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@retval TRUE The driver is executing in System Management Mode (SMM).
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@retval FALSE The driver is not executing in System Management Mode (SMM).
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**/
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BOOLEAN
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EFIAPI
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InSmm (
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VOID
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)
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{
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//
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// We are already in SMM
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//
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return TRUE;
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}
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