mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-12 14:36:56 +01:00
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
|
/** @file
|
||
|
|
SMM Services Table Library.
|
||
|
|
|
||
|
|
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
#include <PiSmm.h>
|
||
|
|
#include <Protocol/SmmBase2.h>
|
||
|
|
#include <Library/SmmServicesTableLib.h>
|
||
|
|
#include <Library/DebugLib.h>
|
||
|
|
|
||
|
|
EFI_SMM_SYSTEM_TABLE2 *gSmst = NULL;
|
||
|
|
|
||
|
|
/**
|
||
|
|
The constructor function caches the pointer of SMM 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
|
||
|
|
SmmServicesTableLibConstructor (
|
||
|
|
IN EFI_HANDLE ImageHandle,
|
||
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
||
|
|
)
|
||
|
|
{
|
||
|
|
EFI_STATUS Status;
|
||
|
|
EFI_SMM_BASE2_PROTOCOL *InternalSmmBase2;
|
||
|
|
|
||
|
|
InternalSmmBase2 = NULL;
|
||
|
|
//
|
||
|
|
// Retrieve SMM Base2 Protocol, Do not use gBS from UefiBootServicesTableLib on purpose
|
||
|
|
// to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the
|
||
|
|
// SMM driver explicity declares that dependency.
|
||
|
|
//
|
||
|
|
Status = SystemTable->BootServices->LocateProtocol (
|
||
|
|
&gEfiSmmBase2ProtocolGuid,
|
||
|
|
NULL,
|
||
|
|
(VOID **)&InternalSmmBase2
|
||
|
|
);
|
||
|
|
ASSERT_EFI_ERROR (Status);
|
||
|
|
ASSERT (InternalSmmBase2 != NULL);
|
||
|
|
|
||
|
|
//
|
||
|
|
// We are in SMM, retrieve the pointer to SMM System Table
|
||
|
|
//
|
||
|
|
InternalSmmBase2->GetSmstLocation (InternalSmmBase2, &gSmst);
|
||
|
|
ASSERT (gSmst != NULL);
|
||
|
|
|
||
|
|
return EFI_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
This function allows the caller to determine if the driver is executing in
|
||
|
|
System Management Mode(SMM).
|
||
|
|
|
||
|
|
This function returns TRUE if the driver is executing in SMM and FALSE if the
|
||
|
|
driver is not executing in SMM.
|
||
|
|
|
||
|
|
@retval TRUE The driver is executing in System Management Mode (SMM).
|
||
|
|
@retval FALSE The driver is not executing in System Management Mode (SMM).
|
||
|
|
|
||
|
|
**/
|
||
|
|
BOOLEAN
|
||
|
|
EFIAPI
|
||
|
|
InSmm (
|
||
|
|
VOID
|
||
|
|
)
|
||
|
|
{
|
||
|
|
//
|
||
|
|
// We are already in SMM
|
||
|
|
//
|
||
|
|
return TRUE;
|
||
|
|
}
|