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131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/** @file
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Parts of the SMM/MM implementation that are specific to traditional MM
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Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved. <BR>
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Copyright (c) 2018, Linaro, Ltd. All rights reserved. <BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/SmmMemLib.h>
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#include "Variable.h"
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/**
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This function checks if the buffer is valid per processor architecture and
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does not overlap with SMRAM.
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@param Buffer The buffer start address to be checked.
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@param Length The buffer length to be checked.
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@retval TRUE This buffer is valid per processor architecture and does not
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overlap with SMRAM.
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@retval FALSE This buffer is not valid per processor architecture or overlaps
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with SMRAM.
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**/
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BOOLEAN
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VariableSmmIsBufferOutsideSmmValid (
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IN EFI_PHYSICAL_ADDRESS Buffer,
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IN UINT64 Length
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)
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{
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return SmmIsBufferOutsideSmmValid (Buffer, Length);
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}
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/**
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Notify the system that the SMM variable driver is ready.
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**/
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VOID
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VariableNotifySmmReady (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_HANDLE Handle;
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Handle = NULL;
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Status = gBS->InstallProtocolInterface (
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&Handle,
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&gEfiSmmVariableProtocolGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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}
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/**
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Notify the system that the SMM variable write driver is ready.
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**/
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VOID
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VariableNotifySmmWriteReady (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_HANDLE Handle;
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Handle = NULL;
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Status = gBS->InstallProtocolInterface (
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&Handle,
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&gSmmVariableWriteGuid,
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EFI_NATIVE_INTERFACE,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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}
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/**
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Variable service MM driver entry point
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@param[in] ImageHandle A handle for the image that is initializing this
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driver
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@param[in] SystemTable A pointer to the EFI system table
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@retval EFI_SUCCESS Variable service successfully initialized.
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**/
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EFI_STATUS
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EFIAPI
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VariableServiceInitialize (
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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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return MmVariableServiceInitialize ();
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}
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/**
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Whether the TCG or TCG2 protocols are installed in the UEFI protocol database.
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This information is used by the MorLock code to infer whether an existing
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MOR variable is legitimate or not.
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@retval TRUE Either the TCG or TCG2 protocol is installed in the UEFI
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protocol database
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@retval FALSE Neither the TCG nor the TCG2 protocol is installed in the UEFI
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protocol database
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**/
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BOOLEAN
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VariableHaveTcgProtocols (
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VOID
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)
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{
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EFI_STATUS Status;
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VOID *Interface;
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Status = gBS->LocateProtocol (
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&gEfiTcg2ProtocolGuid,
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NULL, // Registration
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&Interface
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);
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if (!EFI_ERROR (Status)) {
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return TRUE;
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}
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Status = gBS->LocateProtocol (
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&gEfiTcgProtocolGuid,
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NULL, // Registration
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&Interface
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);
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return !EFI_ERROR (Status);
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}
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