a855f63e2f
In preparation of providing a standalone MM based variable runtime driver, move the existing SMM driver to the new MM services table, and factor out some pieces that are specific to the traditional driver, mainly related to the use of UEFI boot services, which are not accessible to standalone MM drivers. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Regression-tested-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
137 lines
3.7 KiB
C
137 lines
3.7 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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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 <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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