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audk/SecurityPkg/Tcg/TcgSmm/TcgSmm.c

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/** @file
It updates TPM items in ACPI table and registers SMI callback
functions for physical presence and ClearMemory.
Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiDxe.h>
#include <IndustryStandard/Acpi.h>
#include <Guid/PhysicalPresenceData.h>
#include <Guid/MemoryOverwriteControl.h>
#include <Protocol/SmmSwDispatch2.h>
#include <Protocol/AcpiTable.h>
#include <Protocol/SmmVariable.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesLib.h>
//
// AML parsing definitions
//
#define AML_OPREGION_OP 0x80
#define AML_BYTE_PREFIX 0x0A
#define AML_DWORD_PREFIX 0x0C
#pragma pack(1)
typedef struct {
UINT8 SoftwareSmi;
UINT32 Parameter;
UINT32 Response;
UINT32 Request;
UINT32 LastRequest;
UINT32 ReturnCode;
} PHYSICAL_PRESENCE_NVS;
typedef struct {
UINT8 SoftwareSmi;
UINT32 Parameter;
UINT32 Request;
} MEMORY_CLEAR_NVS;
typedef struct {
PHYSICAL_PRESENCE_NVS PhysicalPresence;
MEMORY_CLEAR_NVS MemoryClear;
} TCG_NVS;
typedef struct {
UINT8 OpRegionOp;
UINT32 NameString;
UINT8 RegionSpace;
UINT8 DWordPrefix;
UINT32 RegionOffset;
UINT8 BytePrefix;
UINT8 RegionLen;
} AML_OP_REGION_32_8;
#pragma pack()
EFI_SMM_VARIABLE_PROTOCOL *mSmmVariable;
TCG_NVS *mTcgNvs;
/**
Software SMI callback for TPM physical presence which is called from ACPI method.
@param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
@param[in] Context Points to an optional handler context which was specified when the
handler was registered.
@param[in, out] CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-SMM environment into an SMM environment.
@param[in, out] CommBufferSize The size of the CommBuffer.
@retval EFI_SUCCESS The interrupt was handled successfully.
**/
EFI_STATUS
EFIAPI
PhysicalPresenceCallback (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommBufferSize
)
{
EFI_STATUS Status;
UINTN DataSize;
EFI_PHYSICAL_PRESENCE PpData;
UINT8 Flags;
BOOLEAN RequestConfirmed;
//
// Get the Physical Presence variable
//
DataSize = sizeof (EFI_PHYSICAL_PRESENCE);
Status = mSmmVariable->SmmGetVariable (
PHYSICAL_PRESENCE_VARIABLE,
&gEfiPhysicalPresenceGuid,
NULL,
&DataSize,
&PpData
);
if (EFI_ERROR (Status)) {
return EFI_SUCCESS;
}
DEBUG ((EFI_D_INFO, "[TPM] PP callback, Parameter = %x\n", mTcgNvs->PhysicalPresence.Parameter));
if (mTcgNvs->PhysicalPresence.Parameter == 5) {
//
// Return TPM Operation Response to OS Environment
//
mTcgNvs->PhysicalPresence.LastRequest = PpData.LastPPRequest;
mTcgNvs->PhysicalPresence.Response = PpData.PPResponse;
} else if ((mTcgNvs->PhysicalPresence.Parameter == 2) || (mTcgNvs->PhysicalPresence.Parameter == 7)) {
//
// Submit TPM Operation Request to Pre-OS Environment
//
if (mTcgNvs->PhysicalPresence.Request == PHYSICAL_PRESENCE_SET_OPERATOR_AUTH) {
//
// This command requires UI to prompt user for Auth data, NOT implemented.
//
mTcgNvs->PhysicalPresence.ReturnCode = 1;
return EFI_SUCCESS;
}
if (PpData.PPRequest != mTcgNvs->PhysicalPresence.Request) {
PpData.PPRequest = (UINT8) mTcgNvs->PhysicalPresence.Request;
DataSize = sizeof (EFI_PHYSICAL_PRESENCE);
Status = mSmmVariable->SmmSetVariable (
PHYSICAL_PRESENCE_VARIABLE,
&gEfiPhysicalPresenceGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
DataSize,
&PpData
);
}
if (EFI_ERROR (Status)) {
//
// General failure.
//
mTcgNvs->PhysicalPresence.ReturnCode = 2;
return EFI_SUCCESS;
}
mTcgNvs->PhysicalPresence.ReturnCode = 0;
} else if (mTcgNvs->PhysicalPresence.Parameter == 8) {
//
// Get User Confirmation Status for Operation
//
Flags = PpData.Flags;
RequestConfirmed = FALSE;
switch (mTcgNvs->PhysicalPresence.Request) {
case PHYSICAL_PRESENCE_ENABLE:
case PHYSICAL_PRESENCE_DISABLE:
case PHYSICAL_PRESENCE_ACTIVATE:
case PHYSICAL_PRESENCE_DEACTIVATE:
case PHYSICAL_PRESENCE_ENABLE_ACTIVATE:
case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE:
case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_TRUE:
case PHYSICAL_PRESENCE_SET_OWNER_INSTALL_FALSE:
case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_OWNER_TRUE:
case PHYSICAL_PRESENCE_DEACTIVATE_DISABLE_OWNER_FALSE:
if ((Flags & FLAG_NO_PPI_PROVISION) != 0) {
RequestConfirmed = TRUE;
}
break;
case PHYSICAL_PRESENCE_CLEAR:
case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR:
if ((Flags & FLAG_NO_PPI_CLEAR) != 0) {
RequestConfirmed = TRUE;
}
break;
case PHYSICAL_PRESENCE_DEFERRED_PP_UNOWNERED_FIELD_UPGRADE:
if ((Flags & FLAG_NO_PPI_MAINTENANCE) != 0) {
RequestConfirmed = TRUE;
}
break;
case PHYSICAL_PRESENCE_ENABLE_ACTIVATE_CLEAR_ENABLE_ACTIVATE:
case PHYSICAL_PRESENCE_CLEAR_ENABLE_ACTIVATE:
if ((Flags & FLAG_NO_PPI_CLEAR) != 0 && (Flags & FLAG_NO_PPI_PROVISION) != 0) {
RequestConfirmed = TRUE;
}
break;
case PHYSICAL_PRESENCE_SET_NO_PPI_PROVISION_FALSE:
case PHYSICAL_PRESENCE_SET_NO_PPI_CLEAR_FALSE:
case PHYSICAL_PRESENCE_SET_NO_PPI_MAINTENANCE_FALSE:
case PHYSICAL_PRESENCE_NO_ACTION:
RequestConfirmed = TRUE;
break;
case PHYSICAL_PRESENCE_SET_OPERATOR_AUTH:
//
// This command requires UI to prompt user for Auth data
// Here it is NOT implemented
//
mTcgNvs->PhysicalPresence.ReturnCode = 0;
return EFI_SUCCESS;
}
if (RequestConfirmed) {
//
// Allowed and physically present user not required
//
mTcgNvs->PhysicalPresence.ReturnCode = 4;
} else {
//
// Allowed and physically present user required
//
mTcgNvs->PhysicalPresence.ReturnCode = 3;
}
}
return EFI_SUCCESS;
}
/**
Software SMI callback for MemoryClear which is called from ACPI method.
@param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
@param[in] Context Points to an optional handler context which was specified when the
handler was registered.
@param[in, out] CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-SMM environment into an SMM environment.
@param[in, out] CommBufferSize The size of the CommBuffer.
@retval EFI_SUCCESS The interrupt was handled successfully.
**/
EFI_STATUS
EFIAPI
MemoryClearCallback (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommBufferSize
)
{
EFI_STATUS Status;
UINTN DataSize;
UINT8 MorControl;
if (mTcgNvs->MemoryClear.Parameter == 1) {
//
// Called from ACPI _DSM method, save the MOR data to variable.
//
MorControl = (UINT8) mTcgNvs->MemoryClear.Request;
} else if (mTcgNvs->MemoryClear.Parameter == 2) {
//
// Called from ACPI _PTS method, setup ClearMemory flags if needed.
//
DataSize = sizeof (UINT8);
Status = mSmmVariable->SmmGetVariable (
MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
&gEfiMemoryOverwriteControlDataGuid,
NULL,
&DataSize,
&MorControl
);
if (EFI_ERROR (Status)) {
ASSERT (Status == EFI_NOT_FOUND);
return EFI_SUCCESS;
}
if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {
return EFI_SUCCESS;
}
MorControl &= ~MOR_CLEAR_MEMORY_BIT_MASK;
}
DataSize = sizeof (UINT8);
Status = mSmmVariable->SmmSetVariable (
MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
&gEfiMemoryOverwriteControlDataGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
DataSize,
&MorControl
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
/**
Find the operation region in TCG ACPI table by given Name and Size,
and initialize it if the region is found.
@param[in, out] Table The TPM item in ACPI table.
@param[in] Name The name string to find in TPM table.
@param[in] Size The size of the region to find.
@return The allocated address for the found region.
**/
VOID *
AssignOpRegion (
EFI_ACPI_DESCRIPTION_HEADER *Table,
UINT32 Name,
UINT16 Size
)
{
EFI_STATUS Status;
AML_OP_REGION_32_8 *OpRegion;
EFI_PHYSICAL_ADDRESS MemoryAddress;
MemoryAddress = SIZE_4GB - 1;
//
// Patch some pointers for the ASL code before loading the SSDT.
//
for (OpRegion = (AML_OP_REGION_32_8 *) (Table + 1);
OpRegion <= (AML_OP_REGION_32_8 *) ((UINT8 *) Table + Table->Length);
OpRegion = (AML_OP_REGION_32_8 *) ((UINT8 *) OpRegion + 1)) {
if ((OpRegion->OpRegionOp == AML_OPREGION_OP) &&
(OpRegion->NameString == Name) &&
(OpRegion->RegionLen == Size) &&
(OpRegion->DWordPrefix == AML_DWORD_PREFIX) &&
(OpRegion->BytePrefix == AML_BYTE_PREFIX)) {
Status = gBS->AllocatePages(AllocateMaxAddress, EfiACPIMemoryNVS, EFI_SIZE_TO_PAGES (Size), &MemoryAddress);
ASSERT_EFI_ERROR (Status);
ZeroMem ((VOID *)(UINTN)MemoryAddress, Size);
OpRegion->RegionOffset = (UINT32) (UINTN) MemoryAddress;
break;
}
}
return (VOID *) (UINTN) MemoryAddress;
}
/**
Initialize and publish TPM items in ACPI table.
@retval EFI_SUCCESS The TCG ACPI table is published successfully.
@retval Others The TCG ACPI table is not published.
**/
EFI_STATUS
PublishAcpiTable (
VOID
)
{
EFI_STATUS Status;
EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
UINTN TableKey;
EFI_ACPI_DESCRIPTION_HEADER *Table;
UINTN TableSize;
Status = GetSectionFromFv (
&gEfiCallerIdGuid,
EFI_SECTION_RAW,
0,
(VOID **) &Table,
&TableSize
);
ASSERT_EFI_ERROR (Status);
ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'c', 'g', 'T', 'a', 'b', 'l', 'e'));
mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16) sizeof (TCG_NVS));
ASSERT (mTcgNvs != NULL);
//
// Publish the TPM ACPI table
//
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTable);
ASSERT_EFI_ERROR (Status);
TableKey = 0;
Status = AcpiTable->InstallAcpiTable (
AcpiTable,
Table,
TableSize,
&TableKey
);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
The driver's entry point.
It install callbacks for TPM physical presence and MemoryClear, and locate
SMM variable to be used in the callback function.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval Others Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
InitializeTcgSmm (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_SMM_SW_DISPATCH2_PROTOCOL *SwDispatch;
EFI_SMM_SW_REGISTER_CONTEXT SwContext;
EFI_HANDLE SwHandle;
Status = PublishAcpiTable ();
ASSERT_EFI_ERROR (Status);
//
// Get the Sw dispatch protocol and register SMI callback functions.
//
Status = gSmst->SmmLocateProtocol (&gEfiSmmSwDispatch2ProtocolGuid, NULL, (VOID**)&SwDispatch);
ASSERT_EFI_ERROR (Status);
SwContext.SwSmiInputValue = (UINTN) -1;
Status = SwDispatch->Register (SwDispatch, PhysicalPresenceCallback, &SwContext, &SwHandle);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return Status;
}
mTcgNvs->PhysicalPresence.SoftwareSmi = (UINT8) SwContext.SwSmiInputValue;
SwContext.SwSmiInputValue = (UINTN) -1;
Status = SwDispatch->Register (SwDispatch, MemoryClearCallback, &SwContext, &SwHandle);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return Status;
}
mTcgNvs->MemoryClear.SoftwareSmi = (UINT8) SwContext.SwSmiInputValue;
//
// Locate SmmVariableProtocol.
//
Status = gSmst->SmmLocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID**)&mSmmVariable);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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