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/** @file
The module entry point for Tcg2 configuration module.
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Guid/TpmInstance.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/PcdLib.h>
#include <Ppi/ReadOnlyVariable2.h>
#include <Ppi/TpmInitialized.h>
#include <Protocol/Tcg2Protocol.h>
#include "Tcg2ConfigNvData.h"
#include "Tcg2Internal.h"
TPM_INSTANCE_ID mTpmInstanceId[] = TPM_INSTANCE_ID_LIST;
CONST EFI_PEI_PPI_DESCRIPTOR gTpmSelectedPpi = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiTpmDeviceSelectedGuid,
NULL
};
EFI_PEI_PPI_DESCRIPTOR mTpmInitializationDonePpiList = {
EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
&gPeiTpmInitializationDonePpiGuid,
NULL
};
/**
This routine check both SetupVariable and real TPM device, and return final TpmDevice configuration.
@param SetupTpmDevice TpmDevice configuration in setup driver
@return TpmDevice configuration
**/
UINT8
DetectTpmDevice (
IN UINT8 SetupTpmDevice
);
/**
The entry point for Tcg2 configuration driver.
@param FileHandle Handle of the file being invoked.
@param PeiServices Describes the list of possible PEI Services.
@retval EFI_SUCCESS Convert variable to PCD successfully.
@retval Others Fail to convert variable to PCD.
**/
EFI_STATUS
EFIAPI
Tcg2ConfigPeimEntryPoint (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
UINTN Size;
EFI_STATUS Status;
EFI_STATUS Status2;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *VariablePpi;
TCG2_CONFIGURATION Tcg2Configuration;
UINTN Index;
UINT8 TpmDevice;
Status = PeiServicesLocatePpi (&gEfiPeiReadOnlyVariable2PpiGuid, 0, NULL, (VOID **) &VariablePpi);
ASSERT_EFI_ERROR (Status);
Size = sizeof(Tcg2Configuration);
Status = VariablePpi->GetVariable (
VariablePpi,
TCG2_STORAGE_NAME,
&gTcg2ConfigFormSetGuid,
NULL,
&Size,
&Tcg2Configuration
);
if (EFI_ERROR (Status)) {
//
// Variable not ready, set default value
//
Tcg2Configuration.TpmDevice = TPM_DEVICE_DEFAULT;
}
//
// Validation
//
if ((Tcg2Configuration.TpmDevice > TPM_DEVICE_MAX) || (Tcg2Configuration.TpmDevice < TPM_DEVICE_MIN)) {
Tcg2Configuration.TpmDevice = TPM_DEVICE_DEFAULT;
}
//
// Although we have SetupVariable info, we still need detect TPM device manually.
//
DEBUG ((DEBUG_INFO, "Tcg2Configuration.TpmDevice from Setup: %x\n", Tcg2Configuration.TpmDevice));
if (PcdGetBool (PcdTpmAutoDetection)) {
TpmDevice = DetectTpmDevice (Tcg2Configuration.TpmDevice);
DEBUG ((DEBUG_INFO, "TpmDevice final: %x\n", TpmDevice));
if (TpmDevice != TPM_DEVICE_NULL) {
Tcg2Configuration.TpmDevice = TpmDevice;
}
} else {
TpmDevice = Tcg2Configuration.TpmDevice;
}
//
// Convert variable to PCD.
// This is work-around because there is no guarantee DynamicHiiPcd can return correct value in DXE phase.
// Using DynamicPcd instead.
//
// NOTE: Tcg2Configuration variable contains the desired TpmDevice type,
// while PcdTpmInstanceGuid PCD contains the real detected TpmDevice type
//
for (Index = 0; Index < sizeof(mTpmInstanceId)/sizeof(mTpmInstanceId[0]); Index++) {
if (TpmDevice == mTpmInstanceId[Index].TpmDevice) {
Size = sizeof(mTpmInstanceId[Index].TpmInstanceGuid);
Status = PcdSetPtrS (PcdTpmInstanceGuid, &Size, &mTpmInstanceId[Index].TpmInstanceGuid);
ASSERT_EFI_ERROR (Status);
DEBUG ((DEBUG_INFO, "TpmDevice PCD: %g\n", &mTpmInstanceId[Index].TpmInstanceGuid));
break;
}
}
//
// Selection done
//
Status = PeiServicesInstallPpi (&gTpmSelectedPpi);
ASSERT_EFI_ERROR (Status);
//
// Even if no TPM is selected or detected, we still need install TpmInitializationDonePpi.
// Because TcgPei or Tcg2Pei will not run, but we still need a way to notify other driver.
// Other driver can know TPM initialization state by TpmInitializedPpi.
//
if (CompareGuid (PcdGetPtr(PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceNoneGuid)) {
Status2 = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);
ASSERT_EFI_ERROR (Status2);
}
return Status;
}
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