Tpm2DeviceLibTcg2.c

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#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Protocol/Tcg2Protocol.h>
#include <IndustryStandard/Tpm20.h>
 
STATIC  EFI_TCG2_PROTOCOL  *mTcg2Protocol = NULL;
 
EFI_STATUS
EFIAPI
Tpm2SubmitCommand (
  IN UINT32      InputParameterBlockSize,
  IN UINT8       *InputParameterBlock,
  IN OUT UINT32  *OutputParameterBlockSize,
  IN UINT8       *OutputParameterBlock
  )
{
  EFI_STATUS            Status;
  TPM2_RESPONSE_HEADER  *Header;
 
  if (mTcg2Protocol == NULL) {
    Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **)&mTcg2Protocol);
    if (EFI_ERROR (Status)) {
      //
      // Tcg2 protocol is not installed. So, TPM2 is not present.
      //
      DEBUG ((DEBUG_ERROR, "Tpm2SubmitCommand - Tcg2 - %r\n", Status));
      return EFI_NOT_FOUND;
    }
  }
 
  //
  // Assume when Tcg2 Protocol is ready, RequestUseTpm already done.
  //
  Status = mTcg2Protocol->SubmitCommand (
                            mTcg2Protocol,
                            InputParameterBlockSize,
                            InputParameterBlock,
                            *OutputParameterBlockSize,
                            OutputParameterBlock
                            );
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  Header                    = (TPM2_RESPONSE_HEADER *)OutputParameterBlock;
  *OutputParameterBlockSize = SwapBytes32 (Header->paramSize);
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Tpm2RequestUseTpm (
  VOID
  )
{
  EFI_STATUS  Status;
 
  if (mTcg2Protocol == NULL) {
    Status = gBS->LocateProtocol (&gEfiTcg2ProtocolGuid, NULL, (VOID **)&mTcg2Protocol);
    if (EFI_ERROR (Status)) {
      //
      // Tcg2 protocol is not installed. So, TPM2 is not present.
      //
      DEBUG ((DEBUG_ERROR, "Tpm2RequestUseTpm - Tcg2 - %r\n", Status));
      return EFI_NOT_FOUND;
    }
  }
 
  //
  // Assume when Tcg2 Protocol is ready, RequestUseTpm already done.
  //
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Tpm2RegisterTpm2DeviceLib (
  IN TPM2_DEVICE_INTERFACE  *Tpm2Device
  )
{
  return EFI_UNSUPPORTED;
}