Tpm12DeviceLibTcg.c

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#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/Tpm12DeviceLib.h>
#include <Protocol/TcgService.h>
#include <IndustryStandard/Tpm12.h>
 
EFI_TCG_PROTOCOL  *mTcgProtocol = NULL;
 
EFI_STATUS
EFIAPI
Tpm12SubmitCommand (
  IN UINT32      InputParameterBlockSize,
  IN UINT8       *InputParameterBlock,
  IN OUT UINT32  *OutputParameterBlockSize,
  IN UINT8       *OutputParameterBlock
  )
{
  EFI_STATUS           Status;
  TPM_RSP_COMMAND_HDR  *Header;
 
  if (mTcgProtocol == NULL) {
    Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **)&mTcgProtocol);
    if (EFI_ERROR (Status)) {
      //
      // TCG protocol is not installed. So, TPM12 is not present.
      //
      DEBUG ((DEBUG_ERROR, "Tpm12SubmitCommand - TCG - %r\n", Status));
      return EFI_NOT_FOUND;
    }
  }
 
  //
  // Assume when TCG Protocol is ready, RequestUseTpm already done.
  //
  Status = mTcgProtocol->PassThroughToTpm (
                           mTcgProtocol,
                           InputParameterBlockSize,
                           InputParameterBlock,
                           *OutputParameterBlockSize,
                           OutputParameterBlock
                           );
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  Header                    = (TPM_RSP_COMMAND_HDR *)OutputParameterBlock;
  *OutputParameterBlockSize = SwapBytes32 (Header->paramSize);
 
  return EFI_SUCCESS;
}
 
EFI_STATUS
EFIAPI
Tpm12RequestUseTpm (
  VOID
  )
{
  EFI_STATUS  Status;
 
  if (mTcgProtocol == NULL) {
    Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **)&mTcgProtocol);
    if (EFI_ERROR (Status)) {
      //
      // TCG protocol is not installed. So, TPM12 is not present.
      //
      DEBUG ((DEBUG_ERROR, "Tpm12RequestUseTpm - TCG - %r\n", Status));
      return EFI_NOT_FOUND;
    }
  }
 
  //
  // Assume when TCG Protocol is ready, RequestUseTpm already done.
  //
  return EFI_SUCCESS;
}