Tpm2DeviceLibRouterPei.c

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#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/Tpm2DeviceLib.h>
 
EFI_GUID  mInternalTpm2DeviceInterfaceGuid = {
  0x349cf818, 0xc0ba, 0x4c43, { 0x92, 0x9a, 0xc8, 0xa1, 0xb1, 0xb3, 0xd2, 0x55 }
};
 
TPM2_DEVICE_INTERFACE *
InternalGetTpm2DeviceInterface (
  VOID
  )
{
  EFI_HOB_GUID_TYPE  *Hob;
 
  Hob = GetFirstGuidHob (&mInternalTpm2DeviceInterfaceGuid);
  if (Hob == NULL) {
    return NULL;
  }
 
  return (TPM2_DEVICE_INTERFACE *)(Hob + 1);
}
 
EFI_STATUS
EFIAPI
Tpm2SubmitCommand (
  IN UINT32      InputParameterBlockSize,
  IN UINT8       *InputParameterBlock,
  IN OUT UINT32  *OutputParameterBlockSize,
  IN UINT8       *OutputParameterBlock
  )
{
  TPM2_DEVICE_INTERFACE  *Tpm2DeviceInterface;
 
  Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
  if (Tpm2DeviceInterface == NULL) {
    return EFI_UNSUPPORTED;
  }
 
  return Tpm2DeviceInterface->Tpm2SubmitCommand (
                                InputParameterBlockSize,
                                InputParameterBlock,
                                OutputParameterBlockSize,
                                OutputParameterBlock
                                );
}
 
EFI_STATUS
EFIAPI
Tpm2RequestUseTpm (
  VOID
  )
{
  TPM2_DEVICE_INTERFACE  *Tpm2DeviceInterface;
 
  Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
  if (Tpm2DeviceInterface == NULL) {
    return EFI_UNSUPPORTED;
  }
 
  return Tpm2DeviceInterface->Tpm2RequestUseTpm ();
}
 
EFI_STATUS
EFIAPI
Tpm2RegisterTpm2DeviceLib (
  IN TPM2_DEVICE_INTERFACE  *Tpm2Device
  )
{
  TPM2_DEVICE_INTERFACE  *Tpm2DeviceInterface;
 
  if (!CompareGuid (PcdGetPtr (PcdTpmInstanceGuid), &Tpm2Device->ProviderGuid)) {
    DEBUG ((DEBUG_WARN, "WARNING: Tpm2RegisterTpm2DeviceLib - does not support %g registration\n", &Tpm2Device->ProviderGuid));
    return EFI_UNSUPPORTED;
  }
 
  Tpm2DeviceInterface = InternalGetTpm2DeviceInterface ();
  if (Tpm2DeviceInterface != NULL) {
    //
    // In PEI phase, there will be shadow driver dispatched again.
    //
    DEBUG ((DEBUG_INFO, "Tpm2RegisterTpm2DeviceLib - Override\n"));
    CopyMem (Tpm2DeviceInterface, Tpm2Device, sizeof (*Tpm2Device));
    return EFI_SUCCESS;
  } else {
    Tpm2Device = BuildGuidDataHob (&mInternalTpm2DeviceInterfaceGuid, Tpm2Device, sizeof (*Tpm2Device));
    if (Tpm2Device != NULL) {
      return EFI_SUCCESS;
    } else {
      return EFI_OUT_OF_RESOURCES;
    }
  }
}