Tpm2Context.c

Go to the documentation of this file.

 
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
 
#pragma pack(1)
 
typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_DH_CONTEXT        FlushHandle;
} TPM2_FLUSH_CONTEXT_COMMAND;
 
typedef struct {
  TPM2_RESPONSE_HEADER    Header;
} TPM2_FLUSH_CONTEXT_RESPONSE;
 
#pragma pack()
 
EFI_STATUS
EFIAPI
Tpm2FlushContext (
  IN      TPMI_DH_CONTEXT  FlushHandle
  )
{
  EFI_STATUS                   Status;
  TPM2_FLUSH_CONTEXT_COMMAND   SendBuffer;
  TPM2_FLUSH_CONTEXT_RESPONSE  RecvBuffer;
  UINT32                       SendBufferSize;
  UINT32                       RecvBufferSize;
 
  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_NO_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_FlushContext);
 
  SendBuffer.FlushHandle = SwapBytes32 (FlushHandle);
 
  SendBufferSize              = (UINT32)sizeof (SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);
 
  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2FlushContext - RecvBufferSize Error - %x\n", RecvBufferSize));
    return EFI_DEVICE_ERROR;
  }
 
  if (SwapBytes32 (RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2FlushContext - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
    return EFI_DEVICE_ERROR;
  }
 
  return EFI_SUCCESS;
}