Copyright (C) 2006 International Business Machines Corporation
Written by Kent Yoder based on the Trusted Computing Group Software Stack Specification Version 1.1 Golden

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1 TCG Software Stack Developer's Reference

Tspi_TPM_DirRead - Read a Data Integrity Register

 #include <tss/platform.h>  #include <tss/tcpa_defines.h>  #include <tss/tcpa_typedef.h>  #include <tss/tcpa_struct.h>  #include <tss/tss_typedef.h>  #include <tss/tss_structs.h>  #include <tss/tspi.h>  "TSS_RESULT Tspi_TPM_DirRead(TSS_HTPM " hTPM ", UINT32 " ulDirIndex ","  " UINT32* " pulDirDataLength ", BYTE** " prgbDirData ");" 

Tspi_TPM_DirRead reads a data integrity register. DIRs are non-volatile (persistent across reboots) memory areas maintained by the TPM.

The hTPM parameter is used to specify the handle of the TPM object. The ulDirIndex parameter is the index of the DIR to read. To query the TPM for the number of DIR registers it supports, use Tspi_TPM_GetCapability(3). The pulDirDataLength parameter receives the length in bytes of the prgbDirData parameter. The prgbDirData parameter receives a pointer to memory containing the DIR data.

Tspi_TPM_DirRead returns TSS_SUCCESS on success, otherwise one of the following values is returned:

TSS_E_INVALID_HANDLE hTPM is not a valid handle.

TSS_E_INTERNAL_ERROR An internal SW error has been detected.

TSS_E_BAD_PARAMETER One or more parameters is bad.

Tspi_TPM_DirRead conforms to the Trusted Computing Group Software Specification version 1.1 Golden

Tspi_TPM_GetCapability(3), Tspi_TPM_DirWrite(3).