common/syscontext.c

//**********************************************************************;
// Copyright (c) 2015, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//**********************************************************************;

#include "sapi/tpm20.h"
#include <stdio.h>
#include <stdlib.h>
#include "sysapi_util.h"


// Allocates space for and initializes system
// context structure.
// Returns:
//   ptr to system context, if successful
//   NULL pointer, if not successful.

TSS2_SYS_CONTEXT *InitSysContext(
    UINT16 maxCommandSize,
    TSS2_TCTI_CONTEXT *tctiContext,
    TSS2_ABI_VERSION *abiVersion
 )
{
    UINT32 contextSize;
    TSS2_RC rval;
    TSS2_SYS_CONTEXT *sysContext;

    // Get the size needed for system context structure.
    contextSize = Tss2_Sys_GetContextSize( maxCommandSize );

    // Allocate the space for the system context structure.
    sysContext = malloc( contextSize );

    if( sysContext != 0 )
    {
        // Initialized the system context structure.
        rval = Tss2_Sys_Initialize( sysContext, contextSize, tctiContext, abiVersion );

        if( rval == TSS2_RC_SUCCESS )
            return sysContext;
        else
            return 0;
    }
    else
    {
        return 0;
    }
}

void TeardownSysContext( TSS2_SYS_CONTEXT **sysContext )
{
    if( *sysContext != 0 )
    {
        Tss2_Sys_Finalize(*sysContext);

        free(*sysContext);
        *sysContext = 0;
    }
}