/* Microsoft Reference Implementation for TPM 2.0
 *
 *  The copyright in this software is being made available under the BSD License,
 *  included below. This software may be subject to other third party and
 *  contributor rights, including patent rights, and no such rights are granted
 *  under this license.
 *
 *  Copyright (c) Microsoft Corporation
 *
 *  All rights reserved.
 *
 *  BSD License
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this list
 *  of conditions and the following disclaimer.
 *
 *  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 "Tpm.h"
#include "_TPM_Init_fp.h"

 // This function is used to process a _TPM_Init indication.
LIB_EXPORT void
_TPM_Init(
    void
    )
{
    g_powerWasLost = g_powerWasLost | _plat__WasPowerLost();

#if SIMULATION && DEBUG
    // If power was lost and this was a simulation, put canary in RAM used by NV
    // so that uninitialized memory can be detected more easily
    if(g_powerWasLost)
    {
        memset(&gc, 0xbb, sizeof(gc));
        memset(&gr, 0xbb, sizeof(gr));
        memset(&gp, 0xbb, sizeof(gp));
        memset(&go, 0xbb, sizeof(go));
    }
#endif   

#if SIMULATION
    // Clear the flag that forces failure on self-test
    g_forceFailureMode = FALSE;
#endif

    // Disable the tick processing
    _plat__ACT_EnableTicks(FALSE);

    // Set initialization state
    TPMInit();

    // Set g_DRTMHandle as unassigned
    g_DRTMHandle = TPM_RH_UNASSIGNED;

    // No H-CRTM, yet.
    g_DrtmPreStartup = FALSE;

    // Initialize the NvEnvironment.
    g_nvOk = NvPowerOn();
    
    // Initialize cryptographic functions
    g_inFailureMode = (CryptInit() == FALSE);
    if(!g_inFailureMode)
    {
        // Load the persistent data
        NvReadPersistent();

        // Load the orderly data (clock and DRBG state).
        // If this is not done here, things break
        NvRead(&go, NV_ORDERLY_DATA, sizeof(go));

        // Start clock. Need to do this after NV has been restored.
        TimePowerOn();
    }
    return;
}