text: /**
  ********************************************************************************
  \file   pdoucalmem-hostif.c
  
  \brief  PDO user CAL shared-memory module using host interface IP-Core
  
  This file contains an implementation for the user PDO CAL shared-memroy module
  which uses host interface IP-Core. The shared memory is used to transfer
  PDO data between user and kernel layer. This implementation is used if user and
  kernel layer are separated by the host interface IP-Core.
  
  \ingroup module_pdoucal
  *******************************************************************************/
  
  /*------------------------------------------------------------------------------
  Copyright (c) 2014, Bernecker+Rainer Industrie-Elektronik Ges.m.b.H. (B&R)
  All rights reserved.
  
  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.
      * Neither the name of the copyright holders nor the
        names of its contributors may be used to endorse or promote products
        derived from this software without specific prior written permission.
  
  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 COPYRIGHT HOLDERS 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.
  ------------------------------------------------------------------------------*/
  
  //------------------------------------------------------------------------------
  // includes
  //------------------------------------------------------------------------------
  #include <common/oplkinc.h>
  #include <user/pdoucal.h>
  
  #include <hostiflib.h>
  
  //============================================================================//
  //            G L O B A L   D E F I N I T I O N S                             //
  //============================================================================//
  
  //------------------------------------------------------------------------------
  // const defines
  //------------------------------------------------------------------------------
  
  //------------------------------------------------------------------------------
  // module global vars
  //------------------------------------------------------------------------------
  
  //------------------------------------------------------------------------------
  // global function prototypes
  //------------------------------------------------------------------------------
  
  //============================================================================//
  //            P R I V A T E   D E F I N I T I O N S                           //
  //============================================================================//
  
  //------------------------------------------------------------------------------
  // const defines
  //------------------------------------------------------------------------------
  
  //------------------------------------------------------------------------------
  // local types
  //------------------------------------------------------------------------------
  typedef struct
  {
      UINT8*  pBase;
      UINT    span;
  } tLimInstance;
  
  //------------------------------------------------------------------------------
  // local vars
  //------------------------------------------------------------------------------
  static tLimInstance         limPdo_l;
  
  //------------------------------------------------------------------------------
  // local function prototypes
  //------------------------------------------------------------------------------
  
  //============================================================================//
  //            P U B L I C   F U N C T I O N S                                 //
  //============================================================================//
  
  //------------------------------------------------------------------------------
  /**
  \brief  Open PDO shared memory
  
  The function performs all actions needed to setup the shared memory at the
  start of the stack.
  
  \return The function returns a tOplkError error code.
  
  \ingroup module_pdokcal
  */
  //------------------------------------------------------------------------------
  tOplkError pdoucal_openMem(void)
  {
      tHostifReturn hifret;
      tHostifInstance pInstance = hostif_getInstance(0);
  
      if (pInstance == NULL)
      {
          DEBUG_LVL_ERROR_TRACE("%s() couldn't get Pcp hostif instance\n",
                                __func__);
          return kErrorNoResource;
      }
  
      hifret = hostif_getBuf(pInstance, kHostifInstIdPdo, &limPdo_l.pBase, &limPdo_l.span);
  
      if (hifret != kHostifSuccessful)
      {
          DEBUG_LVL_ERROR_TRACE("%s() Could not get buffer from host interface (%d)\n",
                                __func__, hifret);
          return kErrorNoResource;
      }
  
      return kErrorOk;
  }
  
  //------------------------------------------------------------------------------
  /**
  \brief  Close PDO shared memory
  
  The function performs all actions needed to clean up the shared memory at
  shutdown.
  
  \return The function returns a tOplkError error code.
  
  \ingroup module_pdokcal
  */
  //------------------------------------------------------------------------------
  tOplkError pdoucal_closeMem(void)
  {
      OPLK_MEMSET(&limPdo_l, 0, sizeof(limPdo_l));
  
      return kErrorOk;
  }
  
  //------------------------------------------------------------------------------
  /**
  \brief  Allocate PDO shared memory
  
  The function allocates shared memory for the kernel needed to transfer the PDOs.
  
  \param  memSize_p               Size of PDO memory
  \param  ppPdoMem_p              Pointer to store the PDO memory pointer.
  
  \return The function returns a tOplkError error code.
  
  \ingroup module_pdokcal
  */
  //------------------------------------------------------------------------------
  tOplkError pdoucal_allocateMem(size_t memSize_p, BYTE** ppPdoMem_p)
  {
      if (memSize_p > limPdo_l.span)
      {
          DEBUG_LVL_ERROR_TRACE("%s() out of memory (%d > %d)\n",
                                __func__, memSize_p, limPdo_l.span);
          return kErrorNoResource;
      }
  
      *ppPdoMem_p = limPdo_l.pBase;
  
      return kErrorOk;
  }
  
  //------------------------------------------------------------------------------
  /**
  \brief  Free PDO shared memory
  
  The function frees shared memory which was allocated in the kernel layer for
  transfering the PDOs.
  
  \param  pMem_p                  Pointer to the shared memory segment.
  \param  memSize_p               Size of PDO memory
  
  \return The function returns a tOplkError error code.
  
  \ingroup module_pdokcal
  */
  //------------------------------------------------------------------------------
  tOplkError pdoucal_freeMem(BYTE* pMem_p, size_t memSize_p)
  {
      UNUSED_PARAMETER(pMem_p);
      UNUSED_PARAMETER(memSize_p);
  
      DEBUG_LVL_PDO_TRACE("%s() try to free address %p (%p)\n",
                          __func__, pMem_p, limPdo_l.pBase);
  
      return kErrorOk;
  }
  
  //============================================================================//
  //            P R I V A T E   F U N C T I O N S                               //
  //============================================================================//
  /// \name Private Functions
  /// \{
  
  ///\}
  