view src/g23m-gsm/dl/dl_pei.c @ 220:0ed36de51973

ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents fa8dc04885d8
children
line wrap: on
line source

/*
+-----------------------------------------------------------------------------
|  Project :
|  Modul   :
+-----------------------------------------------------------------------------
|  Copyright 2002 Texas Instruments Berlin, AG
|                 All rights reserved.
|
|                 This file is confidential and a trade secret of Texas
|                 Instruments Berlin, AG
|                 The receipt of or possession of this file does not convey
|                 any rights to reproduce or disclose its contents or to
|                 manufacture, use, or sell anything it may describe, in
|                 whole, or in part, without the specific written consent of
|                 Texas Instruments Berlin, AG.
+-----------------------------------------------------------------------------
|  Purpose :  This module implements the process body interface
|             for the entity DL of the mobile station.
+-----------------------------------------------------------------------------
*/

#ifndef DL_PEI_C
#define DL_PEI_C

#define ENTITY_DL



/*==== INCLUDES ===================================================*/
#include "typedefs.h"
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include "vsi.h"
#include "pconst.cdg"
#include "custom.h"
#include "gsm.h"
#include "mon_dl.h"
#include "prim.h"
#include "pei.h"
#include "tok.h"
#include "ccdapi.h"
#include "dl.h"
#include "dl_em.h"
#include "dl_trc.h"

/*==== EXPORT =====================================================*/
#ifdef TI_PS_HCOMM_CHANGE
#else
GLOBAL T_HANDLE hCommDL         = VSI_ERROR;    /* Self  Communication */
GLOBAL T_HANDLE hCommRR         = VSI_ERROR;    /* RR  Communication */
GLOBAL T_HANDLE hCommPL         = VSI_ERROR;    /* PL  Communication */
#ifdef FF_EM_MODE
GLOBAL T_HANDLE hCommMMI        = VSI_ERROR;    /* EM  Communication */
#endif /* FF_EM_MODE */
#endif
GLOBAL USHORT dl_handle;

/*==== PRIVATE ====================================================*/

LOCAL void pei_not_supported (void *data);
LOCAL int dl_process_signal (ULONG opc, void *signal_data);

LOCAL SHORT pei_signal (T_SIGNAL_OPC opc, void *signal_data);

/*==== VARIABLES ==================================================*/
#ifdef _SIMULATION_
static UBYTE             first_access = TRUE;
#endif /* _SIMULATION_ */

static T_MONITOR         dl_mon;

/*==== FUNCTIONS ==================================================*/
/* Please consider that the opc´s are not necessarily sorted in sequential order.
 * DL doesn´t use the normal technique to get the primitive from the table.
 * Instead it uses the direct search and compare:
 * for (i=0; i<n; i++, table++)
 *  if (table->opc EQ opc)
 *    break;
 */
LOCAL const T_FUNC dl_table[] = {
  MAK_FUNC_S( drr_dl_establish_req      , DL_ESTABLISH_REQ     ), /* 0x80000003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x80010003 */
  MAK_FUNC_0( drr_dl_release_req        , DL_RELEASE_REQ       ), /* 0x80020003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x80030003 */
  MAK_FUNC_S( drr_dl_data_req           , DL_DATA_REQ          ), /* 0x80040003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x80050003 */
  MAK_FUNC_S( drr_dl_unitdata_req       , DL_UNITDATA_REQ      ), /* 0x80060003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x80070003 */
  MAK_FUNC_0( drr_dl_suspend_req        , DL_SUSPEND_REQ       ), /* 0x80080003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x80090003 */
  MAK_FUNC_S( drr_dl_resume_req         , DL_RESUME_REQ        ), /* 0x800a0003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x800b0003 */
  MAK_FUNC_S( drr_dl_reconnect_req      , DL_RECONNECT_REQ     ), /* 0x800c0003 */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x800d0003 */
#if defined (DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE)
  MAK_FUNC_0( dl_trace_read_all         , DL_TRACE_REQ         ), /* 0x800e0003 */
#else
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x800e0003 */
#endif /* DL_TRACE_ENABLED && !DL_IMMEDIATE_TRACE */
  MAK_FUNC_N( pei_not_supported         , 0                    ), /* 0x800f0003 */
  MAK_FUNC_S( drr_dl_short_unitdata_req , DL_SHORT_UNITDATA_REQ)  /* 0x80100003 */
};

LOCAL const T_FUNC mphc_table[] = {
  MAK_FUNC_0( dph_ph_data_ind, PH_DATA_IND )                      /* 0x0000006d */
};


#if defined (DL_2TO1)
  #if defined(_SIMULATION_)
    LOCAL const T_FUNC l1_test_table[] = {
      MAK_FUNC_0( l1test_call_mphc_read_dcch, L1TEST_CALL_MPHC_READ_DCCH    ), /* 8000409b */
      MAK_FUNC_N( pei_not_supported         , 0                             )  /* removed */
      MAK_FUNC_N( pei_not_supported         , 0                             )  /* removed */
    };
  #endif  /* _SIMULATION_ */
#else /* DL_2TO1 */

  LOCAL const T_FUNC mdl_table[] = {
    MAK_FUNC_0( drr_mdl_release_req     , MDL_RELEASE_REQ      ) /* 0x80004004 */
  };

  #if defined (_SIMULATION_) || (defined (DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE))
    LOCAL const T_FUNC ph_table[] = {
    #if defined(_SIMULATION_)
        MAK_FUNC_0( dph_ph_ready_to_send    , PH_READY_TO_SEND     ), /* 0x4100 */
    #else
        MAK_FUNC_N( pei_not_supported       , 0                    ), /* 0x4100 */
    #endif  /* _SIMULATION_ */
        MAK_FUNC_N( pei_not_supported       , 0                    ), /* 0x4101 */
    #if defined (DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE)
        MAK_FUNC_0( dl_trace_read           , PH_TRACE_IND         )  /* 0x4102 */
    #else
        MAK_FUNC_N( pei_not_supported       , 0                    )  /* 0x4102 */
    #endif /* DL_TRACE_ENABLED && !DL_IMMEDIATE_TRACE*/
    };
  #endif  /* _SIMULATION_||(DL_TRACE_ENABLED&& !DL_IMMEDIATE_TRACE) */
#endif /* DL_2TO1 */

#ifdef FF_EM_MODE
LOCAL const T_FUNC em_ul_table[] = {
  MAK_FUNC_0( dl_em_dl_event_req      , EM_DL_EVENT_REQ      ), /* 0x3e0A*/
};
#endif /* FF_EM_MODE */


/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_primitive       |
+--------------------------------------------------------------------+

  PURPOSE : Process protocol specific primitive.

*/
LOCAL SHORT pei_primitive (void * ptr)
{
  GET_INSTANCE_DATA;
  T_PRIM *prim = (T_PRIM*)ptr;
  /*
   *             |            |
   *            DL           MDL
   *             |            |
   *      +------v------------v------+
   *      |                          |
   *      |            DL            |
   *      |                          |
   *      +-------------^------------+
   *                    |
   *                 MPHC/PH
   *                    |
   *
   */

  TRACE_FUNCTION ("pei_primitive()");

  if (prim NEQ NULL)
  {
    ULONG           opc = prim->custom.opc;
    USHORT          n;
    const T_FUNC    *table;

    VSI_PPM_REC ((T_PRIM_HEADER*)prim, __FILE__, __LINE__);

    PTRACE_IN (opc);

    switch (SAP_NR(opc))
    {
      case SAP_NR(DL_UL):   table =  dl_table; n = TAB_SIZE (dl_table); break;
      /*case SAP_NR(MPHC_UL):*/ /* same as MPHC_DL */
      case SAP_NR(MPHC_DL):   
        table =  mphc_table; 
        n = TAB_SIZE (mphc_table); 
        /*
         * The opcodes for MPHC_DL start at 0x6d
         */
        opc -= 0x6d; 
        break;
#if defined (DL_2TO1)
  #if defined(_SIMULATION_)
      case SAP_NR(L1TEST_UL):
      case SAP_NR(L1TEST_DL):   table =  l1_test_table; n = TAB_SIZE (l1_test_table); break;
  #endif /* _SIMULATION_ */
#else /* DL_2TO1 */
      case SAP_NR(MDL_DL):  table = mdl_table; n = TAB_SIZE (mdl_table); break;
  #if defined (_SIMULATION_) || (defined (DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE))
      case SAP_NR(PH_UL):
      case SAP_NR(PH_DL):   table =  ph_table; n = TAB_SIZE (ph_table); break;
  #endif  /* _SIMULATION_||(DL_TRACE_ENABLED&&!DL_IMMEDIATE_TRACE) */
#endif /* DL_2TO1 */

#ifdef FF_EM_MODE
      case EM_Ul:           
        table = em_ul_table; 
        n = TAB_SIZE (em_ul_table); 
        /*
         * The opcodes for EM_Ul start at 0x0a
         */        
        opc -= 0x0a; 
        break;
#endif /* FF_EM_MODE*/
      default    : table = NULL;      n = 0;                      break;
    }
    if (table)
    {

#if defined (_SIMULATION_)
      if (opc NEQ PH_READY_TO_SEND)
      /*
       * this simulates function call of layer 1 in the
       * windows environment
       */
#endif /* _SIMULATION_ */
      dl_data->dl_active = TRUE;


      if (PRIM_NR(opc)<n)
      {
        table += PRIM_NR(opc);
#ifdef PALLOC_TRANSITION
        /*lint -e661 (Warning -- Possible access of out-of-bounds) */
        P_SDU(prim) = table->soff ? (T_sdu*) (((char*)&prim->data) + table->soff) : 0;
        /*lint +e661 (Warning -- Possible access of out-of-bounds) */
#ifndef NO_COPY_ROUTING
        P_LEN(prim) = table->size + sizeof (T_PRIM_HEADER);
#endif /* NO_COPY_ROUTING */
#endif /* PALLOC_TRANSITION */

#if defined (DL_TRACE_ENABLED) && !defined(DL_2TO1)
        if ((opc EQ DL_TRACE_REQ) OR (opc EQ PH_TRACE_IND))
          /*lint -e661 (Warning -- Possible access of out-of-bounds) */
          JUMP (table->func)();
          /*lint +e661 (Warning -- Possible access of out-of-bounds) */
        else
#endif /* DL_TRACE_ENABLED && !DL_2TO1 */
          /*lint -e661 (Warning -- Possible access of out-of-bounds) */
          JUMP (table->func) (P2D(prim));
          /*lint +e661 (Warning -- Possible access of out-of-bounds) */
      }
      else
      {
        pei_not_supported (P2D(prim));
      }
      dl_data->dl_active = FALSE;

      return PEI_OK;
    }

#if defined (_SIMULATION_)
    /* TDC is not able to send signals, therefore the redirection over primitives */
    if (opc EQ DL_SIGNAL_EM_READ)
    { /* test ACI read of EM buffer only */
      return dl_process_signal(DL_SIGNAL_EM_READ, NULL);
    }
#endif /* _SIMULATION_ */

    /*
     * Primitive is no GSM Primitive
     * then forward to the environment
     */

#ifdef GSM_ONLY
    MY_PFREE (P2D(prim))

    return PEI_ERROR;
#else
    if (opc & SYS_MASK)
      vsi_c_primitive (VSI_CALLER prim);
    else
    {
      void* p = (void*)P2D(prim);
      MY_PFREE (p);
      return PEI_ERROR;
    }
#endif
  }
  return PEI_OK;
}

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_not_supported   |
+--------------------------------------------------------------------+

  PURPOSE : An unsupported primitive is received.

*/

LOCAL void pei_not_supported (void * data)
{
  TRACE_FUNCTION ("pei_not_supported()");

  MY_PFREE (data);
}


/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_init            |
+--------------------------------------------------------------------+

  PURPOSE : Initialize Protocol Stack Entity

*/

LOCAL SHORT pei_init (T_HANDLE handle)
{
  dl_handle = handle;

  TRACE_FUNCTION ("pei_init() " __DATE__ " " __TIME__);

#ifdef TI_PS_HCOMM_CHANGE
  if (!cl_hcom_all_handles_open())
  {
    return PEI_ERROR;
  }
#else /* for hCommHandles backward compatibility */
  if (hCommDL < VSI_OK)
  {
    if ((hCommDL = vsi_c_open (VSI_CALLER DL_NAME)) < VSI_OK)
      return PEI_ERROR;
  }

  if (hCommRR < VSI_OK)
  {
    if ((hCommRR = vsi_c_open (VSI_CALLER RR_NAME)) < VSI_OK)
      return PEI_ERROR;
  }


  if (hCommPL < VSI_OK)
  {
    if ((hCommPL = vsi_c_open (VSI_CALLER PL_NAME)) < VSI_OK)
      return PEI_ERROR;
  }

#ifdef FF_EM_MODE
  if (hCommMMI < VSI_OK)
  {
    if ((hCommMMI = vsi_c_open (VSI_CALLER ACI_NAME)) < VSI_OK)
      return PEI_ERROR;
  }
#endif /* FF_EM_MODE */
#endif

  TRC_INIT ();

#if !defined(_SIMULATION_)
  TRACE_EVENT (dl_version());
  SYST_TRACE (dl_version());
#endif  /* !_SIMULATION_ */

  /*
   * Initialize data base
   */

#if defined(DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE)
  dl_trace_init ();
#endif  /* DL_TRACE_ENABLED && !DL_IMMEDIATE_TRACE*/

  com_init_data ();
  dcch0_init_dl_data ();
  sacch0_init_dl_data ();

#ifdef FF_EM_MODE
  /*
   initialise event flags
  */
  em_init_dl_event_trace();
  /*
   initialise dl semaphor for EM event tracing
  */
  em_dl_sem_init();
#endif /* FF_EM_MODE */

  return PEI_OK;
}

#ifdef _SIMULATION_
/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_exit            |
+--------------------------------------------------------------------+

  PURPOSE : Close Resources and terminate

*/
LOCAL SHORT pei_exit (void)
{
  TRACE_FUNCTION ("pei_exit()");

#if defined(DL_TRACE_ENABLED) && !defined(DL_IMMEDIATE_TRACE)
  dl_trace_exit ();
#endif  /* DL_TRACE_ENABLED && !DL_IMMEDIATE_TRACE*/

#ifdef FF_EM_MODE
  em_dl_sem_exit();
#endif /* FF_EM_MODE */

  /*
   * clean up communication
   */
#ifdef TI_PS_HCOMM_CHANGE
#else /* for hCommHandles backward compatibility */
  vsi_c_close (VSI_CALLER hCommDL);
  hCommDL = VSI_ERROR;

  vsi_c_close (VSI_CALLER hCommRR);
  hCommRR = VSI_ERROR;

  vsi_c_close (VSI_CALLER hCommPL);
  hCommPL = VSI_ERROR;

#ifdef FF_EM_MODE
  vsi_c_close (VSI_CALLER hCommMMI);
  hCommMMI = VSI_ERROR;
#endif /* FF_EM_MODE */
#endif

  TRC_EXIT ();

  return PEI_OK;
}
#endif /* _SIMULATION_ */

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_config          |
+--------------------------------------------------------------------+

  PURPOSE : Dynamic Configuration

*/

/* Implements Measure#36 */
#ifdef NCONFIG
#else /* NCONFIG */
LOCAL SHORT pei_config (T_PEI_CONFIG inString)
{
  return PEI_OK;
}
#endif /* NCONFIG */

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : dl_pei_config       |
+--------------------------------------------------------------------+

  PURPOSE : Dynamic Configuration

*/
/* Implements Measure#36 */
#ifdef NCONFIG
#else /* NCONFIG */
GLOBAL T_PEI_RETURN dl_pei_config ( char * inString, char * dummy )
{
  return pei_config ( inString );
}
#endif /* NCONFIG */

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_monitor         |
+--------------------------------------------------------------------+

  PURPOSE : Monitoring of physical Parameters

*/

LOCAL SHORT pei_monitor (void ** monitor)
{
  TRACE_FUNCTION ("pei_monitor()");

/* Implements Measure#32: Row 50 */

  * monitor = &dl_mon;

  return PEI_OK;
}

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_create          |
+--------------------------------------------------------------------+

  PURPOSE : Create the Protocol Stack Entity

*/

/*
 * New Frame
 */
GLOBAL T_PEI_RETURN dl_pei_create (T_PEI_INFO **info)
{
  static const T_PEI_INFO pei_info =
  {
    "DL",
    {
      pei_init,
#ifdef _SIMULATION_
      pei_exit,
#else
      NULL,
#endif
      pei_primitive,
      NULL,             /* no timeout function */
      pei_signal,       /* signal function     */
      NULL,             /* no run function     */
/* Implements Measure#36 */
#ifdef NCONFIG
      NULL,             /* no pei_config function     */
#else /* NCONFIG */
      pei_config,
#endif /* NCONFIG */
      pei_monitor,
    },
    #if defined (GPRS)
    1536,                             /* Stack Size incresed for omaps00140330      */
    #else
    #if defined (FAX_AND_DATA)
    1536,                             /* Stack Size incresed for omaps00140330      */
    #else
    1394,                            /* Stack Size incresed for omaps00140330      */
    #endif
    #endif
    10+DL_SIGNAL_DATA_ELEMENTS,     /* Queue Entries   */
    215,                            /* Priority        */
    0,                              /* number of timer */
                                    /* flags           */
#ifdef _TARGET_
#ifdef GPRS
    PASSIVE_BODY|COPY_BY_REF|TRC_NO_SUSPEND|PRIM_NO_SUSPEND|INT_DATA_TASK
#else
    PASSIVE_BODY|COPY_BY_REF|TRC_NO_SUSPEND|PRIM_NO_SUSPEND
#endif
#else
    PASSIVE_BODY|COPY_BY_REF
#endif

  };

  TRACE_FUNCTION ("pei_create");
  /*
   *  Close Resources if open
   */

#ifdef _SIMULATION_
  if (first_access)
    first_access = FALSE;
  else
    pei_exit ();
#endif

  /*
   * export startup configuration data
   */
  *info = (T_PEI_INFO *)&pei_info;
  /*
   *  Initialize entity data
   */

  /*
   *  Initialize Condat Coder Decoder and
   *  processes
   */


  return PEI_OK;
}

/*
+--------------------------------------------------------------------+
| PROJECT : GSM-PS (6147)              MODULE  : DL_PEI              |
| STATE   : code                       ROUTINE : pei_signal          |
+--------------------------------------------------------------------+

  PURPOSE : Functional interface to signal a primitive.

*/
LOCAL SHORT pei_signal (T_SIGNAL_OPC opc, void *signal_data)
{
#ifdef TRACE_FKT
  {
    char buf[24];
    sprintf(buf, "pei_signal (0x%lx)", (ULONG)opc);
    TRACE_FUNCTION (buf);
    PTRACE_IN(opc);
  }
#elif defined(_SIMULATION_)
  TRACE_EVENT_WIN_P1 ("pei_signal (0x%lx)", (ULONG)opc);
#endif

  dl_process_signal ((ULONG)opc, signal_data);

  return PEI_OK;
}

LOCAL int dl_process_signal (ULONG opc, void *signal_data)
{
  /*TRACE_FUNCTION ("pei_process_signal()");*/
  GET_INSTANCE_DATA;
  switch (opc)
  {
#if defined(DL_TRACE_ENABLED) && !defined (DL_IMMEDIATE_TRACE) && !defined(DL_2TO1)
  case DL_TRACE_REQ:  /* RR -> DL */
    SYST_TRACE("call dl_trace_read_all()");
    dl_trace_read_all ();
    break;
  case PH_TRACE_IND:  /* ALR/TIL -> DL */
    dl_trace_read ();
    break;
#endif  /* DL_TRACE_ENABLED && !DL_IMMEDIATE_TRACE &6 !DL_2TO1 */
#if defined(INVOKE_SIGNAL)
  case DL_SIGNAL_ESTABLISH_IND:
    sig_handle_drr_dl_establish_ind ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_ESTABLISH_CNF:
    sig_handle_drr_dl_establish_cnf ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_DATA_IND:
    sig_handle_com_data_ind ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_DATA_CNF:
    sig_handle_drr_dl_data_cnf ((T_DL_SIGNAL_DATA *) signal_data);
    break;
#if 0 /* happens in primitive context only */
  case DL_SIGNAL_UNITDATA_IND:
    sig_handle_drr_dl_unitdata_ind (dl_data, (T_DL_SIGNAL_DATA *) signal_data);
    break;
#endif  /* 0 */
  case DL_SIGNAL_SHORT_UNITDATA_IND:
    sig_handle_drr_dl_short_unitdata_ind ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_RELEASE_IND:
    sig_handle_drr_dl_release_ind ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_RELEASE_CNF:
    sig_handle_drr_dl_release_cnf ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_ERROR_IND:
    sig_handle_drr_error_ind ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_FREE_POINTER:
    sig_handle_com_free_pointer ((T_DL_SIGNAL_DATA *) signal_data);
    break;
  case DL_SIGNAL_CONCATENATE:
    sig_handle_com_concatenate((T_DL_SIGNAL_DATA *) signal_data);
    break;
#if defined(DL_TRACE_ENABLED)
  case DL_SIGNAL_L2TRACE:
    sig_handle_com_l2trace ((T_DL_SIGNAL_DATA *) signal_data);
    break;
#endif /*DL_TRACE_ENABLED*/
  case DL_SIGNAL_L3TRACE:
    sig_handle_com_l3trace((T_DL_SIGNAL_DATA *) signal_data);
    break;
#if defined(FF_EM_MODE)
  case DL_SIGNAL_EM_IND:
    sig_handle_dl_em_first_event_check ();
    break;
  case DL_SIGNAL_EM_WRITE:
    sig_handle_dl_em_write (dl_data, (T_DL_SIGNAL_DATA *) signal_data);
    break;
#if defined(_SIMULATION_)
  case DL_SIGNAL_EM_READ:
    {
      T_MONITOR *dummy;

      em_dl_sem_read ();
      em_dl_sem_reset ();
      pei_monitor (&dummy);
      TRACE_EVENT_WIN (dummy->version);
    }
    break;
#endif  /* _SIMULATION_ */
#endif  /* FF_EM_MODE */
#endif /* INVOKE_SIGNAL */
  default:
    break;
  }

#if defined(INVOKE_SIGNAL)
  if (signal_data)
  {
    TRACE_EVENT_WIN_P1 ("pei_process_signal(): set data with idx=%u to FREE",
      ((T_DL_SIGNAL_DATA *)signal_data)->idx);

    ((T_DL_SIGNAL_DATA *)signal_data)->busy = FALSE;
  }
#endif /* INVOKE_SIGNAL */

  return PEI_OK;
}/* dl_process_signal */

GLOBAL UBYTE * dl_get_sacch_buffer (void)
{
  GET_INSTANCE_DATA;
  return dl_data->sacch_act_buffer.buf;
}

#endif  /* DL_PEI_C */