--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/g23m-gsm/dl/dl_dcch3.c	Fri Oct 16 06:25:50 2020 +0000
@@ -0,0 +1,307 @@
+/*
++-----------------------------------------------------------------------------
+|  Project :  GSM-PS
+|  Modul   :  DL_DCCH3
++-----------------------------------------------------------------------------
+|  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 Modul defines the functions for the slow
+|             dedicated control channel (SAPI 3) of the component DL
++-----------------------------------------------------------------------------
+*/
+
+#ifndef DL_DCCH3_C
+#define DL_DCCH3_C
+
+#define ENTITY_DL
+
+/*==== INCLUDES ===================================================*/
+
+#include "typedefs.h"
+#include <string.h>
+#include "pconst.cdg"
+#include "vsi.h"
+#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_trc.h"
+
+
+/*==== EXPORT =====================================================*/
+
+/*==== PRIVAT =====================================================*/
+
+/*==== VARIABLES ==================================================*/
+
+/*==== FUNCTIONS ==================================================*/
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DCCH3                   |
+| STATE   : code                ROUTINE : dcch3_init_dl_data         |
++--------------------------------------------------------------------+
+
+  PURPOSE : Initialisation of SDCCH data (SAPI 3) for an instance.
+
+*/
+
+GLOBAL void dcch3_init_dl_data (void)
+{
+  GET_INSTANCE_DATA;
+  T_CCH *pcch = &dl_data->cch[C_DCCH3];
+
+  TRACE_FUNCTION ("dcch3_init_dl_data()");
+
+  memset (pcch, 0, sizeof (T_CCH));
+  com_clear_queue (PS_SAPI_3);
+
+  if (dl_data->dcch3_in_msg)
+  {
+    COM_FREE_POINTER (dl_data->dcch3_in_msg);
+    dl_data->dcch3_in_msg = NULL;
+  }
+
+  dl_data->dcch3_disc_request  = FALSE;
+  set_channel_state(C_DCCH3, STATE_DISABLED);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DCCH3                   |
+| STATE   : code                ROUTINE : dcch3_enable               |
++--------------------------------------------------------------------+
+
+  PURPOSE : Enabling SAPI 3 connections.
+
+*/
+
+GLOBAL void dcch3_enable (UBYTE ch_type)
+{
+  GET_INSTANCE_DATA;
+  TRACE_FUNCTION ("dcch3_enable()");
+
+  switch (dl_data->state[C_DCCH3])
+  {
+    case STATE_DISABLED:
+      set_channel_state (C_DCCH3, STATE_IDLE_DL);
+      dl_data->cch[C_DCCH3].ch_type = ch_type;
+      break;
+    default:
+      break;
+  }
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DCCH3                   |
+| STATE   : code                ROUTINE : dcch3_establish_req       |
++--------------------------------------------------------------------+
+
+  PURPOSE : Establish Request for SDCCH (SAPI 3).
+
+*/
+
+GLOBAL void dcch3_establish_req (T_DL_ESTABLISH_REQ * est_req)
+{
+  GET_INSTANCE_DATA;
+  TRACE_FUNCTION ("dcch3_establish_req()");
+
+  DL_OFFLINE_TRACE (TRACE_DL_EVENT, C_DCCH3, est_req->ch_type, "est req");
+
+
+  switch (dl_data->state[C_DCCH3])
+  {
+    case STATE_IDLE_DL:
+    case STATE_DISABLED:
+    case STATE_MULTIPLE_FRAME_ESTABLISHED:
+    case STATE_TIMER_RECOVERY:
+      {
+        T_CCH *pcch = &dl_data->cch[C_DCCH3];
+
+        pcch->ch_type = est_req->ch_type;
+
+        dl_data->dcch3_disc_request  = FALSE;
+        dl_data->dcch3_unserved = com_queue_awaiting_transmission (PS_SAPI_3) ?
+                                  DL_UNSERVED : DL_ALL_DONE;
+
+        com_clear_queue (PS_SAPI_3);
+        pcch->vtx       = SABM_CMD;
+        pcch->time_flag = TRUE;
+        pcch->rc        = 0;
+        set_channel_state (C_DCCH3, STATE_AWAITING_ESTABLISHMENT);
+        TRACE_EVENT_WIN_P5 ("EST_REQ: %s SAPI=%u vtx=%s (%s#%u)", CH_TYPE_NAME[pcch->ch_type],
+                                            est_req->sapi, VTX_NAME[pcch->vtx],
+                                            __FILE10__, __LINE__);
+      }
+
+      break;
+    default:
+      break;
+  }
+  COM_FREE_POINTER (est_req);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_SDCCH                   |
+| STATE   : code                ROUTINE : sdcch3_release_req         |
++--------------------------------------------------------------------+
+
+  PURPOSE : Release Request for SDCCH (SAPI 3).
+
+*/
+
+GLOBAL BOOL dcch3_release_req (T_DL_RELEASE_REQ * release_req)
+{
+  GET_INSTANCE_DATA;
+  BOOL bFree = TRUE;
+
+  TRACE_FUNCTION ("dcch3_release_req()");
+
+  if (release_req->mode EQ DL_LOCAL_END_RELEASE)
+  {
+    DL_OFFLINE_TRACE (TRACE_DL_EVENT, C_DCCH3, release_req->ch_type, "local end release req");
+    bFree = FALSE;
+  }
+  else
+  {
+    DL_OFFLINE_TRACE (TRACE_DL_EVENT, C_DCCH3, release_req->ch_type, "normal release req");
+    dl_data->cch[C_DCCH3].ch_type = release_req->ch_type;
+    switch (dl_data->state[C_DCCH3])
+    {
+      default:
+        bFree = FALSE;
+        break;
+
+      case STATE_AWAITING_ESTABLISHMENT:
+      case STATE_MULTIPLE_FRAME_ESTABLISHED:
+      case STATE_TIMER_RECOVERY:
+        if (!dl_data->dcch3_disc_request AND (dl_data->cch[C_DCCH3].vtx EQ RR_CMD))
+        {
+          dl_data->dcch3_disc_request = TRUE;
+        }
+        else
+        {
+          com_prepare_DISC (C_DCCH3, release_req->sapi);
+        }
+        break;
+
+      case STATE_AWAITING_RELEASE:
+        dl_data->cch[C_DCCH3].T200_counter = 0;
+        break;
+    }
+  }
+
+  if (bFree EQ FALSE)
+  {
+    PREUSE (release_req, release_cnf, DL_RELEASE_CNF);
+    release_cnf->indication =
+      com_queue_awaiting_transmission (PS_SAPI_3) ? DL_UNSERVED : DL_ALL_DONE;
+    PSENDX (RR, release_cnf);
+    dcch3_init_dl_data ();
+  }
+
+  return bFree;
+}
+
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DCCH3                   |
+| STATE   : code                ROUTINE : dcch3_mdl_release_req     |
++--------------------------------------------------------------------+
+
+  PURPOSE : Release Request from Mobility Management for SDCCH (SAPI 3).
+
+*/
+
+GLOBAL void dcch3_mdl_release_req (void)
+{
+  GET_INSTANCE_DATA;
+  TRACE_FUNCTION ("dcch3_mdl_release_req()");
+
+  DL_OFFLINE_TRACE (TRACE_DL_EVENT, C_DCCH3, dl_data->cch[C_DCCH3].ch_type, "mdl rel req");
+
+  switch (dl_data->state[C_DCCH3])
+  {
+    case STATE_AWAITING_ESTABLISHMENT:
+    case STATE_TIMER_RECOVERY:
+    case STATE_AWAITING_RELEASE:
+      drr_dl_release_cnf (dl_data->cch[C_DCCH3].ch_type, PS_SAPI_3, TRUE);
+      break;
+
+    case STATE_MULTIPLE_FRAME_ESTABLISHED:
+      drr_dl_release_ind (dl_data->cch[C_DCCH3].ch_type, PS_SAPI_3, NOT_PRESENT_8BIT, TRUE);
+      break;
+
+    default:
+      break;
+  }
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DCCH3                   |
+| STATE   : code                ROUTINE : dcch3_data_req            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Data Request on SDCCH (SAPI 3).
+
+*/
+
+GLOBAL void dcch3_data_req (T_DL_DATA_REQ * data_req)
+{
+  GET_INSTANCE_DATA;
+  TRACE_FUNCTION ("dcch3_data_req()");
+
+  switch (dl_data->state[C_DCCH3])
+  {
+    case STATE_MULTIPLE_FRAME_ESTABLISHED:
+    case STATE_TIMER_RECOVERY:
+      com_store_queue (PS_SAPI_3, data_req);
+      break;
+
+    default:
+      COM_FREE_POINTER (data_req);
+      break;
+  }
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_SDCCH                   |
+| STATE   : code                ROUTINE : dcch3_check_disc           |
++--------------------------------------------------------------------+
+
+  PURPOSE : DISC command frame on DCCH3.
+
+*/
+
+GLOBAL int dcch3_check_disc (int send)
+{
+  GET_INSTANCE_DATA;
+  TRACE_FUNCTION ("dcch3_check_disc()");
+
+  if (dl_data->dcch3_disc_request AND !(dl_data->cch[C_DCCH3].vtx EQ RR_CMD))
+  {
+    com_prepare_DISC (C_DCCH3, PS_SAPI_3);
+    return uplink_awaiting_release (C_DCCH3, PS_SAPI_3);
+  }
+  else
+    return send;
+}
+#endif /* DL_DCCH3_C */
+