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view src/g23m-gprs/sndcp/sndcp_nup.h @ 220:0ed36de51973

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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
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/* 
+----------------------------------------------------------------------------- 
|  Project :  GPRS (8441)
|  Modul   :  sndcp_nup.h
+----------------------------------------------------------------------------- 
|  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 :  Definitions for sndcp_nup.c 
+----------------------------------------------------------------------------- 
*/ 

/*---- HISTORY --------------------------------------------------------------*/
#if 0

  $Log:: /GPRS/Condat/MS/SRC/SNDCP/sndcp_nup.h                             $
 * 
 * 22    15.05.00 16:55 Hk
 * T H E   E N D.
 * 
 * 21    15.05.00 16:16 Hk
 * backup.
 * 
 * 20    9.05.00 18:59 Hk
 * XID negotiation work in progress. Backup.
 * 
 * 19    18.04.00 18:47 Hk
 * Backup. Work on XID negotiation.
 * 
 * 18    30.03.00 16:04 Hk
 * 
 * 17    17.03.00 18:03 Hk
 * Acknowledged data transfer is now implemented and tested uplink and
 * downlink.
 * 
 * 16    10.03.00 17:48 Hk
 * Backup. First downlink ack data transfer ok (case 700).
 * 
 * 15    7.03.00 18:24 Hk
 * Backup. Last check in before adding extra downlink service for timeout and
 * re-ordering. 
 * 
 * 14    25.02.00 18:27 Hk
 * Backup, test case 346 runs (deactivation of ack context including ll
 * release.
 * 
 * 13    17.02.00 14:32 Hk
 * Last checkin before maybe splitting sd in two services for 1.unack and 2.
 * ack op mode.
 * 
 * 12    11.02.00 18:49 Hk
 * Establishment of LLC acknowledged operation mode. First test case SNDCP035
 * successful. Backup.
 * 
 * 11    9.02.00 15:02 Hk
 * Backup. Unacknowledged data transfer possible. Up to testcase SNDCP034.
 * 
 * 10    7.02.00 18:02 Hk
 * Backup, error situations in service sd, up to testcase 028.
 * 
 * 9     3.02.00 18:08 Hk
 * Backup, downlink transfer up to test case 016.
 * 
 * 8     26.01.00 16:24 Hk
 * Made services sd and nd compilable.
 * 
 * 7     13.01.00 18:07 Hk
 * Backup. Test case SNDCP008 successful.
 * 
 * 6     7.01.00 18:09 Hk
 * Backup. Data transfer in service su in case of LL_READY_IND, test case
 * SNDCP005.
 * 
 * 5     4.01.00 18:56 Hk
 * Work on uplink data transfer, test case SNDCP003 successful.
 * 
 * 4     30.12.99 17:16 Hk
 * Last backup before millennium crash. Continued work on service su, data
 * transfer.
 * 
 * 3     29.12.99 17:21 Hk
 * Started to rework service su, queue of inoming sn_nuitdata_req prims will
 * be designed in more detail in SDL.
 * 
 * 2     28.12.99 18:18 Hk
 * Added test primitives with sdu instead of desc_list and started work on
 * data transfer.
 * 
 * 1     28.12.99 13:07 Hk
 * Initial.

#endif

#ifndef SNDCP_NUP_H
#define SNDCP_NUP_H


EXTERN void nu_sn_data_req ( T_SN_DATA_REQ *sn_data_req );

EXTERN void nu_sn_unitdata_req ( T_SN_UNITDATA_REQ *sn_unitdata_req );

EXTERN void nu_connection_state(UBYTE nsapi, BOOL opened);

#endif /* !SNDCP_NUP_H */