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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
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/* 
+----------------------------------------------------------------------------- 
|  Project :  GSM-PS (6302)
|  Modul   :  CUS_SIM
+----------------------------------------------------------------------------- 
|  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 :  Custom dependent definitions for SIM application.
|             
|             Use this header for definitions to integrate the
|             protocol stack entity SS in your target system !
+----------------------------------------------------------------------------- 
*/ 

#ifndef CUS_SIM_H
#define CUS_SIM_H

/*==== CONSTANTS ==================================================*/
 /*
 * VSI_CALLER
 *
 * Description :  For multithread applications the constant VSI_CALLER
 *                must be defined to identify the calling thread of the
 *                VSI-Interface. This must be done correponding to the
 *                type of T_VSI_CALLER in VSI.H. The comma symbol is
 *                neccessary because the vsi-functions are called
 *                like this vsi_xxx (VSI_CALLER par2, par3 ...)
 */
#ifdef OPTION_MULTITHREAD
#define VSI_CALLER sim_handle,
#define VSI_CALLER_SINGLE sim_handle
#else
#define VSI_CALLER
#define VSI_CALLER_SINGLE
#endif

/*
 * TIMER_VALUES
 *
 * Description :  The constants define the timer values
 *                WIN32 in 50 milliseconds
 *                ARM in TDMA frames
 */

/*
 * all Values in milliseconds
 */
#define T_DETECT_VALUE         10000
#define THIRTY_SECONDS         29500
#define TIMER_LATENCY            100

/*
 * VERSION
 *
 * Description :  The constants define the type and the value
 *                of a version identification. The version
 *                is part of the monitor struct.
 */


#define T_VERSION   char
#define VERSION_SIM "SIM 2.0"



#endif