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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 35f7a1dc9f7d
children
line wrap: on
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/*
+--------------------------------------------------------------------------+
| PROJECT : PROTOCOL STACK                                                 |
| FILE    : m_tst.val                                                      |
| SOURCE  : "msg\tst.mdf"                                                  |
| LastModified : "2000-10-23"                                              |
| IdAndVersion : "8441.603.99.005"                                         |
| SrcFileTime  : "Wed Nov 28 10:21:30 2007"                                |
| Generated by CCDGEN_2.5.5A on Fri Oct 14 21:41:52 2016                   |
|           !!DO NOT MODIFY!!DO NOT MODIFY!!DO NOT MODIFY!!                |
+--------------------------------------------------------------------------+
*/

/* PRAGMAS
 * PREFIX                 : NONE
 * COMPATIBILITY_DEFINES  : NO (require PREFIX)
 * ALWAYS_ENUM_IN_VAL_FILE: NO
 * ENABLE_GROUP: NO
 * CAPITALIZE_TYPENAME: NO
 */


#ifndef M_TST_VAL
#define M_TST_VAL


#define CDG_ENTER__M_TST_VAL

#define CDG_ENTER__FILENAME _M_TST_VAL
#define CDG_ENTER__M_TST_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__M_TST_VAL__LAST_MODIFIED _2000_10_23
#define CDG_ENTER__M_TST_VAL__ID_AND_VERSION _8441_603_99_005

#define CDG_ENTER__M_TST_VAL__SRC_FILE_TIME _Wed_Nov_28_10_21_30_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__M_TST_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_no_of_pdus
 */
#define VAL_NO_OF_PDUS___DEF           (0x0)      /* Number of PDUs to transmit     */
#define TEST_INFINITIVE_NO             (0x0)      /* ciphering not used             */

/*
 * Value constants for VAL_dl_timeslot_offset
 */
#define TEST_TN0                       (0x0)      /* downlink timeslot offsett 0    */
#define TEST_TN1                       (0x1)      /* downlink timeslot offsett 1    */
#define TEST_TN2                       (0x2)      /* downlink timeslot offsett 2    */
#define TEST_TN3                       (0x3)      /* downlink timeslot offsett 3    */
#define TEST_TN4                       (0x4)      /* downlink timeslot offsett 4    */
#define TEST_TN5                       (0x5)      /* downlink timeslot offsett 5    */
#define TEST_TN6                       (0x6)      /* downlink timeslot offsett 6    */
#define TEST_TN7                       (0x7)      /* downlink timeslot offsett 7    */

/*
 * Value constants for VAL_mode_flag_val
 */
#define TEST_RANDOM                    (0x0)      /* pseudorandom data              */
#define TEST_LOOP                      (0x1)      /* loop back                      */

/*
 * user defined constants
 */
#define L3MAX                          (0xfb)     
#define MAX_N_PDU_NUMBER_LIST          (0xb)      

#include "CDG_LEAVE.h"


#endif