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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 :  GSM-PS (6147)
|  Modul   :  PSA_T30
+----------------------------------------------------------------------------- 
|  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 the protocol stack adapter T30
+----------------------------------------------------------------------------- 
*/ 

#ifndef PSA_T30_H
#define PSA_T30_H

#ifdef FF_FAX

#define REPORT_MAX    128
#define MSG_SIZE_BITS 2880

/*==== CONSTANTS ==================================================*/

typedef enum
{
  NO_VLD_FS = 0,                  /* not a valid fax status */
  FS_IDL,                         /* fax idle */
  FS_SND_DOC,                     /* sending fax document */
  FS_RCV_DOC,                     /* receiving fax document */
  FS_DOC_TRF                      /* fax document transfered */
} T_T30_FXST;

/*==== TYPES ======================================================*/

typedef struct
{
  UBYTE        dir;
  USHORT       l_buf;
  UBYTE        buf[REPORT_MAX];
} T_Report;

typedef struct T30ShrdParm
{
  SHORT         cId;              /* related call id */
  UBYTE         faxStat;          /* status of fax */
  USHORT        trans_rate;       /* t30_activate_req, t30_modify_req */
  UBYTE         half_rate;        /* t30_activate_req, t30_modify_req */
  UBYTE         threshold;        /* t30_activate_req */
  UBYTE         bitord;           /* t30_activate_req */
  USHORT        frames_per_prim;  /* t30_activate_req */
  USHORT        tbs;              /* t30_activate_cnf */
  USHORT        rbs;              /* t30_activate_cnf */
  T_hdlc_info   hdlc_rcv;         /* t30_cap_ind, t30_cap_req */
  T_hdlc_info   hdlc_snd;         /* t30_cap_ind, t30_cap_req */
  UBYTE         sgn_rcv;          /* t30_sgn_ind */
  UBYTE         sgn_snd;          /* t30_sgn_req */
  UBYTE         cmpl;             /* t30_cmpl_ind */
  UBYTE         hdlc_report;      /* t30_config_req */
  U16           test_mode;        /* t30_config_req */
  USHORT        err_cause;        /* t30_error_ind */
  USHORT        eol;              /* t30_info_ind */
  T_Report      report;           /* t30_report_ind */
  UBYTE         bcs_phase;        /* ks */
  UBYTE         msg_phase;
  BOOL          T30_is_activated;
} T_T30_SHRD_PRM;

typedef struct T30TstPrmRef
{
  const char * key;               /* keyword string */
  UBYTE  id;                      /* corresponding id */
} T30_TSTPRM_REF;

/*==== PROTOTYPES =================================================*/

EXTERN SHORT psaT30_Ppm          (void);

#ifdef DTI
EXTERN void psaT30_Dti_Req    (T_DTI_CONN_LINK_ID link_id, UBYTE dti_conn);
#endif /* DTI */

#ifdef FF_FAX
EXTERN void  psaT30_Init         (void);
#endif

EXTERN SHORT psaT30_Ppm       (void);
EXTERN void  psaT30_Modify       (void);
EXTERN void  psaT30_Disconnect   (void);
EXTERN void  psaT30_Config       (void);
EXTERN void  psaT30_Capabilities (void);
EXTERN void  psaT30_Activate     (void);
EXTERN void  psaT30_Deactivate   (void);

#ifdef TRACING
EXTERN void psaT30_shrPrmDump ( void );
#endif

/*==== EXPORT =====================================================*/

#ifdef PSA_T30F_C

GLOBAL T_T30_SHRD_PRM t30ShrdPrm;

#else

EXTERN T_T30_SHRD_PRM t30ShrdPrm;

#endif /* PSA_T30F_C */

#endif /* FF_FAX */

#endif /* PSA_T30_H */

/*==== EOF =======================================================*/