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view src/g23m-aci/aci/psa_gppp.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
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/* 
+----------------------------------------------------------------------------- 
|  Project :  
|  Modul   :  
+----------------------------------------------------------------------------- 
|  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 
|             Point-to-Point Protocol ( PPP ).
+----------------------------------------------------------------------------- 
*/ 

#if defined (GPRS) AND defined (DTI)

#ifndef PSA_GPPP_H
#define PSA_GPPP_H



/*==== CONSTANTS ==================================================*/
/* length is out of the SAP from PPP */
#define CHANNEL_NAME_LENGTH           6


/*==== TYPES ======================================================*/
typedef struct pppSetParm
{
  T_PPP_PDP_ACTIVATE_RES  *pdp_res; /* parameter for PDP context activation */
  T_PPP_PDP_ACTIVATE_REJ  *pdp_rej; /* parameter for PDP context activation failed */
  UBYTE   ppp_hc;                   /* 0, 1: header compression of PPP connection */
  UBYTE   msid;                     /* ... : max slot identifier */

} T_PPP_SET_PRM;

typedef struct pppShrdParm
{
  /* set parameter */
  UBYTE  owner;                     /* identifies the used set */
  T_PPP_SET_PRM setPrm[OWN_SRC_MAX];    /* possible sets */

  /* global set parameter */
  UBYTE   ppp_authentication_protocol;  /* PPP authentication protocol */
  UBYTE   accm;                         /* default:  0 */
  UBYTE   restart_timer;                /* default:  3 */
  UBYTE   max_configure;                /* default: 10 */
  UBYTE   max_terminate;                /* default:  2 */
  UBYTE   max_failure;                  /* default:  5 */

  /* answer parameter */
  T_PPP_ESTABLISH_CNF      est;     /* parameter from establishment */
  T_PPP_PDP_ACTIVATE_IND  *pdp;     /* parameter from PDP context */
  U16     ppp_cause;                /* 1 ... 111 cause of PPP termination */
  UBYTE   instance;                 /* future parameter for the PPP instance */
  UBYTE   tui;
  UBYTE   ppp_hc;                   /* 0, 1: header compression of PPP connection */
  UBYTE   msid;                     /* ... : max slot identifier */

} T_GPPP_SHRD_PRM;

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

EXTERN void  psaGPPP_Establish (  T_PPP_ESTABLISH_REQ *est_req );
EXTERN void  psaGPPP_PDP_Activate ( T_NAS_ip * ip, UBYTE *pco_buf, UBYTE pco_length, U8 nsapi);

EXTERN SHORT psaGPPP_PDP_Reject   ( void );
//needed ?? EXTERN SHORT psaGPPP_Modification ( void );

EXTERN void psaGPPP_Init ( UBYTE accm, UBYTE restart_timer, 
                           UBYTE max_configure, UBYTE max_terminate, UBYTE max_failure );


EXTERN void  psaGPPP_Terminate  ( UBYTE lower_layer );

EXTERN void psaGPPPS_Dti_Req         ( T_DTI_CONN_LINK_ID link_id, UBYTE peer );

EXTERN BOOL PPP_UART_connect_dti_cb  ( UBYTE dti_id, T_DTI_CONN_STATE result_type);


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

#ifdef PSA_GPPPF_C

GLOBAL T_GPPP_SHRD_PRM gpppShrdPrm;

#else

EXTERN T_GPPP_SHRD_PRM gpppShrdPrm;

#endif /* PSA_GPPPF_C */

#endif /* PSA_PPP_H */

#endif  /* GPRS */
/*==== EOF =======================================================*/