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view src/g23m-gprs/gmm/gmm_kernl.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   :  gmm_kernl.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 gmm_kernl.c 
+----------------------------------------------------------------------------- 
*/ 


#ifndef GMM_KERNL_H
#define GMM_KERNL_H



/*EXTERN void kern_enter_reg_no_cell ( void );*/
EXTERN void kern_enter_reg_limited ( void );
EXTERN void kern_enter_reg_normal ( void );
EXTERN void kern_enter_reg_normal_upon_gmmrr_cell_ind ( void );

EXTERN void kern_err_cause ( USHORT error_cause, BOOL det_acc_sent );

EXTERN void kern_attach ( void );


EXTERN void kern_detach ( void );


EXTERN void kern_rau ( void );
EXTERN void kern_norm_rau ( void );
EXTERN void kern_comb_rau ( void );
EXTERN void kern_rau_init ( void );
EXTERN void kern_periodic_rau ( void );

EXTERN void kern_rau_limited ( void );

EXTERN void kern_aac ( USHORT cause );

EXTERN void kern_l_sim_rem_der ( void );
EXTERN void kern_l_sim_rem_reg ( void );
EXTERN void kern_l_sim_rem_reg_lim ( void );

EXTERN void kern_enter_der ( void );

EXTERN void kern_rau_complete ( UBYTE result_value );

EXTERN void kern_attach_accept
( 
  T_result_gmm                 * result,
  T_force_to_standby           * force_to_standby,
  T_rau_timer                  * rau_timer,
  /* attach: radio_priority */
  T_routing_area_identification *routing_area_identification,
  BOOL                           v_p_tmsi_signature,
  T_p_tmsi_signature           * p_tmsi_signature,
  BOOL                           v_ready_timer,
  T_ready_timer                * ready_timer,
  BOOL                           v_gmobile_identity,
  T_gmobile_identity           * gmobile_identity,
  BOOL                           v_mobile_identity,
  T_mobile_identity            * mobile_identity,
  /*
   * only RAU
   */
  BOOL                           v_receive_n_pdu_number_list,
  T_receive_n_pdu_number_list  * receive_n_pdu_number_list,
  USHORT                         cause,
  BOOL                           v_eqv_plmn_list, /* TCS 2.1 */
  T_eqv_plmn_list              * eqv_plmn_list, /* TCS 2.1 */
  BOOL                           v_t3302,
  T_t3302                      * t3302,
  BOOL                           v_cell_notification
);

EXTERN void kern_imsi_detach_reg_susp ( void );
EXTERN void kern_imsi_detach_der_susp ( void );
EXTERN void kern_enter_reg_no_cell_limited ( void );
EXTERN void kern_enter_reg_no_cell_susp ( void );
EXTERN void kern_enter_reg_limited_susp ( void );
EXTERN void kern_rau_susp ( void );
EXTERN void kern_enter_reg_normal_susp ( void );
EXTERN void kern_resume_grr_der ( void );
EXTERN void kern_resume_grr_reg ( void );
#endif /* !GMM_KERNL_H */