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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-F&D (8411)
|  Modul   :  ACI_CMD
+----------------------------------------------------------------------------- 
|  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 AT Command Interpreter
+----------------------------------------------------------------------------- 
*/ 

#ifndef ACI_IO_H
#define ACI_IO_H


typedef enum {
    IO_DCD_OFF = 0,
    IO_DCD_ON
} T_IO_DCD_STAT;

typedef enum {
    IO_RING_OFF = 0,
    IO_RING_ON
} T_IO_RING_STAT;

typedef enum{
    ESC_DETECTION_OFF=0,
    ESC_DETECTION_ON
} T_IO_ESC_STAT;

typedef struct {
  T_IO_RING_STAT  ring_stat;
  UBYTE           b_cap_1;
  UBYTE           b_cap_2;
} T_IO_RING_PARAMS;


EXTERN void io_sendBreak    (
                              USHORT         brk_len
                            );

EXTERN void io_sendMessage  (
                              UBYTE             srcId,
                              char              *a,
                              T_ATI_OUTPUT_TYPE output_type
                            );

EXTERN void io_sendMessageEx (
                               UBYTE             srcId,
                               char              *a,
                               T_ATI_OUTPUT_TYPE output_type
                             );
#ifndef LOCOSTO_LITE_2_54_COMPILER_ERROR
EXTERN void io_sendIndication  (
                                 UBYTE             srcId,
                                 char              *a,
                                 T_ATI_OUTPUT_TYPE output_type
                               );
#endif


EXTERN void io_sendConfirm  (
                              UBYTE             srcId,
                              char              *a,
                              T_ATI_OUTPUT_TYPE output_type
                            );

EXTERN BOOL check_should_buffer_ind( T_ATI_SRC_PARAMS *src_params );
EXTERN void send_buffered_indication( T_ATI_SRC_PARAMS *src_params );

EXTERN void io_setRngInd (T_IO_RING_STAT state, T_ACI_CRING_SERV_TYP bt1, T_ACI_CRING_SERV_TYP bt2);

EXTERN void io_setDCD (T_ACI_CMD_SRC src_id, T_IO_DCD_STAT state);

EXTERN void io_setCommandState(T_ATI_SRC_PARAMS *src_params, T_ATI_LINE_STATE_TYPE line_state_type);

#endif