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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    : p_dti.val                                                      |
| SOURCE  : "sap\dti.pdf"                                                  |
| LastModified : "2000-06-29"                                              |
| IdAndVersion : "8411.110.00.007"                                         |
| SrcFileTime  : "Thu Nov 29 09:40:22 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 P_DTI_VAL
#define P_DTI_VAL


#define CDG_ENTER__P_DTI_VAL

#define CDG_ENTER__FILENAME _P_DTI_VAL
#define CDG_ENTER__P_DTI_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_DTI_VAL__LAST_MODIFIED _2000_06_29
#define CDG_ENTER__P_DTI_VAL__ID_AND_VERSION _8411_110_00_007

#define CDG_ENTER__P_DTI_VAL__SRC_FILE_TIME _Thu_Nov_29_09_40_22_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_DTI_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_c_id
 */
#define DTI_NSAPI_0                    (0x0)      /* escape mechanism for future extensions */
#define DTI_NSAPI_1                    (0x1)      /* Point-To-Multipoint Multicast information */
#define DTI_NSAPI_2                    (0x2)      /* reserved for future use        */
#define DTI_NSAPI_3                    (0x3)      /* reserved for future use        */
#define DTI_NSAPI_4                    (0x4)      /* reserved for future use        */
#define DTI_NSAPI_5                    (0x5)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_6                    (0x6)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_7                    (0x7)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_8                    (0x8)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_9                    (0x9)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_10                   (0xa)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_11                   (0xb)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_12                   (0xc)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_13                   (0xd)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_14                   (0xe)      /* dynamically allocated NSAPI value */
#define DTI_NSAPI_15                   (0xf)      /* dynamically allocated NSAPI value */
#define DTI_C_ID_DEFAULT               (0x5)      /* Default value for c_id         */

/*
 * Value constants for VAL_p_id
 */
#define DTI_PID_IP                     (0x21)     /* simple ip packet               */
#define DTI_PID_CTCP                   (0x2d)     /* Van Jacobson compressed TCP/IP header */
#define DTI_PID_UTCP                   (0x2f)     /* Van Jacobson uncompressed TCP/IP header */
#define DTI_PID_FRAME                  (0x0)      /* PPP frame                      */

/*
 * Value constants for VAL_op_ack
 */
#define OP_ACK                         (0x1)      /* acknowledged operation mode    */
#define OP_UNACK                       (0x0)      /* unacknowledged operation mode  */

/*
 * Value constants for VAL_st_flow
 */
#define DTI_FLOW_ON                    (0x0)      /* flow control is inactive       */
#define DTI_FLOW_OFF                   (0x1)      /* flow control is active         */

/*
 * Value constants for VAL_st_line_sa
 */
#define DTI_SA_ON                      (0x0)      /* SA is inactive                 */
#define DTI_SA_OFF                     (0x1)      /* SA is active                   */

/*
 * Value constants for VAL_st_line_sb
 */
#define DTI_SB_ON                      (0x0)      /* SB is inactive                 */
#define DTI_SB_OFF                     (0x1)      /* SB is active                   */

/*
 * Value constants for VAL_st_escape
 */
#define DTI_ESC_OFF                    (0x0)      /* No escape detected             */
#define DTI_ESC_ON                     (0x1)      /* Escape detected                */

#include "CDG_LEAVE.h"


#endif