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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_dcm.val                                                      |
| SOURCE  : "sap\dcm.pdf"                                                  |
| LastModified : "2003-09-03"                                              |
| IdAndVersion : "8462.101.03.001"                                         |
| SrcFileTime  : "Thu Nov 29 09:39:32 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_DCM_VAL
#define P_DCM_VAL


#define CDG_ENTER__P_DCM_VAL

#define CDG_ENTER__FILENAME _P_DCM_VAL
#define CDG_ENTER__P_DCM_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_DCM_VAL__LAST_MODIFIED _2003_09_03
#define CDG_ENTER__P_DCM_VAL__ID_AND_VERSION _8462_101_03_001

#define CDG_ENTER__P_DCM_VAL__SRC_FILE_TIME _Thu_Nov_29_09_39_32_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_DCM_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_bearer_select
 */
#define DCM_SOCK_BEARER_ANY            (0x1)      /* DCM will decide which connection type to be used */
#define DCM_SOCK_BEARER_GPRS           (0x2)      /* Use a GPRS context as bearer, DCM will decide which GPRS settings to be used */
#define DCM_SOCK_BEARER_GSM            (0x3)      /* Use GSM data connection as bearer DCM will decide which GSM settings to be used */
#define DCM_SOCK_BEARER_USE_PROFILE    (0x4)      /* Use a specific data account for this connection */
#define DCM_SOCK_BEARER_AS_SPECIFIED   (0x5)      /* Use the data account information which is which is delivered within this signal */

/*
 * Value constants for VAL_authtype
 */
#define DCM_SOCK_AUTH_PAP              (0x1)      /* PAP authentification protocol  */
#define DCM_SOCK_AUTH_CHAP             (0x2)      /* CHAP authentification protocol !!! NOT SUPPORTED */
#define DCM_SOCK_AUTH_NO               (0x3)      /* No authentication              */

/*
 * Value constants for VAL_result
 */
#define DCM_RET_OK                     (0x0)      /* The action has been performed successfully. */
#define DCM_RET_NOT_READY              (0x1)      /* The command can not be processed now. */
#define DCM_RET_ALREADY_ACTIVATED      (0x2)      /* Connection refused because already actuvated. */
#define DCM_RET_UNKNOWN_EVENT          (0x3)      /* Unknown receipt event.         */
#define DCM_RET_INVALID_PARAMETER      (0x4)      /* A parameter is wrong.          */
#define DCM_RET_CMD_PENDING            (0x5)      /* There is a pending command yet. */
#define DCM_RET_PS_CONN_BROKEN         (0x6)      /* Loose of bearer connection.    */

/*
 * user defined constants
 */
#define CDCM_APN_MAX_LEN               (0x64)     
#define CDCM_PHONE_NR_LEN              (0x54)     
#define CDCM_PDP_MAX_LEN               (0x14)     
#define CDCM_GATE_MAX_LEN              (0x14)     
#define CDCM_USER_MAX_LEN              (0x19)     
#define CDCM_PASSWORD_MAX_LEN          (0x19)     
#define CDCM_DNS_MAX_LEN               (0x14)     

#include "CDG_LEAVE.h"


#endif