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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_mdl.val                                                      |
| SOURCE  : "sap\mdl.pdf"                                                  |
| LastModified : "2002-04-19"                                              |
| IdAndVersion : "6147.111.97.101"                                         |
| SrcFileTime  : "Thu Nov 29 09:45:46 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_MDL_VAL
#define P_MDL_VAL


#define CDG_ENTER__P_MDL_VAL

#define CDG_ENTER__FILENAME _P_MDL_VAL
#define CDG_ENTER__P_MDL_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_MDL_VAL__LAST_MODIFIED _2002_04_19
#define CDG_ENTER__P_MDL_VAL__ID_AND_VERSION _6147_111_97_101

#define CDG_ENTER__P_MDL_VAL__SRC_FILE_TIME _Thu_Nov_29_09_45_46_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_MDL_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_ch_type
 */
#define CH_TYPE_SACCH                  (0x0)      /* SACCH                          */
#define CH_TYPE_SDCCH                  (0x1)      /* SDCCH                          */
#define CH_TYPE_FACCH                  (0x2)      /* FACCH                          */
#define CH_TYPE_BCCH                   (0x3)      /* BCCH                           */
#define CH_TYPE_CCCH                   (0x4)      /* CCCH                           */
#define CH_TYPE_RACH                   (0x5)      /* RACH                           */
#define CH_TYPE_NBR_CEL_BCCH           (0x6)      /* Neighbour Cell BCCH            */

/*
 * Value constants for VAL_sapi
 */
#define SAPI_0                         (0x0)      /* SAPI 0                         */
#define SAPI_3                         (0x3)      /* SAPI 3                         */

/*
 * Value constants for VAL_cs
 */
#define CS_T200_EXP                    (0x0)      /* T200 expired (N200 + 1 times)  */
#define CS_REEST_REQ                   (0x1)      /* re-establishment request       */
#define CS_UNSOL_UA_RESP               (0x2)      /* unsolicited UA response        */
#define CS_UNSOL_DM_RESP               (0x3)      /* unsolicited DM response        */
#define CS_UNSOL_DM_RESP_MULT_FRM      (0x4)      /* unsolicited DM response, multiple frame established state */
#define CS_UNSOL_SUP_RESP              (0x5)      /* unsolicited supervisory response */
#define CS_SEQ_ERR                     (0x6)      /* sequence error                 */
#define CS_UFRM_W_INC_PARA             (0x7)      /* U frame with incorrect parameters */
#define CS_SFRM_W_INC_PARA             (0x8)      /* S frame with incorrect parameters */
#define CS_IFRM_W_INC_MBIT             (0x9)      /* I frame with incorrect use of M bit */
#define CS_IFRM_W_INC_LEN              (0xa)      /* I frame with incorrect length  */
#define CS_FRM_NOT_IMPL                (0xb)      /* frame not implemented          */
#define CS_SABM_MULT_FRM               (0xc)      /* SABM command, multiple frame established state */
#define CS_SABM_NO_INFO                (0xd)      /* SABM command with information field not allowed in this state */
#define CS_NR_SEQ_ERR                  (0xe)      /* sequence error, perform abnormal release */

#include "CDG_LEAVE.h"


#endif