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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
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;********************************************************************************
;*** File           : tst.mdf
;*** Creation       : Thu Jun 19 15:32:14 CST 2008
;*** XSLT Processor : Apache Software Foundation / http://xml.apache.org/xalan-j / supports XSLT-Ver: 1
;*** Copyright      : (c) Texas Instruments AG, Berlin Germany 2002
;********************************************************************************
;*** Document Type  : Air Interface Message Specification
;*** Document Name  : tst
;*** Document No.   : 8441.603.99.005
;*** Document Date  : 2000-10-23
;*** Document Status: BEING_PROCESSED
;*** Document Author: ANS
;********************************************************************************



PRAGMA 	SRC_FILE_TIME 	"Wed Nov 28 10:21:30 2007"
PRAGMA 	LAST_MODIFIED 	"2000-10-23"
PRAGMA 	ID_AND_VERSION 	"8441.603.99.005"



CONST 	L3MAX 	251 	; maximum size of a L3 buffer
CONST 	MAX_N_PDU_NUMBER_LIST 	11 	; maximum size of N-PDU number list



VALTAB 	VAL_no_of_pdus
VAL 	DEF 	 	"Number of PDUs to transmit"
VAL 	0 	TEST_INFINITIVE_NO 	"ciphering not used"

VALTAB 	VAL_dl_timeslot_offset
VAL 	0 	TEST_TN0 	"downlink timeslot offsett 0"
VAL 	1 	TEST_TN1 	"downlink timeslot offsett 1"
VAL 	2 	TEST_TN2 	"downlink timeslot offsett 2"
VAL 	3 	TEST_TN3 	"downlink timeslot offsett 3"
VAL 	4 	TEST_TN4 	"downlink timeslot offsett 4"
VAL 	5 	TEST_TN5 	"downlink timeslot offsett 5"
VAL 	6 	TEST_TN6 	"downlink timeslot offsett 6"
VAL 	7 	TEST_TN7 	"downlink timeslot offsett 7"

VALTAB 	VAL_mode_flag_val
VAL 	0 	TEST_RANDOM 	"pseudorandom data"
VAL 	1 	TEST_LOOP 	"loop back"




VAR 	msg_type 	"Message Type" 	
 	8


VAR 	no_of_pdus 	"Number of PDUs" 	
 	12

VAL 	@m_tst - VAL_no_of_pdus@ 	

VAR 	dl_timeslot_offset 	"Downlink Timeslot Offset" 	
 	3

VAL 	@m_tst - VAL_dl_timeslot_offset@ 	

VAR 	mode_flag_val 	"Mode Flag Value" 	
 	1

VAL 	@m_tst - VAL_mode_flag_val@ 	




COMP 	pdu_description 	"PDU Description"
{
 	.000  ; spare
 	 	no_of_pdus 	 ; Number
}



COMP 	pdu_description_ie 	"PDU Description IE"
{
 	CSN1_S1  	pdu_description 	 ; PDU Description
}



COMP 	mode_flag 	"Mode Flag"
{
 	.0000  ; spare
 	 	dl_timeslot_offset 	 ; Downlink Timeslot Offset
 	 	mode_flag_val 	 ; Mode Flag Value
}






MSG 	gprs_test_mode_cmd 	downlink 	36 ; gprs_test_mode_cmd
{
 	GSM3_V  	msg_type 	 ; Message Type
 	GSM3_V  	pdu_description_ie 	 ; PDU description
 	GSM3_V  	mode_flag 	 ; Mode Flag
}