FreeCalypso > hg > fc-tourmaline
view src/g23m-aci/aci/cmh_pps.c @ 220:0ed36de51973
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 |
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/* +----------------------------------------------------------------------------- | Project : GSM-PS (6147) | Modul : CMH_PPPS +----------------------------------------------------------------------------- | 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 : This module provides the set functions related to the | protocol stack adapter for the PPP module. +----------------------------------------------------------------------------- */ #ifdef DTI #if defined(FF_WAP) || defined(FF_PPP) || defined(FF_GPF_TCPIP) || defined(FF_SAT_E) #ifndef CMH_PPPS_C #define CMH_PPPS_C #endif #include "aci_all.h" /*==== INCLUDES ===================================================*/ #include "aci_cmh.h" #include "ati_cmd.h" #include "aci_cmd.h" #ifdef FAX_AND_DATA #include "aci_fd.h" #endif #include "ksd.h" #include "dti.h" /* functionality of the dti library */ #include "dti_conn_mng.h" #include "psa.h" #include "psa_sim.h" #include "psa_sms.h" #include "wap_aci.h" #include "psa_ppp_w.h" #include "phb.h" #include "cmh.h" #include "cmh_phb.h" #include "cmh_sms.h" /*==== CONSTANTS ==================================================*/ /*==== TYPES ======================================================*/ /*==== EXPORT =====================================================*/ /*==== VARIABLES ==================================================*/ /*==== FUNCTIONS ==================================================*/ /* +-------------------------------------------------------------------+ | PROJECT : GSM-PS (6147) MODULE : CMH_PPPS | | STATE : code ROUTINE : sAT_PercentPPP | +-------------------------------------------------------------------+ PURPOSE : This command will be called from MMI to set the authentification protocol, the login name, and the password for the PPP entity. */ GLOBAL T_ACI_RETURN sAT_PercentPPP ( T_ACI_CMD_SRC srcId, T_ACI_PPP_PROT protocol, CHAR *login, CHAR *pwd, T_ACI_PPP_CON con_type ) { switch (protocol) { case(A_NO_AUTH): pppShrdPrm.auth_prot = (T_ACI_PPP_PROT)PPP_AP_NO; break; case(A_PAP): pppShrdPrm.auth_prot = (T_ACI_PPP_PROT)PPP_AP_PAP; break; case(A_CHAP): pppShrdPrm.auth_prot = (T_ACI_PPP_PROT)PPP_AP_CHAP; break; case(A_AUTO_AUTH): pppShrdPrm.auth_prot = (T_ACI_PPP_PROT)PPP_AP_AUTO; break; default: TRACE_EVENT("Wrong value for authentification protocol"); return AT_FAIL; } #ifdef FF_PPP switch (con_type) { case(USE_NO_PPP_FOR_AAA): pppShrdPrm.is_PPP_CALL = FALSE; break; case(USE_PPP_FOR_AAA): pppShrdPrm.is_PPP_CALL = TRUE; break; default: TRACE_EVENT("Wrong value for connection type"); return AT_FAIL; } #endif /* FF_PPP */ if((login NEQ NULL) AND (pwd NEQ NULL)) { memcpy(pppShrdPrm.ppp_login,login, sizeof(pppShrdPrm.ppp_login)); memcpy(pppShrdPrm.ppp_password,pwd, sizeof(pppShrdPrm.ppp_password)); } else return AT_FAIL; return AT_CMPL; } #ifdef DTI /** Functional interface to the AT%PPP? command. The IP addresses are in host * byte order. * * @param srcId ID of command source (unused). * @param ipaddr_p Pointer to IP address variable of caller. * @param dns1_p Pointer to dns1 variable of caller. * @param dns2_p Pointer to dns2 variable of caller. * @return AT_CMPL */ GLOBAL T_ACI_RETURN qAT_PercentPPP(UBYTE srcId, ULONG *ipaddr_p, ULONG *dns1_p, ULONG *dns2_p) { if (ipaddr_p NEQ NULL) { *ipaddr_p = pppShrdPrm.ipaddr ; } if (dns1_p NEQ NULL) { *dns1_p = pppShrdPrm.dns1 ; } if (dns2_p NEQ NULL) { *dns2_p = pppShrdPrm.dns2 ; } return AT_CMPL ; } #endif /* DTI */ /* +-------------------------------------------------------------------+ | PROJECT : GSM-PS (6147) MODULE : CMH_PPPS | | STATE : code ROUTINE : cmhPPP_Terminate | +-------------------------------------------------------------------+ PURPOSE : */ GLOBAL T_ACI_RETURN cmhPPP_Terminate ( T_ACI_PPP_LOWER_LAYER ppp_lower_layer ) { TRACE_FUNCTION("cmhPPP_Terminate()"); psaPPP_Terminate(ppp_lower_layer); return (AT_CMPL); } #endif /* defined(WAP) || defined(FF_PPP) || defined(FF_GPF_TCPIP) || defined (FF_SAT_E) */ #endif /* DTI */