FreeCalypso > hg > fc-tourmaline
view src/gpf/ccd/ccddata_ccdmtab.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 | 4e78acac3d88 |
| children |
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/* +----------------------------------------------------------------------------- | Project : | Modul : ccddata_ccdmtab.c +----------------------------------------------------------------------------- | 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 : Ccddata abstraction for use in lib/dll. The six tables | mvar, spare, calc, mcomp, melem, and mmtx, genererated by ccdgen | (in ccdmtab.cdg) are supplied as well as the table calcidx | (generated in an extra file). In addition, corresponding | functions deliver specified elements of the tables. For | mmtx the function must be used, because this three-dimesional | array cannot be declared as extern without knowing the constants | at compile time. +----------------------------------------------------------------------------- */ #include "typedefs.h" #include "mconst.cdg" #include "ccdtable.h" static const T_CCD_VarTabEntry ccddata_mvar [] = { #include "mvar.cdg" }; static const T_CCD_SpareTabEntry ccddata_spare [] = { #include "spare.cdg" }; static const T_CCD_CalcTabEntry ccddata_calc [] = { #include "calc.cdg" }; static const T_CCD_CompTabEntry ccddata_mcomp [] = { #include "mcomp.cdg" }; static const T_CCD_ElemTabEntry ccddata_melem [] = { #include "melem.cdg" }; static const USHORT ccddata_mmtx [MAX_MMTX_SIZE] = { #include "mmtxval.cdg" }; static const T_CCD_CalcIndex ccddata_calcidx [] = { #include "calcidx.cdg" }; const T_CCD_MTXIDX ccddata_mmtx_idx [] = { #include "mmtxidx.cdg" }; const T_CCD_CalcIndex* ccddata_get_calcidx (USHORT idx) { return &ccddata_calcidx[idx]; } const T_CCD_VarTabEntry* ccddata_get_mvar (USHORT idx) { return &ccddata_mvar[idx]; } const T_CCD_SpareTabEntry* ccddata_get_spare (USHORT idx) { return &ccddata_spare[idx]; } const T_CCD_CalcTabEntry* ccddata_get_calc (USHORT idx) { return &ccddata_calc[idx]; } const T_CCD_CompTabEntry* ccddata_get_mcomp (USHORT idx) { return &ccddata_mcomp[idx]; } const T_CCD_ElemTabEntry* ccddata_get_melem (USHORT idx) { return &ccddata_melem[idx]; } USHORT ccddata_get_mmtx (USHORT entity, USHORT msgid, USHORT index) { if ((entity >= NUM_OF_ENTITIES) || (msgid >= ccddata_mmtx_idx[entity].numitems)) return NO_REF; return ccddata_mmtx[2*(ccddata_mmtx_idx[entity].idx + msgid) + index]; }
