FreeCalypso > hg > fc-tourmaline
view src/gpf/inc/pco_util.h @ 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 : PCO2 | Modul : PCO_UTIL +----------------------------------------------------------------------------- | 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 Modul provides utillity functions for pco +----------------------------------------------------------------------------- */ #ifndef _PCO_UTIL_H_ #define _PCO_UTIL_H_ /*==== INCLUDES ===================================================*/ #include <stdio.h> #include "ipcapi.h" #undef EXPORT #include "typedefs.h" /*==== TYPES ======================================================*/ /*==== CONSTANTS ==================================================*/ #define ZERO_COMPRESS_MIN 8 /*==== EXTERNALS ==================================================*/ /*==== VARIABLES ==================================================*/ /*==== PROTOTYPES =================================================*/ /* +--------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : get_path | +--------------------------------------------------------------------+ PURPOSE : Retrieves the pathname from a path/filename(path\filenames)-string. PARAMS: fname ... path/filename path ... retrieved path string slash ... 1 -> '/'s are used as separators. 0 -> '\'s are used as separators */ void get_path(const char* fname, char* path, int slash=1); /* +------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : read_string | +------------------------------------------------------+ PURPOSE : Reads one line from a text file. PARAMS: stream ... stream to read from buf ... buffer to read into max_len ... maximum length of line to read into buf RETURNS: 0 ... no error -1 ... buffer to small */ int read_string (FILE * stream, char * buf, int max_len); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : send_ipcmsg | +-------------------------------------------------------------------------------+ PURPOSE : tries to send a message with ipc header to a receiver PARAMS: buf ... pointer to buffer size .. size of buffer id ... message id sender .. queuename of sender receiver .. queuename of receiver RETURNS: 0 .. sucess -1 .. receiver not found -2 .. error while contacting receiver */ int send_ipcmsg(void* buf, U16 size, U16 id, const char* sender, const char* receiver); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : send_ipcmsg | +-------------------------------------------------------------------------------+ PURPOSE : tries to send a message with ipc header to a receiver PARAMS: buf ... pointer to buffer size .. size of buffer id ... message id sender .. queuename of sender receiver .. queuename of receiver rqueue ... handle of receiver queue RETURNS: 0 .. sucess -1 .. error while contacting receiver */ int send_ipcmsg(void* buf, U16 size, U16 id, const char* sender, const char* receiver, CMS_HANDLE rqueue); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_VIEW_STD | | STATE : code ROUTINE : create_hexdump | +-------------------------------------------------------------------------------+ PURPOSE : creates hexdump string of given data PARAMS: data .. the data dsize .. size of data dump .. buffer to receive hexdump size .. size of dump reverse.. if !=0 the hexdump will represent the reverse data buffer zero_compress_min .. count of zeros from which on compression will be applied RETURNS: 0 .. success -1 .. dump buffer to small */ int create_hexdump(const void *data, unsigned dsize, char *dump, unsigned size, int reverse=0, int zero_compress_min=ZERO_COMPRESS_MIN); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : interprete_hexdump | +-------------------------------------------------------------------------------+ PURPOSE : tries to interprete a given string hexdump-like Example: 00 44 (23*00) 47 11 PARAMS: dump .. string containing hexdump buffer .. buffer to receive interpreted data bsize .. size of buffer count .. count of bytes writen to buffer RETURNS: 0 .. success -1 .. buffer to small -2 .. invalid hexdump */ int interprete_hexdump(const char *dump, void* buffer, unsigned bsize, unsigned& count); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : get_time_hmsm | +-------------------------------------------------------------------------------+ PURPOSE : calculates the current time in ms (hour, minute, second and ms are taken into account) RETURNS: current time in milliseconds */ ULONG get_time_hmsm(); /* +-------------------------------------------------------------------------------+ | PROJECT : PCO2 MODULE : PCO_UTIL | | STATE : code ROUTINE : get_dll_size | +-------------------------------------------------------------------------------+ PURPOSE : calculates the actual count of bytes used in a given DLL-file PARAMS: dll_fname .. name of dll-file RETURNS: count of bytes used, 0 if file is no WIN32-DLL */ ULONG get_dll_size(const char* dll_fname); #endif /* _PCO_UTIL_H_ */