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352 giacomo 1
/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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1063 tullio 19
/*
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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352 giacomo 36
#include <ll/sys/types.h>
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#include <ll/stdlib.h>
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#include <kernel/func.h>
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#include <kernel/mem.h>
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#include <kernel/log.h>
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#include <types.h>
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#include <trace.h>
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#include <queues.h>
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#include <ll/i386/x-dos.h>
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/* this file implement a fixed queue, that is simply an array that
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is filled with the events until it is full. After that, all the other
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events are discarded. It uses the DOSFS Filesystem to write all the data
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This file is derived from the trcfixed.c file; I used a different file
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because including trcfixed.c in the executable would have implied the
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linking of all the filesystem...
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*/
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typedef struct TAGfixed_queue_t {
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  int         size;
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  int         index;
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  char        *filename;
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  int         uniq;
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  trc_event_t table[0];
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  /* Yes, 0!... the elements are allocated
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     in a dirty way into the kern_alloc into fixed_create */
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} dosfs_fixed_queue_t;
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/* This function simply return an event to fill (only if the fixed table
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is not yet full) */
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static trc_event_t *dosfs_fixed_get(dosfs_fixed_queue_t *queue)
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{
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  if (queue->index>=queue->size) return NULL;
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  return &queue->table[queue->index++];
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}
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/* since get returns the correct event address,
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the post function does nothing... */
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static int dosfs_fixed_post(dosfs_fixed_queue_t *queue)
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{
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  return 0;
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}
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static TRC_FIXED_PARMS defaultargs;
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static int once=0;
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static void dosfs_fixed_flush(void *arg);
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static int dosfs_fixed_create(trc_queue_t *queue, TRC_FIXED_PARMS *args)
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{
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  dosfs_fixed_queue_t *ptr;
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  /* initialize the default arguments for the fixed queue */
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  if (!once) {
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    /* well... this func is called when the system is not running! */
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    once=1;
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    trc_fixed_default_parms(defaultargs);
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  }
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  if (args==NULL) args=&defaultargs;
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  /* allocate the fixed queue data structure plus the array of events */
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  ptr=(dosfs_fixed_queue_t*)kern_alloc(sizeof(dosfs_fixed_queue_t)+
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                                 sizeof(trc_event_t)*(args->size+1));
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  if (ptr==NULL) return -1;
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  /* set the current queue pointers and data */
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  queue->get=(trc_event_t*(*)(void*))dosfs_fixed_get;
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  queue->post=(int(*)(void*))dosfs_fixed_post;
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  queue->data=ptr;
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  ptr->size=args->size;
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  ptr->index=0;
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  ptr->filename=args->filename;
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  /* prepare for shutdown ;-) */
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  sys_atrunlevel(dosfs_fixed_flush, (void *)ptr, RUNLEVEL_AFTER_EXIT);
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  return 0;
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}
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static void dosfs_fixed_flush(void *arg)
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{
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  DOS_FILE *f;
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  dosfs_fixed_queue_t *queue = (dosfs_fixed_queue_t *)arg;
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  char pathname[100]; /* it should be PATH_MAX, but we do not use the
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                         filesystem, so the symbol is not defined */
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  if (queue->filename==NULL) trc_create_name("fix",queue->uniq,pathname);
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  else trc_create_name(queue->filename,0,pathname);
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  printk(KERN_DEBUG "tracer flush index= %d pathname=%s\n",
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         queue->index, pathname);
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  f = DOS_fopen(pathname,"w");
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  DOS_fwrite(queue->table,1,queue->index*sizeof(trc_event_t),f);
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  DOS_fclose(f);
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}
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static int dosfs_fixed_activate(dosfs_fixed_queue_t *queue, int uniq)
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{
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  queue->uniq=uniq;
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  return 0;
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}
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static int dosfs_fixed_terminate(dosfs_fixed_queue_t *queue)
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{
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  return 0;
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}
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int trc_register_dosfs_fixed_queue(void)
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{
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  int res;
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  res=trc_register_queuetype(TRC_DOSFS_FIXED_QUEUE,
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                             (int(*)(trc_queue_t*,void*))dosfs_fixed_create,
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                             (int(*)(void*,int))dosfs_fixed_activate,
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                             (int(*)(void*))dosfs_fixed_terminate
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                             );
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  if (res!=0) printk(KERN_WARNING "can't register tracer DOSFS fixed queue");
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  return res;
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}