/***************************************************************************
 *
 * Copyright (C) 2001 International Business Machines
 * All rights reserved.
 *
 * This file is part of the GPFS mmfslinux kernel module.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer. 
 *  2. Redistributions in binary form must reproduce the above copyright 
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written
 *     permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *************************************************************************** */
/* @(#)27       1.5  src/avs/fs/mmfs/ts/kernext/gpl-linux/ppc64/ss_ppc64.c, mmfs, avs_rgpfs24, rgpfs240610b 9/15/04 23:29:27 */

/*
 * Implementation of shared segment for GPFS daemon and GPFS kernel code.
 *
*/

#include <Shark-gpl.h>
#include <cxiSystem.h>
#include <cxiSharedSeg.h>

#include <linux/types.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>
#if LINUX_KERNEL_VERSION < 2060000
#include <linux/compatmac.h>
#endif

#include <verdep.h>

int
kxSaveThreadInfo(int tid, void* regP)
{
  struct task_struct *g, *t;
  int rc = ENOENT;
  unsigned long sp;

  read_lock(&tasklist_lock);
  DO_EACH_THREAD(g,t)
  {
    if (t->pid != tid)
      continue;

    rc = 0;
    goto found_it;
  } WHILE_EACH_THREAD(g,t);
found_it:
  read_unlock(&tasklist_lock);
  if (rc == 0)
  {
    if (t->thread.regs != NULL)
      copy_to_user(regP, t->thread.regs, sizeof(struct pt_regs));
    else
    {
#if LINUX_KERNEL_VERSION < 2060000
      sp = (unsigned long)t + sizeof(union task_union);
#else
      /* ??? */
      sp = (unsigned long)t->thread_info + THREAD_SIZE;
#endif
      sp -= sizeof(struct pt_regs);
      copy_to_user(regP, (void*)sp, sizeof(struct pt_regs));
    }
  }
  return rc;
}