/* Copyright (C) 2007, 2009 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include <spu_mfcio.h>
extern vector unsigned int __mfc_tag_table;

/* Release a sequential group of tags from exclusive use. The sequential
   group of tags is the range starting from <first_tag> through
   <first_tag>+<number_of_tags>-1. Upon sucessful release, MFC_DMA_TAG_VALID
   is returned and the tags become available for future reservation.

   If the specified tags were not previously reserved, no action is
   taken and MFC_DMA_TAG_INVALID is returned.  */

unsigned int
__mfc_multi_tag_release (unsigned int first_tag, unsigned int number_of_tags)
{
  vector unsigned int table_copy, tmp, tmp1;
  vector unsigned int one = (vector unsigned int)
        { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
  vector unsigned int is_invalid;
  unsigned int last_tag;
  vector unsigned int has_been_reserved;

  last_tag = first_tag + number_of_tags;

  table_copy = spu_sl (one, number_of_tags);
  table_copy = spu_rl (table_copy, -last_tag);
  table_copy = spu_xor (table_copy, -1);

  /* Make sure the tags are in range and valid.  */
  tmp = spu_cmpgt (spu_promote(last_tag, 0), 32);
  tmp1 = spu_cmpgt (spu_promote(number_of_tags, 0), 32);
  is_invalid =  spu_cmpgt (spu_promote(first_tag, 0), 31);

  /* All bits are set to 1 if invalid, 0 if valid.  */
  is_invalid = spu_or (tmp, is_invalid);
  is_invalid = spu_or (tmp1, is_invalid);

  /* check whether these tags have been reserved */
  tmp = spu_rlmask (one, (int)-number_of_tags);
  tmp1 = spu_sl (__mfc_tag_table, first_tag);
  has_been_reserved = spu_cmpgt(tmp1, tmp);

  is_invalid = spu_or (has_been_reserved, is_invalid);

  table_copy = spu_sel (__mfc_tag_table, table_copy, table_copy);
  __mfc_tag_table = spu_sel (table_copy, __mfc_tag_table, is_invalid);

  return spu_extract (is_invalid, 0);
}

