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/* 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 the specified DMA tag from exclusive use.  Once released, the

   tag is available for future reservation.  Upon sucessful release,

   MFC_DMA_TAG_VALID is returned.  If the specified tag is not in the

   range 0 to 31, or had not been reserved, no action is taken and

   MFC_DMA_TAG_INVALID is returned.  */

unsigned int

__mfc_tag_release (unsigned int tag)

{

  vector unsigned int is_invalid;

  vector unsigned int mask = (vector unsigned int)

        { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };

  vector signed int zero = (vector signed int) { 0, 0, 0, 0 };

  vector signed int has_been_reserved;

  /* Check if the tag is out of range.  */

  is_invalid = spu_cmpgt (spu_promote (tag, 0), 31);

  /* Check whether the tag has been reserved, set to all 1 if has not

     been reserved, 0 otherwise.  */

  has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag);

  has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved);

  /* Set invalid.  */

  is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid);

  mask = spu_rlmask (mask, (int)(-tag));

  __mfc_tag_table = spu_or (__mfc_tag_table, mask);

  return spu_extract(is_invalid, 0);

}