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/* Copyright (C) 2007-2019 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 successful 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);
}
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