1/* Copyright (C) 2007-2019 Free Software Foundation, Inc.
2
3This file is part of GCC.
4
5GCC is free software; you can redistribute it and/or modify it under
6the terms of the GNU General Public License as published by the Free
7Software Foundation; either version 3, or (at your option) any later
8version.
9
10GCC is distributed in the hope that it will be useful, but WITHOUT ANY
11WARRANTY; without even the implied warranty of MERCHANTABILITY or
12FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13for more details.
14
15Under Section 7 of GPL version 3, you are granted additional
16permissions described in the GCC Runtime Library Exception, version
173.1, as published by the Free Software Foundation.
18
19You should have received a copy of the GNU General Public License and
20a copy of the GCC Runtime Library Exception along with this program;
21see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
22<http://www.gnu.org/licenses/>.  */
23
24#include <spu_mfcio.h>
25extern vector unsigned int __mfc_tag_table;
26
27/* Release the specified DMA tag from exclusive use.  Once released, the
28   tag is available for future reservation.  Upon successful release,
29   MFC_DMA_TAG_VALID is returned.  If the specified tag is not in the
30   range 0 to 31, or had not been reserved, no action is taken and
31   MFC_DMA_TAG_INVALID is returned.  */
32
33unsigned int
34__mfc_tag_release (unsigned int tag)
35{
36  vector unsigned int is_invalid;
37  vector unsigned int mask = (vector unsigned int)
38	{ 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
39  vector signed int zero = (vector signed int) { 0, 0, 0, 0 };
40
41  vector signed int has_been_reserved;
42
43  /* Check if the tag is out of range.  */
44  is_invalid = spu_cmpgt (spu_promote (tag, 0), 31);
45
46  /* Check whether the tag has been reserved, set to all 1 if has not
47     been reserved, 0 otherwise.  */
48  has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag);
49  has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved);
50
51  /* Set invalid.  */
52  is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid);
53
54  mask = spu_rlmask (mask, (int)(-tag));
55  __mfc_tag_table = spu_or (__mfc_tag_table, mask);
56
57  return spu_extract(is_invalid, 0);
58}
59
60