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f1717362 | 1 | /* Copyright (C) 2007-2016 Free Software Foundation, Inc. |
1ed5a748 | 2 | |
3 | This file is part of GCC. | |
4 | ||
5 | GCC is free software; you can redistribute it and/or modify it under | |
6 | the terms of the GNU General Public License as published by the Free | |
6bc9506f | 7 | Software Foundation; either version 3, or (at your option) any later |
1ed5a748 | 8 | version. |
9 | ||
1ed5a748 | 10 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | for more details. | |
14 | ||
6bc9506f | 15 | Under Section 7 of GPL version 3, you are granted additional |
16 | permissions described in the GCC Runtime Library Exception, version | |
17 | 3.1, as published by the Free Software Foundation. | |
18 | ||
19 | You should have received a copy of the GNU General Public License and | |
20 | a copy of the GCC Runtime Library Exception along with this program; | |
21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 | <http://www.gnu.org/licenses/>. */ | |
1ed5a748 | 23 | |
24 | #include <spu_mfcio.h> | |
25 | extern vector unsigned int __mfc_tag_table; | |
26 | ||
27 | /* Reserves a DMA tag for exclusive use. This routine returns an available | |
28 | tag id in the range 0 to 31 and marks the tag as reserved. If no tags | |
29 | are available, MFC_DMA_TAG_INVALID is returned indicating that all tags | |
30 | are already reserved. */ | |
31 | ||
32 | unsigned int | |
33 | __mfc_tag_reserve (void) | |
34 | { | |
35 | vector unsigned int mask = (vector unsigned int) | |
36 | { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }; | |
37 | vector unsigned int count_zeros, is_valid; | |
38 | vector signed int count_neg; | |
39 | ||
40 | count_zeros = spu_cntlz (__mfc_tag_table); | |
41 | count_neg = spu_sub (0, (vector signed int) count_zeros); | |
42 | ||
43 | mask = spu_rlmask (mask, (vector signed int) count_neg); | |
44 | __mfc_tag_table = spu_andc (__mfc_tag_table, mask); | |
45 | ||
46 | is_valid = spu_cmpeq (count_zeros, 32); | |
47 | count_zeros = spu_sel (count_zeros, is_valid, is_valid); | |
48 | ||
49 | return spu_extract (count_zeros, 0); | |
50 | } | |
51 |