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1 /* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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2
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3 This file is part of GCC.
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4
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5 GCC is free software; you can redistribute it and/or modify it under
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6 the terms of the GNU General Public License as published by the Free
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7 Software Foundation; either version 3, or (at your option) any later
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8 version.
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9
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10 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 for more details.
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14
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15 Under Section 7 of GPL version 3, you are granted additional
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16 permissions described in the GCC Runtime Library Exception, version
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17 3.1, as published by the Free Software Foundation.
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18
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19 You should have received a copy of the GNU General Public License and
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20 a copy of the GCC Runtime Library Exception along with this program;
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21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 <http://www.gnu.org/licenses/>. */
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23
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24 #include <spu_mfcio.h>
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25 extern vector unsigned int __mfc_tag_table;
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26
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27 /* Reserves a DMA tag for exclusive use. This routine returns an available
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28 tag id in the range 0 to 31 and marks the tag as reserved. If no tags
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29 are available, MFC_DMA_TAG_INVALID is returned indicating that all tags
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30 are already reserved. */
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31
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32 unsigned int
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33 __mfc_tag_reserve (void)
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34 {
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35 vector unsigned int mask = (vector unsigned int)
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36 { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
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37 vector unsigned int count_zeros, is_valid;
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38 vector signed int count_neg;
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39
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40 count_zeros = spu_cntlz (__mfc_tag_table);
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41 count_neg = spu_sub (0, (vector signed int) count_zeros);
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42
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43 mask = spu_rlmask (mask, (vector signed int) count_neg);
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44 __mfc_tag_table = spu_andc (__mfc_tag_table, mask);
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45
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46 is_valid = spu_cmpeq (count_zeros, 32);
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47 count_zeros = spu_sel (count_zeros, is_valid, is_valid);
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48
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49 return spu_extract (count_zeros, 0);
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50 }
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51
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