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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 /* Release the specified DMA tag from exclusive use. Once released, the
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28 tag is available for future reservation. Upon sucessful release,
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29 MFC_DMA_TAG_VALID is returned. If the specified tag is not in the
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30 range 0 to 31, or had not been reserved, no action is taken and
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31 MFC_DMA_TAG_INVALID is returned. */
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32
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33 unsigned int
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34 __mfc_tag_release (unsigned int tag)
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35 {
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36 vector unsigned int is_invalid;
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37 vector unsigned int mask = (vector unsigned int)
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38 { 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
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39 vector signed int zero = (vector signed int) { 0, 0, 0, 0 };
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40
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41 vector signed int has_been_reserved;
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42
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43 /* Check if the tag is out of range. */
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44 is_invalid = spu_cmpgt (spu_promote (tag, 0), 31);
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45
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46 /* Check whether the tag has been reserved, set to all 1 if has not
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47 been reserved, 0 otherwise. */
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48 has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag);
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49 has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved);
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50
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51 /* Set invalid. */
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52 is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid);
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53
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54 mask = spu_rlmask (mask, (int)(-tag));
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55 __mfc_tag_table = spu_or (__mfc_tag_table, mask);
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56
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57 return spu_extract(is_invalid, 0);
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58 }
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59
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