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/* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <spu_mfcio.h>
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extern vector unsigned int __mfc_tag_table;
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/* Release the specified DMA tag from exclusive use. Once released, the
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tag is available for future reservation. Upon sucessful release,
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MFC_DMA_TAG_VALID is returned. If the specified tag is not in the
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range 0 to 31, or had not been reserved, no action is taken and
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MFC_DMA_TAG_INVALID is returned. */
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unsigned int
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__mfc_tag_release (unsigned int tag)
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{
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vector unsigned int is_invalid;
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vector unsigned int mask = (vector unsigned int)
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{ 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
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vector signed int zero = (vector signed int) { 0, 0, 0, 0 };
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vector signed int has_been_reserved;
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/* Check if the tag is out of range. */
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is_invalid = spu_cmpgt (spu_promote (tag, 0), 31);
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/* Check whether the tag has been reserved, set to all 1 if has not
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been reserved, 0 otherwise. */
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has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag);
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has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved);
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/* Set invalid. */
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is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid);
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mask = spu_rlmask (mask, (int)(-tag));
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__mfc_tag_table = spu_or (__mfc_tag_table, mask);
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return spu_extract(is_invalid, 0);
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}
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