/* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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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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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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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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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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Software Foundation; either version 3, or (at your option) any later
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version.
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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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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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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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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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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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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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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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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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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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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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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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#include <spu_mfcio.h>
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#include <spu_mfcio.h>
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extern vector unsigned int __mfc_tag_table;
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extern vector unsigned int __mfc_tag_table;
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/* Reserves a DMA tag for exclusive use. This routine returns an available
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/* Reserves a DMA tag for exclusive use. This routine returns an available
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tag id in the range 0 to 31 and marks the tag as reserved. If no tags
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tag id in the range 0 to 31 and marks the tag as reserved. If no tags
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are available, MFC_DMA_TAG_INVALID is returned indicating that all tags
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are available, MFC_DMA_TAG_INVALID is returned indicating that all tags
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are already reserved. */
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are already reserved. */
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unsigned int
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unsigned int
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__mfc_tag_reserve (void)
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__mfc_tag_reserve (void)
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{
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{
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vector unsigned int mask = (vector unsigned int)
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vector unsigned int mask = (vector unsigned int)
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{ 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
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{ 0x80000000, 0x80000000, 0x80000000, 0x80000000 };
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vector unsigned int count_zeros, is_valid;
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vector unsigned int count_zeros, is_valid;
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vector signed int count_neg;
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vector signed int count_neg;
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count_zeros = spu_cntlz (__mfc_tag_table);
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count_zeros = spu_cntlz (__mfc_tag_table);
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count_neg = spu_sub (0, (vector signed int) count_zeros);
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count_neg = spu_sub (0, (vector signed int) count_zeros);
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mask = spu_rlmask (mask, (vector signed int) count_neg);
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mask = spu_rlmask (mask, (vector signed int) count_neg);
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__mfc_tag_table = spu_andc (__mfc_tag_table, mask);
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__mfc_tag_table = spu_andc (__mfc_tag_table, mask);
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is_valid = spu_cmpeq (count_zeros, 32);
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is_valid = spu_cmpeq (count_zeros, 32);
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count_zeros = spu_sel (count_zeros, is_valid, is_valid);
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count_zeros = spu_sel (count_zeros, is_valid, is_valid);
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return spu_extract (count_zeros, 0);
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return spu_extract (count_zeros, 0);
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}
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}
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