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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [spu/] [mfc_tag_release.c] - Rev 378
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/* Copyright (C) 2007, 2009 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include <spu_mfcio.h> extern vector unsigned int __mfc_tag_table; /* Release the specified DMA tag from exclusive use. Once released, the tag is available for future reservation. Upon sucessful release, MFC_DMA_TAG_VALID is returned. If the specified tag is not in the range 0 to 31, or had not been reserved, no action is taken and MFC_DMA_TAG_INVALID is returned. */ unsigned int __mfc_tag_release (unsigned int tag) { vector unsigned int is_invalid; vector unsigned int mask = (vector unsigned int) { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }; vector signed int zero = (vector signed int) { 0, 0, 0, 0 }; vector signed int has_been_reserved; /* Check if the tag is out of range. */ is_invalid = spu_cmpgt (spu_promote (tag, 0), 31); /* Check whether the tag has been reserved, set to all 1 if has not been reserved, 0 otherwise. */ has_been_reserved = (vector signed int) spu_rl (__mfc_tag_table, tag); has_been_reserved = (vector signed int) spu_cmpgt (zero, has_been_reserved); /* Set invalid. */ is_invalid = spu_or ((vector unsigned int) has_been_reserved, is_invalid); mask = spu_rlmask (mask, (int)(-tag)); __mfc_tag_table = spu_or (__mfc_tag_table, mask); return spu_extract(is_invalid, 0); }
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