URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [spu/] [mfc_tag_reserve.c] - Rev 283
Go to most recent revision | Compare with Previous | Blame | View Log
/* 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; /* Reserves a DMA tag for exclusive use. This routine returns an available tag id in the range 0 to 31 and marks the tag as reserved. If no tags are available, MFC_DMA_TAG_INVALID is returned indicating that all tags are already reserved. */ unsigned int __mfc_tag_reserve (void) { vector unsigned int mask = (vector unsigned int) { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }; vector unsigned int count_zeros, is_valid; vector signed int count_neg; count_zeros = spu_cntlz (__mfc_tag_table); count_neg = spu_sub (0, (vector signed int) count_zeros); mask = spu_rlmask (mask, (vector signed int) count_neg); __mfc_tag_table = spu_andc (__mfc_tag_table, mask); is_valid = spu_cmpeq (count_zeros, 32); count_zeros = spu_sel (count_zeros, is_valid, is_valid); return spu_extract (count_zeros, 0); }
Go to most recent revision | Compare with Previous | Blame | View Log