| /* Copyright (C) 2007 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 2, or (at your option) any later |
| version. |
| |
| In addition to the permissions in the GNU General Public License, the |
| Free Software Foundation gives you unlimited permission to link the |
| compiled version of this file into combinations with other programs, |
| and to distribute those combinations without any restriction coming |
| from the use of this file. (The General Public License restrictions |
| do apply in other respects; for example, they cover modification of |
| the file, and distribution when not linked into a combine |
| executable.) |
| |
| 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING. If not, write to the Free |
| Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA. */ |
| |
| #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); |
| } |
| |