3 * Copyright 2007 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <gcell/spu/gc_delay.h>
23 #include <gcell/compiler.h>
30 do { // 20 clocks per iteration of the loop
31 asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
32 asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
33 asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
34 asm ("nop $127; nop $127");
39 gc_udelay(unsigned int usecs)
42 for (i = 0; i < usecs; i++)
47 gc_cdelay(unsigned int cpu_cycles)
49 if (cpu_cycles < 40) // roughly the amount of overhead
52 cpu_cycles >>= 2; // about 4 cycles / loop
54 while (cpu_cycles-- != 0){
55 asm ("nop $127"); // keeps compiler from removing the loop