1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright (C) 2018-2019 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 int main (void) 19 { 20 /* Set Load Stream Disable bit in DSCR. */ 21 unsigned long dscr = 0x20; 22 23 /* This is the non-privileged SPR number to access DSCR, 24 available since isa 207. */ 25 asm volatile ("mtspr 3,%0" : : "r" (dscr)); 26 27 /* Set PPR to low priority (010 in bits 11:13, or 28 0x0008000000000000). */ 29 asm volatile ("or 1,1,1"); 30 asm volatile ("nop"); // marker 31 asm volatile ("nop"); 32 33 return 0; 34 } 35