/* crt0.S - Startup code for the PowerPC. */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. * * This program 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 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ .extern __bss_start .extern _end .text .align 2 .globl _start _start: li 2, 0 li 13, 0 /* Stage1 won't zero BSS for us. In other cases, why not do it again? */ lis 6, (__bss_start - 4)@h ori 6, 6, (__bss_start - 4)@l lis 7, (_end - 4)@h ori 7, 7, (_end - 4)@l subf 7, 6, 7 srwi 7, 7, 2 /* We store 4 bytes at a time. */ mtctr 7 2: stwu 2, 4(6) /* We know r2 is already 0 from above. */ bdnz 2b bl cmain 1: b 1b