/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT 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 of the License, or (at your option) any later version. ChibiOS/RT 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, see . */ /** * @file PPC/crt0.s * @brief Generic PowerPC startup file for ChibiOS/RT. * * @addtogroup PPC_CORE * @{ */ /** @cond never */ .section .text .align 2 .globl _boot_address _boot_address: /* * Stack setup. */ lis %r1, __ram_end__@h ori %r1, %r1, __ram_end__@l li %r0, 0 stwu %r0, -8(%r1) /* * IVPR initialization. */ lis %r4, __ivpr_base__@h mtIVPR %r4 /* * Small sections registers initialization. */ lis %r2, __sdata2_start__@h ori %r2, %r2, __sdata2_start__@l lis %r13, __sdata_start__@h ori %r13, %r13, __sdata_start__@l /* * Early initialization. */ bl __early_init /* * BSS clearing. */ lis %r4, __bss_start__@h ori %r4, %r4, __bss_start__@l lis %r5, __bss_end__@h ori %r5, %r5, __bss_end__@l li %r7, 0 .bssloop: cmpl cr0, %r4, %r5 bge cr0, .bssend stw %r7, 0(%r4) addi %r4, %r4, 4 b .bssloop .bssend: /* * DATA initialization. */ lis %r4, __romdata_start__@h ori %r4, %r4, __romdata_start__@l lis %r5, __data_start__@h ori %r5, %r5, __data_start__@l lis %r6, __data_end__@h ori %r6, %r6, __data_end__@l .dataloop: cmpl cr0, %r5, %r6 bge cr0, .dataend lwz %r7, 0(%r4) addi %r4, %r4, 4 stw %r7, 0(%r5) addi %r5, %r5, 4 b .dataloop .dataend: /* * Main program invocation. */ bl main b _main_exit_handler /* * Default main exit code, infinite loop. */ .weak _main_exit_handler .globl _main_exit_handler _main_exit_handler: forever: b forever /* * Default initialization code, none. */ .weak __early_init .globl __early_init __early_init: blr /** @endcond */ /** @} */