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/*
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 <http://www.gnu.org/licenses/>.
*/
/**
* @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 */
/** @} */
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