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/*
* start-arm.c
*
* Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <common.h>
#include <init.h>
#include <asm/barebox-arm.h>
#include <asm/barebox-arm-head.h>
#include <asm-generic/memory_layout.h>
#include <asm/sections.h>
#include <asm/cache.h>
#ifdef CONFIG_PBL_IMAGE
/*
* First function in the pbl image. We get here from
* the pbl.
*/
void __naked __section(.text_entry) start(void)
{
u32 r;
/* Setup the stack */
r = STACK_BASE + STACK_SIZE - 16;
__asm__ __volatile__("mov sp, %0" : : "r"(r));
/* clear bss */
memset(__bss_start, 0, __bss_stop - __bss_start);
start_barebox();
}
#else
void __naked __section(.text_entry) start(void)
{
barebox_arm_head();
}
/*
* Board code can jump here by either returning from board_init_lowlevel
* or by calling this function directly.
*/
void __naked __section(.text_ll_return) board_init_lowlevel_return(void)
{
uint32_t r, addr, offset;
/*
* Get runtime address of this function. Do not
* put any code above this.
*/
__asm__ __volatile__("1: adr %0, 1b":"=r"(addr));
/* Setup the stack */
r = STACK_BASE + STACK_SIZE - 16;
__asm__ __volatile__("mov sp, %0" : : "r"(r));
/* Get offset between linked address and runtime address */
offset = (uint32_t)__ll_return - addr;
/* relocate to link address if necessary */
if (offset)
memcpy((void *)_text, (void *)(_text - offset),
__bss_start - _text);
/* clear bss */
memset(__bss_start, 0, __bss_stop - __bss_start);
flush_icache();
/* call start_barebox with its absolute address */
r = (unsigned int)&start_barebox;
__asm__ __volatile__("mov pc, %0" : : "r"(r));
}
#endif
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