91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
|
|
* 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>
|
|
|
|
#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 I-cache before jumping to the copied binary */
|
|
__asm__ __volatile__("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
|
|
|
|
/* call start_barebox with its absolute address */
|
|
r = (unsigned int)&start_barebox;
|
|
__asm__ __volatile__("mov pc, %0" : : "r"(r));
|
|
}
|
|
#endif
|