97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
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* start-arm.c
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*
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* Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <asm/barebox-arm.h>
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#include <asm/barebox-arm-head.h>
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#include <asm-generic/memory_layout.h>
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#include <asm/sections.h>
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#include <asm/cache.h>
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#ifdef CONFIG_PBL_IMAGE
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/*
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* First function in the uncompressed image. We get here from
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* the pbl.
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*/
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void __naked __section(.text_entry) start(void)
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{
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u32 r;
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/* Setup the stack */
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r = STACK_BASE + STACK_SIZE - 16;
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__asm__ __volatile__("mov sp, %0" : : "r"(r));
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/* clear bss */
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memset(__bss_start, 0, __bss_stop - __bss_start);
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start_barebox();
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}
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#else
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/*
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* First function in the image without pbl support
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*/
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void __naked __section(.text_entry) start(void)
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{
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barebox_arm_head();
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}
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/*
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* The actual reset vector. This code is position independent and usually
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* does not run at the address it's linked at.
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*/
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#ifndef CONFIG_MACH_DO_LOWLEVEL_INIT
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void __naked __bare_init reset(void)
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{
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common_reset();
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board_init_lowlevel_return();
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}
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#endif
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/*
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* Board code can jump here by either returning from board_init_lowlevel
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* or by calling this function directly.
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*/
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void __naked board_init_lowlevel_return(void)
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{
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uint32_t r, offset;
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/* Setup the stack */
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r = STACK_BASE + STACK_SIZE - 16;
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__asm__ __volatile__("mov sp, %0" : : "r"(r));
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/* Get offset between linked address and runtime address */
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offset = get_runtime_offset();
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/* relocate to link address if necessary */
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if (offset)
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memcpy((void *)_text, (void *)(_text - offset),
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__bss_start - _text);
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/* clear bss */
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memset(__bss_start, 0, __bss_stop - __bss_start);
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flush_icache();
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/* call start_barebox with its absolute address */
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r = (unsigned int)&start_barebox;
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__asm__ __volatile__("mov pc, %0" : : "r"(r));
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}
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#endif
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