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/*
* start-pbl.c
*
* Copyright (c) 2010-2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
* Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* 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.
*
*/
#include <common.h>
#include <init.h>
#include <linux/sizes.h>
#include <pbl.h>
#include <asm/barebox-arm.h>
#include <asm/barebox-arm-head.h>
#include <asm-generic/memory_layout.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/cache.h>
#include "mmu-early.h"
unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
/*
* First instructions in the pbl image
*/
void __naked __section(.text_head_entry) pbl_start(void)
{
barebox_arm_head();
}
extern void *input_data;
extern void *input_data_end;
static noinline __noreturn void __barebox_arm_entry(unsigned long membase,
unsigned long memsize, void *boarddata)
{
uint32_t offset;
uint32_t pg_start, pg_end, pg_len;
void __noreturn (*barebox)(unsigned long, unsigned long, void *);
uint32_t endmem = membase + memsize;
unsigned long barebox_base;
endmem -= STACK_SIZE; /* stack */
arm_early_mmu_cache_invalidate();
if (IS_ENABLED(CONFIG_PBL_RELOCATABLE))
relocate_to_current_adr();
/* Get offset between linked address and runtime address */
offset = get_runtime_offset();
pg_start = (uint32_t)&input_data - offset;
pg_end = (uint32_t)&input_data_end - offset;
pg_len = pg_end - pg_start;
if (IS_ENABLED(CONFIG_RELOCATABLE))
barebox_base = arm_barebox_image_place(membase + memsize);
else
barebox_base = TEXT_BASE;
if (offset && (IS_ENABLED(CONFIG_PBL_FORCE_PIGGYDATA_COPY) ||
region_overlap(pg_start, pg_len, barebox_base, pg_len * 4))) {
/*
* copy piggydata binary to its link address
*/
memcpy(&input_data, (void *)pg_start, pg_len);
pg_start = (uint32_t)&input_data;
}
setup_c();
if (IS_ENABLED(CONFIG_MMU_EARLY)) {
endmem &= ~0x3fff;
endmem -= SZ_16K; /* ttb */
mmu_early_enable(membase, memsize, endmem);
}
endmem -= SZ_128K; /* early malloc */
free_mem_ptr = endmem;
free_mem_end_ptr = free_mem_ptr + SZ_128K;
pbl_barebox_uncompress((void*)barebox_base, (void *)pg_start, pg_len);
arm_early_mmu_cache_flush();
flush_icache();
if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
barebox = (void *)(barebox_base + 1);
else
barebox = (void *)barebox_base;
barebox(membase, memsize, boarddata);
}
/*
* Main ARM entry point in the compressed image. Call this with the memory
* region you can spare for barebox. This doesn't necessarily have to be the
* full SDRAM. The currently running binary can be inside or outside of this
* region. TEXT_BASE can be inside or outside of this region. boarddata will
* be preserved and can be accessed later with barebox_arm_boarddata().
*
* -> membase + memsize
* STACK_SIZE - stack
* 16KiB, aligned to 16KiB - First level page table if early MMU support
* is enabled
* 128KiB - early memory space
* -> maximum end of barebox binary
*
* Usually a TEXT_BASE of 1MiB below your lowest possible end of memory should
* be fine.
*/
void __naked __noreturn barebox_arm_entry(unsigned long membase,
unsigned long memsize, void *boarddata)
{
arm_setup_stack(membase + memsize - 16);
__barebox_arm_entry(membase, memsize, boarddata);
}
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