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/*
* uncompress.c - uncompressor code for self extracing pbl image
*
* Copyright (c) 2010-2013 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.
*
*/
#define pr_fmt(fmt) "uncompress.c: " fmt
#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/secure.h>
#include <asm/cache.h>
#include <asm/mmu.h>
#include <asm/unaligned.h>
#include <debug_ll.h>
#include "entry.h"
#ifndef CONFIG_HAVE_PBL_MULTI_IMAGES
void start_pbl(void);
/*
* First instructions in the pbl image
*/
void __naked __section(.text_head_entry_start_single_pbl) start_pbl(void)
{
barebox_arm_head();
}
#endif
unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
extern unsigned char input_data[];
extern unsigned char input_data_end[];
void __noreturn barebox_pbl_start(unsigned long membase, unsigned long memsize,
void *boarddata)
{
uint32_t pg_len, uncompressed_len;
void __noreturn (*barebox)(unsigned long, unsigned long, void *);
unsigned long endmem = membase + memsize;
unsigned long barebox_base;
void *pg_start, *pg_end;
unsigned long pc = get_pc();
pg_start = input_data + global_variable_offset();
pg_end = input_data_end + global_variable_offset();
if (IS_ENABLED(CONFIG_PBL_RELOCATABLE)) {
/*
* If we run from inside the memory just relocate the binary
* to the current address. Otherwise it may be a readonly location.
* Copy and relocate to the start of the memory in this case.
*/
if (pc > membase && pc - membase < memsize)
relocate_to_current_adr();
else
relocate_to_adr(membase);
}
pg_len = pg_end - pg_start;
uncompressed_len = get_unaligned((const u32 *)(pg_start + pg_len - 4));
if (IS_ENABLED(CONFIG_RELOCATABLE))
barebox_base = arm_mem_barebox_image(membase, endmem,
uncompressed_len + MAX_BSS_SIZE);
else
barebox_base = TEXT_BASE;
setup_c();
pr_debug("memory at 0x%08lx, size 0x%08lx\n", membase, memsize);
if (IS_ENABLED(CONFIG_MMU_EARLY)) {
unsigned long ttb = arm_mem_ttb(membase, endmem);
pr_debug("enabling MMU, ttb @ 0x%08lx\n", ttb);
mmu_early_enable(membase, memsize, ttb);
}
free_mem_ptr = arm_mem_early_malloc(membase, endmem);
free_mem_end_ptr = arm_mem_early_malloc_end(membase, endmem);
pr_debug("uncompressing barebox binary at 0x%p (size 0x%08x) to 0x%08lx (uncompressed size: 0x%08x)\n",
pg_start, pg_len, barebox_base, uncompressed_len);
pbl_barebox_uncompress((void*)barebox_base, pg_start, pg_len);
sync_caches_for_execution();
if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
barebox = (void *)(barebox_base + 1);
else
barebox = (void *)barebox_base;
pr_debug("jumping to uncompressed image at 0x%p\n", barebox);
if (IS_ENABLED(CONFIG_CPU_V7) && boot_cpu_mode() == HYP_MODE)
armv7_switch_to_hyp();
barebox(membase, memsize, boarddata);
}
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