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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.
*
* 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 <sizes.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.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();
}
/*
* The actual reset vector. This code is position independent and usually
* does not run at the address it's linked at.
*/
#ifndef CONFIG_MACH_DO_LOWLEVEL_INIT
void __naked __bare_init reset(void)
{
common_reset();
board_init_lowlevel_return();
}
#endif
extern void *input_data;
extern void *input_data_end;
#define STATIC static
#ifdef CONFIG_IMAGE_COMPRESSION_LZO
#include "../../../lib/decompress_unlzo.c"
#endif
#ifdef CONFIG_IMAGE_COMPRESSION_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif
static unsigned long *ttb;
static void create_sections(unsigned long addr, int size_m, unsigned int flags)
{
int i;
addr >>= 20;
for (i = size_m; i > 0; i--, addr++)
ttb[addr] = (addr << 20) | flags;
}
static void map_cachable(unsigned long start, unsigned long size)
{
start &= ~(SZ_1M - 1);
size = (size + (SZ_1M - 1)) & ~(SZ_1M - 1);
create_sections(start, size >> 20, PMD_SECT_AP_WRITE |
PMD_SECT_AP_READ | PMD_TYPE_SECT | PMD_SECT_WB);
}
static void mmu_enable(unsigned long compressed_start, unsigned int len)
{
int i;
/* Set the ttb register */
asm volatile ("mcr p15,0,%0,c2,c0,0" : : "r"(ttb) /*:*/);
/* Set the Domain Access Control Register */
i = 0x3;
asm volatile ("mcr p15,0,%0,c3,c0,0" : : "r"(i) /*:*/);
create_sections(0, 4096, PMD_SECT_AP_WRITE |
PMD_SECT_AP_READ | PMD_TYPE_SECT);
/*
* Setup all regions we need cacheable, namely:
* - the stack
* - the decompressor code
* - the compressed image
* - the uncompressed image
* - the early malloc space
*/
map_cachable(STACK_BASE, STACK_SIZE);
map_cachable((unsigned long)&_text,
(unsigned long)&_end - (unsigned long)&_text);
map_cachable((unsigned long)compressed_start, len);
map_cachable(TEXT_BASE, len * 4);
map_cachable(free_mem_ptr, free_mem_end_ptr - free_mem_ptr);
__mmu_cache_on();
}
static void mmu_disable(void)
{
__mmu_cache_flush();
__mmu_cache_off();
}
void noinline errorfn(char *error)
{
while (1);
}
static void barebox_uncompress(void *compressed_start, unsigned int len)
{
void (*barebox)(void);
/*
* remap_cached currently does not work rendering the feature
* of enabling the MMU in the PBL useless. disable for now.
*/
int use_mmu = 0;
/* set 128 KiB at the end of the MALLOC_BASE for early malloc */
free_mem_ptr = MALLOC_BASE + MALLOC_SIZE - SZ_128K;
free_mem_end_ptr = free_mem_ptr + SZ_128K;
ttb = (void *)((free_mem_ptr - 0x4000) & ~0x3fff);
if (use_mmu)
mmu_enable((unsigned long)compressed_start, len);
if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
barebox = (void *)(TEXT_BASE + 1);
else
barebox = (void *)TEXT_BASE;
decompress((void *)compressed_start,
len,
NULL, NULL,
(void *)TEXT_BASE, NULL, errorfn);
if (use_mmu)
mmu_disable();
flush_icache();
barebox();
}
/*
* Board code can jump here by either returning from board_init_lowlevel
* or by calling this function directly.
*/
void __naked board_init_lowlevel_return(void)
{
uint32_t r, offset;
uint32_t pg_start, pg_end, pg_len;
/* 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 = 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_PBL_FORCE_PIGGYDATA_COPY))
goto copy_piggy_link;
/*
* Check if the piggydata binary will be overwritten
* by the uncompressed binary or by the pbl relocation
*/
if (!offset ||
!((pg_start >= TEXT_BASE && pg_start < TEXT_BASE + pg_len * 4) ||
((uint32_t)_text >= pg_start && (uint32_t)_text <= pg_end)))
goto copy_link;
copy_piggy_link:
/*
* copy piggydata binary to its link address
*/
memcpy(&input_data, (void *)pg_start, pg_len);
pg_start = (uint32_t)&input_data;
copy_link:
/* 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();
r = (unsigned int)&barebox_uncompress;
/* call barebox_uncompress with its absolute address */
__asm__ __volatile__(
"mov r0, %1\n"
"mov r1, %2\n"
"mov pc, %0\n"
:
: "r"(r), "r"(pg_start), "r"(pg_len)
: "r0", "r1");
}
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