167 lines
4.3 KiB
C
167 lines
4.3 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 <sizes.h>
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#include <of.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/unaligned.h>
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#include <asm/cache.h>
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#include <memory.h>
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#include "mmu-early.h"
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unsigned long arm_stack_top;
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static unsigned long barebox_boarddata;
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/*
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* return the boarddata variable passed to barebox_arm_entry
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*/
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unsigned long barebox_arm_boarddata(void)
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{
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return barebox_boarddata;
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}
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static void *barebox_boot_dtb;
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void *barebox_arm_boot_dtb(void)
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{
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return barebox_boot_dtb;
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}
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static noinline __noreturn void __start(uint32_t membase, uint32_t memsize,
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uint32_t boarddata)
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{
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unsigned long endmem = membase + memsize;
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unsigned long malloc_start, malloc_end;
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if (IS_ENABLED(CONFIG_RELOCATABLE)) {
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unsigned long barebox_base = arm_barebox_image_place(endmem);
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relocate_to_adr(barebox_base);
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}
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setup_c();
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barebox_boarddata = boarddata;
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arm_stack_top = endmem;
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endmem -= STACK_SIZE; /* Stack */
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if (IS_ENABLED(CONFIG_MMU_EARLY)) {
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endmem &= ~0x3fff;
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endmem -= SZ_16K; /* ttb */
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if (IS_ENABLED(CONFIG_PBL_IMAGE)) {
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arm_set_cache_functions();
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} else {
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arm_early_mmu_cache_invalidate();
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mmu_early_enable(membase, memsize, endmem);
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}
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}
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/*
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* If boarddata is a pointer inside valid memory and contains a
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* FDT magic then use it as later to probe devices
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*/
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if (boarddata >= membase && boarddata < membase + memsize &&
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get_unaligned_be32((void *)boarddata) == FDT_MAGIC) {
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uint32_t totalsize = get_unaligned_be32((void *)boarddata + 4);
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endmem -= ALIGN(totalsize, 64);
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barebox_boot_dtb = (void *)endmem;
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memcpy(barebox_boot_dtb, (void *)boarddata, totalsize);
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}
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if ((unsigned long)_text > membase + memsize ||
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(unsigned long)_text < membase)
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/*
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* barebox is either outside SDRAM or in another
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* memory bank, so we can use the whole bank for
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* malloc.
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*/
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malloc_end = endmem;
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else
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malloc_end = (unsigned long)_text;
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/*
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* Maximum malloc space is the Kconfig value if given
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* or 64MB.
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*/
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if (MALLOC_SIZE > 0) {
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malloc_start = malloc_end - MALLOC_SIZE;
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if (malloc_start < membase)
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malloc_start = membase;
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} else {
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malloc_start = malloc_end - (malloc_end - membase) / 2;
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if (malloc_end - malloc_start > SZ_64M)
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malloc_start = malloc_end - SZ_64M;
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}
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mem_malloc_init((void *)malloc_start, (void *)malloc_end - 1);
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start_barebox();
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}
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#ifndef CONFIG_PBL_IMAGE
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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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* Main ARM entry point in the uncompressed image. Call this with the memory
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* region you can spare for barebox. This doesn't necessarily have to be the
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* full SDRAM. The currently running binary can be inside or outside of this
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* region. TEXT_BASE can be inside or outside of this region. boarddata will
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* be preserved and can be accessed later with barebox_arm_boarddata().
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*
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* -> membase + memsize
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* STACK_SIZE - stack
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* 16KiB, aligned to 16KiB - First level page table if early MMU support
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* is enabled
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* -> maximum end of barebox binary
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*
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* Usually a TEXT_BASE of 1MiB below your lowest possible end of memory should
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* be fine.
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*/
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void __naked __noreturn barebox_arm_entry(uint32_t membase, uint32_t memsize,
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uint32_t boarddata)
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{
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arm_setup_stack(membase + memsize - 16);
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arm_early_mmu_cache_invalidate();
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__start(membase, memsize, boarddata);
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}
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#else
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/*
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* First function in the uncompressed image. We get here from
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* the pbl. The stack already has been set up by the pbl.
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*/
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void __naked __section(.text_entry) start(uint32_t membase, uint32_t memsize,
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uint32_t boarddata)
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{
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__start(membase, memsize, boarddata);
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}
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#endif
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