134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*
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* start-pbl.c
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*
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* Copyright (c) 2010-2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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* Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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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 <pbl.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/pgtable.h>
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#include <asm/cache.h>
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#include "mmu-early.h"
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unsigned long free_mem_ptr;
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unsigned long free_mem_end_ptr;
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/*
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* First instructions in the pbl image
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*/
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void __naked __section(.text_head_entry) pbl_start(void)
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{
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barebox_arm_head();
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}
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extern void *input_data;
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extern void *input_data_end;
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static noinline __noreturn void __barebox_arm_entry(unsigned long membase,
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unsigned long memsize, void *boarddata)
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{
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uint32_t offset;
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uint32_t pg_start, pg_end, pg_len;
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void __noreturn (*barebox)(unsigned long, unsigned long, void *);
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uint32_t endmem = membase + memsize;
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unsigned long barebox_base;
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endmem -= STACK_SIZE; /* stack */
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arm_early_mmu_cache_invalidate();
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if (IS_ENABLED(CONFIG_PBL_RELOCATABLE))
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relocate_to_current_adr();
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/* Get offset between linked address and runtime address */
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offset = get_runtime_offset();
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pg_start = (uint32_t)&input_data - offset;
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pg_end = (uint32_t)&input_data_end - offset;
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pg_len = pg_end - pg_start;
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if (IS_ENABLED(CONFIG_RELOCATABLE))
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barebox_base = arm_barebox_image_place(membase + memsize);
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else
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barebox_base = TEXT_BASE;
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if (offset && (IS_ENABLED(CONFIG_PBL_FORCE_PIGGYDATA_COPY) ||
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region_overlap(pg_start, pg_len, barebox_base, pg_len * 4))) {
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/*
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* copy piggydata binary to its link address
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*/
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memcpy(&input_data, (void *)pg_start, pg_len);
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pg_start = (uint32_t)&input_data;
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}
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setup_c();
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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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mmu_early_enable(membase, memsize, endmem);
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}
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endmem -= SZ_128K; /* early malloc */
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free_mem_ptr = endmem;
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free_mem_end_ptr = free_mem_ptr + SZ_128K;
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pbl_barebox_uncompress((void*)barebox_base, (void *)pg_start, pg_len);
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arm_early_mmu_cache_flush();
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flush_icache();
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if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
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barebox = (void *)(barebox_base + 1);
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else
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barebox = (void *)barebox_base;
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barebox(membase, memsize, boarddata);
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}
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/*
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* Main ARM entry point in the compressed 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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* 128KiB - early memory space
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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(unsigned long membase,
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unsigned long memsize, void *boarddata)
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{
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arm_setup_stack(membase + memsize - 16);
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__barebox_arm_entry(membase, memsize, boarddata);
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}
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