186 lines
4.6 KiB
C
186 lines
4.6 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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.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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/*
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* The actual reset vector. This code is position independent and usually
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* does not run at the address it's linked at.
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*/
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#ifndef CONFIG_MACH_DO_LOWLEVEL_INIT
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void __naked __bare_init reset(void)
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{
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common_reset();
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board_init_lowlevel_return();
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}
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#endif
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extern void *input_data;
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extern void *input_data_end;
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static unsigned long *ttb;
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static void create_sections(unsigned long addr, int size_m, unsigned int flags)
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{
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int i;
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addr >>= 20;
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for (i = size_m; i > 0; i--, addr++)
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ttb[addr] = (addr << 20) | flags;
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}
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static void map_cachable(unsigned long start, unsigned long size)
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{
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start &= ~(SZ_1M - 1);
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size = (size + (SZ_1M - 1)) & ~(SZ_1M - 1);
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create_sections(start, size >> 20, PMD_SECT_AP_WRITE |
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PMD_SECT_AP_READ | PMD_TYPE_SECT | PMD_SECT_WB);
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}
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static void mmu_enable(unsigned long compressed_start, unsigned int len)
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{
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int i;
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/* Set the ttb register */
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asm volatile ("mcr p15,0,%0,c2,c0,0" : : "r"(ttb) /*:*/);
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/* Set the Domain Access Control Register */
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i = 0x3;
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asm volatile ("mcr p15,0,%0,c3,c0,0" : : "r"(i) /*:*/);
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create_sections(0, 4096, PMD_SECT_AP_WRITE |
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PMD_SECT_AP_READ | PMD_TYPE_SECT);
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/*
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* Setup all regions we need cacheable, namely:
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* - the stack
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* - the decompressor code
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* - the compressed image
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* - the uncompressed image
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* - the early malloc space
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*/
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map_cachable(STACK_BASE, STACK_SIZE);
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map_cachable((unsigned long)&_text,
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(unsigned long)&_end - (unsigned long)&_text);
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map_cachable((unsigned long)compressed_start, len);
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map_cachable(TEXT_BASE, len * 4);
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map_cachable(free_mem_ptr, free_mem_end_ptr - free_mem_ptr);
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__mmu_cache_on();
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}
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static void mmu_disable(void)
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{
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__mmu_cache_flush();
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__mmu_cache_off();
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}
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static void barebox_uncompress(void *compressed_start, unsigned int len)
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{
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void (*barebox)(void);
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/*
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* remap_cached currently does not work rendering the feature
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* of enabling the MMU in the PBL useless. disable for now.
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*/
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int use_mmu = 0;
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/* set 128 KiB at the end of the MALLOC_BASE for early malloc */
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free_mem_ptr = MALLOC_BASE + MALLOC_SIZE - SZ_128K;
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free_mem_end_ptr = free_mem_ptr + SZ_128K;
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ttb = (void *)((free_mem_ptr - 0x4000) & ~0x3fff);
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if (use_mmu)
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mmu_enable((unsigned long)compressed_start, len);
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if (IS_ENABLED(CONFIG_THUMB2_BAREBOX))
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barebox = (void *)(TEXT_BASE + 1);
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else
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barebox = (void *)TEXT_BASE;
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pbl_barebox_uncompress((void*)TEXT_BASE, compressed_start, len);
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if (use_mmu)
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mmu_disable();
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flush_icache();
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barebox();
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}
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/*
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* Board code can jump here by either returning from board_init_lowlevel
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* or by calling this function directly.
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*/
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void __naked board_init_lowlevel_return(void)
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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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/* Setup the stack */
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arm_setup_stack(STACK_BASE + STACK_SIZE - 16);
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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 (offset && (IS_ENABLED(CONFIG_PBL_FORCE_PIGGYDATA_COPY) ||
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region_overlap(pg_start, pg_len, TEXT_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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barebox_uncompress((void *)pg_start, pg_len);
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}
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