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49 lines
1.5 KiB
49 lines
1.5 KiB
2 months ago
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/cm3/common.h>
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extern unsigned _etext_ram, _text_ram, _etext_rom;
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#define CREG_M4MEMMAP MMIO32((0x40043000U + 0x100))
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static void pre_main(void)
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{
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volatile unsigned *src, *dest;
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/* Copy the code from ROM to Real RAM (if enabled) */
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if ((&_etext_ram-&_text_ram) > 0) {
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src = &_etext_rom-(&_etext_ram-&_text_ram);
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/* Change Shadow memory to ROM (for Debug Purpose in case Boot
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* has not set correctly the M4MEMMAP because of debug)
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*/
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CREG_M4MEMMAP = (unsigned long)src;
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for (dest = &_text_ram; dest < &_etext_ram; ) {
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*dest++ = *src++;
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}
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/* Change Shadow memory to Real RAM */
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CREG_M4MEMMAP = (unsigned long)&_text_ram;
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/* Continue Execution in RAM */
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}
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}
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