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